Author: Matthew White
Date: 15:56:29 07/23/03
Go up one level in this thread
On July 23, 2003 at 16:09:50, Tord Romstad wrote: >On July 23, 2003 at 15:24:18, Matthew White wrote: > >>[D]8/5p1k/6pp/8/q2QB3/2K4P/1p3P2/8 b - - 0 45 >> >>From Levin (2331) - IM Donaldson, Western States Open 2003 (analysis) >>The move actually played was 45... Qa1? 46. Bxg6+!! and draw by perpetual check >>Can your engine find the winning 45... b1=N+!! 46. Bxb1 Qa1+ and black enters >>the endgame a pawn up >> >>Every engine that I have tested finds it eventually. However, some do take >>longer than others :). > >Really? Which programs need time to find this move? Gothmog finds it at ply 1 >after 0.00 seconds: > > 1 -0.62 0.00 6 a4d4 c3d4 > 1 > -0.62 0.00 72 b2b1N > 1 1.74 0.00 134 b2b1N e4b1 a4a1 c3d3 a1b1 d3e3 > 2 1.74 0.00 858 b2b1N e4b1 a4a1 c3d3 a1b1 d3e3 > 3 2.07 0.01 1892 b2b1N e4b1 a4a1 c3d3 a1b1 d3e2 > 4 2.07 0.02 5245 b2b1N e4b1 a4a1 c3d3 a1b1 d3e2 > 5 2.31 0.13 25439 b2b1N e4b1 a4a1 c3d3 a1b1 d3e2 f7f5 d4d7 > h7h8 > 6 2.12 0.24 49236 b2b1N e4b1 a4a1 c3d3 a1b1 d3e2 b1c2 e2f1 > c2c1 f1g2 > 7 2.25 0.57 133399 b2b1N e4b1 a4a1 c3d3 a1b1 d3e2 b1h1 d4f6 > h1d5 > 8 2.23 1.74 448236 b2b1N e4b1 a4a1 c3d3 a1b1 d3e2 b1c1 d4d2 > c1h1 > 9 2.16 5.69 1564170 b2b1N e4b1 a4a1 c3d3 a1b1 d3e2 b1b3 h3h4 > b3c2 e2f1 c2c1 f1g2 >10 2.12 13.98 3946148 b2b1N e4b1 a4a1 c3d3 a1b1 d3e2 b1b3 h3h4 > b3e6 e2f1 e6c6 f1g1 > >Thanks for the test! In fact I implemented underpromotions in Gothmog >yesterday, and now I know that it works! :-) > >Tord Crafty 19.1 took a while on my machine at home. Something like 13 ply... Doctor? 4.2 took quite a while as well. Matt
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.