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Fix bestThread selection

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If multiple threads have the same best move,
pick the thread with the largest contribution to the confidence vote.
This thread will later be used to display PV, so this patch is
about user-friendliness and/or least surprises, it non-functional for playing strenght.

closes https://github.com/official-stockfish/Stockfish/pull/4246

No functional change
This commit is contained in:
Joost VandeVondele
2022-11-28 20:59:38 +01:00
parent c7118fb46d
commit d60f5de967
1 changed files with 8 additions and 6 deletions
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14
src/thread.cpp
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@@ -221,11 +221,14 @@ Thread* ThreadPool::get_best_thread() const {
minScore = std::min(minScore, th->rootMoves[0].score);
// Vote according to score and depth, and select the best thread
for (Thread* th : *this)
{
votes[th->rootMoves[0].pv[0]] +=
(th->rootMoves[0].score - minScore + 14) * int(th->completedDepth);
auto thread_value = [minScore](Thread* th) {
return (th->rootMoves[0].score - minScore + 14) * int(th->completedDepth);
};
for (Thread* th : *this)
votes[th->rootMoves[0].pv[0]] += thread_value(th);
for (Thread* th : *this)
if (abs(bestThread->rootMoves[0].score) >= VALUE_TB_WIN_IN_MAX_PLY)
{
// Make sure we pick the shortest mate / TB conversion or stave off mate the longest
@@ -236,9 +239,8 @@ Thread* ThreadPool::get_best_thread() const {
|| ( th->rootMoves[0].score > VALUE_TB_LOSS_IN_MAX_PLY
&& ( votes[th->rootMoves[0].pv[0]] > votes[bestThread->rootMoves[0].pv[0]]
|| ( votes[th->rootMoves[0].pv[0]] == votes[bestThread->rootMoves[0].pv[0]]
&& th->rootMoves[0].pv.size() > bestThread->rootMoves[0].pv.size()))))
&& thread_value(th) > thread_value(bestThread)))))
bestThread = th;
}
return bestThread;
}