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Fix no previous moves on root.
authorperegrineshahin <peregrineshahin@gmail.com>
Sun, 4 Jun 2023 21:59:31 +0000 (00:59 +0300)
committerJoost VandeVondele <Joost.VandeVondele@gmail.com>
Tue, 6 Jun 2023 19:07:43 +0000 (21:07 +0200)
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


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