Author: Stan Arts
Date: 06:11:48 10/17/03
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>>[D] 2br1R1R/8/1Ppp1br1/3B1k1P/Q1NP1P2/1N4BP/2P5/2Kn4 w - - >> >> I got this one from the back pages of "Blackburne's Chess Games". >> Interesting, because Blackburne himself claims a mate in 4. >> This is his solution: >> 1 Rh6 Rxh6 >> 2 Nc5 cd >> 3 Qe8 Any >> 4 white mates accordingly (his words). >> I have'nt gone over it to find out where Blackburne went wrong, but >> this is what CM9K with ss=0 has to say. >> >> Lyn Hi Lyn Neurosis 1.4(next version) on slow pIII-550 with 64MB hash. Legal moves: 49 Ply Score Time Nodes Best move and expected line ------------------------------------------------------------ 2 2085 0 862 Rxf6+ Kxf6 Rxd8 3 2085 0 1127 Rxf6+ Kxf6 Rxd8 3 2112 0 1262 hxg6 < + > Nc3 Rxd8 3 2312 6 1557 hxg6 Rxf8 Rxf8 4 2268 39 30304 hxg6 < - > Rxf8 Bf3 Ke6 4 2176 44 33960 hxg6 Rxf8 Nxd6+ Kxg6 Rxf8 5 2226 143 116387 hxg6 < + > Bd7 Rxd8 Bxd8 5 2231 165 136481 hxg6 Rxf8 Rxf8 cxd5 Kxd1 6 2191 967 772187 hxg6 < - > Rxf8 h4 cxd5 6 2177 1066 852526 hxg6 Rxf8 Rxf8 cxd5 Nxd6+ Kxg6 Qe8+ Kh6 6 2178 3422 2681609 Qa7 < + > Be6 hxg6 Bc8 6 2269 3532 2782776 Qa7 cxd5 Qf7 Ke4 Qxg6+ Kf3 Rxd8 7 2269 4263 3341260 Qa7 cxd5 Qf7 Ke4 Bf2 Kf3 7 2270 6471 5215378 Qxc6 < + > Be6 hxg6 Rb8 7 2336 7124 5796998 Qxc6 Rxg3 Nxd6+ Kxf4 Rxf6+ Ke3 Rxd8 7 2349 15616 13106642 Rh6 < + > Rd7 hxg6 Nb2 7 2599 15934 13408438 Rh6 < + > c5 hxg6 Rd7 7 9991 19241 16197863 Rh6 (Mate in 5) Bb7 Rxg6 cxd5 Rf8xf6+ Ke4 Nc4-d2+ Ke3 Re6+ 8 9991 35268 29735582 Rh6 (Mate in 5) Bb7 Rxg6 cxd5 Rf8xf6+ Ke4 Nc4-d2+ Ke3 Re6+ Total nodes:49502916 n/sec:83203 (Q-nodes:1429662 max depth:19) And to "prove" there is no mate in 4, I let it do a brute force search (but with check- extentions etc.) on the position. And it doesn't return a mate in 4 in the depth a mate in 4 would be found. 2 2085 0 862 Rxf6+ Kxf6 Rxd8 3 2085 0 1127 Rxf6+ Kxf6 Rxd8 3 2112 0 1262 hxg6 < + > Nc3 Rxd8 3 2312 0 1557 hxg6 Rxf8 Rxf8 4 2268 38 30304 hxg6 < - > Rxf8 Bf3 Ke6 4 2176 44 34068 hxg6 Rxf8 Nxd6+ Kxg6 Rxf8 5 2231 181 151962 hxg6 Rxf8 Rxf8 cxd5 Kxd1 6 2191 1758 1501593 hxg6 < - > Rxf8 b7 cxd5 6 2177 1878 1606392 hxg6 Rxf8 Rxf8 cxd5 Nxd6+ Kxg6 Qe8+ Kh6 6 2178 5311 4410824 Qa7 < + > Be6 hxg6 Re8 6 2269 5481 4565681 Qa7 cxd5 Qf7 Ke4 Qxg6+ Kf3 Rxd8 7 2269 7794 6525596 Qa7 cxd5 Qf7 Ke4 Qxg6+ Kf3 Rxd8 7 2270 17664 14550680 Qxc6 < + > Re8 hxg6 Nc3 7 2336 19702 16367054 Qxc6 Rxg3 Nxd6+ Kxf4 Rxf6+ Ke3 Rxd8 7 2339 58776 48918486 Rh6 < + > c5 hxg6 Be6 7 2589 58973 49106074 Rh6 < + > Bb7 Nc5 dxc5 7 9991 60616 50513232 Rh6 (Mate in 5) Bb7 Rxg6 cxd5 Rf8xf6+ Ke4 Nc4-d2+ Ke3 Re6+ 8 9991 85969 70885976 Rh6 (Mate in 5) Bb7 Rxg6 cxd5 Rf8xf6+ Ke4 Nc4-d2+ Ke3 Re6+ Total nodes:73527817 n/sec:82158 (Q-nodes:1124017 max depth:18) Stan
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