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Cache evaluation score in qsearch
Instead of just drop evaluation score after stand pat logic save it in TT so to be reused if the same position occurs again. Note that we NEVER use the cached value apart to avoid an evaluation call, in particulary we never return to caller after a succesful tt hit. To accomodate this a new value type VALUE_TYPE_EVAL has been introduced so that ok_to_use_TT() always returns false. With this patch we cut about 15% of total evaluation calls. Signed-off-by: Marco Costalba <email@example.com>
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