World championship 2013 finals round 8

Roel Boomstra
Roel Boomstra
Boomstra - Ivanov 2-0
Roel Boomstra - Artem Ivanov 2-0

Ivanov had played this position before, in a game with Watoetin. Boomstra was aware of this game, and had prepared an improvement for white in his hotel room. This turned out to be a huge success for him. Instead of 24.31-27 22x31 25.36x27 Boomstra played   24.32-27! 21x32 25.38x27 Clearly this position is dangerous for black. 19-24 26.29x20 15x24 27.42-38! 14-19 28.38-33! 19-23? Interestingly, Ivanov took only 30 seconds for this inaccurate decision, and only 15 minutes for the previous 27 moves. After   2-7! it would be much harder for white to keep control over the position, for example 29.49-44? 9-14! and the threat 16-21 27x16 14-20 25x23 18x40 45x34 forces white to play   30.43-38.   29.39-34! Of course! The black position is completely ruined now, since the necessary 2-7? loses after 30.34-29 23x34 31.33-28 22x33 32.43-39 33x44 33.49x20 etc.   9-14 30.41-37 24-30 Black cannot develop his position with   13-19? because of the combination 31.34-29 23x34 32.33-28 22x33 33.26-21 17x26 34.43-39 33x44 35.49x9 W+   31.34-29! 23x34 32.43-39 34x43 33.25x34 13-19 34.48x39 19-23 35.34-30 14-20 36.30-25 20-24 37.49-43 23-28 38.37-32 28x37 39.31x42 22x31 40.26x37 18-23 41.39-34 12-18 42.33-29 24x33 43.43-38 and black resigned.

Buzinskij - Getmanski 0-2
Edvard Buzinskij - Alexander Getmanski 0-2

Here Getmanski played 24-29 33.33x24 14-20 34.25x14 9x29 35.39-33?? It is unclear what Buzinskij was thinking when he played this move. Obviously his opponent did not intend to give away a piece for free. 16-21! 36.27x7 12x1 37.33x24 18x27 38.32x21 23x41 39.48-43 26x17 40.42-37 41x32 41.38x27 Getmanski has won a piece during this transaction, and this was enough to win the game. 1-7 42.50-44 7-12 43.44-39 12-18 44.30-25 19x30 45.35x24 6-11 46.25-20 3-9 47.24-19 13x24 48.20x29 17-22 49.29-23 22x31 50.23x12 9-13 51.39-33 31-37 52.33-28 37-42 53.28-22 42-48 54.43-38 11-17 55.12x21 48-31 56.22-17 31-26 57.38-32 13-18 58.32-27 15-20 59.21-16 26x12 60.16-11 12-1 61.27-21 18-22 62.21-16 20-24

Atse - Georgiev 0-2
Joel Atse - Alexander Georgiev 0-2

In this position Atse made the mistake 43.31-26? With   43.31-27 22x31 44.36x27 23-29 45.34x23 20-25 46.27-22 25x34 47.22x11 16x7 48.32-27 he could have made a draw.   20-25? But Georgiev did not take full benefit from it. After   13-18! 44.36-31 16-21! the black advantage is decisive, because 45.30-25? loses after 21-27 46.32x12 23x32 47.12x23 19x30 48.25x34 32-38 49.26-21 38-43 50.21-16 43-49.   44.36-31 16-21 45.31-27? Here   45.34-29 23x34 46.30x39 13-18 (or   24-29 47.33x24 22x44 48.45-40 19x30 49.40x49 14-19 50.35x24 19x30 51.31-27 =)   47.39-34 18-23 48.31-27 22x31 49.26x37 was still possible, because after 21-26 white can play the sacrifice 50.34-29 23x34 51.32-27   22x31 46.26x37 23-29! Now the position is winning for black. 47.34x23 25x34 48.33-29 24x22 49.23-18 14-20 50.18x16 34-39 51.32-27 39-43 52.27-22 17x28 53.16-11 43-48 54.11-7 48x26 55.7-2 28-32 56.2-11 19-24 57.11-33 26-48 58.33-22 13-19 59.22-33 32-37

Ndjofang - Dul 2-0
Jean-Marc Ndjofang - Erdenebileg Dul 2-0

After 40.34-29! 11-17 41.29x20 25x14 42.39-34! Ndjofang had a practically winning position. 14-20 43.34-30? White needed to prepare this move with   43.44-39 17-21 44.34-30! Then black does not have the opportunity to play 20-24?, and thus the white attack is decisive.   20-24 44.30-25 18-23 45.25-20 23-29? Here   13-18! 46.20x29 23x34 47.44-39 34x43 48.38x49 15-20 49.33-29 19-24! 50.28-23 24x33 51.36-31 18x29 52.32-28 33x22 53.27x7 20-24! 54.7-2 29-34 55.2x11 6x17 56.31-27 17-22 57.27x18 16-21 was still a draw.   46.27-21! 16x27 47.32x21 6-11 48.35-30! Ndjofang secures the victory with a little combination. 24x35 49.33x24 19x30 50.21-16 15x24 51.16x9 30-34 52.9-4 34-40 53.38-32 40x49 54.28-22 49x18 55.4x6

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