Author: Andrew Williams
Date: 01:00:54 07/21/00
Go up one level in this thread
On July 21, 2000 at 00:27:34, Peter Kappler wrote: > >Grok also shows a draw score at ply 18 with Kc4. > >In another post you stated that Kc4 loses. Are you sure about this? > >--Peter > I *thought* I was. What I did was to play Kc4 followed by h4 and let PM search from there. When I stopped the search, the score was dropping below -1.8 What Paolo says, however, seems convincing. Perhaps I messed up the test I was doing. I'll take another look this weekend. Andrew > >On July 20, 2000 at 05:35:31, Andrew Williams wrote: > >>Thanks for this, Dann. I had an ICC message from Peter McKenzie saying >>that LambChop found Nd8 at depth 16. When I left home this morning, my >>program was still suggesting Kc4 part-way through ply 18. >> >>Cheers >> >>Andrew >> >> >>On July 20, 2000 at 01:02:39, Dann Corbit wrote: >> >>>On July 19, 2000 at 09:33:55, Andrew Williams wrote: >>> >>>>Here is a position that arose in a game on ICC today (PGN below): >>>> >>>>[D] 8/1N6/6p1/2K1k2p/8/1PP5/8/8 w - - acd 11; acn 576768; acs 5; ce 772; fmvn >>>>60; hmvc 0; id "PostModernist vs Tinker"; pm Kc6 ; pv 60. Kc6 h4 61. Nc5 Kf4 62. >>>>Kd5 >>> >>>Intersting that according to crafty, neither of the obvious moves (Nd6, Kc4) >>>have a good outcome. In order to achieve the draw, Nd8 is necessary and it is >>>very, very deep to find it [48 minutes on a PII 350 MHz to find it!]. I think >>>this might be a good test position for deep searching ability. >>> >>>How do commercial engines do on this one? >>> >>>choose from book moves randomly (using weights.) >>>choose from 5 best moves. >>>book learning enabled >>>result learning enabled >>>position learning enabled >>>threshold set to 9 pawns. >>>4 piece tablebase files found >>>1302kb of RAM used for TB indices and decompression tables >>> >>>Crafty v17.11 >>> >>>White(1): st 9999 >>>search time set to 9999.00. >>>White(1): epdpfga epd.epd epd.out >>>PFGA: EPD record: 1 >>>end-game phase >>> clearing hash tables >>> time surplus 0.00 time limit 166:39 (166:39) >>> nss depth time score