along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
+#include <algorithm>
#include <cassert>
#include "movegen.h"
namespace {
enum MovegenPhase {
- PH_TT_MOVES, // Transposition table move and mate killer
- PH_GOOD_CAPTURES, // Queen promotions and captures with SEE values >= 0
+ PH_TT_MOVE, // Transposition table move
+ PH_GOOD_CAPTURES, // Queen promotions and captures with SEE values >= captureThreshold (captureThreshold <= 0)
+ PH_GOOD_PROBCUT, // Queen promotions and captures with SEE values > captureThreshold (captureThreshold >= 0)
PH_KILLERS, // Killer moves from the current ply
- PH_NONCAPTURES, // Non-captures and underpromotions
- PH_BAD_CAPTURES, // Queen promotions and captures with SEE values < 0
+ PH_NONCAPTURES_1, // Non-captures and underpromotions with positive score
+ PH_NONCAPTURES_2, // Non-captures and underpromotions with non-positive score
+ PH_BAD_CAPTURES, // Queen promotions and captures with SEE values < captureThreshold (captureThreshold <= 0)
PH_EVASIONS, // Check evasions
PH_QCAPTURES, // Captures in quiescence search
+ PH_QRECAPTURES, // Recaptures in quiescence search
PH_QCHECKS, // Non-capture checks in quiescence search
PH_STOP
};
CACHE_LINE_ALIGNMENT
- const uint8_t MainSearchTable[] = { PH_TT_MOVES, PH_GOOD_CAPTURES, PH_KILLERS, PH_NONCAPTURES, PH_BAD_CAPTURES, PH_STOP };
- const uint8_t EvasionTable[] = { PH_TT_MOVES, PH_EVASIONS, PH_STOP };
- const uint8_t QsearchWithChecksTable[] = { PH_TT_MOVES, PH_QCAPTURES, PH_QCHECKS, PH_STOP };
- const uint8_t QsearchWithoutChecksTable[] = { PH_TT_MOVES, PH_QCAPTURES, PH_STOP };
+ const uint8_t MainSearchTable[] = { PH_TT_MOVE, PH_GOOD_CAPTURES, PH_KILLERS, PH_NONCAPTURES_1, PH_NONCAPTURES_2, PH_BAD_CAPTURES, PH_STOP };
+ const uint8_t EvasionTable[] = { PH_TT_MOVE, PH_EVASIONS, PH_STOP };
+ const uint8_t QsearchWithChecksTable[] = { PH_TT_MOVE, PH_QCAPTURES, PH_QCHECKS, PH_STOP };
+ const uint8_t QsearchWithoutChecksTable[] = { PH_TT_MOVE, PH_QCAPTURES, PH_STOP };
+ const uint8_t QsearchRecapturesTable[] = { PH_TT_MOVE, PH_QRECAPTURES, PH_STOP };
+ const uint8_t ProbCutTable[] = { PH_TT_MOVE, PH_GOOD_PROBCUT, PH_STOP };
+
+ // Unary predicate used by std::partition to split positive scores from remaining
+ // ones so to sort separately the two sets, and with the second sort delayed.
+ inline bool has_positive_score(const MoveStack& move) { return move.score > 0; }
+
+ // Picks and pushes to the front the best move in range [firstMove, lastMove),
+ // it is faster than sorting all the moves in advance when moves are few, as
+ // normally are the possible captures.
+ inline MoveStack* pick_best(MoveStack* firstMove, MoveStack* lastMove)
+ {
+ std::swap(*firstMove, *std::max_element(firstMove, lastMove));
+ return firstMove;
+ }
}
-bool MovePicker::isBadCapture() const { return phase == PH_BAD_CAPTURES; }
-
-/// Constructor for the MovePicker class. As arguments we pass information
+/// Constructors for the MovePicker class. As arguments we pass information
/// to help it to return the presumably good moves first, to decide which
/// moves to return (in the quiescence search, for instance, we only want to
/// search captures, promotions and some checks) and about how important good
/// move ordering is at the current node.
MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const History& h,
- SearchStack* ss, Value beta) : pos(p), H(h) {
- badCaptureThreshold = 0;
+ Search::Stack* ss, Value beta) : pos(p), H(h), depth(d) {
+ captureThreshold = 0;
badCaptures = moves + MAX_MOVES;
assert(d > DEPTH_ZERO);
killers[0].move = ss->killers[0];
killers[1].move = ss->killers[1];
- // Consider sligtly negative captures as good if at low
- // depth and far from beta.
