Author: Jeremiah Penery
Date: 20:37:54 02/14/01
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On February 14, 2001 at 16:29:28, Uri Blass wrote: >On February 14, 2001 at 13:55:54, Jeremiah Penery wrote: > >>On February 14, 2001 at 06:38:34, leonid wrote: >> >>>Hi! >>> >>>If you like to solve forced mate then you can try this: >>> >>>[D]2kr3r/qq2q1qp/nnb1nbn1/1B2QnN1/3N1Q2/1NQ1B1B1/1P4Q1/R1R3K1 w - - >>> >>>Please, indicate your result. >> >>Modified Crafty with Singular Extensions finds: >> >>9 15:20 Mat09 1. Qcxc6+ Nec7 2. Qxb7+ Qxb7 3. Qxb7+ >> Kxb7 4. Rxc7+ Nxc7 5. Qxc7+ Qxc7 6. >> Nc5+ Qxc5 7. Ba6+ Ka7 8. Bc8+ Na4 9. >> Qb8# <HT> >> >>Maybe the number of moves will go down later, but I'm not going to let it search >>any longer. :) > >Is it the first mate that your modified Crafty discovers >If it is then Junior is faster: It seems to me that PV-Singular Extensions (the ones I have code for in Crafty) do not help in finding mates. The search tree gets a lot bigger, but the mate isn't found any faster. Maybe this isn't the case always, or maybe it depends on the singular-margin used and the amount being extended. In any case, Junior is a lot faster here. :) >Junior5.9 on p200 has the follwong evaluation > >9 0:52 MATE10 1.Qcxc6+ Nec7 2.Qxb7+ Qxb7 3.Qxb7+ Kxb7 4.Bxa6+ Ka8 5.Bf1+ Kb8 >6.Nc6+ Kb7 7.Ra7+ Kc8 8.Qxc7+ Qxc7 9.Qxf5+ Qgd7 10.Rxc7# > >Unfortunately Junior stops to search when it finishes iteration when it finds a >mate for itself. > >I guess that chessmaster is faster in finding a mate but I did not check it. > >Uri
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