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Fix no previous moves on root.

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guards against no previous move existing if qSearch is called on the root node (i.e. when razoring).

Passed Non-regression STC:
https://tests.stockfishchess.org/tests/view/647d242d726f6b400e408143
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 53120 W: 14167 L: 13976 D: 24977
Ptnml(0-2): 109, 5597, 14981, 5740, 133

closes https://github.com/official-stockfish/Stockfish/pull/4604

Bench: 2551691
This commit is contained in:
peregrineshahin 2023-06-05 00:59:31 +03:00 • committed by Joost VandeVondele
parent 8dea070538
commit b60738e01b
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -1489,7 +1489,7 @@ moves_loop: // When in check, search starts here
// to search the moves. Because the depth is <= 0 here, only captures, // to search the moves. Because the depth is <= 0 here, only captures,
// queen promotions, and other checks (only if depth >= DEPTH_QS_CHECKS) // queen promotions, and other checks (only if depth >= DEPTH_QS_CHECKS)
// will be generated. // will be generated.
Square prevSq = (ss-1)->currentMove != MOVE_NULL ? to_sq((ss-1)->currentMove) : SQ_NONE; Square prevSq = is_ok((ss-1)->currentMove) ? to_sq((ss-1)->currentMove) : SQ_NONE;
MovePicker mp(pos, ttMove, depth, &thisThread->mainHistory, MovePicker mp(pos, ttMove, depth, &thisThread->mainHistory,
&thisThread->captureHistory, &thisThread->captureHistory,
contHist, contHist,