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Don't compensate TT for evaluation drift

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It seems that it works better without compensation
of drifted value when saving static evaluation in TT.

After 818 games at 1+0

Mod vs Orig +217 =429 -172 52.75%  431.5/818  +19 ELO

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-09-18 12:12:22 +02:00
parent 77ac1e7953
commit 7c55b0e880
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -1556,7 +1556,7 @@ namespace {
{ {
// Store the score to avoid a future costly evaluation() call // Store the score to avoid a future costly evaluation() call
if (!isCheck && !tte && ei.futilityMargin == 0) if (!isCheck && !tte && ei.futilityMargin == 0)
TT.store(pos.get_key(), bestValue - ply, VALUE_TYPE_EVAL, Depth(-127*OnePly), MOVE_NONE); TT.store(pos.get_key(), value_to_tt(bestValue, ply), VALUE_TYPE_EVAL, Depth(-127*OnePly), MOVE_NONE);
return bestValue; return bestValue;
} }