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Do not use SEE in evasion scoring #819

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Oct 6, 2016
Merged

Do not use SEE in evasion scoring #819

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10 changes: 2 additions & 8 deletions src/movepick.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -159,19 +159,13 @@ void MovePicker::score<QUIETS>() {

template<>
void MovePicker::score<EVASIONS>() {
// Try winning and equal captures ordered by MVV/LVA, then non-captures ordered
// by history value, then bad captures and quiet moves with a negative SEE ordered
// by SEE value.
// Try captures ordered by MVV/LVA, then non-captures ordered by history value
const HistoryStats& history = pos.this_thread()->history;
const FromToStats& fromTo = pos.this_thread()->fromTo;
Color c = pos.side_to_move();
Value see;

for (auto& m : *this)
if ((see = pos.see_sign(m)) < VALUE_ZERO)
m.value = see - HistoryStats::Max; // At the bottom

else if (pos.capture(m))
if (pos.capture(m))
m.value = PieceValue[MG][pos.piece_on(to_sq(m))]
- Value(type_of(pos.moved_piece(m))) + HistoryStats::Max;
else
Expand Down