Author: Vincent Lejeune
Date: 12:19:24 02/11/06
Go up one level in this thread
Time Depth Score Positions Moves 0:12 1/12 16.71 4763919 1.Rxh7+ Kxh7 2.Rxf7+ Rxf7 3.Qxg6+ Kh8 4.Qxf7 Bf8 5.Qxd7 Rc7 6.Qxe6 Rg7 7.Qxd5 c4 8.Qxc4 a5 9.Qh4+ Kg8 10.Bc4+ Rf7 11.Bxf7+ Kxf7 0:37 1/13 22.40 14518112 1.Rxh7+ Kxh7 2.Rxf7+ Rxf7 3.Qxg6+ Kh8 4.Qxf7 Bg5 5.Qxd7 Rc7 6.Qxe6 Kg7 7.Qg6+ Kf8 8.Qxg5 Re7 9.Qh6+ Kf7 10.Qf6+ Ke8 11.e6 Kd8 12.Qf8+ Kc7 13.Qxe7+ Kb6 1:12 2/14 Mate16 29870103 1.Rxh7+ Kxh7 2.Rxf7+ Rxf7 3.Qxg6+ Kh8 4.Qxf7 Bg5 5.Qxd7 Rc7 6.Qxe6 Kg7 7.Qxd5 Bc1 8.Bc4 Bxb2 9.Qg8+ Kh6 10.Bd3 Rg7 11.Qh8+ Kg5 12.Qxg7+ Kh4 13.Qg3+ Kh5 14.Qg6+ Kh4 15.g3+ Kh3 16.Qf5# 9:47 2/15 Mate16 188202481 1.Rxh7+ Kxh7 2.Rxf7+ Rxf7 3.Qxg6+ Kh8 4.Qxf7 Ng5 5.e6+ d4 6.Qh5+ Kg7 7.Qg6+ Kh8 8.exd7 Rf8 9.h4 Rf6 10.Qe8+ Bf8 11.d8=Q Kg7 12.Qed7+ Nf7 13.Qg4+ Ng5 14.Qxg5+ Kh8 15.Qgxf6+ Kg8 16.Qdxf8# 22:32 2/16 Mate16 511962626 1.Rxh7+ Kxh7 2.Rxf7+ Rxf7 3.Qxg6+ Kh8 4.Qxf7 Ng5 5.e6+ d4 6.Qh5+ Kg7 7.Qg6+ Kh8 8.exd7 Rf8 9.h4 Rf6 10.Qe8+ Bf8 11.d8=Q Kg7 12.Qed7+ Nf7 13.Qg4+ Ng5 14.Qxg5+ Kh8 15.Qgxf6+ Kg8 16.Qdxf8# 1:03:50 3/17 Mate15 1599980495 1.Rxh7+ Kxh7 2.Rxf7+ Rxf7 3.Qxg6+ Kh8 4.Qxf7 Ng5 5.e6+ d4 6.Qh5+ Kg7 7.Qg6+ Kh8 8.exd7 Rf8 9.h4 Rf6 10.Qe8+ Bf8 11.hxg5 Rf1+ 12.Bxf1 Kg7 13.Bc4 Kh7 14.Qh5+ Kg7 15.Qh6# 2:51:24 3/18 Mate15 169239946 1.Rxh7+ Kxh7 2.Rxf7+ Rxf7 3.Qxg6+ Kh8 4.Qxf7 Ng5 5.e6+ d4 6.Qh5+ Kg7 7.Qg6+ Kh8 8.exd7 Rf8 9.h4 Rf6 10.Qe8+ Bf8 11.hxg5 Rf1+ 12.Bxf1 Kg7 13.Bc4 Kh7 14.Qh5+ Kg7 15.Qh6# On February 11, 2006 at 07:45:56, Tord Romstad wrote: >I am currently debugging the SMP version of Glaurung. This morning, >I tested it in the following position from the LCT2 test suite: > >[D]2r2r2/3qbpkp/p3n1p1/2ppP3/6Q1/1P1B3R/PBP3PP/5R1K w - - > >This position is very easy on modern hardware. Most programs find >the winning move Rxh7+ in just a tiny fraction of a second. My new >SMP version, however, surprised me by announcing mate in 15 after >about a 18 plies and 68 seconds, and reducing this to mate in 14 two >iterations later. This seems a bit suspicious to me. When using one >thread, Glaurung doesn't anounce a mate even after 21 plies. > >Is the position really a mate in 14 moves (or less), or do I have a bug >to track down? > >The analysis is given below: > >2 +181 26 203 Bc1 Kg8 Bxa6 >2 +245 