Author: Heiner Marxen
Date: 12:24:07 04/29/01
Go up one level in this thread
On April 29, 2001 at 04:05:12, Tim Foden wrote: >On April 28, 2001 at 20:30:21, Heiner Marxen wrote: > >>On April 28, 2001 at 18:53:11, Dann Corbit wrote: >> >>>[D]k7/8/2p1p3/1pR2p2/3N4/1p1B1p2/1Rp1p3/4K3 w - - bm Rxc6; pv Rxc6 f2+ Kxe2 e5 >>>Rxb3 e4 Nxb5 exd3+ Kxf2 Kb7 Nd4+ Ka7 Rc4 Ka6 Ra4#; >>> >>>How long does it take your program to find this mate in 8? >> >>Hi Dann, >> >>Chest needs 81 seconds on a K7, 600 MHz (350 MB hash) to find that there >>are 3 different key moves to solve the mate in 8. I give a PV for each: >> >>Bxb5 Kb7 Rxc6 c1=N Bxe2 Nxe2 Rxb3+ Ka7 Rc7+ Ka6 Nc6 f2+ Kxf2 >>=*= Ra7# >>Rxb3 f2+ Kxe2 c1=B Nxb5 Kb7 Na7+ Kc7 Rxc6+ Kd8 Rb7 f1=B+ Kxf1 >>=*= Rc8# >>Rxc6 f2+ Kxe2 e5 Nxb5 Kb7 Nd4 Ka7 Rxb3 c1=N+ Rxc1 f1=B+ Rxf1 >>=*= Ra1# >> >>The complete solution tree is much larger. =*= means "any legal move". > >Hi Heiner, > >Green Light 2.14-pr8 thinks: > > 13 2:35 Mate08 133677k Rxb3 c1=Q+ Rxc1 f2+ Kxe2 f1=Q+ Kxf1 f4 Nxc6 Kb7 > Nd8+ Ka7 Rxb5 Ka6 Ra1# <ht> > >Is this one of the possible variations? Yes, this is line 16697 (of 21178) ;-) It is fine as a PV. >Cheers, Tim. Cheers, Heiner
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