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Use TT for pruning also in PV nodes

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Biggest advantage is be able to analize positions
without "loss of memory" when goind back/forth in
a position.

Patch has proven to fix analysys problems and is even
worths some elo points.

After 5811 games Mod- Orig:
1037 - 902 - 3872 +8 ELO  (+- 3.6) LOS 97%

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2011-01-31 13:05:01 +01:00
parent 2f6788104f
commit b366c7dc38
2 changed files with 20 additions and 10 deletions
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2
src/tt.cpp
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@@ -122,7 +122,7 @@ void TranspositionTable::store(const Key posKey, Value v, ValueType t, Depth d,
continue;
c1 = (replace->generation() == generation ? 2 : 0);
c2 = (tte->generation() == generation ? -2 : 0);
c2 = (tte->generation() == generation || tte->type() == VALUE_TYPE_EXACT ? -2 : 0);
c3 = (tte->depth() < replace->depth() ? 1 : 0);
if (c1 + c2 + c3 > 0)