Move movesSearched[256];
EvalInfo ei;
StateInfo st;
- Bitboard dcCandidates;
const TTEntry* tte;
Move ttMove, move;
Depth ext, newDepth;
tte = TT.retrieve(pos.get_key());
ttMove = (tte ? tte->move() : MOVE_NONE);
- // Go with internal iterative deepening if we don't have a TT move or
- // if search depth is more then 4*OnePly higher then TT move depth.
- if ( UseIIDAtPVNodes
- && depth >= 5*OnePly
- &&(!ttMove || depth > tte->depth() + 4*OnePly))
+ // Go with internal iterative deepening if we don't have a TT move
+ if (UseIIDAtPVNodes && ttMove == MOVE_NONE && depth >= 5*OnePly)
{
search_pv(pos, ss, alpha, beta, depth-2*OnePly, ply, threadID);
ttMove = ss[ply].pv[ply];
// to search all moves
isCheck = pos.is_check();
mateThreat = pos.has_mate_threat(opposite_color(pos.side_to_move()));
- dcCandidates = pos.discovered_check_candidates(pos.side_to_move());
+ CheckInfo ci(pos);
MovePicker mp = MovePicker(pos, ttMove, depth, H, &ss[ply]);
// Loop through all legal moves until no moves remain or a beta cutoff
assert(move_is_ok(move));
singleReply = (isCheck && mp.number_of_evasions() == 1);
- moveIsCheck = pos.move_is_check(move, dcCandidates);
+ moveIsCheck = pos.move_is_check(move, ci);
captureOrPromotion = pos.move_is_capture_or_promotion(move);
movesSearched[moveCount++] = ss[ply].currentMove = move;
newDepth = depth - OnePly + ext;
// Make and search the move
- pos.do_move(move, st, dcCandidates);
+ pos.do_move(move, st, ci.dcCandidates);
if (moveCount == 1) // The first move in list is the PV
value = -search_pv(pos, ss, -beta, -alpha, newDepth, ply+1, threadID);
&& !AbortSearch
&& !thread_should_stop(threadID)
&& split(pos, ss, ply, &alpha, &beta, &bestValue, VALUE_NONE, VALUE_NONE, depth,
- &moveCount, &mp, dcCandidates, threadID, true))
+ &moveCount, &mp, ci.dcCandidates, threadID, true))
break;
}
Move movesSearched[256];
EvalInfo ei;
StateInfo st;
- Bitboard dcCandidates;
const TTEntry* tte;
Move ttMove, move;
Depth ext, newDepth;
// Initialize a MovePicker object for the current position, and prepare
// to search all moves.
MovePicker mp = MovePicker(pos, ttMove, depth, H, &ss[ply]);
- dcCandidates = pos.discovered_check_candidates(pos.side_to_move());
+ CheckInfo ci(pos);
futilityValue = VALUE_NONE;
useFutilityPruning = depth < SelectiveDepth && !isCheck;
assert(move_is_ok(move));
singleReply = (isCheck && mp.number_of_evasions() == 1);
- moveIsCheck = pos.move_is_check(move, dcCandidates);
+ moveIsCheck = pos.move_is_check(move, ci);
captureOrPromotion = pos.move_is_capture_or_promotion(move);
movesSearched[moveCount++] = ss[ply].currentMove = move;
}
// Make and search the move
- pos.do_move(move, st, dcCandidates);
+ pos.do_move(move, st, ci.dcCandidates);
// Try to reduce non-pv search depth by one ply if move seems not problematic,
// if the move fails high will be re-searched at full depth.
&& !AbortSearch
&& !thread_should_stop(threadID)
&& split(pos, ss, ply, &beta, &beta, &bestValue, futilityValue, approximateEval, depth, &moveCount,
- &mp, dcCandidates, threadID, false))
+ &mp, ci.dcCandidates, threadID, false))
break;
}
EvalInfo ei;
StateInfo st;
- Bitboard dcCandidates;
Move ttMove, move;
Value staticValue, bestValue, value, futilityValue;
bool isCheck, enoughMaterial;
// 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, H);
- dcCandidates = pos.discovered_check_candidates(pos.side_to_move());
+ CheckInfo ci(pos);
enoughMaterial = pos.non_pawn_material(pos.side_to_move()) > RookValueMidgame;
// Loop through the moves until no moves remain or a beta cutoff
&& !isCheck
&& !pvNode
&& !move_is_promotion(move)
- && !pos.move_is_check(move, dcCandidates)
+ && !pos.move_is_check(move, ci)
&& !pos.move_is_passed_pawn_push(move))
{
futilityValue = staticValue
continue;
// Make and search the move
- pos.do_move(move, st, dcCandidates);
+ pos.do_move(move, st, ci.dcCandidates);
value = -qsearch(pos, ss, -beta, -alpha, depth-OnePly, ply+1, threadID);
pos.undo_move(move);
assert(ActiveThreads > 1);
Position pos = Position(sp->pos);
+ CheckInfo ci(pos);
SearchStack* ss = sp->sstack[threadID];
Value value;
Move move;
{
assert(move_is_ok(move));
- bool moveIsCheck = pos.move_is_check(move, sp->dcCandidates);
+ bool moveIsCheck = pos.move_is_check(move, ci);
bool captureOrPromotion = pos.move_is_capture_or_promotion(move);
lock_grab(&(sp->lock));
assert(ActiveThreads > 1);
Position pos = Position(sp->pos);
+ CheckInfo ci(pos);
SearchStack* ss = sp->sstack[threadID];
Value value;
Move move;
&& !thread_should_stop(threadID)
&& (move = sp->mp->get_next_move(sp->lock)) != MOVE_NONE)
{
- bool moveIsCheck = pos.move_is_check(move, sp->dcCandidates);
+ bool moveIsCheck = pos.move_is_check(move, ci);
bool captureOrPromotion = pos.move_is_capture_or_promotion(move);
assert(move_is_ok(move));