Author: Maarten Claessens
Date: 05:50:24 02/11/06
Go up one level in this thread
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 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 It is mate in 14! Analysis by TogaII (after the forced moves Rxh7+ Kxh7 Rxf7+ Rxf7 Qxg6+ Kh8 Qxf7): FEN: 2r4k/3qbQ2/p3n3/2ppP3/8/1P1B4/PBP3PP/7K b - - 0 4 Toga II 1.1a: 1/4 00:00 10 0 -9,71 Bf8 Qxd7 1/6 00:00 48 0 +0,11 Ng5 2/8- 00:00 352 0 -10,53 Ng5 e6+ d4 exd7 3/11- 00:00 811 0 -13,43 Ng5 e6+ d4 exd7 Nxf7 dxc8Q+ Kg7 Qxa6 4/14 00:00 1.415 0 -13,43 Ng5 e6+ d4 exd7 Nxf7 dxc8Q+ Kg7 Qxa6 5/15 00:00 2.912 0 -13,43 Ng5 e6+ d4 exd7 Nxf7 dxc8Q+ Kg7 Qxa6 6/23 00:00 7.208 0 -13,42 Ng5 e6+ d4 exd7 Nxf7 dxc8Q+ Kg7 b4 cxb4 Bxd4+ Bf6 7/23- 00:00 13.340 0 -15,50 Ng5 e6+ d4 Qh5+ Kg8 exd7 Rf8 Qg6+ Kh8 h4 Rb8 Qe8+ Kg7 Qxb8 8/25- 00:00 23.391 0 -17,17 Ng5 e6+ d4 Qh5+ Kg8 exd7 Rf8 Qg6+ Kh8 h4 Rf7 hxg5 Rg7 Qe8+ Rg8 Qxe7 9/27 00:00 55.365 0 -17,17 Ng5 e6+ d4 Qh5+ Kg8 Qg6+ Kh8 exd7 Rf8 h4 Rf7 hxg5 Rg7 Qe8+ Rg8 Qxe7 10/37- 00:00 177.838 0 -18,20 Ng5 e6+ d4 Qh5+ Kg7 Qg6+ Kh8 exd7 Rf8 h4 Rf7 hxg5 Rf5 Qxf5 11/37- 00:00 403.664 0 -19,09 Ng5 e6+ d4 Qh5+ Kg8 exd7 Rb8 Qg6+ Kf8 Qh6+ Kg8 Bc4+ Nf7 Qg6+ Kh8 Qh5+ Kg7 Qxf7+ Kh6 Bc1+ Bg5 Qf6+ Kh7 Bd3+ Kg8 Qxg5+ Kf7 d8Q Rxd8 Qxd8 12/49- 00:13 7.436.380 552.495 -21,70 Ng5 e6+ d4 Qh5+ Kg7 Qg6+ Kh8 exd7 Rf8 h4 Rf6 Qe8+ Rf8 Qxe7 Ra8 Qf6+ Kg8 Qxg5+ Kf8 Qxc5+ Kf7 Qd5+ Ke7 Qxa8 Kxd7 Bxd4 12/49 00:13 7.526.745 552.495 -19,24 Bh4 Qxd7 Rc7 Qxe6 Kg7 Qxd5 Kf8 e6 Ke7 Be5 Kf8 Qf3+ Ke8 Bxc7 13/49- 01:00 34.324.941 570.899 -M9 Bh4 Qxd7 Rc7 Qxe6 Re7 Qxd5 Bf6 e6 Bd4 Bxd4+ cxd4 Qd8+ Kg7 Qxe7+ Kh6 Qf6+ Kh5 Be2+ 14/49 02:21 79.527.082 561.707 -M9 Bh4 Qxd7 Rc7 Qxe6 Bg5 Qxd5 Kg7 e6+ Bf6 Qg5+ Kf8 Bxf6 Rf7 Qh6+ Ke8 Qh8+ Rf8 Bg6+ 14/49 07:34 250.936.534 552.694 -M11 Ng5 e6+ d4 Qh5+ Kg7 Qg6+ Kh8 exd7 Rf8 h4 Rf6 Qe8+ Bf8 hxg5 Rf1+ Bxf1 Kg7 d8Q Kg8 Qxf8+ Kh7 Qf7+ Maarten Claessems
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