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Revert "Adjustment of the aspiration window after fail high/low."

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This reverts commit bfc7000597.

Fixes https://github.com/official-stockfish/Stockfish/issues/6296

After this commit a bug has been reported when the position is close to
mate or being mated. Since no workarounds have been suggested yet, it
is best to revert this commit until a better solution is found.

closes https://github.com/official-stockfish/Stockfish/pull/6309

Bench: 2493363
This commit is contained in:
Syine Mineta
2025-09-13 08:18:52 +02:00
committed by Joost VandeVondele
parent bfc7000597
commit fc54d87301
1 changed files with 2 additions and 14 deletions
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src/search.cpp
+1 -13
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@@ -345,7 +345,6 @@ void Search::Worker::iterative_deepening() {
Depth adjustedDepth =
std::max(1, rootDepth - failedHighCnt - 3 * (searchAgainCounter + 1) / 4);
rootDelta = beta - alpha;
size_t previousBestMoveChanges = bestMoveChanges;
bestValue = search<Root>(rootPos, ss, alpha, beta, adjustedDepth, false);
// Bring the best move to the front. It is critical that sorting
@@ -373,9 +372,7 @@ void Search::Worker::iterative_deepening() {
// otherwise exit the loop.
if (bestValue <= alpha)
{
beta =
(alpha * 123 + beta * 9 + std::min(bestValue + delta, VALUE_INFINITE) * 12)
/ 144;
beta = alpha;
alpha = std::max(bestValue - delta, -VALUE_INFINITE);
failedHighCnt = 0;
@@ -384,15 +381,6 @@ void Search::Worker::iterative_deepening() {
}
else if (bestValue >= beta)
{
if (bestMoveChanges > previousBestMoveChanges)
alpha =
(alpha * 116 + beta + std::max(bestValue - delta, -VALUE_INFINITE) * 7)
/ 124;
else
alpha = (alpha * 119 + beta * 6
+ std::max(bestValue - delta, -VALUE_INFINITE) * 16)
/ 141;
beta = std::min(bestValue + delta, VALUE_INFINITE);
++failedHighCnt;
}