Seaport Masters 2012 round 5

Schwarzman - Borghetti 2-0 (2012)
Schwarzman - Borghetti 2-0 (2012)

Earlier in the game Borghetti voluntarily accepted a weak piece on 20, and because of this weakness he must be very careful now. 1-7? It was necessary to play actively with   11-17! 44.38-32 18-23! 45.27-22 (or   45.37-31 1-6(!) 46.31-26 13-18! 47.27-21 23-29 48.21x14 29x49 =)   17x28 46.33x22 24-29! 47.44-40 20-24 48.22-17 1-7 49.37-31 29-33 50.39x28 24-30 51.35x24 19x39 52.28x8 39-43! with a draw   44.38-32! 18-23? 45.27-22! Now the black position is lost. 11-16 46.22-17 7-12 47.17x8 13x2 48.32-27(?) Schwarzman plays the right moves, but in the wrong order. It turns out that black had the possibility to escape using a piece sacrifice 2-8 49.37-31 8-13 50.31-26 25-30! 51.34x14 19x10 52.44-40 10-15 53.27-22 15-20 and white can't win. However, it would require extraordinary skills of a black player to find this opportunity.   2-7? 49.37-31 7-12 50.31-26 12-17 51.44-40! White has the last tempo, and thus black needs to sacrifice a piece now. 25-30 52.34x14 19x10 53.27-22 17x28 54.33x22 10-15 55.22-17 23-28 56.17-12 28-32 57.12-7 32-37 58.7-2 37-41 59.2x30 41-46 60.30-13 46-23 61.39-34 15-20 62.13-36 23-12 63.36-47 20-25 64.47-41 12-3 65.41-36 3-20 66.36-47 20-3 67.34-29 3-17 68.40-34 17-12 69.47-33 12-18 70.33-28 18-13 71.29-23 13-2 72.28-50

Georgiev - Shaibakov 1-1 (2012)
Georgiev - Shaibakov 1-1 (2012)

Although his right wing is weakened by it, Georgiev chose to attack with 22.34-29! 23x34 23.40x29 19-23 24.28x30 25x23 25.39-34! 13-19(?) 26.34-30! White takes advantage of the fact that 20-25? is prevented by the sneaky 27.27-22! 25x34 28.22-18! and white wins a piece.   8-13 27.30-25! The piece on 25 obstructs the black left wing severely. 20-24 28.43-39 11-17 29.33-28! 24-29!? A very risky attack. But it was not so easy for black to find a better plan. First of all   12-18? was prevented by the combination 30.16-11 7x16 31.27-21 16x27 32.32x12 23x34 33.12x3 W+. The safest plan for black was probably   9-14 30.27-21! 13-18 (here   15-20 31.36-31 13-18 32.39-33 6-11 33.45-40 1-6 34.31-27! 2-8 35.40-35! 17-22 36.28x17 11x31 37.21-17 12x21 38.16x36 is better for white due to the weak piece on 20 )   31.36-31 2-8 32.31-27 17-22 33.28x17 8-13 34.17x8 13x2 35.16-11 7x16 36.21-17 and black can save himself with 2-7! 37.17-12 (and not   37.17-11? 6x17 38.27-21 16x27 39.32x12 due to 18-22! 40.12-8 7-12 41.8x28 23x34 B+)   7-11 38.12-8 16-21 39.27x7 1x3 with an equal position.   30.27-22! 6-11 31.45-40 9-14 32.36-31! 15-20 (not   12-18? because of 33.25-20 18x36 34.20x18 23x12 35.28-22 17x28 36.32x14 W+)   33.39-33? This gives black an easy way to force a draw. After   33.40-35! white would quickly win a piece, for example 20-24 34.31-27! 2-8 35.48-43! 1-6 36.47-41 17-21 37.39-33 and the threat 35-30 is decisive.   20-24! 34.31-27 2-8! By bringing the threat 14-20 25x14 19x10 28x30 17x39 into play, white cannot win anymore.   35.27-21 1-6 36.22-18 13x22 37.40-35 29-34 38.33-29 24x33 39.38x27 34-39 40.25-20 14x25 41.28-22 17x28 42.32x14 26x17 43.14-10 39-44 44.10-5 12-18 45.42-38 7-12 46.16x7 12x1 47.5-32 44-49 48.48-43 17-21 49.27x16 18-23 50.32x2 1-7 51.2x11 6x17 52.37-31 17-22 53.31-27 22x31 54.16-11 49-44 55.11-7 44-22 56.7-1 22-13 57.1-34 31-37 58.34-39 13-2 59.38-33 2-13 60.33-28 13-36 61.28-23 36-13 62.39-34 13-2 63.23-18 37-42! A clever way to secure the draw. 64.47x38 2-7 65.34-23 7-2 66.23-34 2-7 and a draw, because a repetition of moves is inevitable.

© Wieger Wesselink http://10x10.org