World championship 2013 preliminaries round 4

Amrillaew - Dul 1-1
Mourodoullo Amrillaew - Erdenebileg Dul 1+-1

Amrillaew has a significant advantage against Dul, but positions like these are difficult to win. 13-18? This is losing. It was better to play   17-22 52.29-23 9-14 53.36-31 (here   53.32-27 22x31 54.36x27 15-20 55.24x15 13-19 also leads to a draw)   14-20! 54.34-29 25-30! 55.24x35 20-24 56.29x20 15x24 and white cannot win.   52.32-27 17-22 53.27-21? The winning move was   53.24-19! 22x31 54.36x27 9-14 55.19x10 15x4 56.27-21! (Since   56.33-28? leads to a miraculous draw after 12-17 57.29-24 4-10 58.24-19 10-15 59.19-14 15-20 60.14-10 20-24 61.10-5 24-30 62.34-29 30-35 63.29-24 35-40! etc.)   18-22 57.29-23 4-10 58.33-29 12-17 59.21x12 22-27 60.12-8 with a winning endgame for white.   9-13 54.33-28 22x33 55.29x38 18-23 56.38-32 13-18 57.32-27 25-30! 58.34x25 23-28 59.21-16 12-17 60.25-20 28-33 61.20-14 17-21 62.14-9 21x32 63.9-4 33-38 64.4x31 38-43 65.31-48 43-49 66.24-19 49-35! 67.19-14 15-20! 68.14x25 32-38 69.36-31 This is needed because of   69.16-11? 35-8! 70.11-7 8-26! etc.   35-13 70.31-26 13-22 and the players agreed to a draw.

Derival - Schwarzman 0-2
Derival Nicolas - Schwarzman Alexander 0-2 (2013)

With an ingenious piece sacrifice Schwarzman took the initiative: 20-24! 23.29x20 19-23 24.48-43 12-17 25.32-28 23x32 26.38x27 17x28 27.42-38 21x32 28.38x27 28-33 The number of pieces is equal again, but black clearly has an advantage now. The white pieces on 20 and 25 are very passive, and the black outpost on 33 hampers the white development in the center. 29.37-31 26x37 30.41x32 5-10 31.47-42(?) By giving up the possibilty to make the forward exchange   43-38, white will have problems to get rid of the piece on 33.   11-17 32.40-35 17-21 33.46-41 13-18 34.20-15 8-13 35.41-37 18-23 36.45-40 10-14 37.43-39? Finally white manages to remove the piece on 33. But Schwarzman was prepared for that. 33x44 38.40x49 13-19! 39.37-31 Since   39.27-22? is not possible due to 14-20 40.15x13 9x47 B+.   21-26! and after the desperate move 40.15-10? 26x28 41.10-5 black decided the game with 14-20 42.25x14 19x10 43.5x19 23x14 etc.

© Wieger Wesselink http://10x10.org