Author: José Carlos
Date: 10:47:32 02/28/01
Go up one level in this thread
On February 28, 2001 at 07:43:23, Ed Schröder wrote: >On February 28, 2001 at 06:06:21, Ricardo Gibert wrote: > >>On February 28, 2001 at 05:11:30, Sune Larsson wrote: >> >>> >>> [D]8/1p3p1p/p4P1k/P4P1p/6pP/6Pq/5P2/5K2 w - - 0 1 >>> >>> >>> True story this time. The above position happened in a free game between >>> Dr J. Perlis and N.N., many years ago, in Germany I think. The good doctor >>> was a generous man and played without a queen from the start. So it's not >>> strange that he is missing one in the above position. And since we are >>> careful, scientific people we shall have a closer look at it with Fritz. >>> >>> Okey, white is a queen down, is standing in check right now, Fritz gives >>> 3 ways to go: >>> >>> 1.Ke2 -19.44 >>> 1.Ke1 -19.75 >>> 1.Kg1 -19.12 >>> >>> Guess it's time for a new game... In fact it is - because after >>> 1.Kg1! *black* is mated in 6 moves. >>> >>> Sune >> >>I tried this position on Gambit Tiger and got results I don't understand: >> >>00:00:00.2 -14.36 19 124852 Kg1 >>00:00:00.8 -13.46 20 209791 Kg1 >>00:00:00.6 -13.46 21 220376 Kg1 >>00:00:00.7 -14.36 21 275872 Kg1 >>00:00:04.8 -13.46 22 1611011 Kg1 >>00:00:04.4 -13.46 23 1624598 Kg1 >>00:00:05.8 -14.36 23 1937717 Kg1 >>00:00:53.9 -13.46 24 21645539 Kg1 >>00:00:53.3 -13.46 25 21750433 Kg1 >>00:00:54.1 -14.36 25 21949656 Kg1 >>00:01:02.7 -13.46 26 24990033 Kg1 >>00:01:03.4 -13.46 27 25264260 Kg1 >>00:01:06.7 -14.36 27 26269213 Kg1 >> >>It likes Black so it does not seem to see the mate. At this point I forced it to >>play Kg1: >> >>00:00:00.6 -Mate in 6 17 120953 b5 axb6ep a5 b7 Qxh4 gxh4 g3 b8Q gxf2+ Kxf2 a4 >>Qf8# >>00:00:00.8 -Mate in 6 17 178642 b5 axb6ep a5 b7 Qxh4 gxh4 g3 b8Q gxf2+ Kxf2 a4 >>Qf8# >>00:00:01.6 -Mate in 6 18 433243 b5 axb6ep a5 b7 Qxh4 gxh4 g3 b8Q gxf2+ Kxf2 a4 >>Qf8# >>00:00:04.5 -Mate in 6 19 1180581 b5 axb6ep a5 b7 Qxh4 gxh4 g3 b8Q gxf2+ Kxf2 a4 >>Qf8# >>00:00:12.0 -Mate in 6 20 3604732 b5 axb6ep a5 b7 Qxh4 gxh4 g3 b8Q gxf2+ Kxf2 a4 >>Qf8# >>00:00:42.5 -Mate in 6 21 12558570 b5 axb6ep a5 b7 Qxh4 gxh4 g3 b8Q gxf2+ Kxf2 a4 >>Qf8# >> >>It sees the mate just fine, so now I made it take back Kg1: >> >>00:00:00.9 Conversion in -10043 32 3 Kg1 >>00:00:01.9 Conversion in -9998 32 Kg1 >>00:00:02.2 Conversion in -9953 33 Kg1 >>00:00:02.9 Conversion in -9908 34 Kg1 >>00:00:02.9 Conversion in -9863 35 Kg1 >>00:00:02.2 Conversion in -9818 36 Kg1 >>00:00:02.6 Conversion in -9773 37 Kg1 >>00:00:03.1 Conversion in -9728 38 Kg1 >>00:00:04.1 Conversion in -9683 39 Kg1 >>00:00:05.7 Conversion in -9638 40 Kg1 >>00:00:07.4 Conversion in -9593 41 Kg1 >>00:00:08.4 Conversion in -9548 42 Kg1 >>00:00:14.7 Conversion in -9503 43 Kg1 >>00:00:24.2 Conversion in -9458 44 Kg1 >>00:00:34.1 Conversion in -9413 45 Kg1 >>00:00:45.6 Conversion in -9368 46 Kg1 >>00:00:56.8 Conversion in -9323 47 Kg1 >>00:01:44.0 Conversion in -9278 48 Kg1 >>00:03:11.9 Conversion in -9233 49 Kg1 >> >>What's going on? What does it mean by, "Conversion in -nnnn"? Can it really get >>to Depth 49? > > >It is a bug which will be fixed in the upcoming update. In this specific >case the mate value is not converted in the right way. > >Ed And the first search not seeing the mate looks like a null-move issue, isn't it? José C.
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