int NodesSincePoll;
int NodesBetweenPolls = 30000;
+ // History table
+ History H;
+
/// Functions
bool move_is_killer(Move m, const SearchStack& ss);
Depth extension(const Position& pos, Move m, bool pvNode, bool capture, bool check, bool singleReply, bool mateThreat, bool* dangerous);
bool ok_to_do_nullmove(const Position& pos);
- bool ok_to_prune(const Position& pos, Move m, Move threat, Depth d, const History& H);
+ bool ok_to_prune(const Position& pos, Move m, Move threat, Depth d);
bool ok_to_use_TT(const TTEntry* tte, Depth depth, Value beta, int ply);
bool ok_to_history(const Position& pos, Move m);
- void update_history(const Position& pos, Move m, Depth depth, History& H, Move movesSearched[], int moveCount);
+ void update_history(const Position& pos, Move m, Depth depth, Move movesSearched[], int moveCount);
void update_killers(Move m, SearchStack& ss);
bool fail_high_ply_1();
// Initialize
TT.new_search();
- for (int i = 0; i < THREAD_MAX; i++)
- Threads[i].H.clear();
-
+ H.clear();
for (int i = 0; i < 3; i++)
{
ss[i].init(i);
// Initialize a MovePicker object for the current position, and prepare
// to search all moves
- MovePicker mp = MovePicker(pos, ttMove, depth, Threads[threadID].H, &ss[ply]);
+ MovePicker mp = MovePicker(pos, ttMove, depth, H, &ss[ply]);
Move move, movesSearched[256];
int moveCount = 0;
Move m = ss[ply].pv[ply];
if (ok_to_history(pos, m)) // Only non capture moves are considered
{
- update_history(pos, m, depth, Threads[threadID].H, movesSearched, moveCount);
+ update_history(pos, m, depth, movesSearched, moveCount);
update_killers(m, ss[ply]);
}
TT.store(pos.get_key(), value_to_tt(bestValue, ply), VALUE_TYPE_LOWER, depth, m);
// Initialize a MovePicker object for the current position, and prepare
// to search all moves.
- MovePicker mp = MovePicker(pos, ttMove, depth, Threads[threadID].H, &ss[ply]);
+ MovePicker mp = MovePicker(pos, ttMove, depth, H, &ss[ply]);
Move move, movesSearched[256];
int moveCount = 0;
{
// History pruning. See ok_to_prune() definition
if ( moveCount >= 2 + int(depth)
- && ok_to_prune(pos, move, ss[ply].threatMove, depth, Threads[threadID].H))
+ && ok_to_prune(pos, move, ss[ply].threatMove, depth))
continue;
// Value based pruning
Move m = ss[ply].pv[ply];
if (ok_to_history(pos, m)) // Only non capture moves are considered
{
- update_history(pos, m, depth, Threads[threadID].H, movesSearched, moveCount);
+ update_history(pos, m, depth, movesSearched, moveCount);
update_killers(m, ss[ply]);
}
TT.store(pos.get_key(), value_to_tt(bestValue, ply), VALUE_TYPE_LOWER, depth, m);
// Initialize a MovePicker object for the current position, and prepare
// to search the moves. Because the depth is <= 0 here, only captures,
// queen promotions and checks (only if depth == 0) will be generated.
- MovePicker mp = MovePicker(pos, ttMove, depth, Threads[threadID].H);
+ MovePicker mp = MovePicker(pos, ttMove, depth, H);
Move move;
int moveCount = 0;
Bitboard dcCandidates = mp.discovered_check_candidates();
&& !moveIsCapture
&& !move_is_promotion(move)
&& moveCount >= 2 + int(sp->depth)
- && ok_to_prune(pos, move, ss[sp->ply].threatMove, sp->depth, Threads[threadID].H))
+ && ok_to_prune(pos, move, ss[sp->ply].threatMove, sp->depth))
continue;
// Make and search the move.
// non-tactical moves late in the move list close to the leaves are
// candidates for pruning.
- bool ok_to_prune(const Position& pos, Move m, Move threat, Depth d, const History& H) {
+ bool ok_to_prune(const Position& pos, Move m, Move threat, Depth d) {
assert(move_is_ok(m));
assert(threat == MOVE_NONE || move_is_ok(threat));
- assert(!move_promotion(m));
+ assert(!move_is_promotion(m));
assert(!pos.move_is_check(m));
assert(!pos.move_is_capture(m));
assert(!pos.move_is_passed_pawn_push(m));
// update_history() registers a good move that produced a beta-cutoff
// in history and marks as failures all the other moves of that ply.
- void update_history(const Position& pos, Move m, Depth depth, History& H,
+ void update_history(const Position& pos, Move m, Depth depth,
Move movesSearched[], int moveCount) {
H.success(pos.piece_on(move_from(m)), move_to(m), depth);