variation (1) >>> 9 0.84 3.60 1. Nd6 h4 2. Nc4+ Ke4 3. b4 h3 4. Nd2+ >>> Kf4 5. Nf1 g5 6. Nh2 >>> 9-> 1.05 3.60 1. Nd6 h4 2. Nc4+ Ke4 3. b4 h3 4. Nd2+ >>> Kf4 5. Nf1 g5 6. Nh2 >>> 10 1.66 3.21 1. Nd6 h4 2. Nc4+ Kf4 3. Nd2 h3 4. >>> Nf1 g5 5. Kd5 g4 6. Nh2 >>> 10-> 2.23 3.21 1. Nd6 h4 2. Nc4+ Kf4 3. Nd2 h3 4. >>> Nf1 g5 5. Kd5 g4 6. Nh2 >>> 11 2.75 3.25 1. Nd6 h4 2. Nc4+ Kf4 3. Nd2 h3 4. >>> Nf1 g5 5. b4 g4 6. b5 Ke5 >>> 11 4.48 3.47 1. Kc6 g5 2. Nc5 g4 3. Nd7+ Kf4 4. >>> Nf6 h4 5. Nd5+ Ke4 6. b4 h3 7. b5 >>> 11-> 5.19 3.47 1. Kc6 g5 2. Nc5 g4 3. Nd7+ Kf4 4. >>> Nf6 h4 5. Nd5+ Ke4 6. b4 h3 7. b5 >>> 12 8.40 -- 1. Kc6 >>> 12 9.94 2.78 1. Kc6 h4 2. Nc5 Kf4 3. Kd5 h3 4. Ne4 >>> h2 5. Nf2 g5 6. c4 g4 7. c5 >>> 12 10.16 ++ 1. Nd6!! >>> 12-> 13.42 3.17 1. Nd6 >>> 13 15.22 -- 1. Nd6 >>> 13 17.63 0.65 1. Nd6 h4 2. Nc4+ Kf4 3. Nd2 h3 4. >>> Nf1 g5 5. b4 g4 6. b5 g3 7. Nxg3 Kxg3 >>> 13 18.10 ++ 1. Kc6!! >>> 13 26.95 1.29 1. Kc6 g5 2. Kb5 g4 3. Nd8 g3 4. Nc6+ >>> Ke4 5. Nd4 g2 6. Ne2 Kd3 7. Ng1 Kxc3 >>> 8. b4 >>> 13 29.39 ++ 1. Kc4!! >>> 13 30.17 3.08 1. Kc4 h4 2. Nc5 h3 3. Nd3+ Kd6 4. >>> Nf2 h2 5. b4 Kc6 6. Nh1 g5 7. Kd4 g4 >>> 8. c4 >>> 13-> 31.00 3.08 1. Kc4 h4 2. Nc5 h3 3. Nd3+ Kd6 4. >>> Nf2 h2 5. b4 Kc6 6. Nh1 g5 7. Kd4 g4 >>> 8. c4 >>> 14 43.15 3.17 1. Kc4 g5 2. Nc5 g4 3. Kd3 h4 4. Ke3 >>> h3 5. Ne4 Kf5 6. Ng3+ Ke5 7. Nf1 Kd5 >>> 8. Ng3 >>> 14-> 50.36 3.17 1. Kc4 g5 2. Nc5 g4 3. Kd3 h4 4. Ke3 >>> h3 5. Ne4 Kf5 6. Ng3+ Ke5 7. Nf1 Kd5 >>> 8. Ng3 >>> 15 1:08 3.19 1. Kc4 h4 2. Nc5 Kf4 3. Kd3 g5 4. Ke2 >>> g4 5. Nd3+ Kf5 6. Kf2 Ke4 7. c4 h3 >>> 8. Kg3 Kf5 >>> 15-> 1:22 3.19 1. Kc4 h4 2. Nc5 Kf4 3. Kd3 g5 4. Ke2 >>> g4 5. Nd3+ Kf5 6. Kf2 Ke4 7. c4 h3 >>> 8. Kg3 Kf5 >>> 16 1:32 3.25 1. Kc4 h4 2. Nc5 Kf4 3. Kd3 g5 4. Ke2 >>> g4 5. Nd3+ Ke4 6. Nf2+ Kf5 7. b4 g3 >>> 8. Nh3 Ke6 9. b5 Kd5 >>> 16-> 1:56 3.25 1. Kc4 h4 2. Nc5 Kf4 3. Kd3 g5 4. Ke2 >>> g4 5. Nd3+ Ke4 6. Nf2+ Kf5 7. b4 g3 >>> 8. Nh3 Ke6 9. b5 Kd5 >>> 17 2:12 3.48 1. Kc4 h4 2. Nc5 Kf4 3. Kd3 g5 4. Ke2 >>> g4 5. Nd3+ Kf5 6. Kf2 Ke4 7. c4 g3+ >>> 8. Kg2 Kd4 9. c5 Kd5 10. b4 >>> 17-> 2:57 3.48 1. Kc4 h4 2. Nc5 Kf4 3. Kd3 g5 4. Ke2 >>> g4 