(1) Groenendijk,J. (Jan) - Boomstra,R.P. (Roel)
World Title Match 2016, 03-12-2016


1.32-28 17-22 2.28x17 11x22 3.37-32 6-11 4.41-37 12-17 5.46-41 7-12 6.34-29 2-7 7.40-34 19-23 8.35-30 20-25 9.45-40 14-19 10.50-45 9-14 11.40-35 4-9 12.44-40 1-6 When seeing this strangeway of building the position for black with ...0914, ...0409 (it wasmuch more common to play ...1014, ...0510 for many years) it wasclear to me that Roel Boomstra had prepared something for thisoccasion. I only didn't know from where the idea came from. Now whenI checked the database, I understood the clue: Roel Boomstra'straining partner for this match is his Dutch club member WouterSipma. And checking the database for repetition of this positionbefore, I found out that Wouter Sipma has tried this with blackagainst Shwarzman in IMSA Mind Sport Games in Blitz discipline thisFebruary. The game of Sipma though was not a success, but there wasan untypical material to work with in future. 13.32-28
[ 13.31-27 22x31 14.36x27 14-20 15.30-24 19x30 16.35x24 17-22 17.41-36 22x31 18.36x27 11-17 19.49-44 17-21? (19...17-22! 20.37-31 6-11 and probably in this direction the two guys worked inpreparation for the match...) 20.33-28 and after exchange 2x2white managed to secure the center and win. ]
13...23x32 14.37x28 19-23 15.28x19 14x23 16.49-44
[ 16.30-24? is good, but it is a mirrage: black will not play on hislong wing, but will try to group on his short one... 17-21 17.31-26 (17.41-37 21-26 18.31-27 22x31 19.36x27 11-17 andblack just attacks white long wing, while white short wing is out ofthe game.) 17...22-27 18.26x17 11x22 advatage for black intempoes and position ]
16...22-28! I am sure that this move isstill a part of Boomstra's analyzed opening, since he played it fastenough, and besides it is logical when one knows for sure that thereis no pending danger. 17.33x22 17x28 18.41-37 16-21 Blackfaces simple, but effective plan: just to strengthen gradually hisposition on a short wing, and in case white tries to link his pieceswith those of black on a short wing with 3832, black will answer...1116, and white will always have to take care of ...1822combination. 19.38-32 11-16 20.31-27 White still manages tolink his pieces with those of the black, avoiding ...1822, stillwhite piece on 44 is a nuisance. 10-14 21.43-38 7-11 22.36-31
[ 22.38-33 12-17 23.33x22 17x28 24.42-38 (24.27-22 18x38 25.42x22 11-17 26.22x11 6x17 27.29x18 13x22 28.30-24 and disproportionbetween white wings is obvious, besides white is also behind intempoes - a very unpleasnat combination for defence.) 24...8-12 25.38-33 12-17 26.33x22 17x28 27.48-42 18-22 28.27x18 13x22 29.29x27 15-20 30.32x23 21x41 31.42-37 41x32 32.47-42 9-13 white experience problems... ]
22...12-17
[ 22...21-26 23.27-22 18x36 24.29x7 11x2 25.32x23 and 26.4843, 27.3429 should be enoughto defend the position. ]
23.31-26 17-22 24.26x17 22x31 25.37x26 28x37 26.42x31 11x22 27.47-41 23-28 A logical move, which shouldbe performed anyway, sooner or slightly later. Black fixes the ugglywhite configuration 39,44. 28.41-37 16-21 cleaning the wing. Themore white pieces go away from his left wing, the more vulnerable theposition grows.
[ 28...6-11 29.30-24 5-10 30.48-43 14-20 31.35-30 (31.38-32? 22-27! 32.32x12 27x36 33.39-33 8x17 34.33-28 13-18 e.t.c. white has a damaged left wing, althoughblack has his own problem - piece 11, which makes realization ofwhite weakness problematic.) 31...10-14 32.38-32 22-27 33.31x33 18-23 34.29x18 20x49 35.34-29 25x12 36.32-27 49x21 37.26x6 14-20 etc.= ]
29.26x17 22x11 30.38-32 8-12 31.32x23 13-19 32.48-43 19x28 33.43-38 This moment Boomstra had 2 plans to consider. Onewas the one he chose in the game, and which according to psychologywas the right one, although neither of the plans gives success... 11-16
[ 33...9-13 34.30-24 12-17 35.38-32 18-22 36.32x23 22-27 37.31x22 17x30 38.35x24 14-20 39.39-33 11-17 40.33-28 6-11 41.37-31 11-16 42.44-39 5-10 43.40-35 e.t.c. ]
34.30-24 12-17 35.31-26
[ 35.38-32? 18-22 36.32x23 14-19 37.24x4 17-21 38.4x27 21x41 with scaring end game for white,since there are good defending black base pieces intact. ]
[ 35.38-33? 18-22 36.31-26 14-20 37.24-19 9-14 38.19x10 5x14 x ]
35...6-11 36.37-31? The decisive mistake, probably done underthe time pressure. I believe that in a normal situation Groenendijkcould easily calculate the draw after:
[ 36.35-30!! 14-20 (36...9-13 37.38-32 18-22 38.32x23 22-27 39.40-35 27-31 40.39-33 31x42 41.23-18 13x22 42.33-28 22x33 43.29x47 17-22 44.24-20 15x24 45.30x10 5x14 46.47-42 11-17 47.44-39 22-28 48.45-40 16-21 49.34-29 21-27 The sacrifice idea always exist in this sortposition. 50.39-33 28x39 51.40-34 39x30 52.35x24=; 36...3-8 37.38-32 18-22 38.32x23 22-27 39.39-33 27-31 40.33-28 31x42 41.28-22 17x19 42.24x4 42-47 43.4-10 47x35 44.10x2 11-17 45.34-30 35x24! 46.2x35 25-30 47.35x21 16x27=) 37.38-32 18-22 38.32x23 22-27 39.39-33 27-31 40.33-28 31x42 41.28-22 17x19 42.24x4= ]
36...16-21 37.35-30
[ 37.38-32 28x37 38.31x42 21-27 39.42-38 (39.39-33 18-23 40.29x18 25-30 41.34x25 14-20 42.25x14 9x47 x) 39...9-13 40.38-33 27-32 x ]
37...9-13 38.29-23 18x20 39.30-24 20x29 40.34x32 13-18 41.40-34 14-19 42.38-33 5-10 43.45-40 10-14 44.33-28 14-20 45.39-33 19-24
0-2












(2) Boomstra,R.P. (Roel) - Groenendijk,J. (Jan)
World Title Match 2016, 04-12-2016


