along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
-
-////
-//// Includes
-////
-
#include <cassert>
#include "history.h"
#include "movegen.h"
#include "movepick.h"
#include "search.h"
-#include "value.h"
-
-
-////
-//// Local definitions
-////
+#include "types.h"
namespace {
}
-////
-//// Functions
-////
-
-
/// Constructor for the MovePicker class. Apart from the position for which
/// it is asked to pick legal moves, MovePicker also wants some information
/// to help it to return the presumably good moves first, to decide which
badCaptureThreshold = 0;
badCaptures = moves + MOVES_MAX;
+ assert(d > DEPTH_ZERO);
+
pinned = p.pinned_pieces(pos.side_to_move());
- if (ss && !p.is_check())
+ if (p.is_check())
+ {
+ ttMoves[1].move = killers[0].move = killers[1].move = MOVE_NONE;
+ phasePtr = EvasionsPhaseTable;
+ }
+ else
{
ttMoves[1].move = (ss->mateKiller == ttm) ? MOVE_NONE : ss->mateKiller;
searchTT |= ttMoves[1].move;
killers[0].move = ss->killers[0];
killers[1].move = ss->killers[1];
- } else
- ttMoves[1].move = killers[0].move = killers[1].move = MOVE_NONE;
- if (p.is_check())
- phasePtr = EvasionsPhaseTable;
- else if (d > DEPTH_ZERO)
- {
// Consider sligtly negative captures as good if at low
// depth and far from beta.
if (ss && ss->eval < beta - PawnValueMidgame && d < 3 * ONE_PLY)
phasePtr = MainSearchPhaseTable;
}
+
+ phasePtr += int(!searchTT) - 1;
+ go_next_phase();
+}
+
+MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const History& h)
+ : pos(p), H(h) {
+ int searchTT = ttm;
+ ttMoves[0].move = ttm;
+ ttMoves[1].move = MOVE_NONE;
+
+ assert(d <= DEPTH_ZERO);
+
+ pinned = p.pinned_pieces(pos.side_to_move());
+
+ if (p.is_check())
+ phasePtr = EvasionsPhaseTable;
else if (d >= DEPTH_QS_CHECKS)
phasePtr = QsearchWithChecksPhaseTable;
else
}
void MovePicker::score_noncaptures() {
- // First score by history, when no history is available then use
- // piece/square tables values. This seems to be better then a
- // random choice when we don't have an history for any move.
+ // Score by history and max gain for the move.
Move m;
Piece piece;
Square from, to;
case PH_TT_MOVES:
move = (curMove++)->move;
if ( move != MOVE_NONE
- && move_is_legal(pos, move, pinned))
+ && pos.move_is_legal(move, pinned))
return move;
break;
case PH_KILLERS:
move = (curMove++)->move;
if ( move != MOVE_NONE
- && move_is_legal(pos, move, pinned)
+ && pos.move_is_legal(move, pinned)
&& move != ttMoves[0].move
&& move != ttMoves[1].move
&& !pos.move_is_capture(move))
go_next_phase();
}
}
-