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Efim Bogoljubov vs Friedrich Saemisch
Bad Harzburg (1938), Bad Harzburg GER, rd 8, Jul-02
English Opening: Agincourt Defense. Neo Catalan Declined (A14)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Sep-15-08  gambitfan: Again an interesting winning endgame ♕ +♙ // ♕

Let's have look at the final position :


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68 ♕g4+

68... ♔d2 69 ♕f4+ 1-0
68... ♔c1 69 ♕f4+ 1-0

68... ♔c2 69 ♕f5+ 1-0

69... ♔e1 70 ♕e4+ ...

69... ♔f1 70 ♕f4 (♕f5) 1-0

69... ♔d1 (♔d2) 70 ♕d4+ 1-0

The winning character of this endgame is not so obvious !

Sep-15-08  Resignation Trap: <gambitfan> Let's go a little earlier, after 65.h6:


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Black to move

According to Shredder Tablebase, http://www.shredderchess.com/online... , Black's 65...Qg2? was a mistake that allows white to win in 60 with 66.h7!. Instead, Bogo tried 66.Qg5? which allows 66.Qf2+ with a draw. After 67.Ke5+, Black blundered for the last time with 67...Kd1? (67...Kb2 still draws) 68.Qg4+ and the Queens come off.

Sep-16-08  gambitfan: Thank you <Resignation Trap> for your most interesting remark !

Queen endings are real nightmares !

Sep-16-08  gambitfan: In fact, it is not pretty obvious that 65... ♕g2? 66 h7 is a win...

Could you give an explanation ?

Sep-22-08  Resignation Trap: Here's the position after 65...Qg2? 66.h7!:


click for larger view

The most stubborn defense according to tablebases goes: 66...Qf2+ 67.Kg5 Qg3+ 68.Kf6 Qd6+ 69.Kf7 Qc7+ 70.Ke8 Qb8+ 71.Ke7 Qb4+ 72.Kf7 Qb7+ 73.Kg6 Qc6+ 74.Kg5 Qg2+ 75.Kf6 Qc6+ 76.Ke7 Qc7+ 77.Qd7 Qe5+ 78.Kd8 Qh8+ 79.Kc7 (No good checks left!) Kb1 80.Qd3+ Ka1 81.Qa6+ Kb1 82.Qb7+ Kc2 83.Qe4+ Kc1 84.Kd7 Kb2 85.Ke7 Qc3 86.Kf7 Qc7+ 87.Kf6 Qd6+ 88.Kg5 Qd8+ 89.Kg4 Qc8+ 90.Qf5 Qh8 91.Qd7 Kc1 92.Qc7+ Kd1 93.Kh5 Qe8+ 94.Kh6 Qe6+ 95.Kg7 Qg4+ 96.Kf8 Qd4 97.Kf7 Qd5+ 98.Ke8 Qe4+ 99.Kf7 Qd5+ 100.Kd8 Qb6+ 101.Qc7 Qf6+ 102.Kc8 Qa6+ 103.Qb7 Qc4+ 104.Kd8 Qh4+ 105.Qe7 Qh5 106.Qd7+ Kc1 107.Kc8 Qh6 108.Kb7 Qh4 109.Kb8

Black to play.


click for larger view

Only now does it actually become obvious to players who are not of the silicon persuasion! 109...Qb4+ (109...Kb1 110.Qf5+ Ka2 111.Qc2+ and 112.Qc3+ wins.) 110.Qb7 Qd4 111.Qc8+ Kd1 112.h8=Q and wins.

Apr-27-13  bengalcat47: <gambitfan> My favorite book on this subject is Yuri Averbakh's book "Queen and Pawn Endings."
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