1.32-28 17-21 2.34-29 21-26 3.40-34 16-21 4.45-40 11-16 5.50-45 6-11 6.38-32 12-17 7.42-38 7-12 8.47-42 1-6 9.29-24 20x29 10.33x24 19x30 11.35x24 18-22 12.40-35 22x33 13.38x29 14-20
[ 13...13-18 14.32-27 21x32 15.37x28 26x37 16.41x32 9-13 17.46-41 16-21 18.41-37 21-27 19.32x21 17x26 20.43-38 11-17 21.39-33 4-9 22.44-39 17-22 23.28x17 12x21 24.33-28 6-11 25.45-40 11-16 26.35-30 8-12 27.40-35 2-8 28.38-33 12-17 29.30-25 18-23 30.29x18 13x22 31.34-29 8-13 32.49-44 14-20 33.25x14 10x30 34.35x24 and to summarize: black has overplayedhis position, having disbalance now between both the wingsas well asunderdeveloped pieces. After all black managed to defend, butprobably there was some chance for white as well. ]
14.32-27 21x32 15.37x28 26x37 16.41x32 10-14 17.43-38 20-25
[ 17...17-22 18.28x17 12x21 19.46-41 13-18 20.32-28 11-17 21.41-37 5-10 22.45-40 20-25 23.37-31 9-13 24.39-33 14-20 25.44-39 10-14 26.49-44 2-7!? 27.42-37 21-26 28.28-23 7-12 29.38-32 14-19 30.23x14 20x9 31.48-43? Refusing from 31.3127 0914and simplifications... 17-21 32.32-28? 12-17 and I startedexperiencing problems. ]
18.46-41 13-18 19.41-37 14-20 20.37-31 17-21 21.31-27 21-26 22.42-37 9-13 23.39-33 4-9
[ 23...11-17 24.44-39 (24.27-21? 16x27 25.32x21 17-22 26.28x17 13-19 27.24x22 8-13 28.17x19 26x50 x) 24...17-22 25.28x17 12x21 26.33-28 4-9 27.38-33 5-10 28.48-43 8-12 29.43-38 10-14 alsoplayable, but black has to be careful, since white has tempoadvantage + center, in spite of a couple of weaknesses. ]
24.44-39 2-7 25.28-23
[ 25.48-42 18-22 26.28x17 11x31 27.36x27 12-18 28.33-28 7-11 29.49-44 18-22 30.27x18 13x33 31.39x28 16-21 e.t.c. interesting structures, but position should end in a draw.Still it is logical that white refused from this, because it doesn'thave control over his long wing. ]
25...18-22 26.27x18 13x22 Black tries to make use of the fact that white doesn't have a column47, 42, 37, thus they don't have a proper control of his long wing,at the same time the development of white short one can only be madeby exchange 3430, which can be foreseen. 27.49-43 16-21
[ 27...12-17? 28.35-30! with unplesanant and dealy threat 3731! ]
28.34-30 25x34 29.39x30 11-17 30.45-40
[ 30.43-39 20-25 31.48-43 25x34 32.39x30 6-11 33.43-39 with thesame threat 3731 9-13 34.24-19 13x24 35.29x20 15x24 36.30x19 3-9 37.35-30 and white has managed to develop his short wing,simultaneously preventing black from creating an effective column 27,22, 18. Although, of course this is far from a real chance. ]
30...20-25 31.40-34 22-27 black plan is the same: slowly to builda column 27, 22, 18 in some variation to play effectively againstwhite long wing. 32.32-28 8-13 33.37-32?!
[ 33.24-19! This waywhite prevents black from making the abovementioned column fast,besides he finds an outlet for his short wing: gets a space forplaying. 13x24 34.30x19 7-11 35.37-32 5-10 36.43-39 11-16 37.35-30 26-31 38.48-42 6-11 39.30-24 9-14 40.19-13 31-37 41.42x22 12-18 42.23x12 17x30 43.22-18 e.t.c. ]
33...13-18 34.23-19 9-14 35.19x10 15x4 36.28-23 26-31 37.23-19? Looks likewhite has lost a clue for the game. He is proceeding with piece 23 to14, and with piece of 24 to 15, which costs a lot of time, and is nota serious danger for black, since black has good defenders: 3, 4 and5, while black himself can effectively use this time to finally breakthe white long wing. It was necessary to contradict black plans with:
[ 37.48-42! 6-11 38.32-28 11-16 39.24-19 21-26 40.42-37 31x42 41.38x47 e.t.c. = ]
37...6-11 38.19-14 17-22 39.48-42
[ 39.33-28? 22x42 40.48x6 27x49 41.6-1 49-38 and ...1823 ]
[ 39.24-20 21-26 40.32x21 26x17 41.36x27 22x31 42.48-42 31-36 43.42-37 17-21 44.30-24 21-27 45.20-15 27-32!! 46.37x28 (46.38x27 4-10 47.15x4 12-17 48.4x22 17x10 x) 46...4-10 47.15x4 5-10 48.4x6 10x48 Good chance for black ]
39...11-16 40.24-20 21-26 41.32x21 16x27 42.20-15 31-37 43.42x31 26x37 44.30-24 27-31??
[ 44...27-32! 45.38x27 22x31 46.36x27 18-23 47.29x18 12x23 48.33-29 4-9 49.29x18 9x40 50.35x44 37-41 51.27-21 41-47 52.21-17 47-29 e.t.c. with black win ]
45.36x27 22x31 46.15-10 4x15 47.14-9 3x14 48.24-20 15x24 49.29x9 37-41 50.9-3 31-36 51.3x26 7-11 52.38-32 41-46
[ 52...41-47 53.34-30 25x34 54.26-48 47x15 55.43-39 34x43 56.48x16= ]
53.26-3 46x30 54.35x24 5-10 55.24-20 25x14 56.3x20 36-41 57.20-29 18-22 58.29-33
1-1












(3) Groenendijk,J. (Jan) - Boomstra,R.P. (Roel)
World Title match 2016, 05-12-2016


1.32-28 19-23 2.28x19 14x23 3.37-32 10-14 4.34-30 17-21 5.41-37 11-17 I have found 4 Roel Boomstra's games with black in thisopening in database against reasonably strong opponents: Kirzner,Heusdens, Andriesen and Ndjofang. But in my memory there are more ofthem played by him in different Blitz tournaments, barrages e.t.c. Inall the above-mentioned games he obtained a long lasting advantage,but won only in one of them. Still it was obvious from what he didthat he knows this opening and it has been analyzed and checkedbefore for continuations. 6.33-28?! I presume Groenendijk knows itand tries to deviate. In most of the games Roel's opponents played6.3025 0711 7.4034 0107 and sooner or slightly later accomplished achange 3429, after which black was unobstructed to develop hisinitiative. 5-10 7.28x19 14x23 8.39-33 7-11 9.30-25 10-14 10.33-28 Giving away 4 tempos Groenendijk attempts to switch forclassics - a tactic sometimes present at Jan's games. This timealthough he has to remember of problem on his long wing - 46. 13-19 11.31-27 21-26 12.38-33 9-13 13.43-38 2-7 14.44-39 17-22! Goodpositional understanding on Boomstra's part! Instead of attempt toplay against piece on 46, which obviously will not succeed, he takesan attempt to damage white left wing, not allowing him to close in onclassics. But when the wing is damaged then more options for blackcan arrive.
[ 14...17-21 15.40-34 12-17 16.49-43 7-12 17.34-30 20-24 18.46-41! and obviously black will not escapechange ...1722, but in a more static position. ]
15.28x17 11x31 16.36x27 7-11 17.46-41 12-17 18.49-43 17-22 19.41-36 22x31 20.36x27 8-12 21.40-34 11-17 22.33-28 20-24 23.39-33 4-9 24.45-40 6-11 25.50-45 1-6 26.47-41 17-21! Black has managed todamage white left wing, which was so strong just 11 moves ago. Whiteis set on serious reflection. 27.25-20?! White doesn't want torisk feeling time pressure and accepts passive simplifications.
[ 27.34-29! Seems that the best move to keep the balance, withoutgiving up initiative. 23x34 28.40x20 15x24 29.28-22 18-23 30.33-28 12-18 (30...14-20? 31.25x14 9x20 32.22-17 11x31 33.32-27 31x33 34.38x7 x) 31.43-39 14-20 32.25x14 9x20 33.38-33
A) 33...20-25 34.42-38 3-9 35.45-40 11-17 36.22x11 6x17 37.48-42 17-22 38.28x17 21x12 39.33-28 24-29 40.40-34 29x40 41.35x44 and so on with a draw.
B) 33...23-29 34.42-38 29-34 (34...20-25 35.39-34 29x40 36.35x44 18-23 37.48-43 23-29 38.43-39 25-30 and white canalways in these positions play a typical change 2823, 2722...) 35.39x30 20-25 36.28-23 19x39 37.30x8 3x12 38.22x13 12-18 39.13x22 39-44 40.22-18 26-31 41.37x17 11x13 42.41-36 6-11 (42...44-49 43.48-43 and 44.3228) 43.32-28 11-17 44.38-32 13-18 45.45-40= ]
[ 27.41-36? 24-29 28.33x24 19x39 29.28x17 11x31 30.36x27 18-23 31.43x34 23-28 32.32x23 21x41 x ]
27...14x25 28.27-22 18x27 29.34-30 25x34 30.40x7 11x2 31.41-36 2-7 32.37-31 26x37 33.42x22 21-26 34.36-31 26x37 35.32x41 7-12 36.41-36 15-20 37.36-31 20-25 38.31-27 3-8 Blackhas initiative: it controls development of white piece on 45. Besideswhite has to look out for ...0611, ...1217 or ...1218 the rightmoment. Georgijev likes these positions, because the ideas for blackare not standard, and the position is countable with difficultjuxtaposition of positional and tactical ideas. 39.38-32? It isnaive to think that with prohibition of 39....0611?? 40.2218 whiteprobems are over.
[ 39.48-42! 12-17 40.22x11 6x17 41.38-32 13-18 42.42-37 18-23 (42...8-13 43.45-40 18-23 44.43-39 17-21 45.27-22 23-29 46.22-18 29x27 47.18-12 27-32 48.35-30 24x22 49.37x26=) 43.37-31 23-29 44.43-38 8-12 45.31-26 9-13 46.27-21 16x27 47.32x21 13-18 (47...25-30 48.45-40 13-18 49.21-16 18-23 50.28-22 17x39 51.40-34 29x40 52.35x33 12-17 53.26-21 17x26 54.16-11=) 48.45-40 18-23 49.40-34 23x43 50.34x14 43-49 51.14-10 49x16 52.33-28 12-18 53.10-4 18-22 54.4x36 17-22 55.36x30 25x34 56.28-23= ]
39...12-17? Missesanything in just one move. It was much stronger:
[ 39...12-18! 40.43-38 8-12
A) 41.48-42? 18-23 42.45-40 25-30
A1) 43.40-34 30x39 44.33x44 12-18! 45.22-17 24-29 46.28-22 29-33 47.38x29 23x34 48.32-28 19-24 (48...34-40 49.17-11 16x7 50.22-17 40x49 51.28-23 49x3 52.23x1 19-24 with unpromising endgame.) 49.42-37 34-40 50.28-23 18x29 51.17-12 40x49 52.12-7 49x21 53.7-1 21-26 54.1x45 26x48 with even more terrible end gameto look at.
A2) 43.42-37 23-29 44.40-34 29x40 45.35x44 30-34 46.37-31 (46.44-39 34x43 47.38x49 12-18 x) 46...34-39 47.44-40 12-18 48.33x44 16-21 49.27x16 18x36 50.28-22 36-41 51.22-17 24-30 52.44-39 19-24 53.40-35 9-14 54.32-28 14-19 and black sets a king finally.
B) 41.45-40!
B1) 41...18-23 42.40-34 12-17 43.22x11 16x7 44.27-22 7-11 45.48-43
B1a) 45...11-16 46.34-29 23x34 47.43-39 34x43 48.38x49 24-30 49.35x24 19x30 50.49-44=
B1b) 45...11-17 46.22x11 6x17 47.43-39 9-14 48.35-30 24x35 49.33-29 17-22 50.29x20 22x44 51.20-15 44-50 52.15-10 50-45 53.32-27 45x31 (53...45x47 54.10-5 19-24 55.5-23 47-36 56.27-21 36-22 57.23-34 22-6 58.34-1=) 54.10-4 31-37 55.4-18=
B2) 41...25-30 42.48-43 9-14 43.43-39 18-23 44.22-17! 12x21 45.40-34
B2a) 45...6-11 46.34x25 11-17 47.39-34 13-18 48.34-30 23-29 49.27-22 18x27 50.28-23 19x37 51.30x10 27-32 52.38x27 29x38 53.27-22 17x28 54.10-5 28-32 55.25-20 38-42 56.5-19=
B2b) 45...21-26 46.34x25 16-21 47.27x16 26-31 48.28-22 23-28 (48...31-36 49.33-28 36-41 50.16-11 6x17 51.22x11=; 48...13-18 49.22x13 19x8 50.33-28 23-29 51.28-22 31-36 52.22-17 36-41 53.16-11=) 49.32x23 19x17 50.39-34 14-19 51.34-29 24-30 52.25x34 31-36 53.16-11= ]
40.22x11 6x17 41.43-39 13-18 black just allowswhite to make a draw by a simple combination.
[ 41...8-12 42.27-22 12-18 43.22x11 16x7 44.45-40 7-12 45.48-43 12-17 46.43-38 18-23 47.40-34 9-14 48.35-30 24x35 49.33-29 and thiswe already had in analyses just before. ]
[ 41...19-23 42.28x30 25x43 43.48x39 17-22 44.27x18 13x22 45.39-34 16-21 46.34-29 21-26 47.29-24= ]
42.28-22 17x37
1-1












