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Simplify Mated Conditions in Iterative Deepening

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Follow-up to #6785

After completing an iteration, the engine verifies if a "mate in x" condition is met to stop searching. Currently, it checks is_mate() and is_mated() independently using two separate bulky logic branches. However, VALUE_MATE equals 32000, so both a mate (e.g., 31998) and a mated score (e.g., -31998) satisfy VALUE_MATE - std::abs(score) == 2. By utilizing is_mate_or_mated() and applying std::abs(), we mathematically combine these checks into a single concise expression.

Can someone please help run a matetrack with a --mate 100 limit for this?

closes https://github.com/official-stockfish/Stockfish/pull/6829

No functional change
This commit is contained in:
FauziAkram
2026-05-19 18:41:36 +02:00
committed by Joost VandeVondele
parent 78d8f09bc8
commit 94984fe5cb
1 changed files with 2 additions and 4 deletions
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src/search.cpp
+2 -4
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@@ -508,10 +508,8 @@ bool Search::Worker::iterative_deepening() {
} }
// Have we found a "mate in x" after a completed iteration? // Have we found a "mate in x" after a completed iteration?
if (limits.mate && !threads.stop if (limits.mate && !threads.stop && is_mate_or_mated(rootMoves[0].score)
&& ((is_mate(rootMoves[0].score) && VALUE_MATE - rootMoves[0].score <= 2 * limits.mate) && VALUE_MATE - std::abs(rootMoves[0].score) <= 2 * limits.mate)
|| (is_mated(rootMoves[0].score)
&& VALUE_MATE + rootMoves[0].score <= 2 * limits.mate)))
threads.stop = true; threads.stop = true;
if (!mainThread) if (!mainThread)