Author: Enrique Irazoqui
Date: 05:22:00 10/30/99
I have played 2 matches at game/5 between Tiger 12.0 and Crafty 16.18 as an engine for Fritz. Crafty played on a PIII-500, 64MB hashtables, the Nalimov tablebases that come with Fritz and the General book of Fritz 5 built after games of 2500+ players. Tiger 12.0 played on a PII-300, 32MB hashtables and the small book of Tiger 11.7 with only 35000 positions. I used this book to compensate for Crafty not using its own. It was not uncommon to see Tiger out of book after 2, 3 or 4 moves. I don't think that the book gave Tiger any kind of advantage. In the first match, Tiger won 25-13, +19 -7 =12, scoring 65.7% The second match was played under the same conditions, except that Tiger had PB off. In this second match, Tiger won 23-21, +16 -14 =14, scoring 52.2%. Going back to the discussion of a few weeks ago about PB on/off, these 2 matches seem to indicate that PB off is not more detrimental than what could be expected by just not using the usual 50% of the opponent's time. The delay in transmitting the moves through auto232 is almost 3 seconds/move for the dos driver and about 2/10 for the windows driver. Considering that the average in these matches is 79 moves/game, each game lasted 14 minutes instead of 10. Assuming that both programs guessed 50% of the opponent's moves, Tiger and Crafty used 9.5 minutes/game (5 + 4.5) each with PB on, while in the second match Tiger used 5 minutes/game. It is as if Tiger would have played the first match on a P300 and the second on a P150. All this mess (sorry) makes the results of both matches quite coherent. I tried all this PB on/off thing in a different way. Didzis plays with 2 programs on one machine and PB off. I replayed with 2 machines one of his games Tiger-CM6K and both programs played the same moves. So it seems that for some programs playing with PB off has no other effect than having less time to compute. Enrique
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