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Do not razor after a null move
We don't want to return unproven null move fails high, so that if a position is so good that null move fails high we want to check this with real do_move() / undo_move() test, not just razoring the position because, from the opponent point of view, is very bad. These are tests results at 1+0 Mod vs Orig +252 -264 =483 49.40% Mod vs Toga II 1.4.1SE +365 -325 =309 52.00% So it seems a very slightly regression regarding orig version (but withing error bar) and a nice increase against Toga that is what we are interested most. Orig version scores 49.75% against Toga, so we welcome this change ;-) Signed-off-by: Marco Costalba <email@example.com>
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