(4) Boomstra,R.P. (Roel) - Groenendijk,J. (Jan)
World Title match, 06-12-2016


1.32-28 17-21 2.37-32 21-26 3.41-37 11-17 4.34-29 19-23
[ 4...18-22 5.40-34 13-18 6.45-40 9-13 7.29-23 18x29 8.34x23 I checked that Boomstra had played it athis junior age, but not often nowadays. All the draughts world knowsthat if Roel has played any dry variation from the opening in thepast that means that now he has a profound knowledge of it, since heis always up-to-date with the opening variants. ]
5.28x19 14x34 6.39x30 7-11 7.44-39 17-22 8.50-44 1-7 9.31-27 22x31 10.36x27 11-17 11.33-28 Boomstra prohibits direct attack by 11...1722,which would render his long wing more static in classical game. Incase of 11... 0711 he is ready with 12.2823 and 13.2722 leaving smallinconvenience in black position now - pice on 6. At the same time inposition on a diagram change with the prospect of attacking the longwing by 11....1722? 12.28:17 is impossible, because of 3024, 3731,3934x 20-25 Black invites white to make a decision. 12.28-23 18x29 13.27-22 25x34 14.39x30 17x28 15.32x34 15-20 I don't quitesupport this idea of moving piece from 15 to 25. After all - temposare equal and white cluster of pieces 30, 34, 35, 40, 45 have notcome into contact with black pieces. Why not develop black short wingby means of ...1218, ...0712, ...0611, ...1117. White will not beable to perform both tasks then: to occupy safe center and havecontrol over its long wing. With the text move black comes intocontact with the above-mentioned white cluster, thus it is easier nowfor white to construct. 16.44-39 20-25 17.37-32 12-18 18.32-28 10-14 19.46-41 16-21 20.30-24 5-10 21.39-33 18-22 Again. Why tolose tempos by just developing one black piece with the second (26)still having passive position in the corner? To my mind it wasreasonable to collect tempos and balance the wings: ...0711, ...1822,...11:22, ...1319, ...09:18. 22.28x17 21x12 23.41-37 6-11 24.38-32 13-18 25.42-38 11-17 26.43-39 18-22? A positionalmistake: black is going the wrong direction - destroying his columnsand rendering even the strong piece 17 a weakness now, because thereare now active columns to play against the white center. It wasbetter to play, for example,
[ 26...9-13 27.49-43 3-9 28.32-28 10-15 and now white has to make a decision. After 4741black can damage the monolitj by ...1420 and then black plays onwhite long wing, which lacks column 47, 42, 37. ]
27.49-43 8-13 28.47-41 14-19? I don't understand this move: black helps white toget rid of his underdeveloped pieces on his short wing,simultaneously giving up fight for the center ever and giving 2tempos to white as well.
[ 28...3-8 29.32-28 12-18 30.34-30 25x34 31.40x29 13-19 32.24x13 8x19 e.t.c. is a typical play inthese positions: creating weaknesses in white position and playingsolid in the center after that. ]
29.34-30 25x34 30.40x29 19x30 31.35x24 7-11 32.39-34 11-16 33.32-28 22-27 34.45-40 27-31 Black tries to weaken white long wing at least to have some directionof play for the future. Black has lost his battle for the center,thus when black tries to create some column from the rare or thecorners white will easily avoid them. Thus in those situation somecorner pieces will stay for black anyway. 35.38-32 31x42 36.48x37 13-18 37.41-36 17-21 Black attempts to maintain some control overhis short wing to answer white center with column 18, 13, 9. 38.36-31 12-17 39.31-27 2-8 40.43-38 10-14 41.34-30 8-13 42.30-25 But although black position looks outwardly quite amonolith, but the problem is that white has huge tempo advanatge of+10, and white can easily find some tempo, bt black in such a casehas to destroy his defensive lines... 18-22 43.27x18 13x22 44.40-34 Logical - an attempt to win. The rest is a draw:
[ 44.28-23 22-27 45.24-19 4-10 46.29-24 3-8 47.24-20 10-15 48.19x10 15x4 49.40-35 27-31 50.23-18 (50.32-28 31x42 51.38x47 26-31 52.20-15 8-13 53.35-30 21-26 54.30-24 31-37=) 50...31x42 51.38x47 26-31 and no 52.18-12? 9-13 53.12x3 21-26 54.3x21 16x29 ]
44...22-27 45.24-19 14x23 46.28x19 17-22 Black plays for tactical restrictions: 47.19-14
[ 47.34-30 27-31 (47...9-13! 48.19x8 3x12 49.30-24 27-31 50.25-20 31x42 51.38x47 26-31 52.20-14 21-27 53.32x21 16x27 54.24-20 27-32=) 48.32-28 31x42 49.28x17 21x12 50.38x47 16-21 51.19-14 9x20 52.25x14 21-27 53.30-24 27-32 54.24-20 12-17 55.20-15 17-22 56.14-10 22-28 57.33x22 32-38 58.10-5 38-43 59.22-17 43-49 60.17-11 49-40 61.5-23 and white wins ]
[ 47.29-24 4-10 48.34-29 26-31 49.37x28 9-14 50.32x21 14x43= ]
47...9x20 48.25x14 27-31 49.29-24
[ 49.32-28 31x42
A) 50.28x17 21x12 51.38x47 3-9 52.14x3 12-17 53.3x21 16x27 54.29-23 27-32 55.23-18 32-37 56.18-12 26-31 57.12-7 31-36 58.7-2 37-41 59.33-28 41-46 60.28-22 46-14 61.22-18 14-25 62.34-29 36-41! (62...25-9? 63.2-24 9x22 64.47-41 36x47 65.24-15 47x24 66.15x6 x) 63.47x36 25-3 (63...25-20 64.2-24 20-3 e.t.c.=)
B) 50.38x47 22-27 51.28-22 (51.29-24 27-31 52.24-20 31-37 53.20-15 26-31 54.14-10 31-36 55.10-5 36-41 56.47x36 37-42 57.5-14 42-47 58.34-29 47-42 59.28-23 21-27 60.23-18 42-26 and the end gamelooks a draw.) 51...27x18 52.29-24 21-27 53.24-20 26-31 54.20-15 31-37 55.14-10 18-23= ]
49...31x42 50.38x47 26-31 51.34-29 21-27 52.32x21 16x27 53.24-20 27-32 54.20-15 22-28 55.33x22 32-38 56.14-10 38-43 57.10-5 43-49 white piece 22 can't be hidden: it'salways under attack - direct and indirect. 58.5-28 49-35 59.22-17 3-9 with 60....0410 or in case of 60.2810 3544 and 61....4440=
1-1












