Author: Torstein Hall
Date: 04:44:26 01/27/02
Go up one level in this thread
On January 27, 2002 at 06:20:59, Bas Hamstra wrote: >[D]r2r1bk1/ppqb1ppp/2p1p3/6P1/2PPN3/PB3Q2/1P3P1P/1K1RR3 w - - Nf6!! Fritz needs 1:08 to find Nf6+ on my Athlon 1,4Ghz. It looked like the main problem was that g6 also gives white a nice plus. After that the score just keep growing. New game r2r1bk1/ppqb1ppp/2p1p3/6P1/2PPN3/PB3Q2/1P3P1P/1K1RR3 w - - 0 1 Analysis by Fritz 7: 1.g6 fxg6 2.Ng5 Bd6 3.c5 Bxh2 4.Qh3 h6 5.Nxe6 ± (0.97) Depth: 9/25 00:00:00 266kN 1.g6 hxg6 2.Ng5 Bc8 3.Qh3 Bd6 4.Qh7+ Kf8 5.Qh8+ Ke7 6.Qxg7 Ke8 7.Qg8+ Bf8 ± (1.06) Depth: 10/27 00:00:01 1076kN 1.g6 hxg6 2.Ng5 Bc8 3.Qh3 Bd6 4.Qh7+ Kf8 5.Qh8+ Ke7 6.Qxg7 Ke8 7.Qg8+ Bf8 8.c5 ± (1.22) Depth: 11/32 00:00:04 2545kN 1.g6 fxg6 2.Ng5 Re8 3.Qf7+ Kh8 4.Nxh7 Kxh7 5.Re3 Qxh2 6.Rdd3 Qh1+ 7.Ka2 e5 8.Qxd7 ± (1.31) Depth: 12/35 00:00:16 10919kN 1.g6 fxg6 2.Ng5 Bc8 3.c5 Re8 4.Qh3 h6 5.Nxe6 Bxe6 6.Rxe6 Kh7 +- (1.56) Depth: 13/33 00:00:49 31942kN 1.Nf6+! +- (1.59) Depth: 13/35 00:01:08 44476kN 1.Nf6+! +- (1.75) Depth: 13/38 00:01:16 50175kN 1.Nf6+! +- (2.06) Depth: 13/38 00:01:28 57983kN 1.Nf6+! +- (2.34) Depth: 14/38 00:02:07 84101kN 1.Nf6+! +- (2.63) Depth: 14/38 00:02:46 110940kN 1.Nf6+! +- (3.19) Depth: 14/40 00:05:51 239110kN (Hall, Privat 27.01.2002) > >Tao solves this in a couple of minutes (I believe 4 minutes to resolve the fail >high). But with futility pruning turned on it doesn't. I am curious how it >affects Fritz solution time. Fritz and CM see it pretty quick, in about 2 >minutes. > >Best regards, >Bas. > >On January 27, 2002 at 03:59:21, Ernst Walet wrote: > >>On January 26, 2002 at 20:02:29, Bas Hamstra wrote: >> >>>On January 26, 2002 at 16:42:23, Ernst Walet wrote: >>> >>>>On January 26, 2002 at 12:48:46, German Rodriguez wrote: >>>> >>>>>When I click on defaults in the F7 engine parameters, futility pruning is >>>>>enabled as default on my copy. No one has brought this up, so is it just me that >>>>>this happens to? >>>>> >>>>>Won't this do more harm than good in longer time controls and therefore should >>>>>it be left unchecked? >>>> >>>>Yes I noticed it too and futhermore the option for mate extentions is gone. >>>> >>>>I haven't found a position though where this pruning resulted in not finding a >>>>move, or taking much more time. Maybe someone else did? >>>> >>>>Ernst. >>> >>>Try the move Nf6+!! that Ponomariov played with and without. >>> >>>Bas. >> >> >>Can post the position for me, Bas? >> >>Thanks, >>Ernst.
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