int64_t nodes;
Move move;
Depth depth, ext, newDepth;
- Value value, evalMargin, alpha, beta;
+ Value value, alpha, beta;
bool isCheck, moveIsCheck, captureOrPromotion, dangerous;
int researchCountFH, researchCountFL;
// Step 5. Evaluate the position statically
// At root we do this only to get reference value for child nodes
- ss->eval = isCheck ? VALUE_NONE : evaluate(pos, evalMargin);
+ ss->evalMargin = VALUE_NONE;
+ ss->eval = isCheck ? VALUE_NONE : evaluate(pos, ss->evalMargin);
// Step 6. Razoring (omitted at root)
// Step 7. Static null move pruning (omitted at root)
Key posKey;
Move ttMove, move, excludedMove, threatMove;
Depth ext, newDepth;
- Value bestValue, value, evalMargin, oldAlpha;
+ Value bestValue, value, oldAlpha;
Value refinedValue, nullValue, futilityBase, futilityValueScaled; // Non-PV specific
bool isCheck, singleEvasion, singularExtensionNode, moveIsCheck, captureOrPromotion, dangerous;
bool mateThreat = false;
// Step 5. Evaluate the position statically and
// update gain statistics of parent move.
if (isCheck)
- ss->eval = evalMargin = VALUE_NONE;
+ ss->eval = ss->evalMargin = VALUE_NONE;
else if (tte)
{
assert(tte->static_value() != VALUE_NONE);
ss->eval = tte->static_value();
- evalMargin = tte->static_value_margin();
+ ss->evalMargin = tte->static_value_margin();
refinedValue = refine_eval(tte, ss->eval, ply);
}
else
{
- refinedValue = ss->eval = evaluate(pos, evalMargin);
- TT.store(posKey, VALUE_NONE, VALUE_TYPE_NONE, DEPTH_NONE, MOVE_NONE, ss->eval, evalMargin);
+ refinedValue = ss->eval = evaluate(pos, ss->evalMargin);
+ TT.store(posKey, VALUE_NONE, VALUE_TYPE_NONE, DEPTH_NONE, MOVE_NONE, ss->eval, ss->evalMargin);
}
// Save gain for the parent non-capture move
MovePicker& mp = SplitPoint ? *ss->sp->mp : mpBase;
CheckInfo ci(pos);
ss->bestMove = MOVE_NONE;
- singleEvasion = SplitPoint ? false : isCheck && mp.number_of_evasions() == 1;
- futilityBase = SplitPoint ? ss->eval : ss->eval + evalMargin;
+ singleEvasion = !SplitPoint && isCheck && mp.number_of_evasions() == 1;
+ futilityBase = ss->eval + ss->evalMargin;
singularExtensionNode = !SplitPoint
&& depth >= SingularExtensionDepth[PvNode]
&& tte
ValueType vt = (bestValue <= oldAlpha ? VALUE_TYPE_UPPER : bestValue >= beta ? VALUE_TYPE_LOWER : VALUE_TYPE_EXACT);
move = (bestValue <= oldAlpha ? MOVE_NONE : ss->bestMove);
- TT.store(posKey, value_to_tt(bestValue, ply), vt, depth, move, ss->eval, evalMargin);
+ TT.store(posKey, value_to_tt(bestValue, ply), vt, depth, move, ss->eval, ss->evalMargin);
// Update killers and history only for non capture moves that fails high
if ( bestValue >= beta
// Initialize search stack
init_ss_array(ss, PLY_MAX_PLUS_2);
- ss[0].eval = VALUE_NONE;
+ ss[0].eval = ss[0].evalMargin = VALUE_NONE;
count = 0;
// Generate all legal moves