Author: Stuart Cracraft
Date: 07:16:46 09/03/04
Go up one level in this thread
On September 03, 2004 at 10:13:35, Michael Henderson wrote: >On September 03, 2004 at 08:57:49, Andrew Platt wrote: > >>Just to show how slippery this position is, I just tried it with Crafty 19.17 >>and it fails to find the mate in ply 9 and now takes a long time to find it: >> >>unable to open book file [./book.bin]. >>book is disabled >>unable to open book file [./books.bin]. >> >>Crafty v19.17 >> >>White(1): ponder off >>pondering disabled. >>White(1): setboard 4r1k1/p1qr1p2/2pb1Bp1/1p5p/3P1n1R/1B3P2/PP3PK1/2Q4R w - - >>White(1): analyze >>Analyze Mode: type "exit" to terminate. >> clearing hash tables >> time surplus 0.00 time limit 22.50 (3:30) >> depth time score variation (1) >> 7 0.26 +1 1. Kf1!! >> 7 0.57 -1.88 1. Kf1 Kf8 2. Bc2 c5 3. dxc5 Qxc5 4. >> Qd2 Qd5 >> 7-> 0.59 -1.88 1. Kf1 Kf8 2. Bc2 c5 3. dxc5 Qxc5 4. >> Qd2 Qd5 >> 8 1.52 +1 1. Kf1!! >> 8 3.41 -0.99 1. Kf1 a5 2. Rxh5 gxh5 3. Rxh5 Re1+ >> 4. Kxe1 Nxh5 5. Qg5+ Kf8 6. Qh6+ Kg8 >> 7. Qxh5 >> 8-> 3.46 -0.99 1. Kf1 a5 2. Rxh5 gxh5 3. Rxh5 Re1+ >> 4. Kxe1 Nxh5 5. Qg5+ Kf8 6. Qh6+ Kg8 >> 7. Qxh5 >> 9 7.75 -0.70 1. Kf1 a5 2. Rxh5 gxh5 3. Rxh5 Re1+ >> 4. Kxe1 Nxh5 5. Qg5+ Kf8 6. Qh6+ Ke8 >> 7. Qh8+ Bf8 8. Qxh5 >> 9 8.59 +1 1. Qxf4!! >> 9 8.98 +3 1. Qxf4!! >> 9 9.80 +M 1. Qxf4!! >> 9 46.31 12.35 1. Qxf4 Be5 2. dxe5 Qd8 3. Bxd8 Rexd8 >> 4. Qf6 Kf8 5. Bxf7 >> 9-> 46.32 12.35 1. Qxf4 Be5 2. dxe5 Qd8 3. Bxd8 Rexd8 >> 4. Qf6 Kf8 5. Bxf7 >> 10 59.13 +1 1. Qxf4!! >> 10 1:12 +3 1. Qxf4!! >> 10 1:32 +M 1. Qxf4!! >> 10 7:05 Mat06 1. Qxf4 Bxf4 2. Rxh5 gxh5 3. Rxh5 Bh6 >> 4. Rxh6 Qh2+ 5. Kxh2 Kf8 6. Rh8# >> 10-> 7:05 Mat06 1. Qxf4 Bxf4 2. Rxh5 gxh5 3. Rxh5 Bh6 >> 4. Rxh6 Qh2+ 5. Kxh2 Kf8 6. Rh8# >>exit 11 7:30 1/6? 1. Qxf4 >>White(1): exit >>analyze.White(1): analyze complete. >> >> >>I'm still not seeing it till ply 12 so mine takes even longer! >> >>Andy. > >my engine, which has only mate threat extension and a captures only qsearch, >also takes 12 plies to find the mate. It sees that Qxf4 is winning at ply 9. I >use R = 2/3. >132 seconds for a 12 ply search. > >setboard 4r1k1/p1qr1p2/2pb1Bp1/1p5p/3P1n1R/1B3P2/PP3PK1/2Q4R w - - bm Qxf4; id >analyze > >1 -101 0 375 g2h2 >2 -121 0 94 g2h2 e8e2 >3 -168 1 1238 g2f1 f4d3 c1c2 >4 -174 1 1589 g2f1 f4e2 c1c2 a7a5 >5 -159 4 14044 g2f1 e8e2 h1g1 a7a5 g1g3 >6 -175 15 36735 g2f1 c6c5 d4c5 f4d3 c1h6 d6c5 >7 -180 48 125259 g2f1 e8e2 c1b1 d6e7 h4f4 c7f4 f1e2 e7f6 >8 -166 109 269919 g2f1 e8e2 c1b1 e2d2 b1c1 d6b4 h1g1 c7d6 >9 578 740 2537825 c1f4 d6e7 b3f7 g8f8 f6e5 g6g5 f4f5 c7a5 f5d7 f8f7 h4h5 a5a2 >10 903 1506 3165852 c1f4 d6e7 h4h5 e7f6 f4f6 c7g3 f2g3 g6h5 f6g6 g8f8 g6c6 d7d4 >c6b5 >11 951 3393 8126737 c1f4 d6e7 h4h5 e7f6 f4f6 c7g3 g2g3 g6h5 f6c6 e8e7 >12 19986 13175 40793708 c1f4 d6e7 h4h5 e7f6 f4f6 c7g3 g2g3 g6h5 h1h5 e8e7 f6h8# >move c1f4 Hmm -- guess I feel heartened that even the great Crafty sees that the reply to Qxf4 is not Bxf4.
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