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Subject: Something strange and incredibly counter-intuitive with crafty book...

Author: Dann Corbit

Date: 11:28:01 12/15/98


I ran my modified Crafty on my 945 megabyte PGN file.  I set values that I
though should remove *all* moves from the output file.  I have maxply set to 560
and minplayed set to 100.  I just wanted to get the game and move count.  Yet
there are twenty five thousand positions in the resulting book!!!
Here is the output:

parsed 111941117 moves (1496349 games).
found 0 errors during parsing.
discarded 0 moves (maxply=560).
discarded 74172434 moves (minplayed=100).
discarded 0 moves (win/lose=0.0%).
book contains 25126 unique positions.
deepest book line was 549 plies.
longest cluster of moves was 22.
time used: 127:34 cpu  127:35 elapsed.

Does anyone have any conceivable explanation as to how this could be possible?
I use extract to throw out any two games with the same PGN hash also.  It simply
boggles my tiny little mind.



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