+ // Consider sligtly negative captures as good if at low depth and far from beta
if (ss && ss->eval < beta - PawnValueMidgame && d < 3 * ONE_PLY)
- badCaptureThreshold = -PawnValueMidgame;
+ captureThreshold = -PawnValueMidgame;
+
+ // Consider negative captures as good if still enough to reach beta
+ else if (ss && ss->eval > beta)
+ captureThreshold = beta - ss->eval;
phasePtr = MainSearchTable;
}
- ttMove = (ttm && pos.move_is_pl(ttm) ? ttm : MOVE_NONE);
+ ttMove = (ttm && pos.is_pseudo_legal(ttm) ? ttm : MOVE_NONE);
phasePtr += int(ttMove == MOVE_NONE) - 1;
go_next_phase();
}
-MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const History& h)
+MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const History& h, Square recaptureSq)
: pos(p), H(h) {
assert(d <= DEPTH_ZERO);
phasePtr = EvasionTable;
else if (d >= DEPTH_QS_CHECKS)
phasePtr = QsearchWithChecksTable;
- else
+ else if (d >= DEPTH_QS_RECAPTURES)
{
phasePtr = QsearchWithoutChecksTable;
// Skip TT move if is not a capture or a promotion, this avoids
// qsearch tree explosion due to a possible perpetual check or
// similar rare cases when TT table is full.
- if (ttm != MOVE_NONE && !pos.move_is_capture(ttm) && !move_is_promotion(ttm))
+ if (ttm != MOVE_NONE && !pos.is_capture_or_promotion(ttm))
ttm = MOVE_NONE;
}
+ else
+ {
+ phasePtr = QsearchRecapturesTable;
+ recaptureSquare = recaptureSq;
+ ttm = MOVE_NONE;
+ }
- ttMove = (ttm && pos.move_is_pl(ttm) ? ttm : MOVE_NONE);
+ ttMove = (ttm && pos.is_pseudo_legal(ttm) ? ttm : MOVE_NONE);
+ phasePtr += int(ttMove == MOVE_NONE) - 1;
+ go_next_phase();
+}
+
+MovePicker::MovePicker(const Position& p, Move ttm, const History& h, PieceType parentCapture)
+ : pos(p), H(h) {
+
+ assert (!pos.in_check());
+
+ // In ProbCut we consider only captures better than parent's move
+ captureThreshold = PieceValueMidgame[Piece(parentCapture)];
+ phasePtr = ProbCutTable;
+
+ if ( ttm != MOVE_NONE
+ && (!pos.is_capture(ttm) || pos.see(ttm) <= captureThreshold))
+ ttm = MOVE_NONE;
+
+ ttMove = (ttm && pos.is_pseudo_legal(ttm) ? ttm : MOVE_NONE);
phasePtr += int(ttMove == MOVE_NONE) - 1;
go_next_phase();
}
phase = *(++phasePtr);
switch (phase) {
- case PH_TT_MOVES:
+ case PH_TT_MOVE:
lastMove = curMove + 1;
return;
case PH_GOOD_CAPTURES:
+ case PH_GOOD_PROBCUT:
lastMove = generate<MV_CAPTURE>(pos, moves);
score_captures();
return;
lastMove = curMove + 2;
return;
- case PH_NONCAPTURES:
- lastMove = generate<MV_NON_CAPTURE>(pos, moves);
+ case PH_NONCAPTURES_1:
+ lastNonCapture = lastMove = generate<MV_NON_CAPTURE>(pos, moves);
score_noncaptures();
- sort_moves(moves, lastMove, &lastGoodNonCapture);
+ lastMove = std::partition(curMove, lastMove, has_positive_score);
+ sort<MoveStack>(curMove, lastMove);
+ return;
+
+ case PH_NONCAPTURES_2:
+ curMove = lastMove;
+ lastMove = lastNonCapture;
+ if (depth >= 3 * ONE_PLY)
+ sort<MoveStack>(curMove, lastMove);
return;
case PH_BAD_CAPTURES:
score_captures();
return;
+ case PH_QRECAPTURES:
+ lastMove = generate<MV_CAPTURE>(pos, moves);
+ return;
+
case PH_QCHECKS:
lastMove = generate<MV_NON_CAPTURE_CHECK>(pos, moves);
return;
/// MovePicker::score_captures(), MovePicker::score_noncaptures() and
/// MovePicker::score_evasions() assign a numerical move ordering score
/// to each move in a move list. The moves with highest scores will be
-/// picked first by get_next_move().
