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Revert storing of TT when returning from "stand pat"

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After testing it seems patch is bad:

After 999 games 1+0: +242 -271 =486 -10 ELO

So restore saving of TT at the end but using new Joona
idea of storing as VALUE_TYPE_UPPER/VALUE_TYPE_LOWER instead
of VALUE_TYPE_EXACT.

Some optimization is still possible but better test new ideas
one by one.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-03-27 15:30:45 +01:00
parent 5a0581498c
commit dcdac83187
1 changed files with 14 additions and 7 deletions
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21
src/search.cpp
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@ -1475,15 +1475,12 @@ namespace {
Value bestValue = staticValue;
if (bestValue >= beta)
{
// Update transposition table before to leave
TT.store(pos, value_to_tt(bestValue, ply), depth, MOVE_NONE, VALUE_TYPE_EXACT);
return bestValue;
}
else if (!isCheck && !tte && ei.futilityMargin == 0)
{
// Store the score to avoid a future costly evaluation() call
TT.store(pos, value_to_tt(bestValue, ply), Depth(-127*OnePly), MOVE_NONE, VALUE_TYPE_EVAL);
if (!isCheck && !tte && ei.futilityMargin == 0)
TT.store(pos, value_to_tt(bestValue, ply), Depth(-127*OnePly), MOVE_NONE, VALUE_TYPE_EVAL);
return bestValue;
}
if (bestValue > alpha)
@ -1568,6 +1565,16 @@ namespace {
assert(bestValue > -VALUE_INFINITE && bestValue < VALUE_INFINITE);
// Update transposition table
if (!pvNode)
{
Depth d = (depth == Depth(0) ? Depth(0) : Depth(-1));
if (bestValue < beta)
TT.store(pos, value_to_tt(bestValue, ply), d, MOVE_NONE, VALUE_TYPE_UPPER);
else
TT.store(pos, value_to_tt(bestValue, ply), d, MOVE_NONE, VALUE_TYPE_LOWER);
}
// Update killers only for good check moves
Move m = ss[ply].currentMove;
if (alpha >= beta && ok_to_history(pos, m)) // Only non capture moves are considered