X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fmovepick.cpp;h=280a61a1117bea419091c05223e1a053d6efc5cd;hp=b115e8ffb1a9c3b9a6a1c6371ffef62067eea3e3;hb=de050db2b096d92f73f1e23a4dcb3bfef4c098f6;hpb=fcc49561a139c6e0ddfbd9fc4942ce415a7963c9 diff --git a/src/movepick.cpp b/src/movepick.cpp index b115e8ff..280a61a1 100644 --- a/src/movepick.cpp +++ b/src/movepick.cpp @@ -8,6 +8,7 @@ the Free Software Foundation, either version 3 of the License, or (at your option) any later version. + Stockfish is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the @@ -25,6 +26,7 @@ #include #include "history.h" +#include "evaluate.h" #include "movegen.h" #include "movepick.h" #include "search.h" @@ -48,7 +50,6 @@ namespace { } - //// //// Functions //// @@ -61,29 +62,31 @@ namespace { /// search captures, promotions and some checks) and about how important good /// move ordering is at the current node. -MovePicker::MovePicker(const Position& p, bool pvnode, Move ttm, Move mk, - Move k1, Move k2, Depth d) : pos(p) { - pvNode = pvnode; +MovePicker::MovePicker(const Position& p, bool pv, Move ttm, + const SearchStack& ss, Depth d) : pos(p) { + pvNode = pv; ttMove = ttm; - mateKiller = (mk == ttm)? MOVE_NONE : mk; - killer1 = k1; - killer2 = k2; + mateKiller = (ss.mateKiller == ttm)? MOVE_NONE : ss.mateKiller; + killer1 = ss.killers[0]; + killer2 = ss.killers[1]; depth = d; movesPicked = 0; numOfMoves = 0; numOfBadCaptures = 0; - dc = p.discovered_check_candidates(p.side_to_move()); if (p.is_check()) - phaseIndex = EvasionsPhaseIndex; + phaseIndex = EvasionsPhaseIndex; else if (depth > Depth(0)) - phaseIndex = MainSearchPhaseIndex; + phaseIndex = MainSearchPhaseIndex; else if (depth == Depth(0)) - phaseIndex = QsearchWithChecksPhaseIndex; + phaseIndex = QsearchWithChecksPhaseIndex; else - phaseIndex = QsearchWithoutChecksPhaseIndex; + phaseIndex = QsearchWithoutChecksPhaseIndex; + + Color us = pos.side_to_move(); - pinned = p.pinned_pieces(p.side_to_move()); + dc = p.discovered_check_candidates(us); + pinned = p.pinned_pieces(us); finished = false; } @@ -127,8 +130,8 @@ Move MovePicker::get_next_move() { assert(move_is_ok(mateKiller)); if (move_is_legal(pos, mateKiller, pinned)) return mateKiller; - } - break; + } + break; case PH_GOOD_CAPTURES: numOfMoves = generate_captures(pos, moves); @@ -137,7 +140,7 @@ Move MovePicker::get_next_move() { break; case PH_BAD_CAPTURES: - badCapturesPicked = 0; + movesPicked = 0; break; case PH_NONCAPTURES: @@ -148,7 +151,7 @@ Move MovePicker::get_next_move() { case PH_EVASIONS: assert(pos.is_check()); - numOfMoves = generate_evasions(pos, moves); + numOfMoves = generate_evasions(pos, moves, pinned); score_evasions(); movesPicked = 0; break; @@ -210,6 +213,8 @@ void MovePicker::score_captures() { // where it is possible to recapture with the hanging piece). Exchanging // big pieces before capturing a hanging piece probably helps to reduce // the subtree size. + // While scoring captures it moves all captures with negative SEE values + // to the badCaptures[] array. Move m; int seeValue; @@ -224,8 +229,15 @@ void MovePicker::score_captures() { else moves[i].score = int(pos.midgame_value_of_piece_on(move_to(m))) -int(pos.type_of_piece_on(move_from(m))); - } else + } + else + { + // Losing capture, move it to the badCaptures[] array + assert(numOfBadCaptures < 63); moves[i].score = seeValue; + badCaptures[numOfBadCaptures++] = moves[i]; + moves[i--] = moves[--numOfMoves]; + } } } @@ -233,25 +245,26 @@ 