Author: Stan Arts
Date: 07:50:29 01/26/04
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On January 26, 2004 at 09:57:51, robert flesher wrote: >Ruffian plays NF8?? when Nf6 holds to draw? >[D] 1k6/1P5n/2K1B3/8/8/8/8/8 b - - 0 84 Hello I don't have Ruffian 2.0 or Leiden version but the older 1.0.1 version has no problem and plays Nf6 with a drawscore on my computer. To confirm the draw. Neurosis 1.7 PIII-550 with 32 MB hash. Nf6 is indeed a draw, and the move and drawscore is very easy to find. Legal moves: 4 Static score: -220 Ply Score Time Nodes Best move and expected line ------------------------------------------------------------ 2 -218 0 68 Ng5 Ba2 3 -217 0 144 Ng5 Bf5 Nf3 4 -219 0 614 Ng5 Bf5 Nf3 Kb6 5 -218 5 4283 Ng5 Bf5 Nf3 Kb6 Ne5 5 -217 5 6437 Nf6 < + > Ba2 Nd7 Bb3 Ne5+ 5 -217 5 8484 Nf6 Bh3 Nd5 Bg2 Ne3 6 -218 11 14236 Nf6 Bc8 Ne4 Bf5 Ng3 Bg6 7 -217 22 24880 Nf6 Bh3 Nd5 Bg2 Ne3 Bf3 Ka7 8 -218 55 56111 Nf6 Bh3 Nd5 Bg2 Ne3 Bf3 Nc4 Bg2 Na5+ Kd5 Nxb7 Ka8 9 -215 104 101813 Nf6 Bh3 Nd5 Bg2 Ne3 Bf3 Nc4 Kc5 Ne5 Ka7 10 -215 247 261644 Nf6 Bf5 Nd5 Bh3 Nb4+ Kb6 Nd5+ Kc6 Nb4+ Kb6 Nd5+ Kc6 11 -213 412 420087 Nf6 Bf5 Nd5 Be4 Nb6 Bd3 Nd7 Ba6 Ne5+ Kb6 Nc4+ Kc6 Ne5+ Kb6 Nc4+ Kc6 Ne5+ 12 -213 736 793151 Nf6 Bf5 Nd5 Be4 Nb6 Bd3 Nd7 Ba6 Ne5+ Kb6 Nc4+ Kc6 Ne5+ Kb6 Nc4+ Kc6 Ne5+ 13 -212 1219 1269507 Nf6 Bf5 Nd5 Be4 Nb6 Bd3 Nd7 Ba6 Ne5+ Kb6 Nc4+ Kc6 Ne5+ Kb6 Nc4+ Kc6 Ne5+ 14 -150 2631 2769226 Nf6 < + > Bf5 Nd5 Be4 Nb6 Bd3 Nd7 Ba6 Ne5+ Kb6 Nc4+ Kc6 Ne5+ Kb6 14 -5 3307 3499395 Nf6 Bf5 Nd5 Bc8 Ne7+ Kd6 Nxc8+ bxc8=Q+ Kxc8 Kc6 Kb8 Kb6 Kc8 Kc6 Kb8 Kb6 Kc8 Kc6 15 -1 4877 5165662 Nf6 Bf5 Nd5 Bc8 Ne3 Be6 Nc2 Kb6 Nd4 Bd5 Ne6 Be4 Nd8 Kc5 Nxb7+ Kd4 Ka8 Bg2 Ka7 Bxb7 Kb8 Ke4 16 -1 6586 7116466 Nf6 Bf5 Nd5 Bc8 Ne3 Be6 Nc2 Kb6 Nd4 