Author: Heiner Marxen
Date: 03:41:36 04/17/01
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On April 14, 2001 at 11:25:53, Paul wrote: >On April 14, 2001 at 10:37:06, leonid wrote: > >>Hello! >> >>If you like to solve one mate (or if you want to selebrate Passover by >>crucifying your solfware) then this position is just for you: >> >>[D]1qRr2bk/Q1P1q1bq/4Qn1N/3qq1Qn/KRQ1Qq1N/B2B4/6Qq/2q3r1 w - - >> >>Please, indicate your result. >> >>Thanks, >>Leonid. > >The first thing Pretz says is this (mate in 13): > >11:34 WM13 10 Qxg8+ Qhxg8 Ng6+ Kh7 Nxe5+ Kh8 Ng6+ Kh7 Nxe7+ Kh8 Qh7+ Qxh7 >cxd8=Q+ Ne8 Qxe8+ Bf8 Qad4+ Qbe5 Qdxe5+ Qfxe5 Qxf8+ Qhg8 Qfxg8+ Qxg8 Rxg8# > >Will try some different extensions later ... > >Groetjes, >Paul That is interesting, since according to Chest this is indeed a mate in 13. After 5 hours (K7/600, 350MB hash) Chest gives this PV: Qxg8+ Qhxg8 Ng6+ Kh7 Nxe5+ Kh8 Ng6+ Kh7 Nxe7+ Kh8 Ng6+ Kh7 Ne5+ Nxe4 Qgxe4+ Kh8 Qh7+ Qxh7 cxd8Q+ Qf8 Qxf8+ Qhg8 Qxg8+ Qxg8 Nhf7# The effective branching factor was quite good for Chest, between 2.7 and 5 most of the time (for a full move). But ETC (enhanced transposition cutoff) was extremely useless (5% hit rate). I have no idea, why. Hi Paul, you are right, I've been away for a week, visiting my brother's family in Switzerland, but I did not expect someone to take notice ;-) Now I will scan through a full week of CCC... Cheers, Heiner
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