Author: Dann Corbit
Date: 17:30:53 05/21/04
Go up one level in this thread
On May 21, 2004 at 20:25:04, Uri Blass wrote: >On May 21, 2004 at 20:17:21, Mike Byrne wrote: > >>On May 21, 2004 at 19:32:33, George Tsavdaris wrote: >> >>>Black threatens mate and white's Queen. What white should play? >>>Give it's Queen of course! Qf4!! and white is winning. >>> >>> Impressive for humans but not for computers, as any chess engine can solve >>>this in seconds.... >>> >>>[D]1kbr3r/pp6/8/P1n2ppq/2N3n1/R3Q1P1/3B1P2/2R2BK1 w - - 0 1 >> >> >>Black(1): mt 2 >>max threads set to 2 >>Black(1): 1kbr3r/pp6/8/P1n2ppq/2N3n1/R3Q1P1/3B1P2/2R2BK1 w - - 0 1 >>White(1): go >> clearing hash tables >> time surplus 29.92 time limit 1666:39 (1666:39) >> depth time score variation (1) >>starting thread 1 >> 1 0.00 2.84 1. Qxc5 >> 1-> 0.00 2.84 1. Qxc5 >> 2 0.00 -1 1. Qxc5 >> 2 0.00 -Mat01 1. Qxc5 Qh1# >> 2 0.00 -9.26 1. Qe5+ Nxe5 2. Nxe5 Rxd2 3. Rxc5 >> 2 0.02 -8.25 1. Bg2 Nxe3 2. Rxe3 >> 2-> 0.02 -8.25 1. Bg2 Nxe3 2. Rxe3 >> 3 0.02 -8.25 1. Bg2 Nxe3 2. Rxe3 >> 3-> 0.04 -8.25 1. Bg2 Nxe3 2. Rxe3 >> 4 0.04 -8.62 1. Bg2 Nxe3 2. Rxe3 Qh2+ 3. Kf1 Nd3 >> 4-> 0.05 -8.62 1. Bg2 Nxe3 2. Rxe3 Qh2+ 3. Kf1 Nd3 >> 5 0.07 -8.58 1. Bg2 Nxe3 2. Rxe3 Nd3 3. Rc2 >> 5 0.07 -8.29 1. Qf4+ gxf4 2. Bxf4+ Ka8 3. Nb6+ axb6 >> 4. axb6+ Na6 5. Rxc8+ Rxc8 6. Rxa6+ >> bxa6 7. Bg2+ Rc6 8. Bxc6# >> 5-> 0.08 -8.29 1. Qf4+ gxf4 2. Bxf4+ Ka8 3. Nb6+ axb6 >> 4. axb6+ Na6 5. Rxc8+ Rxc8 6. Rxa6+ >> bxa6 7. Bg2+ Rc6 8. Bxc6# (s=9) > > >What is this? >Crafty evaluates mate as -8.29 pawns? > >Movei always evaluates mate as Mate-ply when ply is the number of plies from the >root position. Crafty has not resolved the mate yet. Crafty is sure of a win (at +8 pawns, it is almost impossible to lose). But a 5 ply search with 8 hundredths of a second has not determined for a certainty that there is no alternative to checkmate. It is also possible to see a pv with a # in it that is not a checkmate at all. So that knife cuts both ways.
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