Bd5 Ne6 Be4 Nd8 Kc5 Nxb7+ Kd4 Ka8 Bg2 Ka7 Bxb7 Kb8 Ke4 Ka7 17 -1 8541 9256213 Nf6 Bf5 Nd5 Bc8 Ne3 Be6 Nc2 Kb6 Nd4 Bd5 Ne6 Be4 Nd8 Kc5 Nxb7+ Kd4 Ka8 Bg2 Ka7 Bxb7 Kb8 Ke4 Ka7 Kd5 18 -1 11793 13001786 Nf6 Bf5 Nd5 Bc8 Ne3 Be6 Nc2 Kb6 Nd4 Bd5 Ne6 Be4 Nd8 Kc5 Nxb7+ Kd4 Ka8 Bg2 Ka7 Bxb7 Kb8 Ke4 Ka7 Kd5 Kb8 19 -1 15538 17164115 Nf6 Bf5 Nd5 Bc8 Ne3 Be6 Nc2 Kb6 Nd4 Bd5 Ne6 Be4 Nd8 Kc5 Nxb7+ Kd4 Ka8 Bg2 Ka7 Bxb7 Kb8 Ke4 Ka7 Kd5 Kb8 Kc6 20 -1 21388 23930768 Nf6 Bf5 Nd5 Bc8 Ne3 Be6 Nc2 Kb6 Nd4 Bd5 Ne6 Be4 Nd8 Kc5 Nxb7+ Kd4 Ka8 Bg2 Ka7 Bxb7 Kb8 Ke4 Ka7 Kd5 Kb8 Kc6 Ka7 21 -1 28490 31696902 Nf6 Bf5 Nd5 Bc8 Ne3 Be6 Nc2 Kb6 Nd4 Bd5 Ne6 Be4 Nd8 Kc5 Nxb7+ Kd4 Ka8 Bg2 Ka7 Bxb7 Kb8 Ke4 Ka7 Kd5 Kb8 Kc6 Ka7 Kd7 22 -1 38695 43390313 Nf6 Bf5 Nd5 Bc8 Ne3 Be6 Nc2 Kb6 Nd4 Bd5 Ne6 Be4 Nd8 Kc5 Nxb7+ Kd4 Ka8 Bg2 Ka7 Bxb7 Kb8 Ke4 Ka7 Kd5 Kb8 Kc6 Ka7 Kd7 Kb8 23 -1 51718 57468116 Nf6 Bf5 Nd5 Bc8 Ne3 Be6 Nc2 Kb6 Nd4 Bd5 Ne6 Be4 Nd8 Kc5 Nxb7+ Kd4 Ka8 Bg2 Ka7 Bxb7 Kb8 Ke4 Ka7 Kd5 Kb8 Kc6 Ka7 Kd7 Kb8 Ba8 24 -1 70975 77782368 Nf6 Bf5 Nd5 Bc8 Ne3 Be6 Nc2 Kb6 Nd4 Bd5 Ne6 Be4 Nd8 Kc5 Nxb7+ Kd4 Ka8 Bg2 Ka7 Bxb7 Kb8 Ke4 Ka7 Kd5 Kb8 Kc6 Ka7 Kd7 Kb8 Ba8 Ka7 25 -1 95158 102846498 Nf6 Bf5 Nd5 Bc8 Ne3 Be6 Nc2 Kb6 Nd4 Bd5 Ne6 Be4 Nd8 Kc5 Nxb7+ Kd4 Ka8 Bg2 Ka7 Bxb7 Kb8 Ke4 Ka7 Kd5 Kb8 Kc6 Ka7 Kd7 Kb8 Ba8 Ka7 Bc6 26 -1 127943 137712461 Nf6 Bf5 Nd5 Bc8 Ne3 Be6 Nc2 Kb6 Nd4 Bd5 Ne6 Be4 Nd8 Kc5 Nxb7+ Kd4 Ka8 Bg2 Ka7 Bxb7 Kb8 Ke4 Ka7 Kd5 Kb8 Kc6 Ka7 Kd7 Kb8 Ba8 Ka7 Bc6 Ka6 27 -1 170428 183917421 Nf6 Bf5 Nd5 Bc8 Ne3 Be6 Nc2 Kb6 Nd4 Bd5 Ne6 Be4 Nd8 Kc5 Nxb7+ Kd4 Ka8 Bg2 Ka7 Bxb7 Kb8 Ke4 Ka7 Kd5 Kb8 Kc6 Ka7 Kd7 Kb8 Ba8 Ka7 Bc6 Ka6 Bb7+ Total nodes:193707575 n/sec:107900 (Q-nodes:1580360 max depth:36) After forcing Nf8 : Legal moves: 16 Static score: 223 Ply Score Time Nodes