Author: Robin Smith
Date: 14:33:12 09/21/01
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On September 21, 2001 at 11:43:50, Simon Finn wrote: >On September 20, 2001 at 21:08:07, Robin Smith wrote: > >>On September 20, 2001 at 13:00:17, Roy Eassa wrote: >> >>>On September 19, 2001 at 01:10:00, Robin Smith wrote: >>> >>>>Can any programs solve this ending? >>>> >>>>[D] k7/8/4p3/7P/8/3P4/1Bb4P/K7 w - - 0 1 >>>> >>>>Kazantsev, 1950 study >>>> >>>>Solution: 1.Bh8! >>> >>> >>>Could somebody please explain why Bh8 is the only way to win? What's the >>>winning plan? >> >>Black has a strong defensive plan. If black gets his king in front of the >>h-pawns, blockading them, and his bishop to a square that defends the e-pawn, >>white will not be able to make progress. So white MUST prevent this. >> >>The only way to prevent this defensive plan is to get the white king to g7 as >>quickly as possible, keeping black's king away. Thus the first moves of the >>main line go: >> >>1.Bh8! Kb7 2.Kb2 Bxd3 3.Kc3 Bf5 4.Kd4 Kc6 5.Ke5 Kd7 6.Kf6 Ke8 7.Kg7 >> >>Once white has the king on g7, the next step is to march the forward h-pawn up >>the board, threaten to queen, and force black to give up his bishop for it. >>White then queens the remaining h-pawn. Meanwhile white's bishop prevents black >>from queening the e-pawn. > >So why doesn't 1. Bc1 also work? > >1. Bc1 Bxd3 2. Kb2 Kb7 3. Kc3 Bb1 4. Kd4 Kc6 5. Ke5 looks winning. > >Black can try to block the White king's progress with ...e5, but >White can just go round the pawn: > >1. Bc1 Bxd3 2. Kb2 e5 3. Kc3 Bb1 4. Kc4 Kb7 5. Kd5 also looks sufficient. > >So what am I missing? > >Simon I think after 1.Bc1? Bxd3 2.Kb2 e5 3.Kc3 Be4! (controlling the d5 square) and white cannot break through. Robin
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