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Harmen Jonkman vs Ivan Sokolov
Dutch Championship (2002), Leeuwarden NED, rd 1, Jun-20
Four Knights Game: Spanish Variation (C48)  ·  0-1



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Kibitzer's Corner
Nov-13-05  notyetagm: Wow, the winning combination here is very similar to a famous Botvinnik pinning combination. Here Sokolov sacrificed to absolutely pin the White queen to her king along the g-file (36 ... ♗xg2! 37 ♕xg2) and then Black took what the newly pinned White queen no longer defended, the d2-rook (37 ... ♖xd2). Botvinnik created an absolute pin of the White queen to her king on the a8-h1 diagonal by a combination that looked like 1 ... ♕xg2+! 2 ♕xg2 ♖xd2 3 ♕xc6 bxc6.

The common theme is to <sacrifice to create a pin and then exploit the resulting pin by taking what the newly pinned piece no longer defends>.

Dec-17-05  notyetagm: This really is a nice pinning combination by Sokolov, 36 ... ♗xg2! 37 ♕xg2 ♖xd2. Of course he had to see all the way to the end (38 ♕xg6+ ♔xg6 39 ♗f7+ ♔xf7 40 ♖xc8) because <you must not end your calculations without examining your opponent's forcing moves> in the goal position. The net result is that Sokolov is a pawn up in rook ending that Sokolov converts into the full point with ease.
Dec-20-05  EmperorAtahualpa: What is the continuation after 37.Rxd8?
Dec-21-05  crafty: 37. ♖xd8 ♗xh3+ 38. ♔h2 ♖xd8 39. ♖c3 ♗g4 40. ♖d3 ♖xd3   (eval -2.56; depth 14 ply; 100M nodes)
Dec-21-05  EmperorAtahualpa: Thanks <crafty>! In the meantime, I found out that if 37.Rxd8 Bxh3+ 38.Kh2 Rxd8 39.Kxh3??, it loses the rook on c1 because 39...Qg4+ 40.Kh2 Qh5+ Kg3 41.Qg5+ Kh3 42.Qxc1!
Aug-07-10  notyetagm: See 20 ♗c3xg7! in <Salgado Lopez vs Dimitrov World Junior Championship (1) 2010> for another example of the 36 ... ♗e4xg2! <EXCHANGE ON THE PINNING SQUARE> tactic.
Jan-11-11  notyetagm: Game Collection: EXCHANGE ON THE PINNING SQUARE
Feb-20-11  notyetagm: Game Collection: EXCHANGE ON THE PINNING SQUARE: NOT A DEFENDER
Premium Chessgames Member
  plang: 4..Bd6 avoids theory and is not as illogical as it looks. 6..h6 already was new. After 10..0-0 the position resembled an Archangel Ruy Lopez with Black having moved his bishop twice while White had made several "waiting" moves (h3,a3). 12 Nxe5..Nxb3 13 Nxf6+..Qxf6 14 Ng4(14 Nxd7..Qd6) 14..Qe6 15 cxb with Black having good compensation for the pawn. 17 Rxf4 would have been better. 29..f5 would have maintained a small edge for Black as after Sokolov's 29..Qg3?! White missed a clear draw with 30 Bxd5!..Rxd5 31 Rxe4..Rxd2 32 Rxe8+..Kh7 33 Rxd2..Qxc3 34 Ra2. With 34 Rc1? and 35 c4? White walked into Sokolov's nice tactics but by that point he was already worse. 36 Rxd8..Rxd8 37 Bxc4..Qg5! 38 Re1..Rd2 39 Re2..Rd1+ 40 Kh2..Bxg2! 41 Qxg2..Qf4+ 42 Qg3..Rh1+ would also have been winning for Black. 36..Qg5! might have even been stronger winning an exchange.

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