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Fix errouneus reset of ss->threatMove
After we set ss->threatMove we could go under a IID step that resets SearchStack ss and so also ss->threatMove. When later we use that field in futility pruning we have this set to MOVE_NONE ! The fix is to use a local variable and add threatMove to SplitPoint to pass this move to slaves. Spotted by Ralph Stoesser, fix suggested by Richard Vida. Signed-off-by: Marco Costalba <mcostalba@gmail.com>
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