(5) Groenendijk,J. (Jan) - Boomstra,R.P. (Roel)
World Title match, 08-12-2016


1.32-28 17-21 2.37-32 19-23 3.28x19 14x23 Boomstra attempts toreach his favorite position again after 4.4137 1014 (from the opening1.3228 1923) 4.34-29 23x34 5.40x29 It looks strange, but it isjustifiable, because it is for sure a deviation from Boomstra'svariants, besides if black tried to secure a semi-fork structure by...1014, ...1419,...1924 then black has several pieces on his longwing underdeveloped, which in its turn renders this structure not soeffective. 10-14 6.45-40 14-19 7.40-34 5-10 8.50-45 10-14 9.41-37 11-17 10.34-30 White decides this time to play logicaldeveloping moves. 17-22 11.30-25 21-26 12.44-40 22-27 Roel optsfor balancing his position first on a short wing. He rightlyevaluates that white has a stronger long wing than that of black tosart mutual long wing attack by ...0711, 3934 1217, 3430 13.32x21 Often players capture first 31:22, because it means that blackcenter piece is removed in exchange for white semi-corner. 26x17 14.37-32 6-11 15.46-41 17-21 16.41-37 21-26 17.39-34 16-21 18.43-39 11-16 Now black is ready to attack white long wing by...1822 19.31-27 1-6 20.27-22 Groenendijk doesn't try forsomething more exciting, which in an ordinary tournament he wouldsurely try like:
[ 20.49-44 7-11 21.48-43 12-17 22.47-41 ]
20...18x27 21.29-23 19x28 22.33x31 13-19 23.39-33 12-18 24.31-27 8-13 25.33-28 20-24 26.34-30 18-23 27.38-33 14-20 28.25x14 9x20 29.42-38 4-9 30.49-43 7-12 31.43-39 12-18 32.30-25 2-7 33.25x14 9x20 34.40-34 20-25 Just a very typical classical structure: blackhas 2 corners, and advantage in tempos, which is not so well for thistype of position, but white has to find the continuation, and sincecorner 25 is not to be overtaken, most ofte it is Ghestem attack. 35.48-43 15-20 To prevent taking of corner 25 by 36.3430 36.28-22 7-11 37.33-28 24-29 38.36-31? A standard continuation,but not in this position. Groenendijk is already in serious timetrouble and plays according to general standard, not been allowed tocalculate the position properly. It was no problem to keep thebalance after:
[ 38.47-42 29x40 39.45x34 20-24 40.38-33 11-17 41.22x11 6x17 42.42-38 3-9 43.34-30 25x34 44.39x30 23-29 45.43-39 29-34 46.30-25 34x43 47.38x49 18-22 48.27x18 13x22 49.36-31= ]
38...29x40 39.45x34 20-24 40.38-33? A gravepositional mistake. It was still no serious problem after:
[ 40.47-41 11-17 41.22x11 6x17 42.41-36 17-22 43.28x17 21x12 44.34-30 25x34 45.39x30 24-29 46.30-25 19-24 47.43-39 3-8 48.27-22 18x27 49.31x22 12-18 50.22-17 16-21 51.38-33 29x27 52.17-11= ]
40...11-17 41.22x11 6x17 42.34-30? Probbaly thefinal mistake. But in this case I can't blame Groenendijk, becausenobody with time he had could find defence in this position andbelieve for white in some analyse positions, which emerge on the way.The draw was still after a difficult defense:
[ 42.43-38! andthe most paradox defense is this one, not to take it long: 17-22 43.28x17 21x12 44.33-28 3-8 45.38-33 12-17 46.47-42 24-30 (46...8-12 47.42-38 17-21 48.28-22 23-28 49.32x14 21x41 50.22-17 12x21 51.14-10 26x37 52.38-32 37x28 53.33x22 18x27 54.10-4 41-46 55.4x31 46-23 56.31-48 23x45 57.35-30 25x43 58.48x26=) 47.35x24 19x30 48.28x19 13x24 49.34-29 30-35 50.29x20 25x14 51.32-28!! An excellent move opening up 2 threats simultaneously52.2822 and 52.3732 26:48, 53.3329 = ]
42...25x34 43.39x30 23-29 44.43-38 3-9 All this looks hopeless for white, although insome case black has to be precise. 45.28-23
[ 45.30-25 17-22 46.28x17 21x12 47.35-30 24x35 48.33x24 19x30 49.25x34 18-23! 50.38-33 (50.27-22 23-29 51.34x23 35-40 52.23-18 12x23 53.22-17 40-44 54.17-12 44-50 55.12-7 16-21 56.7-2 23-29 57.2x33 50x36 x) 50...13-18 51.47-42 9-14 52.42-38 14-20 53.33-28 23-29 54.34x23 18x29 55.27-22 35-40 56.22-18 12x23 57.28x19 40-44 58.19-13 44-49 59.31-27 20-25 60.13-8 29-33! 61.38x29 49-40 62.8-3 40x42 x ]
45...19x39 46.30x8 9-13 47.8x19 39-44 48.19-14 44-49 Black wants to win by 49. ...1822 and 50....2933 49.14-9 29-33 50.38x29 18-22 51.27x18 49x4 52.29-24 4x36 53.37-31 36x30 54.35x24 21-27 55.24-19 27-32 56.19-14 32-38 57.14-10 38-43 58.10-4 43-49 An absolutely hopeless end game forwhite. He can't cut black pieces over the line: black will always waythrough squares 10 and 4 to push white king out of the line. 59.4-15 49-32 60.15-4 32-23 61.4-36 23-37 62.36-18 17-21 63.18-36 37-10 White can't play with a king ny more, because of64....1041 65. 47:36 2127x 64.47-42 10-4 65.36-47 4-31 66.42-38 31-4 67.38-33 26-31 68.47-41 21-27 69.41-23 31-36 70.23-14 4-15 71.33-28 15-4 Black secures the position, in which white king isin front of his piece, and soon the trap with pieces 16, 27 will beinactivated. 72.14-19 27-31 White gives up, because the nextmove is 73.... 3641, and if 74. 2822 04:27 75.19:46 the trap 75....3137x
0-2












