Author: Ricardo Gibert
Date: 13:13:17 10/09/02
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On October 09, 2002 at 13:28:50, Mike S. wrote: >Percentages, based on a large comp-comp database: > >Engine | #Games total W B | total eQE* W/eQE B/eQE >------------------------------------------------------------------- >Fritz 7 | 784 69% 72% 65% | 59% (#57) 53% 67% >Chess Tiger 14 | 850 66% 71% 62% | 72% (#71) 73% 71% >Shredder 6/-P. | 743 61% 65% 57% | 58% (#58) 63% 53% >Junior 7 | 799 55% 58% 53% | 41% (#60) 25% ! 56% > >*) "eQE" = early queen exchange (within the first 10 moves) None of the engines seem to fair too badly as Black when there is an exchange of queens. The picture is different as white for Fritz and Junior. It seems the statistics are sensitive to color! I suspect engine performance in the ending is sensitive to opening repertoire used, e.g. gambits do poorly after an exchange of queens, so by not playing gambits an engine can improve their ending stats. Or maybe Fritz and Junior are better middlegame defenders, i.e. they are able to limp into a bad endings instead of getting mated in the middlegame. Many explanations are possible. It would be better to measure endgame performance using some type of test set. A while back someone tested various engines with various rook endings. Very interesting. I think that sort thing is the way to go if you want to test endgame performance. > >Fritz 7's white percentage after an early exchange of the queens was 53% only, >compared to it's general white average of 72%! Remarkable also Tiger 14's result >with black: Much better (71% to 62%) without queens. Desastrous was Junior 7's >result with white when the queens were off the board soon: only 25% (in 30 games >of that kind). > >It looks as if the engines each are very different, in how they depend on having >the queen... with Shredder 6/-Paderborn showing the smallest impact. > >For games with Black against Fritz 7 or Junior 7 (and probably against others >too for which I didn't search the statistics), it could be promising to have an >opening book which favours eQE variants... But that of course must not have >"wholes" in other (more common) lines, so it can't be done by simply generate an >opening tree based on an eQE games database only. > >Regards, >M.Scheidl
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