Author: Peter McKenzie
Date: 03:36:42 02/22/99
Go up one level in this thread
On February 22, 1999 at 04:09:49, Will Singleton wrote: <snip> >New Feature > >I thought I'd post a position each week, taken from member submissions >from the current week's play. Recently on the CCC board we've had a few >positions posted, and these have helped me track down some problems with >my code. Probably just chance, but I think these things are helpful >for programmers in that they can see how their results differ from others, >and figure out why. this sounds like fun > >So members, please send me interesting games that your programs play (or >just the positions), and perhaps we can all benefit from the analyses. > >To start the ball rolling, here's a position from the game Amateur-LambChop, >played on ICC yesterday. For some reason, Amateur declined the easy move, >which would have won quickly, and played a tricky move that led to a loss. >On subsequent analysis, it took Amateur 9 ply to see the right move. During >the actual game (blitz), it only searched about 7 ply. I'm thinking this >might be some bug or other weirdness. Does your program have any trouble >finding the right move quickly? > >7k/2pn1Q2/2r4p/p1qpp3/Pp1b3N/1P1P2PP/2P1R2B/7K w - - LambChop likes Qxd7 after completing depth 1, 2, and 3. Then it switches to Nf5, which it sticks with for depths 4-8. Then back to Qxd7 for depths 9-10. Here we have the search output for depths 8-10 (output is depth, score [centipawns], time in 100ths of seconds, and node count to complete depth): 8 532 2700 295950 h4f5 c5f8 f7d7 c6g6 f5d4 f8f1 h2g1 g6g3 d7e8 h8h7 e8e7 g3g 7 9 395 28200 3776867 f7d7 c5f8 e2g2 c6d6 d7c7 d4b6 c7b7 f8f1 g2g1 f1f8 10 417 57000 7680080 f7d7 c5f8 h2g1 f8f1 e2g2 c6f6 h1h2 d4g1 g2g1 f1f2 g1g2 f6f 7 d7d5 Note the huge increase in node counts between depth 8 and 9! cheers, Peter
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.