Author: Robert Hyatt
Date: 09:04:39 04/01/04
Go up one level in this thread
On March 31, 2004 at 23:15:56, Slater Wold wrote: >On March 31, 2004 at 22:35:50, Robert Hyatt wrote: > >>On March 31, 2004 at 11:09:26, Mihaly Szalai wrote: >> >>>From the game Chekhov - Sorokin, Protvino,1988. >>> >>>[D]5k2/6p1/2p5/2P2PKP/3B4/1b6/1P6/8 w - - 0 52 >>> >>>White is two pawns up but there are opposite color bishops. >>>Both 52.f6 and 52.h6 are bad, however 52.Bxg7! wins. >>> >>>You should show it to your engine, I'm sure that quite a few >>>will find it. >>> >>>Thanks >>>Mihaly >> >> >>Takes Crafty about two seconds on my dual xeon to find the move, about a half a >>minute to see a winning score: >> >> 19 39.63 +1 1. Bxg7+!! >> 19 42.46 +3 1. Bxg7+!! >> 19 49.90 2.95 1. Bxg7+ Kxg7 2. f6+ Kh7 3. Kf4 Kh6 >> 4. Ke5 Kg5 5. Kd6 Kxf6 6. Kxc6 Ke6 >> 7. h6 Bd5+ 8. Kb6 Kf6 9. c6 Be6 10. >> Kb7 Bd5 11. b4 Ke5 (s=8) >> 19-> 1:21 2.95 1. Bxg7+ Kxg7 2. f6+ Kh7 3. Kf4 Kh6 >> 4. Ke5 Kg5 5. Kd6 Kxf6 6. Kxc6 Ke6 >> 7. h6 Bd5+ 8. Kb6 Kf6 9. c6 Be6 10. >> Kb7 Bd5 11. b4 Ke5 (s=7) > >I take it you've made some changes? > >What is that +1 & +3?? That is in the most recently released version I think. It fails high (or low) in steps. +1 means expectation is winning a pawn, +3 is winning a piece, +M means beta was relaxed to + infinity (probably mating)...
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