World championship 2013 preliminaries round 6

Chizhov - Samb 2-0
Alexey Chizhov - NDiaga Samb 2-0

The move 8-13? was a positional mistake. Chizhov reacted with 32.30-24! This disturbs the normal black development 18-22? with 33.24-19 13x24 34.23-18 12x34 35.39x10 W+   3-8 33.42-37 20-25 34.39-34! Still 18-22? is not possible   17-21? After this move the black position is lost. With the problematic   14-20 35.36-31 18-22 (not   9-14? due to 36.43-39 14-19 37.23x14 20x9 38.31-27! and all black moves are losing)   36.32-27 13-19?! 37.23x3 2-7 38.27x18 12x41 39.3x1 26x37 black could fight for a draw.   35.43-39 21-27 36.32x21 26x17 37.38-32 17-21 38.45-40! It is important that the piece sacrifice 15-20? 39.24x15 13-19 does not work due to 40.15-10! 4x15 41.29-24 18x27 42.24x4 W+   2-7 39.36-31 15-20 40.24x15 13-19 41.31-26 21-27 42.32x21 19-24 43.29x20 18x38 44.28-22 8-13 45.22-17 4-10 and black resigned.

Boomstra - Artykow 1-1
Roel Boomstra - Alisher Artykow 1-1

The black left wing is already dangerously weak, but when Artykow played 9-13? the situation became critical for him. 30.33-29! 24x33 31.38x29 Perhaps Artykow did not anticipate 13-19? 32.29-23! 18x40 33.27-22 17x28 34.32x14 W+   17-21 32.29-24 18-23 33.34-30 In the game Boomstra chooses to make a king as fast as he can. But in the mean time his opponent organizes an unexpected defense. Looking back, it would have been better to disturb the black plans, before making a king. 25x34 34.24-20 34-40 35.20-15? It was better to play   35.42-38. Then the black response 13-18 is very unattractive due to 36.38-33!   13-18! 36.47-41 23-29! 37.15-10 11-17 Black has built a capture position to prevent white from making a king. But that is not all: he has also managed to take control of the white right wing with the strong pieces on 29 and 40. 38.42-38 18-23 39.41-36 After   39.43-39 black can play 29-34 40.39x30 40-44 41.50x39 23-28 42.32x23 21x25. Still white has good opportunities to win.   12-18 40.37-31 29-33 41.38x29 23x34 42.31-26 8-13 43.36-31 2-8 White has no perspective for a win anymore, and so Boomstra made a draw with 44.50-44 40x38 45.32x43 21x32 46.43-38 32x43 47.48x30

Ivanov - Tolchykau 2-0
Artem Ivanov - Andrei Tolchykau 2-0

Ivanov surprised his opponent with 15.41-37! Now 21-26? 16.32x21 23x41 fails due to 17.35-30 26x17 18.29-24 20x29 19.34x1 41-46 20.40-35 17-22 21.43-39 and black has to sacrifice a piece with 22-28 22.33x22.   11-16 16.28-22 27-31 17.37x17 18x27 18.32x21 16x27 19.29x18 13x11 20.44-39 8-12 21.42-37 9-13 The black position is a little uncomfortable due to the undeveloped piece on 5, and the vulnerable outpost on 27. 22.33-28! 5-10 23.37-31 12-18 24.31x22 18x27 25.35-30! White grabs the opportunity to take control of square 25. Black has no time to play 20-25? due to 26.38-33 W+   13-18 26.30-24 19x30 27.34x25 18-22 28.28x17 11x22 29.48-42 6-11 30.50-44 11-17 31.38-33! 17-21 32.33-28! White takes control of the center again. while black is stuck with an undeveloped left wing. 22x33 33.39x28 20-24 34.43-38 4-9 35.42-37 21-26 36.44-39 9-13 37.49-44 3-8 38.39-33 8-12 39.44-39 7-11? Probably this is already the decisive mistake. 40.28-23! 11-16 41.47-42 12-17 42.40-35 17-21 43.37-32! Black had put his hopes on   43.23-18? 13x22 44.39-34 since then he can rescue himself using 15-20! 45.34-30 24-29! 46.33x4 22-28 47.4x31 28-32 48.38x27 21x41 49.36x47 26x48.   15-20 44.42-37 10-15 45.33-28 14-19 46.25x14 19x10 47.39-33 15-20 48.28-22 27x29 49.35-30 24x35 50.33x4 13-19 51.4-10 and Tolchykau resigned. An impressive win by Ivanov!

Mariko - Schwarzman 0-2
Mamoutou Mariko - Alexander Schwarzman 0-2

Mariko became the victim of a trap that was set up for him by his opponent. After the logical 38.34-29? Schwarzman played 18-22! 39.29x20 25x14 Now white can not defend the piece on 32 with 40.49-43? due to the combination 21-27 41.32x12 3-9 42.28x17 13-18 43.12x23 19x50 B+ And so white lost a piece and the game after   40.44-39 22-27 etc.

Watoetin - Nossov 1-1
Watoetin Evgueni - Nossov Yurij 1-1 (2013)

When Nossov played 2-8?! Watoetin could take a combination with 34.28-22! 18x27 35.38-32 27x49 36.34-30 49x24 37.29x7. However, after 6-11! 38.7x27 19-24 39.48-43 24-30 40.43-39 30-35 41.39-34 15-20 42.27-22 20-25 43.22-17 25-30 44.34x25 35-40 the result is a draw.

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