Author: Eelco de Groot
Date: 10:42:46 10/19/04
Go up one level in this thread
On October 19, 2004 at 12:28:24, Anthony Cozzie wrote: >On October 19, 2004 at 12:13:49, Will Singleton wrote: > >>On October 19, 2004 at 10:37:36, Eelco de Groot wrote: >> >>>On October 19, 2004 at 09:09:42, Anthony Cozzie wrote: >>> >>>>[D]4r3/QbpR1ppk/pr5p/1pq1P3/2p1PP2/P5PP/1P4B1/3R3K w - - 0 27 >>>> >>>Pro Deo with custom settings also expects a draw after exchange of Rooks. Slow >>>Celeron 500 MHz, 28 Mb HT >>> >>>00:00:09.3 0,00 10 1159298 Rd8 Rxd8 Rxd8 Qe3 Qb8 Bxe4 Rh8+ Kg6 >Qxc7 Bxg2+ Kxg2 Qe2+ Kg1 Qe1+ Kh2 Qf2+ Kh1 Qf1+ Kh2 Qf2+ Kh1 Qf1+ Kh2 >> >>>00:06:18.7 0,00 13 63625473 Rd8 Rxd8 Rxd8 Qe3 Qb8 Bxe4 Rh8+ Kg6 >>>00:13:59.3 0,00 14 145222009 Rd8 Rxd8 Rxd8 Qe3 e6 Bxe4 exf7 Bxg2+ >>> >> >>Pro Deo looks like it has a problem. The pv for ply 9 is no draw, Qb8 should be >>e6. It still shows the bogus line for ply 13, finally finding the right move in >>ply 14. >> >>An engine that doesn't consider underpromos will never see the draw. > > >I am not sure it is a draw. Zappa had a draw score on Rd8 but eventually failed >low. Sadly I don't remember its PV :( > >anthony Sofar Rebel 12 does not fail low on 3.e6. I'm taking Will's comment about the underpromotion with a grain of salt, is the e-pawn supposed to promote to Knight? I believe I see White can force a draw with a Knight by a perpetual, but with a new queen it's Black who has to force a draw with perpetual check. I remember vaguely that Rebel doesn't do underpromotions in QSearch, but not in main search? After 1.Rd8 Rxd8 2Rxd8 Qe3 I think Black has at least a draw after 3.e6 [D]3R4/Qbp2ppk/pr5p/1p2P3/2p1PP2/P3q1PP/1P4B1/7K w - - 1 1 Custom settings g3i3 for old Rebel 12, with Singular Extensions and what not enabled, first plays 3.Qb8, then 3.e6 00:00:01.0 -0,45 1 324 Rd7 Bxe4 Bxe4+ Qxe4+ Kh2 00:00:01.1 0,00 1 757 e6 Qe1+ Kh2 fxe6 00:00:01.1 0,44 1 1042 Kh2 Bxe4 Bxe4+ Qxe4 Qxc7 00:00:01.1 0,15 2 1246 Kh2 Qf2 00:00:01.1 0,15 2 1835 Qb8 00:00:01.2 0,59 2 2141 Qb8 Qe1+ Kh2 00:00:01.2 0,59 3 3233 Qb8 Qe1+ Kh2 00:00:01.3 2,09 4 10323 Qb8 Bxe4 Rh8+ Kg6 Qxc7 00:00:01.3 2,09 5 17074 Qb8 Bxe4 Rh8+ Kg6 Qxc7 Bxg2+ 00:00:01.6 1,20 6 55122 Qb8 Qxe4 Rh8+ Kg6 Bxe4+ Bxe4+ Kh2 Rxb8 Rxb8 00:00:08.9 0,00 7 1217063 Qb8 Bxe4 Rh8+ Kg6 Qxc7 Bxg2+ Kxg2 Qe2+ Kh1 Qe1+ Kg2 Qe2+ Kh1 Qe1+ Kg2 00:00:10.5 0,00 8 1448937 Qb8 Bxe4 Rh8+ 00:00:42.9 -0,35 9 7081631 Qb8 Bxe4 Rh8+ Kg6 Qc8 Bxg2+ Kxg2 Qe2+ Kg1 Qd1+ 00:01:01.4 0,00 9 10229446 e6 Bxe4 exf7 Bxg2+ Kxg2 Qe2+ Kg1 Qe1+ Kh2 Qf2+ Kh1 Qe1+ Kh2 Qf2+ Kh1 Qe1+ 00:01:23.7 0,00 10 14130917 e6 Bxe4 exf7 Bxg2+ Kxg2 Qe2+ Kg1 Qe1+ 00:02:24.7 0,00 11 24982113 e6 Bxe4 exf7 Bxg2+ Kxg2 Qe2+ 00:05:59.1 0,00 12 60302530 e6 Bxe4 exf7 Bxg2+ Kxg2 Qe2+ Kg1 Qe1+ 00:16:55.1 0,00 13 173465343 e6 Bxe4 exf7 Bxg2+
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.