Author: Robert Hyatt
Date: 20:19:12 02/28/01
Go up one level in this thread
On February 28, 2001 at 13:48:00, Sune Larsson wrote: >On February 28, 2001 at 13:00:53, Robert Hyatt wrote: > >>On February 28, 2001 at 11:12:09, Sune Larsson wrote: >> >>> >>> [D]4n3/1b3k1p/p2p2p1/3Pp3/2P3P1/6PP/2BB4/6K1 w - - 0 1 >>> >>> This is Hort-Ciocaltea, Budapest 1973. Only two moves are required >>> to immobilize the black knight and pave the way for the victorious >>> march of the white king to the deserted queenside: >>> >>> 1.g5! Bc8 2.g4! and black's position is ripe for resignation. >>> >>> Test: The above move order should be rewarded with big +scores for white. >>> >>> Sune >> >> >>There may be more than one winning plan here. Crafty thinks that Ba5 wins a >>pawn, for example... eval = +1.26 after 18 plies, almost 2 minutes: >> >> 17 1:01 0.99 1. Ba5 Ke7 2. Kf2 Bc8 3. Kf3 Bd7 4. >> Ke4 Kf6 5. Bb4 Nb6 6. Bd3 Nc8 7. c5 >> dxc5 8. Bxc5 a5 9. d6 >> 17-> 1:09 0.99 1. Ba5 Ke7 2. Kf2 Bc8 3. Kf3 Bd7 4. >> Ke4 Kf6 5. Bb4 Nb6 6. Bd3 Nc8 7. c5 >> dxc5 8. Bxc5 a5 9. d6 >> 18 1:40 1.26 1. Ba5 Ke7 2. Kf2 Bc8 3. Kf3 Bd7 4. >> Ke4 Kf6 5. Bb3 h5 6. Bb4 hxg4 7. hxg4 >> Ke7 8. c5 dxc5 9. Bxc5+ Kf6 10. g5+ >> Kxg5 11. Kxe5 >> 18-> 1:53 1.26 1. Ba5 Ke7 2. Kf2 Bc8 3. Kf3 Bd7 4. >> Ke4 Kf6 5. Bb3 h5 6. Bb4 hxg4 7. hxg4 >> Ke7 8. c5 dxc5 9. Bxc5+ Kf6 10. g5+ >> Kxg5 11. Kxe5 > > Interesting line. Can Crafty win the above position after 11.-Kg4? > > Sune Good question. A brief note about chess programs. When they produce a PV as above, the first move is the one they play. The second move is the one they expect, but it is less accurate as it is the result of a search that is one ply shallower than the search to choose the _first_ move. By the time you reach the end of the PV, it is _highly_ likely that those moves will never be played in a real game. The last move is based on a 1 ply search, for example, and no one would consider that to be reasonable chess... IE when a GM gives me a variation to look at, _every_ move generally is a sound move. When a computer gives me a variation, the deeper the move in the variation, the less likely it is to be the best move.
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