QSEARCH_RECAPTURES, QRECAPTURES
};
- // An insertion sort, which sorts moves in descending order up to and including a given limit.
- // The order of moves smaller than the limit is left unspecified.
- // To keep the implementation simple, *begin is always included in the list of sorted moves.
- void partial_insertion_sort(ExtMove* begin, ExtMove* end, Value limit)
- {
- for (ExtMove *sortedEnd = begin + 1, *p = begin + 1; p < end; ++p)
+ // partial_insertion_sort() sorts moves in descending order up to and including
+ // a given limit. The order of moves smaller than the limit is left unspecified.
+ void partial_insertion_sort(ExtMove* begin, ExtMove* end, int limit) {
+
+ for (ExtMove *sortedEnd = begin, *p = begin + 1; p < end; ++p)
if (p->value >= limit)
{
ExtMove tmp = *p, *q;
- *p = *sortedEnd;
- for (q = sortedEnd; q != begin && *(q-1) < tmp; --q)
- *q = *(q-1);
+ *p = *++sortedEnd;
+ for (q = sortedEnd; q != begin && *(q - 1) < tmp; --q)
+ *q = *(q - 1);
*q = tmp;
- ++sortedEnd;
}
}
// pick_best() finds the best move in the range (begin, end) and moves it to
// the front. It's faster than sorting all the moves in advance when there
// are few moves, e.g., the possible captures.
- Move pick_best(ExtMove* begin, ExtMove* end)
- {
- std::swap(*begin, *std::max_element(begin, end));
- return *begin;
+ Move pick_best(ExtMove* begin, ExtMove* end) {
+
+ std::swap(*begin, *std::max_element(begin, end));
+ return *begin;
}
} // namespace
Square prevSq = to_sq((ss-1)->currentMove);
countermove = pos.this_thread()->counterMoves[pos.piece_on(prevSq)][prevSq];
+ killers[0] = ss->killers[0];
+ killers[1] = ss->killers[1];
stage = pos.checkers() ? EVASION : MAIN_SEARCH;
ttMove = ttm && pos.pseudo_legal(ttm) ? ttm : MOVE_NONE;
ttMove = ttm
&& pos.pseudo_legal(ttm)
&& pos.capture(ttm)
- && pos.see_ge(ttm, threshold)? ttm : MOVE_NONE;
+ && pos.see_ge(ttm, threshold) ? ttm : MOVE_NONE;
stage += (ttMove == MOVE_NONE);
}
template<>
void MovePicker::score<QUIETS>() {
- const HistoryStats& history = pos.this_thread()->history;
+ const ButterflyHistory& history = pos.this_thread()->history;
- const CounterMoveStats& cmh = *(ss-1)->counterMoves;
- const CounterMoveStats& fmh = *(ss-2)->counterMoves;
- const CounterMoveStats& fm2 = *(ss-4)->counterMoves;
+ const PieceToHistory& cmh = *(ss-1)->history;
+ const PieceToHistory& fmh = *(ss-2)->history;
+ const PieceToHistory& fm2 = *(ss-4)->history;
Color c = pos.side_to_move();
m.value = cmh[pos.moved_piece(m)][to_sq(m)]
+ fmh[pos.moved_piece(m)][to_sq(m)]
+ fm2[pos.moved_piece(m)][to_sq(m)]
- + history.get(c, m);
+ + history[c][from_to(m)];
}
template<>
void MovePicker::score<EVASIONS>() {
// Try captures ordered by MVV/LVA, then non-captures ordered by stats heuristics
- const HistoryStats& history = pos.this_thread()->history;
+ const ButterflyHistory& history = pos.this_thread()->history;
Color c = pos.side_to_move();
for (auto& m : *this)
if (pos.capture(m))
m.value = PieceValue[MG][pos.piece_on(to_sq(m))]
- - Value(type_of(pos.moved_piece(m))) + HistoryStats::Max;
+ - Value(type_of(pos.moved_piece(m))) + (1 << 28);
else
- m.value = history.get(c, m);
+ m.value = history[c][from_to(m)];
}
endMoves = generate<CAPTURES>(pos, cur);
score<CAPTURES>();
++stage;
+ /* fallthrough */
case GOOD_CAPTURES:
while (cur < endMoves)
move = pick_best(cur++, endMoves);
if (move != ttMove)
{
- if (pos.see_ge(move, VALUE_ZERO))
+ if (pos.see_ge(move))
return move;
// Losing capture, move it to the beginning of the array
}
++stage;
- move = ss->killers[0]; // First killer move
+ move = killers[0]; // First killer move
if ( move != MOVE_NONE
&& move != ttMove
&& pos.pseudo_legal(move)
&& !pos.capture(move))
return move;
+ /* fallthrough */
case KILLERS:
++stage;
- move = ss->killers[1]; // Second killer move
+ move = killers[1]; // Second killer move
if ( move != MOVE_NONE
&& move != ttMove
&& pos.pseudo_legal(move)
&& !pos.capture(move))
return move;
+ /* fallthrough */
case COUNTERMOVE:
++stage;
move = countermove;
if ( move != MOVE_NONE
&& move != ttMove
- && move != ss->killers[0]
- && move != ss->killers[1]
+ && move != killers[0]
+ && move != killers[1]
&& pos.pseudo_legal(move)
&& !pos.capture(move))
return move;
+ /* fallthrough */
case QUIET_INIT:
cur = endBadCaptures;
endMoves = generate<QUIETS>(pos, cur);
score<QUIETS>();
-
- partial_insertion_sort(cur, endMoves,
- depth < 3 * ONE_PLY ? VALUE_ZERO : Value(INT_MIN));
+ partial_insertion_sort(cur, endMoves, -4000 * depth / ONE_PLY);
++stage;
+ /* fallthrough */
case QUIET:
while ( cur < endMoves
move = *cur++;
if ( move != ttMove
- && move != ss->killers[0]
- && move != ss->killers[1]
+ && move != killers[0]
+ && move != killers[1]
&& move != countermove)
return move;
}
++stage;
cur = moves; // Point to beginning of bad captures
+ /* fallthrough */
case BAD_CAPTURES:
if (cur < endBadCaptures)
endMoves = generate<EVASIONS>(pos, cur);
score<EVASIONS>();
++stage;
+ /* fallthrough */
case ALL_EVASIONS:
while (cur < endMoves)
endMoves = generate<CAPTURES>(pos, cur);
score<CAPTURES>();
++stage;
+ /* fallthrough */
case PROBCUT_CAPTURES:
while (cur < endMoves)
endMoves = generate<CAPTURES>(pos, cur);
score<CAPTURES>();
++stage;
+ /* fallthrough */
case QCAPTURES_1: case QCAPTURES_2:
while (cur < endMoves)
cur = moves;
endMoves = generate<QUIET_CHECKS>(pos, cur);
++stage;
+ /* fallthrough */
case QCHECKS:
while (cur < endMoves)
endMoves = generate<CAPTURES>(pos, cur);
score<CAPTURES>();
++stage;
+ /* fallthrough */
case QRECAPTURES:
while (cur < endMoves)
projects / stockfish / blobdiff