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Reset bestMove before entering main moves loop
After razoring, IID, null verification and singular extension searches we have could have a dirty ss->bestMove, restore to MOVE_NONE before to enter moves loop. This should avoid to store in TT a stale move when we fail low. Tested together with previous patch that is the one that gives ELO. After 1152 games at 1+0 on my QUAD Mod vs Orig +233 =716 -203 (+9 ELO) Signed-off-by: Marco Costalba <email@example.com>
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