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Don't prune TT move in qsearch even if SEE < 0
Even if SEE is negative there is always a good possibility that TT move is a cut move anyway. For instance a lot of BXN exchanges that have negative SEE can very easily be good exchanges. A nice side effect is a bit reduced frequency of see_sign() calls. After 643 games at 1+0 Mod vs Orig +174 =327 -142 52.49% 337.5/643 +17 ELO Signed-off-by: Marco Costalba <firstname.lastname@example.org>
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