Author: Stan Arts
Date: 08:41:57 08/23/04
Go up one level in this thread
On August 23, 2004 at 11:00:50, Alessandro Scotti wrote: >On August 23, 2004 at 10:19:54, Uri Blass wrote: > >>After Rh6+ Kg4 f5+ exf6 I see no mate but only draw. >>Maybe you have a bug in the enpassant code and you do not consider exf6 > >In fact, probably (*) the best continuation after Rh6+ Kg4 is Qd7+. > >(*) That is, my computer thinks... :-) Atleast there's no easy mate in sight after Nxh3 Kxh3 Rh6+. Neurosis also thinks it's a draw at most for black. P3-550 48 MB hash. Legal moves: 41 Static score: -145 Ply Score Time Nodes Best move and expected line ------------------------------------------------------------ 2 -132 5 2768 Rh6+ Kg4 Qd7+ f5 Ra6 3 -132 5 3318 Rh6+ Kg4 Qd7+ f5 Ra6 4 -123 38 33967 Rh6+ Kg4 f5+ exf6ep Qd7+ f5 Rxf6 5 -123 87 64945 Rh6+ Kg4 f5+ exf6ep Qd7+ f5 Rxf6 6 -124 351 285424 Rh6+ Kg4 f5+ exf6ep Rg6+ Kh4 Rh6+ Kg4 Rg6+ Kh4 Rh6+ Kg4 7 0 752 552238 Rh6+ < + > Kg4 f5+ exf6ep Rg6+ Kh4 Rh6+ 7 0 1087 829919 Rh6+ Kg4 f5+ exf6ep Rg6+ Kh4 Rh6+ Kg4 Rg6+ Kh4 Rh6+ Kg4 8 0 3284 2779140 Rh6+ Kg4 f5+ exf6ep Rg6+ Kh4 Rh6+ Kg4 Rg6+ Kh4 Rh6+ Kg4 9 40 8013 6890800 Rh6+ < + > Kg4 Rb5-b6 Bxd4 cxd4 Qh2 9 50 8947 7775054 Rh6+ Kg4 Rb5-b6 f5 Qe4+ Rf4 Qh1 Rf2 Qxa1 Qxc5 10 10 27490 23833006 Rh6+ < - > Kg4 Rb5-b6 f5 Qe4+ Rf4 Qxf5+ Rxf5 Rb6-g6+ Kf4 10 0 31768 28125651 Rh6+ Kg4 f5+ exf6ep Rg6+ Kh4 Rh6+ Kg4 Rg6+ Kh4 Rh6+ Kg4 11 0 86200 76806762 Rh6+ Kg4 f5+ exf6ep Rg6+ Kh4 Rh6+ Kg4 Rg6+ Kh4 Rh6+ Kg4 Total nodes:103519208 n/sec:86600 (Q-nodes:15% max depth:34) Then, does Qd7+ after Rh6+ Kg4 also draw, or even win? Neurosis doesn't even see a draw for black after Rh6+ Kg4 Qd7+ (Now seen from white's side, so positive is bad for black.) (Seems a huge branchingfactor, and it is, but because of all the checks it's searching all these lines much deeper then the reported normal depth. ) Legal moves: 4 Static score: 143 Ply Score Time Nodes Best move and expected line ------------------------------------------------------------ 2 132 11 8455 f5 Ra6 3 132 11 10155 f5 Rg6+ Kh3 Rh6+ Kg4 Rg6+ Kh3 Rh6+ Kg4 3 141 16 11970 Kf3 Qb7+ Ke2 Rh2+ Rf2 Qe4+ Kf1 4 -325 33 29160 Kf3 Qd5+ Ke2 Rh2+ Kd1 Rxc2 4 135 71 59442 f5 Qe7 Qc4 Rh6-b6 5 131 115 96908 f5 Rg6+ Kh3 Rh6+ Kg4 Rg6+ Kh3 Rh6+ Kg4 6 131 236 194339 f5 Rg6+ Kh3 Rh6+ Kg4 Rg6+ Kh3 Rh6+ Kg4 7 127 1219 1017036 f5 Rg6+ Kh5 Rh6+ Kg5 Qe7+ Kf4 Ra6 Rf1-d1 Rb5-a5 8 124 6399 5318016 f5 Rg6+ Kh4 Rg6-b6 Kh3 Rh6+ Kg4 Rg6+ Kh4 Rg6-b6 Kh3 Rh6+ Kg4 9 130 27534 24211687 f5 Rg6+ Kh4 Rh6+ Kg5 Rh6-b6 Kf4 Kh8 Qc4 Qb7 Rf1-d1 Bb2 10 99 74243 65031460 f5 Rg6+ Kh4 Rg6-b6 Kh3 Qb7 Re1 Rh6+ Kg4 Rh1 Rd3-d1 h5+ Kf4 Rxb3 Qxb3 Rf1+ Rxf1 Qxb3 Total nodes:104176805 n/sec:87100 (Q-nodes:17% max depth:32) Stan
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