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Avoid permanent PV entries in TT

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This patch removes a condition that allows a PV entry to remain
in TT across games for an unlimited time.

Although this produces a nice ELO boost in the long term it
is an artifact that affects tests results bewteen version
with and without this feature.

So remove now and readd before to release because it actually
seems a strong feature.

As example a verification tournament against SF 2.0.1 starting around
+10 ELO after 4K games sligltly climbed to +21 ELO after 14K games !!!

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2011-02-16 08:56:24 +01:00
parent 4ead60e2a7
commit 6a19f5832a
1 changed files with 1 additions and 1 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 || tte->type() == VALUE_TYPE_EXACT ? -2 : 0);
c2 = (tte->generation() == generation ? -2 : 0);
c3 = (tte->depth() < replace->depth() ? 1 : 0);
if (c1 + c2 + c3 > 0)