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Code Issues Releases Wiki Activity

Correct qsearch() TT save

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Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Joona Kiiski 2010-01-29 10:13:21 +02:00 • committed by Marco Costalba
parent bd358533a4
commit b651e5334b
1 changed files with 5 additions and 2 deletions
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7
src/search.cpp
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@ -1805,6 +1805,7 @@ namespace {
const TTEntry* tte = NULL;
int moveCount = 0;
bool pvNode = (beta - alpha != 1);
Value oldAlpha = alpha;
// Initialize, and make an early exit in case of an aborted search,
// an instant draw, maximum ply reached, etc.
@ -1948,14 +1949,14 @@ namespace {
// Update transposition table
Depth d = (depth == Depth(0) ? Depth(0) : Depth(-1));
if (bestValue < beta)
if (bestValue <= oldAlpha)
{
// If bestValue isn't changed it means it is still the static evaluation
// of the node, so keep this info to avoid a future evaluation() call.
ValueType type = (bestValue == staticValue && !ei.futilityMargin ? VALUE_TYPE_EV_UP : VALUE_TYPE_UPPER);
TT.store(pos.get_key(), value_to_tt(bestValue, ply), type, d, MOVE_NONE);
}
else
else if (bestValue >= beta)
{
move = ss[ply].pv[ply];
TT.store(pos.get_key(), value_to_tt(bestValue, ply), VALUE_TYPE_LOWER, d, move);
@ -1964,6 +1965,8 @@ namespace {
if (!pos.move_is_capture_or_promotion(move))
update_killers(move, ss[ply]);
}
else
TT.store(pos.get_key(), value_to_tt(bestValue, ply), VALUE_TYPE_EXACT, d, ss[ply].pv[ply]);
assert(bestValue > -VALUE_INFINITE && bestValue < VALUE_INFINITE);