Author: Robert Hyatt
Date: 15:05:57 06/27/02
Go up one level in this thread
On June 27, 2002 at 17:36:59, Ferdinand S. Mosca wrote: >On June 27, 2002 at 17:14:16, Robert Hyatt wrote: > >>On June 27, 2002 at 13:38:32, Ferdinand S. Mosca wrote: >> >>> >>>The king and pawn game is a very interesting exercise to program, is it >>>difficult to perfect this ending?. >>> >>>How long will it take your favorite programs to see that 36. h5 is good for >>>black. >>>[D]8/k6p/8/2P2p2/2P1p3/7K/1P3P2/8 b - - 0 35 >>>sample program analysis on Athlon xp 1600+, 64MB hash >>>Analysis by Gromit 3.8.2: >>> >>>36...h5 37.Kg3 Kb7 38.b3 Kc7 39.b4 Kc6 40.f4 Kc7 41.b5 Kb7 42.c6+ Kb6 43.c5+ Kc7 >>>44.Kh3 e3 45.Kg3 h4+ 46.Kg2 h3+ 47.Kf3 >>> ± (1.09) Depth: 18 00:10:55 >>>36...h5 >>> ± (1.09) Depth: 19 00:10:55 >>>36...h5 >>> ± (1.09) Depth: 19 00:11:09 >>> >>>more than 11 min, and yet the score still favors white. >>> >>> >>>Analysis by Green Light Chess 2.18: >>> >>>36...h5 37.Kg3 Kb7 38.b4 Kc6 39.f4 Kc7 40.b5 Kd7 41.c6+ Kd6 42.Kf2 h4 43.Kg2 e3 >>>44.Kf3 h3 45.Kxe3 h2 46.c5+ Kxc5 47.c7 Kxb5 48.c8Q h1Q 49.Qxf5+ >>> ± (1.27) Depth: 19 00:03:16 154355kN >>>36...h5 37.Kg3 Kb7 38.b4 Kc6 39.f4 Kc7 40.b5 Kd7 41.c6+ Kd6 42.Kf2 h4 43.Kg2 e3 >>>44.Kf3 h3 45.Kxe3 h2 46.c5+ Kxc5 47.c7 Kxb5 48.c8Q h1Q 49.Qxf5+ >>> ± (1.27) Depth: 19 00:03:17 155502kN >>> >>>still favors white. >>> >>>Regards, >>>Dinan >> >> >>takes Crafty 1.5 seconds to lock on to the move, 5 seconds for the score >>to drop below 0.00 (good for black) and 7 seconds to have a -1.5 score for >>black... >> >> >> 12 1.11 3.41 1. ... Kb7 2. Kh4 h6 3. b4 Kc7 4. Kg3 >> h5 5. b5 Kb7 6. c6+ Kb6 7. Kh4 Kc7 >> 8. Kxh5 >> 12 1.52 ++ 1. ... h5!! >> 12 1.65 0.86 1. ... h5 2. Kg3 Kb7 3. b4 Kc6 4. Kh3 >> f4 5. Kg2 h4 6. Kh3 e3 7. Kg2 exf2 >> 8. Kxf2 >> (2) 12-> 1.66 0.86 1. ... h5 2. Kg3 Kb7 3. b4 Kc6 4. Kh3 >> f4 5. Kg2 h4 6. Kh3 e3 7. Kg2 exf2 >> 8. Kxf2 >> 13 1.96 ++ 1. ... h5!! >> 13-> 2.21 0.47 1. ... h5 2. Kg3 Kb7 3. b4 Kc6 4. Kh3 >> f4 5. Kg2 h4 6. Kh3 e3 7. Kg2 exf2 >> 8. Kxf2 >> 14 2.93 ++ 1. ... h5!! >> 14 5.26 -0.28 1. ... h5 2. Kg3 Kb7 3. b4 Kc6 4. Kh3 >> f4 5. Kg2 h4 6. b5+ Kxc5 7. Kg1 e3 >> 8. Kf1 exf2 9. Kxf2 >> 15 6.42 ++ 1. ... h5!! >> 15 7.63 -1.58 1. ... h5 2. Kg3 Kb7 3. b3 Kc7 4. c6 >> Kd6 5. b4 Kxc6 6. c5 Kd5 7. b5 Kxc5 >> 8. Kh4 Kxb5 9. Kxh5 >> 15-> 7.93 -1.58 1. ... h5 2. Kg3 Kb7 3. b3 Kc7 4. c6 >> Kd6 5. b4 Kxc6 6. c5 Kd5 7. b5 Kxc5 >> 8. Kh4 Kxb5 9. Kxh5 >> 16 10.33 -1.87 1. ... h5 2. Kg3 Kb7 3. b3 Kc7 4. c6 >> Kxc6 5. b4 Kd6 6. b5 Kc5 <HT> >> 16-> 10.92 -1.87 1. ... h5 2. Kg3 Kb7 3. b3 Kc7 4. c6 >> Kxc6 5. b4 Kd6 6. b5 Kc5 <HT> >> 17 16.47 -1.73 1. ... h5 2. Kg3 Kb7 3. b3 Kc7 4. c6 >> Kxc6 5. b4 Kb7 6. b5 Kb6 7. Kh4 f4 >> 8. c5+ Kxb5 9. c6 Kxc6 10. Kxh5 > >Hello Bob, > >How do you penalyze a doubled passer (c4)?, or is this a passer at all, and will >get a passer bonus? I thought that this should not be considered a passer. > >Dinan I evaluate them pawn-by-pawn. No real penalty here because of the connected passer pair on the b and c files... Actually, in looking at the code, I only evaluate the most advanced passer on each file for the critical scoring. Each pawn gets some usual positional stuff added in, But then the endgame- specific code only looks at the most advanced passer on each file, since it is the one that is most dangerous...
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