Author: José de Jesús García Ruvalcaba
Date: 08:21:32 08/06/01
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On August 06, 2001 at 02:51:21, Mark Longridge wrote: >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. It does not mean that. It means "prune everything that does not win at least 55% as it loses (and deeper than 80 plies)." So a move which has 55 wins, 100 loses and some draws will be included. José. >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
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