(6) Boomstra,R.P. (Roel) - Groenendijk,J. (Jan)
World Title match, 09-12-2016


1.34-29 17-21 2.31-26 19-23 Groenendijk attempts to avoid thepopular opening with 2... 1117, for which Roel could have somethingin store for him, 3.26x17 12x21 4.36-31 23x34 5.39x30 7-12 6.44-39 14-19 7.50-44 1-7 8.40-34 10-14 9.44-40 11-17 10.32-28 18-22 11.41-36 20-25 12.30-24 19x30 13.35x24 5-10 14.49-44 White threangthens its short wing against black attacks with14....1419. 14-19
[ 14...13-18 15.37-32 9-13 16.31-27 22x31 17.36x27 3-9 18.46-41 21-26 19.34-29 7-11 20.41-36 17-22 21.28x17 11x31 22.36x27 6-11 23.33-28 11-17 24.27-21 16x27 25.32x21 26-31 (25...14-19? 26.42-37 19x30 27.29-23 18x29 28.28-22 17x28 29.40-35 26x17 30.35x11 x) 26.21-16 and soon with parity. White has a corner piece on 16, but he has center onthe other side of the board. Sometimes this plan with 14....1318 andpushing on 27 can work out well, especially after white has movedpiece on 49, but in this peculiar case it is not so effective,because white long wing is not weak. ]
15.40-35 19x30 16.35x24 10-14 17.47-41 13-18?! Not effective here, since black grants whitetime to close the holes in the position. It was logical to go on withthe attack:
[ 17...14-19 18.34-30 25x34 19.39x30 13-18 20.24x13 8x19 21.37-32 2-8 and black just cements his positionand he is not behind in tempos while white has to think how to betterdevelop piece on 46, besides white short wing is still slightlyweakened. Of course 2x2 is possible for white, but still there aresome pieces to be developed anyway. ]
18.37-32 21-26? This isreally weak positionally, since black gives away 4 tempos, controlover his short wing, besides it is impossible to endanger whiteforwarded piece in any way.
[ 18...7-11 not anythingespecial, but at least black prevents white change 3127 19.34-29 21-27 20.32x21 17x37 21.41x32 9-13 22.28x17 11x22 and black willhave some tempos, after he changes piece on 24 in compensation forwhite dynamic position. ]
19.44-40 26x37 20.42x31 14-20 21.31-27! simple, but effective. White gets rid of any possibleunderdeveloped piece. Any idea of surrounding for black is destroyed. 20x29 22.34x23 22x31 23.36x27 18x29 24.33x24 8-13 25.39-33 3-8 26.40-34 13-19 What else?! At least black regains some of thelost tempos, and tries to balance his position. 27.24x13 9x18 28.45-40 18-23 29.28x19 17-22 30.27x18 12x14 31.41-37 7-12 32.43-39 8-13 33.46-41 14-19 34.41-36 12-18 35.36-31 15-20 36.31-27 18-23 Outwardly it looks a simple position, but in factblack has underdeveloped pieces 25 and 16, which should bestrengthened, and the black wings are torn one from the other. Whitefirmly controls black short wing, at the same he reserves for himselfa possibility to choose for tempo on black long wing - white piece isnot yet on 35. 37.37-31 20-24 38.48-43 2-7 39.31-26 4-9 40.33-28 7-12 41.40-35 6-11? A positional mistake that causesproblems for black, especially in Groenendijk's case when he doesn'thave time at all.
[ 41...24-29! 42.34-30 25x34 43.39x30 6-11 44.38-33 (44.28-22 12-17 45.32-28 23x21 46.43-39 17x28 47.26x6 29-34 48.39-33 28x39 49.6-1 34x25 50.1-6 39-43 51.38x49 25-30 52.35x24 19x30=; 44.43-39?? 16-21 45.27x18 13x44 x) 44...29x49 45.30-24 19x30 46.28x6 9-14 47.35x24 16-21 48.26x17 49-35 49.24-20 14x25 50.6-1 35-19= ]
42.38-33! A very precise move. And now blackhas to decide: 13-18 Looks to me like Groenendijk has managedto calculate for a draw in the text variant even in a situation whenhe was so pressed for time.
[ 42...12-18 43.43-38 9-14 44.26-21 25-30 45.34x25 11-17 46.21x12 18x7 47.39-34 7-12 48.35-30 24x35 49.33-29 12-18 50.27-22 18x27 51.29x20 27-31 52.20-15 31-36 53.38-33 36-41 54.33-29 16-21= ]
[ 42...11-17? 43.43-38 16-21 44.27x16 12-18 (44...9-14 45.16-11 17x6 46.35-30 24x35 47.33-29 with serious problems for black to make a draw.) 45.16-11 17x6 46.26-21 6-11 47.21-17 11x22 48.28x17 9-14 49.32-27 x ]
43.28-22 9-13 44.32-28 23x21 45.26x6 18x27 46.6-1
[ 46.33-28 24-30 47.35x24 19x30 48.6-1 12-17 49.1-6 (49.1-23 27-31 50.23-10 13-18 51.10-4 31-36 52.4x6 36-41=) 49...17-21 50.28-23 27-31 51.23-18 13x22 52.6x28 31-36 53.28-46 21-27 54.46-14 30-35 55.43-38 16-21= ]
46...12-17 47.1-6 17-21 48.34-30 25x34 49.39x30 21-26 50.6-28 and the opponents agreedon a draw, because 50....1318 51.28:10 2429 52.33:24 1823
[ 50.33-28 13-18 51.6-1 18-23 52.1x15 19-24 53.15x21 16x27= ]
1-1












(7) Groenendijk,J. (Jan) - Boomstra,R.P. (Roel)
World Title match, 10-12-2016


1.32-28 19-23 2.28x19 14x23 Black is again ready to repeat:3.3732 1014 4.4137 1721, but when after this he often procuresperspective positions, especially within a psychological battle in amatch, why shouldn't he aim at that?! 3.34-30 18-22 4.40-34 12-18 5.45-40 7-12 6.50-45 10-14 7.31-27 22x31 8.36x27 20-25 Blackaccepts the invitation for fight. It was still possible to play 8...1419 9.4136 1721 and so on, hoping for classical game. 9.37-32 1-7 10.33-29 17-21 11.38-33 5-10 12.41-37 21-26 13.43-38 11-17 14.46-41 14-19 This is a sort of move, with which black attemptsto restrict a choice for variations, leaving only 2 of them: 1)15.3328 1822 16.29:18 22:33 17.39:28 13:33 18.38:29 1721 and whitehas a serious weak ness of his short wing. 2) tTo play 15.3024 andaccept Roozenburg attack, which can be dangerous in some cases,because black has a classical sacrifice of piece on 23 with thesometimes deadly attack on white piece 27. 15.30-24 19x30 16.35x24 17-21 The right strategy for black, because now all theshort black wing is gradually attacking piece on 27. 17.33-28 12-17 18.28x19 17-22 19.41-36
[ 19.19-14?? 10x30 20.39-33 30x50 21.49-44 50x28 22.32x1 21x43 23.48x39 2-7 24.1x36 9-14 25.36x20 15x35 x ]
19...22x31 20.36x27 7-12 21.47-41 12-17 22.38-33 17-22 23.41-36 22x31 24.36x27 2-7
[ 24...6-11 25.49-43 11-17 and now a standard plan again: first white gets rid of the structureby: 26.37-31 26x28 27.33x11 16x7 28.27x16 9-14 now preventsblack from playing later on 28 29.43-38 14x23 30.38-32 4-9 Nowwhite controls active black moves by 2420. 31.42-37 9-14 Thegeneral idea for white is to play 32... 1420 and try to attack pieceon 24, because piece 40 can't be moved, because of combination. Butthat's just a general idea; in this position it can't simply work. 32.39-33? A positional mistake because black will create a wrongwhite cluster of pieces 33 and 39, which can't be developed orstrengthened, and which can't attack black piece on 23: (32.37-31! 7-12 33.31-26 12-17 34.48-42 2-7 35.42-37 3-9 36.37-31 14-20 37.39-33 10-14 38.44-39 and in spite of the whiteweaknesses his tempos has played important role: it is even betterposition for white now.) 32...14-19 33.44-39 19x30 34.40-35 10-14 35.35x24 14-19! not to leave black pieces behind on his longwing. 36.45-40 19x30 37.40-35 8-12 38.35x24 12-17 with aconsiderable advantage for black. ]
25.40-35 7-11 26.35-30!! Anexcellent move characteristic for Jan's best games! 26-31! Itis the right time for black to switch for a draw. Otherwise black canfall in trouble:
[ 26...11-17? 27.42-38 17-22? and now a typical white combinationin these positions, which changes evaluation of position for white: (27...9-14 28.49-43 14x23 29.24-19 13x35 30.37-31 26x28 31.33x2 21x32 32.38x27 15-20 33.29x18 20-24 34.2x30 35x24 and so on withserious white advanatage.) 28.37-31 26x28 29.19-14 21x43 30.14x5 28-32 31.49x27 22x31 andblack is in serious trouble. ]
27.37x17 11x31 28.42-37 31x42 29.48x37 6-11 30.45-40 9-14 31.33-28 14x23 32.28x19 11-17 33.40-35 3-9
[ 33...17-21 34.39-33 21-27 35.32x21 16x27 Black threatens with 36.... 2732,37... 1823, which in its turn also will not be a success... 36.37-32 27x38 37.33x42 3-9 38.49-43 9-14 39.43-38 14x23 40.38-32 10-14 41.44-39 8-12 42.39-33 and now even black has tomake a draw 14-19 43.42-37 12-17 44.37-31 17-21 (44...17-22? 45.33-28 22x33 46.29x38 and so on.) 45.31-27 21-26 46.33-28 4-10 47.28-22 26-31 48.27x36 18x38 49.29x9 38-42 50.24x13 10-14 51.9x20 15x24 52.30x19 42-48= ]
34.39-33 9-14 35.24-20 13x24
[ 35...14x23 36.29-24 25x14 37.24-19 13x24 38.30x28 ]
36.20x9 4x13 37.30x19 13x24 38.29x20 15x24 39.44-39 10-14 40.49-43 14-19 41.34-29
1-1












