// refine_eval() returns the transposition table score if possible, otherwise
// falls back on static position evaluation.
static Value refine_eval(TTEntry tte, Value v, Value defaultEval)
{
if ((((tte.type() & Bound.BOUND_LOWER) != 0) && v >= defaultEval)
|| (((tte.type() & Bound.BOUND_UPPER) != 0) && v < defaultEval))
return v;
return defaultEval;
}
static bool can_return_tt(TTEntry tte, Depth depth, Value v, Value beta)
{
return (tte.depth() >= depth
|| v >= Math.Max(ValueC.VALUE_MATE_IN_MAX_PLY, beta)
|| v < Math.Min(ValueC.VALUE_MATED_IN_MAX_PLY, beta))
&& ((((tte.type() & Bound.BOUND_LOWER) != 0) && v >= beta)
|| (((tte.type() & Bound.BOUND_UPPER) != 0) && v < beta));
}