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Save static evaluation also for failed low nodes

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When a node fails low and bestValue is still equal to
the original static node evaluation, then save this
in TT along with usual info.

This will allow us to avoid a future costly evaluation() call.

This patch extends to failed low nodes what we already do
for failed high ones.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2009-09-18 10:32:57 +02:00
parent e145c0d3e2
commit 9741694fca
3 changed files with 12 additions and 6 deletions
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4
src/tt.cpp
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@@ -121,8 +121,8 @@ void TranspositionTable::store(const Key posKey, Value v, ValueType t, Depth d,
{
if (!tte->key() || tte->key() == posKey32) // empty or overwrite old
{
// Do not overwrite when new type is VALUE_TYPE_EVAL
if (tte->key() && t == VALUE_TYPE_EVAL)
// Do not overwrite when new type is VALUE_TYPE_EV_LO
if (tte->key() && t == VALUE_TYPE_EV_LO)
return;
if (m == MOVE_NONE)