namespace Search {
+struct PVEntry {
+ Move pv[MAX_PLY+1];
+
+ void update(Move move, PVEntry* child) {
+ pv[0] = move;
+
+ int i = 1;
+ for (; child && i < MAX_PLY && child->pv[i - 1] != MOVE_NONE; ++i)
+ pv[i] = child->pv[i - 1];
+ pv[i] = MOVE_NONE;
+ }
+};
+
/// The Stack struct keeps track of the information we need to remember from
/// nodes shallower and deeper in the tree during the search. Each search thread
/// has its own array of Stack objects, indexed by the current ply.
struct Stack {
SplitPoint* splitPoint;
+ PVEntry* pv;
int ply;
Move currentMove;
Move ttMove;
bool operator<(const RootMove& m) const { return score > m.score; } // Ascending sort
bool operator==(const Move& m) const { return pv[0] == m; }
- void extract_pv_from_tt(Position& pos);
void insert_pv_in_tt(Position& pos);
Value score;
extern Time::point SearchTime;
extern StateStackPtr SetupStates;
-extern void init();
-extern void think();
+void init();
+void think();
template<bool Root> uint64_t perft(Position& pos, Depth depth);
} // namespace Search