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Subject: A study when Fruit2.2 performs better at depth 18 than Fruit2.2 Uri

Author: Uri Blass

Date: 06:08:12 10/23/05


[D]4qr2/4p2k/1p2P1pP/5P2/1P3P2/6Q1/8/3B1K2 w - - 0 1

The solution of this study is Ba4 b5 fxg6+

Fruit2.2 default can see high score at depth 18 with the right solution
Fruit2.2 Uri cannot see it even at depth 19(it can see Ba4 b5 Bc2 as the main
line)

At 120/40 Fruit2.2 default can play the right moves
Fruit2.2 Uri cannot find 2.fxg6+ when it gets depth 18 in a game when it already
got depth 18 for 1.Ba4

Fruit2.2 Uri has no problem to find high score for 2.fxg6 with clear hash at
depth 15
It seems that without clear hash 2.fxg6 is not in the pv so it is pruned by
Fruit2.2 Uri when with clear hash it has not the same problem.

I thought that history pruning=70 means less accuracy at the same depth relative
to history pruning=50 but I am even not sure about it after analyzing this
study.

Uri



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