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Per Thoren vs Vadim Z Faibisovich
SWE-chT 9899 (1998), Sweden, rd 7
Sicilian Defense: Kan. Polugaevsky Variation (B42)  ·  0-1

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Aug-24-08  4tmac: Interesting ending from move 56 on. White must put his B on B3 but his K is on the wrong side of the Bishops. It must be in "that" corner area. Surprisingly, lacking that, white can draw by keeping the pawn. Whites last chance was 59. Kc4+! getting as close to "the position" (given in the diagram) as possible---mate in 71.


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Feb-18-09  WhiteRook48: 79. Kf1 Kd3 80. Kf2 Qe2+ and white has only the hope that Black will blunder his Queen after taking his DSB
Jul-31-10  Zkid: I thought that 56. f5? seemed silly - why just give away the pawn? It turns out that white's only chance to draw is 56. Be5! saving the pawn, according to the tablebase - e.g. after 56... Qc1+ 57. Kd3 Kf3 58. Bb3(or Kc3) the secure position of the bishop on e5 is enough to ensure a draw. Even if this wasn't enough (and I certainly couldn't have figured out on my own if it was) why give away the pawn? Must've just been a blunder.
Sep-06-11
Premium Chessgames Member
  kevin86: I had always thought that the bishops could hold off the queen,but the power of zugzwang can allow a breakthrough.
Oct-29-17
Premium Chessgames Member
  Bubo bubo: <kevin86: I had always thought that the bishops could hold off the queen>

You are in good company, as this was the common assumption about this endgame in the pre-computer era. Now tablebases confirm that the queen wins in most cases. However, some positions are a draw thanks to the 50-move-rule, and there is one virtually impenetrable fortress, due to Giambattista Lolli :


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