(8) Boomstra,R.P. (Roel) - Groenendijk,J. (Jan)
World Title match, 12-12-2016


1.34-29 17-21 2.31-26 21-27 3.32x21 16x27 4.37-32 11-16 5.32x21 16x27 6.41-37 27-31 7.36x27 18-23 8.29x18 13x31 Jan Groenendijkattaempts to have a position out of Roel's favorite "classics" andtechnical standard positions. This position was on the board duringEuropean Championship 2016 between Boomstra (white) and Ivanov(black). Roel won the game after all, but Ivanov played very strangein this game. 9.37-32 31-36 10.46-41 9-13 11.41-37 12-18 12.32-27 In the above-mentioned game against Ivanov Roeltransfered piece 35 on sqyare 25 immediately. Probably, I presumeRoel was careful not to fall under some prepared scheme on Jan'spart, because Jan hadn't played like this before, but Roel had, andquite recently. Openings Roel has always taken very serious. 7-12 13.37-32 6-11 14.33-28 19-23 15.28x19 14x23 16.39-33 10-14 17.35-30 4-9 18.44-39 14-19 19.30-25 20-24 20.33-28 5-10 21.25-20 White correctly doesn't allow black to strengthen hislong wing, because when it is completed after ...1014 the blackshould concentrate on directing attack on white long wing by...1217,...0106 and so on. 11-17
[ 21...24-30? 22.38-33 15x24 23.27-22 18x29 24.49-44 23x32 25.39-34 30x39 26.43x5 x ]
22.20x29 23x34 23.39x30 19-23 24.28x19 13x44 25.50x39 9-13 26.38-33 10-14 27.42-38 2-7 Black is careful to strengthen hisshort wing, because else white after black ...1319 and ...0813 can bevery active on black short wing by 3228 and probably even 2822 incertain situation. 28.45-40 7-11 29.39-34 17-22 Black opts forincreasing advantage in tempi. Another idea for black in suchposition with is to create distorted classics with 29...1116,30....1721, and to defend piece 27 white will be forced to play 4842,4237, and the whole white long wing is paralyzed in such a case, oncondition that black can build the right classical structure onanother wing, besides black has to count correctly for tempi in sucha situation. 30.43-39 22x31 31.26x37 13-19 for purpose ofstrengthening wing against potential white piece on 29. 32.34-29 8-13 33.40-35 white should always be careful in this type ofpositions to occupy square 28, especially being behind in tempi,because if black manages to secure his long wing, then white piece on28 can be a real problem, because after attack on it the whole whitelong wing is paralyzed. 3-9 34.35-30 White doesn't want toassume the slightest nuisance or risk, just the general purpose: tokeep the position very flexible. 14-20 35.30-24 19x30 36.29-23 18x29 37.33x35 11-17 38.32-27 9-14 39.38-33 13-18 40.39-34 20-25 41.49-43 14-19 42.43-38 15-20 43.48-42 1-7 44.33-29 Importantelement in this type of positions - control of square 29. If whitecontrols 29 then black has difficulties to create anything on thatwing. 20-24 45.29x20 25x14 46.38-33 19-24 47.42-38 14-20?? Thismove is unexplainable to me on Jan's part. I can't imagine himmissing this obvious positional sacrifice in position 7x7! Draw wasanything else...
[ 47...18-22 48.27x18 12x23 49.47-42 17-21 50.33-29 24x33 51.38x18 21-27 52.18-13 7-12 53.34-30 27-31 54.37x26 36-41= ]
[ 47...18-23 48.38-32 14-19 49.33-28 7-11 50.37-31 24-29 51.34-30 11-16 52.31-26 12-18 53.30-25 29-34 54.35-30 19-24 55.28x19 24x35 56.19-14= ]
48.27-21! 17x26 49.34-30 12-17 50.30x19 17-22? There was still a chance for black,but Jan is completely broken on account of the fact that he hasmissed such a simple sacrifice:
[ 50...17-21! 51.33-29 (51.35-30? 20-24 52.30-25 24x13 53.25-20 13-19 54.20-15 19-24 55.15-10 24-30 56.10-5 30-35 57.33-29 35-40 58.5-28 40-45=) 51...21-27? (51...7-12! 52.38-33 21-27 53.37-32 27x38 54.33x42 26-31 55.35-30 31-37 56.42x31 36x27 57.30-24 27-32 58.24x15 32-38 59.19-14 38-43 and looks like a drawn end game.) 52.37-32! (52.35-30? 7-12 53.38-33 20-24 54.29x20 18-23 55.19x28 27-32 56.20-14 32x41 57.28-23 41-46 58.23-19 26-31 59.33-28 46x23 60.19x28 31-37 61.14-9 36-41 62.47x36 37-42 witha drawn end game.) 52...26-31 53.32x21 31-37 54.21-17 37-41 55.17-12 7-11 56.12x23 11-17 57.35-30 20-25 58.30-24 and blackis in deep trouble. ]
51.38-32 7-11
[ 51...7-12 52.35-30 20-24 53.32-28 24x35 54.28x8 18-23 (54...35-40 55.47-41 36x47 56.8-2 47x13 57.2x49 x) 55.19x28 35-40 56.8-2 and white wins theend game. ]
[ 51...20-24 52.19x30 18-23 53.30-25 22-28 54.33x22 23-29 55.25-20 29-33 56.20-14 33-39 57.22-18 39-44 58.14-10 44-50 59.18-13 50-17 60.13-9 17-21 61.10-5 21x43 62.9-3 x ]
52.35-30 11-16 53.30-25 22-27 54.32x21 16x27 55.25x14 18-23 56.19x28 27-32 57.37-31
2-0












