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Vladimir Potkin vs Daniele Vocaturo
Tata Steel Group B (2012), Wijk aan Zee NED, rd 5, Jan-19
Queen's Gambit Declined: Ragozin Defense (D38)  ·  1/2-1/2

ANALYSIS [x]

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Kibitzer's Corner
Jan-19-12  gazzawhite: Black was winning up until move 83.

83...♘g5?? fails as, in getting the knight to g3, white has enough time to infiltrate the e8-h4 diagonal.

Instead, 83...h5! wins, as white cannot get to the e8-h4 diagonal in time, while black still has enough time to get his knight to g3. e.g. 84.♔b4 ♘h6 (not 84...♘g5? 85.♔c4 ♘e4 86.♔d3 ♘g3 (86...♔f3 87.♗h4) 87.♔e3 h4 88.♔f2 h3 89.♔g1) 85.♔c4 ♘f5! (Covering g3 and h4) 86.♔d3 ♔f3 87.♗a5 h4 88.♗c7 ♘g3 89.♗b6 ♔g2 and black queens.

Jan-19-12  SuperPatzer77: <gazzawhite> Yeah, I completely agree with you. Daniele Vocaturo blew a win big time with 83...h5!! and 84...Nh6 and then 85...Nf5! (covering g3 and h4 and blockading the White bishop on g3 by allowing Black h-pawn to go queening.

SuperPatzer77

Jan-19-12  SuperPatzer77: Black to move and win - see diagram below:


click for larger view

83...h5!, 84. Kb4 Nh6, 85. Kc4 Nf5! (covering g3 and h4 and blockading the White bishop on g3 with the Black knight to allow the Black h-pawn to advance), 86. Ke3 Kf3, 87. Ba5 h4, 88. Bc7 Ng3, 89. Bb6 Kg2 (the unstoppable Black h-pawn goes queening)

Daniele Vocaturo has missed a big win with 83...h5! and eventually drew his opposing player.

SuperPatzer77

Jan-20-12  SuperPatzer77: Addition to my previous analysis below:


click for larger view

Black to move and win

83...h5!, 84. Kb3 Nh6, 85. Kc2 Nf5!, 86. Kd1 Kf3!, 87. Ba5 (only move) h4, 88. Bc7 Ng3 - See diagram below:


click for larger view

a) 89. Bxg3 hxg3 (89...Kxg3, 90. Ke1 Kg2 ), 90. Ke1 g2

b) 89. Ke1 h3, 90. Bxg3 Kxg3, 91. Kf1 h2

SuperPatzer7

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