Best move and expected line ------------------------------------------------------------ 2 224 0 79 Bf5 Ka7 3 226 0 140 Bf5 Ka7 Kc7 4 524 0 1124 Bf5 Nd7 Bxd7 Ka7 5 527 5 2245 Bf5 Nd7 Bxd7 Ka7 Kc7 6 1069 5 4623 Bf5 < + > Ka7 Kc7 Ka6 Bd3+ Ka5 6 1371 5 4840 Bf5 < + > Ka7 Kc7 Ka6 b8=Q Ne6+ 6 1371 5 5688 Bf5 Ka7 Kc7 Ka6 b8=Q Ne6+ Bxe6 Ka5 7 1371 16 13476 Bf5 Ka7 Kc7 Ka6 b8=Q Ne6+ Bxe6 Ka5 8 1371 38 34861 Bf5 Ka7 Kc7 Ka6 b8=Q Ne6+ Bxe6 Ka5 9 1375 121 114977 Bf5 Ka7 Kc7 Ka6 b8=Q Ne6+ Bxe6 Ka5 Qb6+ Ka4 Qb3+ Ka5 Kc6 10 1377 274 261486 Bf5 Ka7 Kc7 Ka6 b8=Q Ne6+ Bxe6 Ka5 Bb3 Ka6 11 9985 362 343272 Bf5 <M8> < + > Ka7 Kc7 Ka6 b8=Q Ka5 Kc6 Ka6 Qb5+ Ka7 Qa4+ 11 9989 1109 1097234 Bf5 <M6> Ka7 Kc7 Ka6 b8=Q Ka5 Kc6 Ka4 Bc2+ Ka5 Qb6+ Total nodes:1554130 n/sec:98900 (Q-nodes:11190 max depth:17) Then Ruffian 1.0.1 with 32 MB hash on my computer after setting up the position and hitting machine-black: 13 0 126 596407 Nf6 Ba2 Ne8 Bb3 Nc7 Bd1 Ne6 Kb6 Nd8 Be2 Nxb7 Bf1 Nd8 14 0 200 964875 Nf6 Ba2 Ne8 Bb3 Nc7 Bd1 Ne6 Kb6 Nd8 Be2 Nxb7 Bf1 Nd8 Ka5 Ka7 15 0 306 1491319 Nf6 Ba2 Ne8 Bb3 Nc7 Bd1 Ne6 Kb6 Nd8 Be2 Nxb7 Bf1 Nd8 Ka5 Ka7 16 0 452 2226782 Nf6 Ba2 Ne8 Bb3 Nc7 Bd1 Ne6 Kb6 Nd8 Be2 Nxb7 Bf1 Nd8 Ka5 Ka7 Be2 Kb8 17 0 662 3243188 Nf6 Ba2 Ne8 Bb3 Nc7 Bd1 Ne6 Kb6 Nd8 Be2 Nxb7 Bf1 Nd8 Ka5 Ka7 Be2 Kb8 18 0 957 4636054 Nf6 Ba2 Ne8 Bb3 Nc7 Bd1 Ne6 Kb6 Nd8 Be2 Nxb7 Bf1 Nd8 Ka5 Ka7 Be2 Kb8 Bf1 19 0 1338 6537803 Nf6 Ba2 Ne8 Bb3 Nc7 Bd1 Ne6 Kb6 Nd8 Be2 Nxb7 Bf1 Nd8 Ka5 Ka7 Be2 Kb8 Bf1 20 0 1870 9148396 Nf6 Ba2 Ne8 Bb3 Nc7 Bd1 Ne6 Kb6 Nd8 Be2 Nxb7 Bf1 Nd8 Ka5 Ka7 Be2 Kb8 Bf1 Also in analysis mode. 18 0 950 4636054 Nf6 Ba2 Ne8 Bb3 Nc7 Bd1 Ne6 Kb6 Nd8 Be2 Nxb7 Bf1 Nd8 Ka5 Ka7 Be2 Kb8 Bf1 Greetings Stan
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