- TT.store(pos, value_to_tt(bestValue, ply), depth, MOVE_NONE, VALUE_TYPE_EXACT);
+ if (!pvNode)
+ {
+ Depth d = (depth == Depth(0) ? Depth(0) : Depth(-1));
+ Value v = value_to_tt(bestValue, ply);
+ TTEntry* e;
+ if (bestValue < beta)
+ e = TT.store(pos, v, d, MOVE_NONE, VALUE_TYPE_UPPER);
+ else
+ e = TT.store(pos, v, d, MOVE_NONE, VALUE_TYPE_LOWER);
+
+ assert(e && e == TT.retrieve(pos));
+ assert(!e->staticValue());
+
+ // If the just stored value happens to be equal to the static evaluation
+ // score then set the flag, so to avoid calling evaluation() next time we
+ // hit this position.
+ if (staticValue == v && !ei.futilityMargin)
+ e->setStaticValue();
+ }