Author: Sune Fischer
Date: 06:49:18 05/22/04
Go up one level in this thread
On May 22, 2004 at 08:17:11, Bas Hamstra wrote: >On May 21, 2004 at 20:30:53, Dann Corbit wrote: > >>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 24 >>>>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) >>> >>> >I don't agree at all. IMO it's kind of ridiculous to let a PV end in checkmate >without showing a mate score. What is happening here is that Crafty doesn't have >a clue about the checkmate (because of how it's qsearch operates) and so does >not evaluate it. However the PV print routine DOES recognize it. You can't trust a PV ending in mate if the score has not been passed through the tree. In general it is possible that black could have found something better than Rc6 had he seen it lead to a mate. -S. >Bas.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.