Author: Mark Longridge
Date: 23:51:21 08/05/01
I recently updated my book for crafty by including all the games it's ever played, including some pretty bad ones. I started with all.pgn and inside crafty I typed: book create all.pgn 80 1 55 Now, my understanding was that the last argument meant "prune everything that did not win 55% of the time. Imagine my surprise when my computer as white played: 1. e4 c6 2. Ke2 d5 3. Kd3 dxe4+ 4. Kxe4 What the???? Fortunately it was an unrated game, which was actually an aborted game which never got passed move 5, _but_ when crafty does it's result pruning, there is still the case (like this game) where there was 1 game played, but no result. The no result games don't get pruned, so even if it's the worst chess opening there is, it's still included in the book.bin A bit careless on my part, but I was still surprised because if this line has 0 wins, it's win percentage is 0% and therefore should be pruned. Mark
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.