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Code Issues Releases Wiki Activity

New History Bonus Formula

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bonus = d^2 + d - 1

Bench: 8639247

Resolves #484
This commit is contained in:
VoyagerOne 2015-10-30 16:39:21 -04:00 • committed by Joona Kiiski
parent 8d858783e1
commit aa242d2f84
1 changed files with 3 additions and 3 deletions
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6
src/search.cpp
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@ -1095,7 +1095,7 @@ moves_loop: // When in check search starts from here
&& is_ok((ss - 1)->currentMove) && is_ok((ss - 1)->currentMove)
&& is_ok((ss - 2)->currentMove)) && is_ok((ss - 2)->currentMove))
{ {
Value bonus = Value((depth / ONE_PLY) * (depth / ONE_PLY)); Value bonus = Value((depth / ONE_PLY) * (depth / ONE_PLY) + depth / ONE_PLY -1);
Square prevPrevSq = to_sq((ss - 2)->currentMove); Square prevPrevSq = to_sq((ss - 2)->currentMove);
CounterMovesStats& prevCmh = CounterMovesHistory[pos.piece_on(prevPrevSq)][prevPrevSq]; CounterMovesStats& prevCmh = CounterMovesHistory[pos.piece_on(prevPrevSq)][prevPrevSq];
prevCmh.update(pos.piece_on(prevSq), prevSq, bonus); prevCmh.update(pos.piece_on(prevSq), prevSq, bonus);
@ -1371,7 +1371,7 @@ moves_loop: // When in check search starts from here
ss->killers[0] = move; ss->killers[0] = move;
} }
Value bonus = Value((depth / ONE_PLY) * (depth / ONE_PLY)); Value bonus = Value((depth / ONE_PLY) * (depth / ONE_PLY) + depth / ONE_PLY -1);
Square prevSq = to_sq((ss-1)->currentMove); Square prevSq = to_sq((ss-1)->currentMove);
CounterMovesStats& cmh = CounterMovesHistory[pos.piece_on(prevSq)][prevSq]; CounterMovesStats& cmh = CounterMovesHistory[pos.piece_on(prevSq)][prevSq];
@ -1401,7 +1401,7 @@ moves_loop: // When in check search starts from here
{ {
Square prevPrevSq = to_sq((ss-2)->currentMove); Square prevPrevSq = to_sq((ss-2)->currentMove);
CounterMovesStats& prevCmh = CounterMovesHistory[pos.piece_on(prevPrevSq)][prevPrevSq]; CounterMovesStats& prevCmh = CounterMovesHistory[pos.piece_on(prevPrevSq)][prevPrevSq];
prevCmh.update(pos.piece_on(prevSq), prevSq, -bonus - 2 * depth / ONE_PLY - 1); prevCmh.update(pos.piece_on(prevSq), prevSq, -bonus - 2 * ((depth + 1) / ONE_PLY));
} }
} }