// RootMoveList struct is mainly a std::vector of RootMove objects
struct RootMoveList : public std::vector<RootMove> {
void init(Position& pos, Move searchMoves[]);
+ RootMove* find(const Move &m);
int bestMoveChanges;
};
MovePickerExt(const Position& p, Move ttm, Depth d, const History& h, SearchStack* ss, Value b)
: MovePicker(p, ttm, d, h, ss, b) {}
-
- RootMove& current() { assert(false); return Rml[0]; } // Dummy, needed to compile
};
// In case of a SpNode we use split point's shared MovePicker object as moves source
: MovePickerExt<SplitPointNonPV>(p, ttm, d, h, ss, b) {}
};
- // In case of a Root node we use RootMoveList as moves source
- template<> struct MovePickerExt<Root> : public MovePicker {
-
- MovePickerExt(const Position&, Move, Depth, const History&, SearchStack*, Value);
- RootMove& current() { return Rml[cur]; }
- Move get_next_move() { return ++cur < (int)Rml.size() ? Rml[cur].pv[0] : MOVE_NONE; }
-
- int cur;
- };
-
// Overload operator<<() to make it easier to print moves in a coordinate
// notation compatible with UCI protocol.
std::ostream& operator<<(std::ostream& os, Move m) {
// Search starting from ss+1 to allow calling update_gains()
value = search<Root>(pos, ss+1, alpha, beta, depth * ONE_PLY);
+ // It is critical that sorting is done with a stable algorithm
+ // because all the values but the first are usually set to
+ // -VALUE_INFINITE and we want to keep the same order for all
+ // the moves but the new PV that goes to head.
+ sort<RootMove>(Rml.begin(), Rml.end());
+
// Write PV back to transposition table in case the relevant entries
// have been overwritten during the search.
for (int i = 0; i < Min(MultiPV, (int)Rml.size()); i++)
split_point_start: // At split points actual search starts from here
// Initialize a MovePicker object for the current position
- MovePickerExt<NT> mp(pos, ttMove, depth, H, ss, PvNode ? -VALUE_INFINITE : beta);
+ MovePickerExt<NT> mp(pos, RootNode ? Rml[0].pv[0] : ttMove, depth, H, ss, PvNode ? -VALUE_INFINITE : beta);
CheckInfo ci(pos);
ss->bestMove = MOVE_NONE;
futilityBase = ss->eval + ss->evalMargin;
break;
// Remember searched nodes counts for this move
- mp.current().nodes += pos.nodes_searched() - nodes;
+ Rml.find(move)->nodes += pos.nodes_searched() - nodes;
// PV move or new best move ?
if (isPvMove || value > alpha)
{
// Update PV
- mp.current().pv_score = value;
- mp.current().extract_pv_from_tt(pos);
+ Rml.find(move)->pv_score = value;
+ Rml.find(move)->extract_pv_from_tt(pos);
// We record how often the best move has been changed in each
// iteration. This information is used for time management: When
if (!isPvMove && MultiPV == 1)
Rml.bestMoveChanges++;
- // It is critical that sorting is done with a stable algorithm
- // because all the values but the first are usually set to
- // -VALUE_INFINITE and we want to keep the same order for all
- // the moves but the new PV that goes to head.
- sort<RootMove>(Rml.begin(), Rml.begin() + moveCount);
-
- // Update alpha. In multi-pv we don't use aspiration window, so set
- // alpha equal to minimum score among the PV lines searched so far.
- if (MultiPV > 1)
- alpha = Rml[Min(moveCount, MultiPV) - 1].pv_score;
- else if (value > alpha)
+ // Update alpha.
+ if (value > alpha)
alpha = value;
}
else
// All other moves but the PV are set to the lowest value, this
// is not a problem when sorting becuase sort is stable and move
// position in the list is preserved, just the PV is pushed up.
- mp.current().pv_score = -VALUE_INFINITE;
+ Rml.find(move)->pv_score = -VALUE_INFINITE;
} // RootNode
}
}
+ RootMove* RootMoveList::find(const Move &m) {
+
+ for (int i = 0; i < int(size()); i++)
+ {
+ if ((*this)[i].pv[0] == m)
+ return &(*this)[i];
+ }
+
+ return NULL;
+ }
+
// extract_pv_from_tt() builds a PV by adding moves from the transposition table.
// We consider also failing high nodes and not only VALUE_TYPE_EXACT nodes. This
// allow to always have a ponder move even when we fail high at root and also a
do pos.undo_move(pv[--ply]); while (ply);
}
-
- // Specializations for MovePickerExt in case of Root node
- MovePickerExt<Root>::MovePickerExt(const Position& p, Move ttm, Depth d,
- const History& h, SearchStack* ss, Value b)
- : MovePicker(p, ttm, d, h, ss, b), cur(-1) {
- Move move;
- Value score = VALUE_ZERO;
-
- // Score root moves using standard ordering used in main search, the moves
- // are scored according to the order in which they are returned by MovePicker.
- // This is the second order score that is used to compare the moves when
- // the first orders pv_score of both moves are equal.
- while ((move = MovePicker::get_next_move()) != MOVE_NONE)
- for (RootMoveList::iterator rm = Rml.begin(); rm != Rml.end(); ++rm)
- if (rm->pv[0] == move)
- {
- rm->non_pv_score = score--;
- break;
- }
-
- sort<RootMove>(Rml.begin(), Rml.end());
- }
-
} // namespace
projects / stockfish / blobdiff