(9) Groenendijk,J. (Jan) - Boomstra,R.P. (Roel)
World Title match, 13-12-2016


1.34-29 17-22 2.40-34 11-17 3.45-40 6-11 4.50-45 1-6 5.31-26 16-21 6.32-28 19-23 7.28x19 14x23 8.35-30 10-14 9.30-25 Janattempts to avoid the known schemes with 9.3024 0510, 9....2328 or10....2127, since Roel Boomstra has analysed them well for sure. 14-19 10.25x14 19x10 This opening Roel has played twice withwhite: against Bulatov in 2012 and against Meurs in 2015. Victoryagainst Meurs and a draw against Bulatov. Still it seems to me thatblack has more of a space for playing and more of an option. Whiteonly can transport piece 40 on 30, and then see what black allowshim... 11.40-35 15-20 12.44-40 10-14 13.29-24 Jan attempts tobreak the structure and play something different. 20x29 14.33x24 5-10 15.34-30 23-28 Everything is possible for black. 15... 1319for example. 16.38-33 21-27 17.37-31 17-21 Black develops theshort wing immediately, because if he delays one move,
[ 17...11-16 18.42-38 then it is not possible any more: 17-21? 19.26x17 12x21 20.38-32 27x20 21.30-24 20x29 22.39-33 29x38 23.43x1 and white wins. ]
18.26x17 12x21 19.42-38 7-12 20.40-34 10-15 21.45-40 11-16 22.34-29 6-11
[ 22...21-26? isprevented now 23.47-42 26x37 24.41x23 13-19 25.24x13 8x28 26.42-37 9-13 27.38-32 27x38 28.43x23 13-19 29.49-43 19x28 30.43-38 and black is going to lose a center piece on 28. ]
23.47-42 11-17 24.40-34 Shwarzman's favorite white position:black has developed his short wing, but still can't attack ...2126.Instead black has to find some move anywhere else, which might killthe vulnerable balance of his position. 27-32!? 25.38x27 21x32 26.41-37?! After this move, which is a sort of somplification, blackhas very clear and predictable plans. It would be worth tryingsomething more original like:
[ 26.30-25? 18-23 27.29x38 28-32 28.38x27 14-20 29.25x14 9x47 x ]
[ 26.42-38 17-21 27.38x27 21x32 28.30-25 14-20 29.25x14 9x20 30.48-42 12-17 31.42-38 17-21 32.38x27 21x32 33.31-26 16-21 34.26x17 22x11 35.33x22 18x27 36.34-30 4-9 37.41-37 32x41 38.46x37 , but stilla draw. White can't find approach to create damage to black monolith. ]
26...32x41 27.46x37 17-21 28.42-38 21-26 29.30-25 13-19 Black just doesn't allow white to strengthen his attack on the blacklong wing. 30.24x13 8x19 31.34-30 9-13 32.38-32 2-8
[ 32...19-23?? 33.31-27 22x42 34.33x22 18x38 35.29x20 15x24 36.48x37 x ]
33.32x23 19x28 34.43-38 28-32 35.37x17 12x21 From this moment on I didn't understand Groenendijk's attempts atkeeping the game running. He could force a draw on a spot: 36.3024,37.2520, 39.3832 and black traps white king with a draw. Still Jangoes on: 36.33-28 26x37 37.39-33 4-9 38.38-32? Of course Iunderstand Jan's unwillingness, taking into account the matchsituation to force a draw with:
[ 38.30-24! 14-20 39.25x14 9x20 40.49-44 21-26 (40...8-12 41.44-39 21-26 42.38-32 16-21 43.32x41 13-19 44.24x22 21-27 45.22x31 26x46 46.36-31 46x43 47.48x39 3-9=) 41.38-32 18-23 42.29x9 20x27 43.9-4 27-31 44.36x27 37-41 45.4-18= , but the situation is such now that ifGroenendijk doesn't force a draw right now, then he can't play for awin anyway, but he just has to defend till the end of the game. ]
38...18-22 39.28x26 37x39 40.36-31 13-18 41.48-42 8-13 42.42-38 14-20
[ 42...18-23 43.29x18 13x22 44.38-32 9-13 45.31-27 22x31 46.26x37 13-18 47.32-28 16-21 48.37-31 3-8 49.31-26 18-22 50.26x17 22x11 51.28-23= ]
43.25x14 9x20 44.38-32 20-25 45.30-24 3-9 46.32-28 25-30 and although blackcaptures piece on 24 and white is forced to sacrifice the one on 27tobreak through on the wing, still black has no chance in the endgame. 47.31-27 30x19 48.29-24 19x30 49.35x24 9-14 50.28-22 14-19 51.22-17 19x30 52.27-21 16x27 53.17-11 30-35 54.11-7 39-44 55.49x40 35x44 56.7-2 44-49 57.2x19 18-22 58.19-41 49-35 59.41-36 35-8 60.36-41 8-12 61.41-47 27-32 62.47-33
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(10) Boomstra,R.P. (Roel) - Groenendijk,J. (Jan)
World Title match, 15-12-2016


1.33-29 17-21 2.32-28 21-26 3.28-23 Boomstra is obviouslydetermined to write one point in a score list and be certainly aWorld Champion already after this game. Normally I don't think heshould have opted for this continuation, since he knows a lot after3.3933 in all those popular variants. But this continuation from thepoint of view of safety is OK, since next white develops piece from35 with stability on his short wing, but the left wing can be leftintact, waiting for a change when black piece on 26 guarantees whitetempi, after it is captured. 19x28 4.29-24 20x29 5.34x32 15-20 6.35-30 20-25 I don't think that the black attack is a good idea,since white has no problem ever with his short wing after he makes achange. It was more advisable to build some classical structurewithout attack. 7.38-33 25x34 8.40x29 14-19 9.42-38 10-14 10.45-40 12-17 11.40-35 I am sure Roel would never play this movein a tournament game, because it is just for control after 12.3530,not for trying to develop and restrict. Most probably he should havechosen 12.2034, 13.4440, but it can be linked with some surroundingattempts on black part, if white is forced to go further to 23, andit is what Roel doesn't quite want in a game, which can bring himchampionship already today. 5-10 12.35-30 19-24 Black decides toweaken white short wing. Of course, anything else was possible in aposition with equal tempi and no weaknesses. 13.30x19 14x34 14.39x30 7-12 15.44-39 1-7 16.47-42 10-14 17.50-44 14-19 Ishould have played 17... 1319, at least to have some direction inperspective to strengthen black position on the weaker white wing -short wing. Of course, no strategy in such an open position againstsuch level of player can be successful. But, still, it is at leastlogical. 18.39-34 17-22 19.44-39 11-17 20.30-25 7-11 21.32-28 16-21 22.34-29 9-14 23.49-44 3-9 24.44-40 21-27
[ 24...4-10? 25.39-34! 10-15 26.29-23! 18x29 27.34x23 with a terrible position for black. 21-27?? 28.23-18 12x32 29.37x28 26x37 30.41x3 x ]
25.37-32 Blackhad opened a change ...1721, thus white reaction is logical. 26x37 26.32x21 17x26 27.42x31 26x37 28.41x32 2-7 29.28x17 11x22 30.29-24 19x30 31.25x34 6-11 32.46-41 11-16 33.41-37 14-19 34.40-35 16-21 35.34-29 The inner logics of this type of positionis to push the opponent towards the corner by attack at a veryinconvenient tempo situation with ...1923 black or 3228 for white andthen use the columns from rare to take the vital squares in thecenter. Importance is the difference in tempi between the opponents,because more tempi can compensate for such a deviation, but lesstempi in such a situation can be more harmful. It is also importantwhether both the opponents have column 48, 42 and 37 for white andsimilar for black, because such a column can give an opportunity tocontrol square 27 also using 3731 and so on, since the attack ...2126is of no danger for white. Another importance is column 44, 39 and33, because after white is pushed by attack towards corner, it canstill counteract against black play for center, using such a column.Thus, there are several positional elements around these types ofpositions. 19-23 Absolutely unnecessary to attack, if ...1823after that is not effective. Black just gives tempi away (just acouple though...) with no gain. It was more common to play somethinglike:
[ 35...21-26 36.32-28 9-14 37.28x17 12x21 38.33-28 4-9 39.39-33 8-12 40.29-24 19x30 41.35x24 14-19 and so on, justpushing white back with small advantage in tempi; that's all what onecan do in such equal positions. ]
36.48-42 23x34 37.39x30 22-28?? The young guy is just exhausted mentally in such a hopeless matchsituation, just subdued in a battle. He only notices capture on oneside, having been playing on his seconds again. He could go on withkeeping more or less balanced position after:
[ 37...13-19 38.37-31 (38.30-24 19x30 39.35x24 18-23=; 38.32-28 21-26 39.28x17 12x21 40.37-32 9-14 with a parity.) 38...21-26 39.31-27 22x31 40.36x27 12-17 41.33-28 18-22 (41...19-23 42.28x19 17-22 43.27-21 26x17 44.30-25 7-12=) 42.27x18 26-31 ]
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(11) Groenendijk,J. (Jan) - Boomstra,R.P. (Roel)
World Title match, 16-12-2016