26 326 Bxa6 h5 >3 +279 26 1110 Bxa6 Ra8 Bd3 Rxa2 >4 +185 26 3317 Bxa6 Ra8 Bd3 Kg8 >4 +192 27 5267 Bc1 Kg8 Bxa6 Rb8 >4 +215 28 5969 c4 Kg8 cxd5 Qxd5 Bxa6 >5 +215 29 9257 c4 Kg8 cxd5 Qxd5 Bxa6 >5 +873 30 11554 Rxh7+ Kxh7 Rxf7+ Rxf7 Qxg6+ Kh8 Qxf7 Ng7 e6 Qxe6 Qxe6 >6 +1201 31 17420 Rxh7+ Kxh7 Rxf7+ Rxf7 Qxg6+ Kh8 Qxf7 Nf8 e6+ d4 exd7 Nxd7 Qxe7 >7 +1295 33 27246 Rxh7+ Kxh7 Rxf7+ Rxf7 Qxg6+ Kh8 Qxf7 Bg5 Qxd7 Rc7 Qxe6 >8 +1323 36 45243 Rxh7+ Kxh7 Rxf7+ Rxf7 Qxg6+ Kh8 Qxf7 Nf8 e6+ d4 exd7 Rc7 Qxe7 >Nxd7 Bxa6 >9 +1326 44 97447 Rxh7+ Kxh7 Rxf7+ Rxf7 Qxg6+ Kh8 Qxf7 Bg5 Qxd7 Rc7 Qxe6 c4 bxc4 >10 +1340 52 161173 Rxh7+ Kxh7 Rxf7+ Rxf7 Qxg6+ Kh8 Qxf7 Bf8 Qxd7 Rc7 Qxe6 c4 >bxc4 Rb7 >11 +1379 68 281072 Rxh7+ Kxh7 Rxf7+ Rxf7 Qxg6+ Kh8 Qxf7 Bg5 Qxd7 Rc7 Qxe6 c4 >bxc4 dxc4 Bxc4 >12 +1403 103 596597 Rxh7+ Kxh7 Rxf7+ Rxf7 Qxg6+ Kh8 Qxf7 Bf8 Qxd7 Rc7 Qxe6 c4 >Qxd5 cxd3 e6+ Kh7 Qxd3+ Kg8 Qg3+ Rg7 Bxg7 Bxg7 >13 +1510 179 1242976 Rxh7+ Kxh7 Rxf7+ Rxf7 Qxg6+ Kh8 Qxf7 Bf8 Qxd7 Rc7 Qxe6 c4 >Bf5 Re7 Qf6+ Kg8 Be6+ Kh7 Bxd5 Rd7 Bxc4 >14 +1589 302 2291408 Rxh7+ Kxh7 Rxf7+ Rxf7 Qxg6+ Kh8 Qxf7 Bf8 Qxd7 Rc7 Qxe6 Ra7 >Qf6+ Kg8 e6 Rg7 e7 Rxe7 Qh8+ Kf7 Qh5+ Ke6 Qf5+ Kd6 Qxf8 d4 Bxa6 Ke6 >15 +2059 876 7256632 Rxh7+ Kxh7 Rxf7+ Rxf7 Qxg6+ Kh8 Qxf7 Bh4 Qxd7 Rc7 Qxe6 Kg7 >Qxd5 Kf8 e6 Ke8 Qd6 Be7 Qxc7 c4 Bxc4 >16 +2243 1801 14798078 Rxh7+ Kxh7 Rxf7+ Rxf7 Qxg6+ Kh8 Qxf7 Bf8 Qxd7 Rc7 Qxe6 >Rg7 Qxd5 c4 e6 cxd3 Bxg7+ Kxg7 Qg5+ Kh8 Qh5+ Kg7 Qf7+ Kh6 Qxf8+ Kg5 Qg7+ Kf5 >17 +2412 3753 31443058 Rxh7+ Kxh7 Rxf7+ Rxf7 Qxg6+ Kh8 Qxf7 Ng5 e6+ d4 Qh5+ Kg8 >exd7 Rf8 Bc1 c4 Bxc4+ Nf7 Qg4+ Kh8 Qxd4+ Kh7 Qe4+ Kg7 Qxe7 a5 Bh6+ Kg6 Qxf8 >18 +9971 6875 57849904 Rxh7+ Kxh7 Rxf7+ Rxf7 Qxg6+ Kh8 Qxf7 Ng5 e6+ d4 Qh5+ Kg8 >exd7 Rd8 Qg6+ Kh8 Bc1 Rxd7 Qh6+ Kg8 Bc4+ Rd5 Bxd5+ Nf7 Qg6+ Kh8 Bxf7 Bf8 Qg8# >19 +9971 9814 82302985 Rxh7+ Kxh7 Rxf7+ Rxf7 Qxg6+ Kh8 Qxf7 Ng5 e6+ d4 Qh5+ Kg8 >exd7 Rd8 Qg6+ Kh8 Bc1 Rxd7 Qh6+ Kg8 Bc4+ Rd5 Bxd5+ Nf7 Qg6+ Kh8 Bxf7 Bf8 Qg8# >20 +9973 15488 130106000 Rxh7+ Kxh7 Rxf7+ Rxf7 Qxg6+ Kh8 Qxf7 Ng5 e6+ d4 Qh5+ >Kg8 exd7 Rd8 Qg6+ Kh8 Bc1 Rxd7 Bc4 Rd8 Qh6+ Nh7 Bd3 Kg8 Qg6+ Kh8 Qxh7# >21 +9973 28792 244255722 Rxh7+ Kxh7 Rxf7+ Rxf7 Qxg6+ Kh8 Qxf7 Ng5 e6+ d4 Qh5+ >Kg8 exd7 Rd8 Qg6+ Kh8 Bc1 Rxd7 Bc4 Rd8 Qh6+ Nh7 Bd3 Kg8 Qg6+ Kh8 Qxh7# > >Tord
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