5. Nd3+ Kf5 6. Kf2 Ke4 7. c4 g3+ >>> 8. Kg2 Kd4 9. c5 Kd5 10. b4 >>> 18 3:28 ++ 1. Kc4!! >>> 18 5:57 4.12 1. Kc4 h4 2. Nc5 Kf4 3. Kd3 g5 4. b4 >>> Kf3 5. Ne4 g4 6. Nd2+ Kf4 7. b5 h3 >>> 8. b6 h2 9. b7 h1=Q 10. b8=Q+ Kf5 11. >>> Qf8+ Ke5 12. c4 >>> 18-> 7:40 4.12 1. Kc4 h4 2. Nc5 Kf4 3. Kd3 g5 4. b4 >>> Kf3 5. Ne4 g4 6. Nd2+ Kf4 7. b5 h3 >>> 8. b6 h2 9. b7 h1=Q 10. b8=Q+ Kf5 11. >>> Qf8+ Ke5 12. c4 >>> 19 9:03 -- 1. Kc4 >>> 19 11:04 3.53 1. Kc4 h4 2. Nc5 Kf4 3. Kd3 h3 4. Ke2 >>> h2 5. Nd3+ Kg3 6. Nf2 g5 7. c4 g4 8. >>> Ke3 Kh4 9. Nh1 Kg5 10. c5 Kf5 11. c6 >>> 19-> 15:58 3.53 1. Kc4 h4 2. Nc5 Kf4 3. Kd3 h3 4. Ke2 >>> h2 5. Nd3+ Kg3 6. Nf2 g5 7. c4 g4 8. >>> Ke3 Kh4 9. Nh1 Kg5 10. c5 Kf5 11. c6 >>> 20 16:54 -- 1. Kc4 >>> 20 24:36 -1.12 1. Kc4 h4 2. Nc5 Kf4 3. Kd3 h3 4. Ke2 >>> h2 5. Nd3+ Kg3 6. Nf2 Kg2 7. b4 g5 >>> 8. b5 g4 9. b6 g3 10. Nh1 Kxh1 11. >>> b7 g2 12. b8=Q g1=Q >>> 20 40:55 ++ 1. Nd8!! >>> 20 79:15 0.00 1. Nd8 h4 2. Nc6+ Ke4 3. b4 h3 4. b5 >>> h2 5. b6 h1=Q 6. b7 Qc1 7. b8=Q Qxc3+ >>> 8. Kd6 Qg3+ 9. Ke7 Qxb8 10. Nxb8 <HT> >>> 20-> 81:01 0.00 1. Nd8 h4 2. Nc6+ Ke4 3. b4 h3 4. b5 >>> h2 5. b6 h1=Q 6. b7 Qc1 7. b8=Q Qxc3+ >>> 8. Kd6 Qg3+ 9. Ke7 Qxb8 10. Nxb8 <HT> >>> 21 84:50 0.00 1. Nd8 h4 2. Nc6+ Ke4 3. b4 h3 4. b5 >>> h2 5. b6 h1=Q 6. b7 Qc1 7. b8=Q Qxc3+ >>> 8. Kd6 Qg3+ 9. Ke7 Qxb8 10. Nxb8 <HT> >>> 21-> 109:53 0.00 1. Nd8 h4 2. Nc6+ Ke4 3. b4 h3 4. b5 >>> h2 5. b6 h1=Q 6. b7 Qc1 7. b8=Q Qxc3+ >>> 8. Kd6 Qg3+ 9. Ke7 Qxb8 10. Nxb8 <HT> >>> 22 119:32 0.00 1. Nd8 h4 2. Nc6+ Ke4 3. b4 h3 4. b5 >>> h2 5. b6 h1=Q 6. b7 Qc1 7. b8=Q Qxc3+ >>> 8. Kd6 Qg3+ 9. Ke7 Qxb8 10. Nxb8 <HT> >>> 22-> 144:37 0.00 1. Nd8 h4 2. Nc6+ Ke4 3. b4 h3 4. b5 >>> h2 5. b6 h1=Q 6. b7 Qc1 7. b8=Q Qxc3+ >>> 8. Kd6 Qg3+ 9. Ke7 Qxb8 10. Nxb8 <HT> >>> time=166:39 cpu=99% mat=3 n=2470367590 fh=3% nps=247041 >>> ext-> checks=218881087 recaps=5807422 pawns=9901037 1rep=3817901 >>>thrt:56281 >>> predicted=0 nodes=2470367590 evals=438265661 >>> endgame tablebase-> probes done=85362 successful=85362 >>> hashing-> trans/ref=1% pawn=0% used=99% >>>White(1): quit
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