Author: Tord Romstad
Date: 06:41:26 03/04/04
Go up one level in this thread
On March 03, 2004 at 06:04:29, Sune Fischer wrote: >On March 03, 2004 at 04:18:30, Paul Byrne wrote: > >>Granted, it is not a terribly useful position, as it came from a wild 8 (pawns >>start on 4th rank) game on ICC between 2 patzers. And a very short search will >>get you a score of +10 to +15 and better in white's favor. >> >>It is, however, surprisingly tough to see the mate, and makes an interesting >>test position... >> >>r1b3n1/6k1/1n6/pP3qPQ/2PP2p1/1p4b1/4B3/R1BK2NR w - - 0 15 >> >>Guildenstern's normal search cannot see it here, while it's PN search gets it in >>under 30 seconds on an athlon 2400+. The line the PN search produces is mate in >>19, but is likely not optimal, as PN search is not terribly concerned with >>winning in the least number of moves. >> >>So, what programs can see the win from here? > >Not mine, I get a +22 score though. Mine also doesn't find it. After 11 plies, the score is +29. The problem might be that my search is "lazy" for the winning side in positions where one side seems to have a winning advantage. I don't extend checks, mate threats and other attacking moves as much as I would do if the score were close to 0. The idea is that it is more important to spend time looking for deep refutations of the apparent win than looking for an even more crushing win. >How about this one from one of my recent games. >I get a +13 score in a minute but no mate, I wonder if there is a mate >within reach of any program? > >[D]r4rk1/ppqb1Nbp/2n3p1/8/3PN1P1/1BP1Q2P/PP6/R4RK1 w - - 0 23 I don't find any. After 13 plies, the score is +16. Tord
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.