1.34-29 20-25 2.40-34 14-20 3.44-40 10-14 4.32-28 17-21 avoiding 2x2 with corner piece remaining for black. 5.31-26 19-24 Roel can afford now to play interesting, because the result of thematch is clear. In any other situatin, I guess, he should have chosen5.... 0510 with a double capture, provoking white for losing another4 tempi after 2924. 6.26x17 11x22 7.28x17 12x21 8.37-32 18-22 It is understandable on Roel's part to attempt to shorten a number ofpieces in line 4, 9, 13, 18, which is often too long to objectivelyplay against white center, but in this way he develops white leftwing and gives away 4 tempi. May be it was worth trying:
[ 8...21-26 9.32-28 7-11 10.36-31 26x37 11.41x32 2-7 and so onkeeping game via 22 open. Indeed black can't completely control whitecapture 2x2 by means of 3430 forever, if white is strong enough. ]
9.32-28 22-27 10.38-32 27x38 11.43x32 7-12 12.42-38 21-26 13.47-42 13-18 14.36-31 26x37 15.42x31 9-13 16.41-37 18-22 17.28x17 12x21 18.32-28
[ 18.31-26?! 1-7 19.26x17 7-12 andblack feels more free on his short wing than in the game. ]
18...21-26 19.31-27 5-10 20.49-43 4-9 21.50-44 6-11 22.46-41 2-7 23.38-32 14-19 After this move, which looks like development ofthe black long wing, white controls the position by means of threats.Less dircet would have been:
[ 23...11-17 24.43-38 (24.28-23 7-12 25.23-19 14x23 26.29x7 1x12 27.43-38 17-21 28.48-43 12-18 29.41-36 9-14 30.34-30 25x34 31.39x19 14x23=) 24...17-21 25.27-22 14-19 26.29-23 9-14 27.34-29 7-12 28.41-36 1-6 29.40-34 12-17 30.22x11 6x17 31.45-40 17-22 32.28x17 21x12 33.36-31 19x28 34.32x23 12-18 35.23x12 8x17 with more or less of a parity. ]
24.43-38 10-14 25.48-43 7-12 Black accepts simplifications, whichoften come with initiative for white, but in this case black has stila solid position, in spite of some weakness of his short wing.
[ 25...8-12? 26.41-36 12-18
A) 27.28-23! 19x28 28.32x12 7x18 29.35-30 24x35 30.29-24 20x29 31.34x12 11-17 32.12x21 26x17 33.38-32 with someadvantage for white.
B) 27.36-31? 7-12 28.28-23 19x28 29.32x23 11-17 30.34-30 25x34 31.39x10 15x4 32.33-28? (32.23-19!? 13x24 33.35-30 24x35 34.29-23 18x29 35.33x15 12-18 with a serious advantage for black.; 32.35-30? 20-24 33.30x8 17-21 34.8x17 21x41 35.23x12 26x37 x) 32...1-7! x ]
26.37-31 26x46 27.27-21 16x27 28.32x21 46x23 29.29x16 13-18 30.38-32
[ 30.16-11 9-13 31.34-30 25x34 32.39x30 8-12 33.44-39 18-22 34.11-7 12-18 35.21-16 (35.7-2?? 22-28 36.33x22 18x16 x) 35...1x12 36.16-11 22-27 with adraw, but white has to force it, not black. ]
30...9-13 31.34-29 8-12 32.32-28 1-7 33.43-38 7-11 34.16x7 12x1 35.38-32 3-9 36.40-34 1-7 37.45-40 18-22 38.28x17 19-23 39.29x18 13x11 40.21-17 Clearly played for a draw. But probably there is not muchmore on the board for white:
[ 40.33-29 24x33 41.39x28 14-19 42.28-22 9-13 43.34-29 20-24 44.29x20 15x24 45.21-17 11-16 46.44-39 13-18 47.22x13 19x8 48.32-27 7-12 49.27-21 16x27 50.17-11= ]
[ 40.33-28 9-13 41.32-27 7-12 42.21-16 13-18 43.16x7 12x1 44.27-21 14-19 45.21-17 1-6 46.39-33 18-23 47.17-12 23x32 48.33-28 32x23 49.12-8 23-28 (49...23-29 50.34x14 20x9 51.40-34 15-20 and small combination with a draw after white nextmove with piece 44.) 50.8-3 ]
40...11x22 41.33-29 24x33 42.39x17 20-24 43.44-39 14-20 44.32-27 7-12 Black forces a drawin 4 against 2 position.
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(12) Boomstra,R.P. (Roel) - Groenendijk,J. (Jan)
World Title match, 17-12-2016


1.33-29 17-21 2.39-33 21-26 3.44-39 11-17 4.50-44 6-11 5.32-28 17-21 6.38-32 12-17 Roel obviously hopes for his well analyzedvariation, in which he could feel safe, leaving his opponent unawareon how deep he has analyzed the scheme:
[ 6...20-24 7.29x20 15x24 8.43-38 18-23 9.49-43 10-15 10.31-27 14-20 11.27-22 24-29 12.33x24 20x29 13.34-30 ]
7.28-23 19x28 8.32x12 7x18 9.35-30 20-25 10.42-38 17-22 11.47-42 1-6 This is possible. But may be itwas worth considering the following variant, in which black has someinitiative:
[ 11...21-27 12.29-23 (12.29-24?! 16-21 13.33-28 22x33 14.31x22 18x27 15.39x28 11-16 16.37-31 26x37 17.42x22 13-19 18.24x13 9x27 19.28-23 14-19 20.23x14 10x19 with blackinitiative.; 12.30-24 1-6 13.33-28 22x33 14.31x22 18x27 15.39x28 26-31 16.37x26 16-21 17.26x17 11x33 18.24-20 15x24 19.29x20 14-19 20.38x29 25x14 no problem for black.) 12...18x29 13.34x23 25x34 14.39x30 1-6 15.43-39 14-19 16.23x14 10x19 17.33-28 22x33 18.38x29 19-23 19.29x18 13x22 20.42-38 21.3833 and 22.3328= ]
12.31-27 22x31 13.36x27 21x32 14.37x28 18-22 15.28x17 11x22 16.41-37 16-21 17.37-32 14-19 18.40-35 10-14 19.44-40 21-27?! I would have opted for losing of less tempi than inthe game after 19.... 0611 20.3228 1116, and keeping strategicallyimportant piece 26 in place. In cases when white doesn't have fullcolumn: 37, 42, 48 and white is not ahead in tempi, then blackconfiguration of 2 pieces: 26 and 22 can be very strong to block thewhole white long wing. 20.32x21 26x17 21.42-37 17-21 22.38-32 8-12 23.30-24 19x30 24.35x24 12-17? Practically after this movefrom the game black splits his position in 2 parts, which can't beglued properly together anymore and moreover - it can't be combinedwith column 2,8,13. Besides black has piece 5, still to be developed,and he is behind in tempi. Now black can only build structures fordefence. It was fundamentally better to build in a logical way:
[ 24...6-11 25.49-44 (25.46-41 11-17 26.43-38 3-8 27.32-28 14-20 28.41-36 5-10 29.28-23 13-18 30.48-43 9-13 31.40-35 4-9 32.38-32 9-14 33.43-38 21-27 34.32x21 17x26 35.45-40 13-19 36.24x13 8x28 37.37-31 26x37 38.29-24 20x29 39.34x41 with adraw, but black has initiative on account of the tempi advantage.) 25...11-17 26.33-28 22x33 27.29x38 and black is well developedand tempi are equal, besides if black decides, then exchange 1319should give him another 4 tempi. ]
25.46-41 6-11 26.32-28 11-16 27.43-38 21-26 26 is important square for black now, not to getinto real trouble. Counter game of black is linked with the notionthat white in no way should get control of square 27 at an earlystage. 28.38-32 2-7 29.49-43 7-11 30.43-38 14-20 31.41-36 16-21 Jan attempts to prohibit both white wings from coming into acompact monolith, but his damaged structure doesn't secure him tokeep it for long 32.37-31 26x37 33.32x41 11-16 34.41-37 13-18 with a threat 35... 1823, but in case of 35.2823? 0913 and whitestart experiencing some inconvenience on account of lack of column44, 39,33. 35.37-32 9-13 36.48-42 5-10 37.42-37 21-26 38.40-35? Surely the move from the game is not an essential mistake, but itdelays the white activity. It was better to push black backimmediately:
[ 38.28-23! 17-21 39.23x12 21-27 40.32x21 26x8 41.37-31 16-21 42.38-32 21-26 43.31-27 22x31 44.36x27 8-12 45.33-28 10-14 46.28-23 14-19 47.23x14 20x9 48.39-33 with adrawn position, but black is much behind in tempi and he has to findthe right way for sacrifice to break through with piece on 26. ]
38...10-14 39.37-31 26x37 40.32x41 16-21 41.41-37 14-19 with agoal to activate black piece on square 4. 42.37-31 19x30 43.35x24 4-10 44.45-40 10-14 45.38-32
[ 45.28-23 3-9 46.23x12 17x8 Blacknow has shifted for 2 attacks against 1 defence on white short wingto secure a draw: 47.38-32 21-26 48.31-27 22x31 49.36x27 14-19 50.40-35 19x30 51.35x24 9-14 52.33-28 14-19 53.28-22 19x30 54.32-28 8-12 55.27-21 26x17 56.22x11 20-24 57.29x20 15x24= ]
45...21-26 46.31-27 22x31 47.36x27 3-9 48.28-23 18-22 49.27x18 13x22 50.23-19 14x23 51.29x27 20x38 52.32x43
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