/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
+ Copyright (C) 2008-2013 Marco Costalba, Joona Kiiski, Tord Romstad
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
STOP
};
+ // Our insertion sort, guaranteed to be stable, as is needed
+ void insertion_sort(ExtMove* begin, ExtMove* end)
+ {
+ ExtMove tmp, *p, *q;
+
+ for (p = begin + 1; p < end; ++p)
+ {
+ tmp = *p;
+ for (q = p; q != begin && *(q-1) < tmp; --q)
+ *q = *(q-1);
+ *q = tmp;
+ }
+ }
+
// 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& ms) { return ms.score > 0; }
+ inline bool has_positive_score(const ExtMove& ms) { return ms.score > 0; }
// Picks and moves to the front the best move in the range [begin, end),
// 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* begin, MoveStack* end)
+ inline ExtMove* pick_best(ExtMove* begin, ExtMove* end)
{
std::swap(*begin, *std::max_element(begin, end));
return begin;
/// 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,
- Search::Stack* s, Value beta) : pos(p), Hist(h), depth(d) {
+MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const HistoryStats& h, Move* cm,
+ Search::Stack* s, Value beta) : pos(p), history(h), depth(d) {
assert(d > DEPTH_ZERO);
captureThreshold = 0;
cur = end = moves;
endBadCaptures = moves + MAX_MOVES - 1;
+ countermoves = cm;
ss = s;
if (p.checkers())
{
phase = MAIN_SEARCH;
- 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
- if (ss && ss->staticEval < beta - PawnValueMg && d < 3 * ONE_PLY)
+ if (ss->staticEval < beta - PawnValueMg && d < 3 * ONE_PLY)
captureThreshold = -PawnValueMg;
// Consider negative captures as good if still enough to reach beta
- else if (ss && ss->staticEval > beta)
+ else if (ss->staticEval > beta)
captureThreshold = beta - ss->staticEval;
}
end += (ttMove != MOVE_NONE);
}
-MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const History& h,
- Square sq) : pos(p), Hist(h), cur(moves), end(moves) {
+MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const HistoryStats& h,
+ Square sq) : pos(p), history(h), cur(moves), end(moves) {
assert(d <= DEPTH_ZERO);
end += (ttMove != MOVE_NONE);
}
-MovePicker::MovePicker(const Position& p, Move ttm, const History& h, PieceType pt)
- : pos(p), Hist(h), cur(moves), end(moves) {
+MovePicker::MovePicker(const Position& p, Move ttm, const HistoryStats& h, PieceType pt)
+ : pos(p), history(h), cur(moves), end(moves) {
assert(!pos.checkers());
// some SEE calls in case we get a cutoff (idea from Pablo Vazquez).
Move m;
- for (MoveStack* it = moves; it != end; ++it)
+ for (ExtMove* it = moves; it != end; ++it)
{
m = it->move;
it->score = PieceValue[MG][pos.piece_on(to_sq(m))]
Move m;
- for (MoveStack* it = moves; it != end; ++it)
+ for (ExtMove* it = moves; it != end; ++it)
{
m = it->move;
- it->score = Hist[pos.piece_moved(m)][to_sq(m)];
+ it->score = history[pos.piece_moved(m)][to_sq(m)];
}
}
Move m;
int seeScore;
- for (MoveStack* it = moves; it != end; ++it)
+ for (ExtMove* it = moves; it != end; ++it)
{
m = it->move;
if ((seeScore = pos.see_sign(m)) < 0)
- it->score = seeScore - History::Max; // At the bottom
+ it->score = seeScore - HistoryStats::Max; // At the bottom
else if (pos.is_capture(m))
it->score = PieceValue[MG][pos.piece_on(to_sq(m))]
- - type_of(pos.piece_moved(m)) + History::Max;
+ - type_of(pos.piece_moved(m)) + HistoryStats::Max;
else
- it->score = Hist[pos.piece_moved(m)][to_sq(m)];
+ it->score = history[pos.piece_moved(m)][to_sq(m)];
}
}
case KILLERS_S1:
cur = killers;
end = cur + 2;
+
+ killers[0].move = ss->killers[0];
+ killers[1].move = ss->killers[1];
+ killers[2].move = killers[3].move = MOVE_NONE;
+
+ // Be sure countermoves are different from killers
+ for (int i = 0; i < 2; i++)
+ if (countermoves[i] != cur->move && countermoves[i] != (cur+1)->move)
+ (end++)->move = countermoves[i];
+
+ if (countermoves[1] && countermoves[1] == countermoves[0]) // Due to SMP races
+ killers[3].move = MOVE_NONE;
+
return;
case QUIETS_1_S1:
endQuiets = end = generate<QUIETS>(pos, moves);
score<QUIETS>();
end = std::partition(cur, end, has_positive_score);
- sort<MoveStack>(cur, end);
+ insertion_sort(cur, end);
return;
case QUIETS_2_S1:
cur = end;
end = endQuiets;
if (depth >= 3 * ONE_PLY)
- sort<MoveStack>(cur, end);
+ insertion_sort(cur, end);
return;
case BAD_CAPTURES_S1:
move = (cur++)->move;
if ( move != ttMove
&& move != killers[0].move
- && move != killers[1].move)
+ && move != killers[1].move
+ && move != killers[2].move
+ && move != killers[3].move)
return move;
break;
/// from the split point's shared MovePicker object. This function is not thread
/// safe so must be lock protected by the caller.
template<>
-Move MovePicker::next_move<true>() { return ss->sp->mp->next_move<false>(); }
+Move MovePicker::next_move<true>() { return ss->splitPoint->movePicker->next_move<false>(); }
projects / stockfish / blobdiff