+/// picked first by next_move().
void MovePicker::score_captures() {
// Winning and equal captures in the main search are ordered by MVV/LVA.
for (MoveStack* cur = moves; cur != lastMove; cur++)
{
m = cur->move;
- if (move_is_promotion(m))
- cur->score = QueenValueMidgame;
- else
- cur->score = pos.midgame_value_of_piece_on(move_to(m))
- - pos.type_of_piece_on(move_from(m));
+ cur->score = PieceValueMidgame[pos.piece_on(move_to(m))]
+ - type_of(pos.piece_on(move_from(m)));
+
+ if (is_promotion(m))
+ cur->score += PieceValueMidgame[Piece(promotion_piece_type(m))];
}
}
m = cur->move;
if ((seeScore = pos.see_sign(m)) < 0)
cur->score = seeScore - History::MaxValue; // Be sure we are at the bottom
- else if (pos.move_is_capture(m))
- cur->score = pos.midgame_value_of_piece_on(move_to(m))
- - pos.type_of_piece_on(move_from(m)) + History::MaxValue;
+ else if (pos.is_capture(m))
+ cur->score = PieceValueMidgame[pos.piece_on(move_to(m))]
+ - type_of(pos.piece_on(move_from(m))) + History::MaxValue;
else
cur->score = H.value(pos.piece_on(move_from(m)), move_to(m));
}
}
-/// MovePicker::get_next_move() is the most important method of the MovePicker
-/// class. It returns a new pseudo legal move every time it is called, until there
+/// MovePicker::next_move() is the most important method of the MovePicker class.
+/// It returns a new pseudo legal move every time it is called, until there
/// are no more moves left. It picks the move with the biggest score from a list
/// of generated moves taking care not to return the tt move if has already been
/// searched previously. Note that this function is not thread safe so should be
/// lock protected by caller when accessed through a shared MovePicker object.
-Move MovePicker::get_next_move() {
+Move MovePicker::next_move() {
Move move;
switch (phase) {
- case PH_TT_MOVES:
+ case PH_TT_MOVE:
curMove++;
return ttMove;
break;
case PH_GOOD_CAPTURES:
- move = pick_best(curMove++, lastMove).move;
+ move = pick_best(curMove++, lastMove)->move;
if (move != ttMove)
{
+ assert(captureThreshold <= 0); // Otherwise we must use see instead of see_sign
+
// Check for a non negative SEE now
int seeValue = pos.see_sign(move);
- if (seeValue >= badCaptureThreshold)
+ if (seeValue >= captureThreshold)
return move;
- // Losing capture, move it to the tail of the array, note
- // that move has now been already checked for pseudo legality.
+ // Losing capture, move it to the tail of the array
(--badCaptures)->move = move;
badCaptures->score = seeValue;
}
break;
+ case PH_GOOD_PROBCUT:
+ move = pick_best(curMove++, lastMove)->move;
+ if ( move != ttMove
+ && pos.see(move) > captureThreshold)
+ return move;
+ break;
+
case PH_KILLERS:
move = (curMove++)->move;
if ( move != MOVE_NONE
- && pos.move_is_pl(move)
+ && pos.is_pseudo_legal(move)
&& move != ttMove
- && !pos.move_is_capture(move))
+ && !pos.is_capture(move))
return move;
break;
- case PH_NONCAPTURES:
- // Sort negative scored moves only when we get there
- if (curMove == lastGoodNonCapture)
- insertion_sort<MoveStack>(lastGoodNonCapture, lastMove);
-
+ case PH_NONCAPTURES_1:
+ case PH_NONCAPTURES_2:
move = (curMove++)->move;
if ( move != ttMove
&& move != killers[0].move
break;
case PH_BAD_CAPTURES:
- move = pick_best(curMove++, lastMove).move;
+ move = pick_best(curMove++, lastMove)->move;
return move;
case PH_EVASIONS:
case PH_QCAPTURES:
- move = pick_best(curMove++, lastMove).move;
+ move = pick_best(curMove++, lastMove)->move;
if (move != ttMove)
return move;
break;
+ case PH_QRECAPTURES:
+ move = (curMove++)->move;
+ if (move_to(move) == recaptureSquare)
+ return move;
+ break;
+
case PH_QCHECKS:
move = (curMove++)->move;
if (move != ttMove)
projects / stockfish / blobdiff