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. - Move m; - int hs; - - for (int i = 0; i < numOfMoves; i++) - { - m = moves[i].move; - - if (m == killer1) - hs = HistoryMax + 2; - else if (m == killer2) - hs = HistoryMax + 1; - else - hs = H.move_ordering_score(pos.piece_on(move_from(m)), m); - - // Ensure moves in history are always sorted as first - if (hs > 0) - hs += 1000; - - moves[i].score = hs + pos.mg_pst_delta(m); + Move m; + int hs; + + for (int i = 0; i < numOfMoves; i++) + { + m = moves[i].move; + + if (m == killer1) + hs = HistoryMax + 2; + else if (m == killer2) + hs = HistoryMax + 1; + else + hs = H.move_ordering_score(pos.piece_on(move_from(m)), m); + + // Ensure history is always preferred to pst + if (hs > 0) + hs += 1000; + + // pst based scoring + moves[i].score = hs + pos.mg_pst_delta(m); } } @@ -269,7 +282,6 @@ void MovePicker::score_evasions() { } else moves[i].score = H.move_ordering_score(pos.piece_on(move_from(m)), m); } - // FIXME try psqt also here } void MovePicker::score_qcaptures() { @@ -290,11 +302,14 @@ void MovePicker::score_qcaptures() { /// find_best_index() loops across the moves and returns index of /// the highest scored one. -int MovePicker::find_best_index() { +int MovePicker::find_best_index() const { + + assert(movesPicked < numOfMoves); - int bestScore = -10000000, bestIndex = -1; + int bestIndex = movesPicked; + int bestScore = moves[movesPicked].score; - for (int i = movesPicked; i < numOfMoves; i++) + for (int i = movesPicked + 1; i < numOfMoves; i++) if (moves[i].score > bestScore) { bestIndex = i; @@ -308,9 +323,6 @@ int MovePicker::find_best_index() { /// from a list of generated moves (moves[] or badCaptures[], depending on /// the current move generation phase). It takes care not to return the /// transposition table move if that has already been serched previously. -/// While picking captures in the PH_GOOD_CAPTURES phase (i.e. while picking -/// non-losing captures in the main search), it moves all captures with -/// negative SEE values to the badCaptures[] array. Move MovePicker::pick_move_from_list() { @@ -318,38 +330,20 @@ Move MovePicker::pick_move_from_list() { Move move; switch (PhaseTable[phaseIndex]) { + case PH_GOOD_CAPTURES: assert(!pos.is_check()); assert(movesPicked >= 0); while (movesPicked < numOfMoves) { - int bestScore = -10000000; - bestIndex = -1; - for (int i = movesPicked; i < numOfMoves; i++) - { - if (moves[i].score < 0) - { - // Losing capture, move it to the badCaptures[] array - assert(numOfBadCaptures < 63); - badCaptures[numOfBadCaptures++] = moves[i]; - moves[i--] = moves[--numOfMoves]; - } - else if (moves[i].score > bestScore) - { - bestIndex = i; - bestScore = moves[i].score; - } - } - if (bestIndex != -1) // Found a good capture - { - move = moves[bestIndex].move; - moves[bestIndex] = moves[movesPicked++]; - if ( move != ttMove - && move != mateKiller - && pos.pl_move_is_legal(move, pinned)) - return move; - } + bestIndex = find_best_index(); + move = moves[bestIndex].move; + moves[bestIndex] = moves[movesPicked++]; + if ( move != ttMove + && move != mateKiller + && pos.pl_move_is_legal(move, pinned)) + return move; } break; @@ -364,16 +358,12 @@ Move MovePicker::pick_move_from_list() { // been searched and it is not a PV node, we are probably failing low // anyway, so we just pick the first move from the list. bestIndex = (pvNode || movesPicked < 12) ? find_best_index() : movesPicked; - - if (bestIndex != -1) - { - move = moves[bestIndex].move; - moves[bestIndex] = moves[movesPicked++]; - if ( move != ttMove - && move != mateKiller - && pos.pl_move_is_legal(move, pinned)) - return move; - } + move = moves[bestIndex].move; + moves[bestIndex] = moves[movesPicked++]; + if ( move != ttMove + && move != mateKiller + && pos.pl_move_is_legal(move, pinned)) + return move; } break; @@ -384,24 +374,20 @@ Move MovePicker::pick_move_from_list() { while (movesPicked < numOfMoves) { bestIndex = find_best_index(); - - if (bestIndex != -1) - { - move = moves[bestIndex].move; - moves[bestIndex] = moves[movesPicked++]; - return move; - } + move = moves[bestIndex].move; + moves[bestIndex] = moves[movesPicked++]; + return move; } break; case PH_BAD_CAPTURES: assert(!pos.is_check()); - assert(badCapturesPicked >= 0); + assert(movesPicked >= 0); // It's probably a good idea to use SEE move ordering here, instead // of just picking the first move. FIXME - while (badCapturesPicked < numOfBadCaptures) + while (movesPicked < numOfBadCaptures) { - move = badCaptures[badCapturesPicked++].move; + move = badCaptures[movesPicked++].move; if ( move != ttMove && move != mateKiller && pos.pl_move_is_legal(move, pinned)) @@ -415,16 +401,12 @@ Move MovePicker::pick_move_from_list() { while (movesPicked < numOfMoves) { bestIndex = (movesPicked < 4 ? find_best_index() : movesPicked); - - if (bestIndex != -1) - { - move = moves[bestIndex].move; - moves[bestIndex] = moves[movesPicked++]; - // Remember to change the line below if we decide to hash the qsearch! - // Maybe also postpone the legality check until after futility pruning? - if (/* move != ttMove && */ pos.pl_move_is_legal(move, pinned)) - return move; - } + move = moves[bestIndex].move; + moves[bestIndex] = moves[movesPicked++]; + // Maybe postpone the legality check until after futility pruning? + if ( move != ttMove + && pos.pl_move_is_legal(move, pinned)) + return move; } break; @@ -436,8 +418,8 @@ Move MovePicker::pick_move_from_list() { while (movesPicked < numOfMoves) { move = moves[movesPicked++].move; - // Remember to change the line below if we decide to hash the qsearch! - if (/* move != ttMove && */ pos.pl_move_is_legal(move, pinned)) + if ( move != ttMove + && pos.pl_move_is_legal(move, pinned)) return move; } break; @@ -449,19 +431,10 @@ Move MovePicker::pick_move_from_list() { } -/// MovePicker::current_move_type() returns the type of the just -/// picked next move. It can be used in search to further differentiate -/// according to the current move type: capture, non capture, escape, etc. -MovePicker::MovegenPhase MovePicker::current_move_type() const { - - return PhaseTable[phaseIndex]; -} - - /// MovePicker::init_phase_table() initializes the PhaseTable[], /// MainSearchPhaseIndex, EvasionPhaseIndex, QsearchWithChecksPhaseIndex -/// and QsearchWithoutChecksPhaseIndex variables. It is only called once -/// during program startup, and never again while the program is running. +/// and QsearchWithoutChecksPhaseIndex. It is only called once during +/// program startup, and never again while the program is running. void MovePicker::init_phase_table() { @@ -486,12 +459,14 @@ void MovePicker::init_phase_table() { // Quiescence search with checks QsearchWithChecksPhaseIndex = i - 1; + PhaseTable[i++] = PH_TT_MOVE; PhaseTable[i++] = PH_QCAPTURES; PhaseTable[i++] = PH_QCHECKS; PhaseTable[i++] = PH_STOP; // Quiescence search without checks QsearchWithoutChecksPhaseIndex = i - 1; + PhaseTable[i++] = PH_TT_MOVE; PhaseTable[i++] = PH_QCAPTURES; PhaseTable[i++] = PH_STOP; }