// Time managment variables
int SearchStartTime, MaxNodes, MaxDepth, ExactMaxTime;
- bool UseTimeManagement, InfiniteSearch, PonderSearch, StopOnPonderhit;
- bool FirstRootMove, AbortSearch, Quit, AspirationFailLow;
+ bool UseTimeManagement, InfiniteSearch, Pondering, StopOnPonderhit;
+ bool FirstRootMove, StopRequest, QuitRequest, AspirationFailLow;
TimeManager TimeMgr;
// Log file
std::string value_to_uci(Value v);
int nps(const Position& pos);
void poll(const Position& pos);
- void ponderhit();
void wait_for_stop_or_ponderhit();
void init_ss_array(SearchStack* ss, int size);
int movesToGo, int maxDepth, int maxNodes, int maxTime, Move searchMoves[]) {
// Initialize global search variables
- StopOnPonderhit = AbortSearch = Quit = AspirationFailLow = SendSearchedNodes = false;
+ StopOnPonderhit = StopRequest = QuitRequest = AspirationFailLow = SendSearchedNodes = false;
NodesSincePoll = 0;
SearchStartTime = get_system_time();
ExactMaxTime = maxTime;
MaxDepth = maxDepth;
MaxNodes = maxNodes;
InfiniteSearch = infinite;
- PonderSearch = ponder;
+ Pondering = ponder;
UseTimeManagement = !ExactMaxTime && !MaxDepth && !MaxNodes && !InfiniteSearch;
// Look for a book move, only during games, not tests
Move bookMove = OpeningBook.get_move(pos, Options["Best Book Move"].value<bool>());
if (bookMove != MOVE_NONE)
{
- if (PonderSearch)
+ if (Pondering)
wait_for_stop_or_ponderhit();
cout << "bestmove " << bookMove << endl;
// If we are pondering or in infinite search, we shouldn't print the
// best move before we are told to do so.
- if (!AbortSearch && (PonderSearch || InfiniteSearch))
+ if (!StopRequest && (Pondering || InfiniteSearch))
wait_for_stop_or_ponderhit();
// Could be both MOVE_NONE when searching on a stalemate position
cout << "bestmove " << bestMove << " ponder " << ponderMove << endl;
- return !Quit;
+ return !QuitRequest;
}
// Search to the current depth, rml is updated and sorted
value = root_search(pos, ss, alpha, beta, depth, rml);
- if (AbortSearch)
+ if (StopRequest)
break; // Value cannot be trusted. Break out immediately!
//Save info about search result
if (stopSearch)
{
- if (PonderSearch)
+ if (Pondering)
StopOnPonderhit = true;
else
break;
rml.sort();
// Step 10. Loop through all moves in the root move list
- for (int i = 0; i < (int)rml.size() && !AbortSearch; i++)
+ for (int i = 0; i < (int)rml.size() && !StopRequest; i++)
{
// This is used by time management
FirstRootMove = (i == 0);
pos.undo_move(move);
// Can we exit fail high loop ?
- if (AbortSearch || value < beta)
+ if (StopRequest || value < beta)
break;
// We are failing high and going to do a research. It's important to update
// ran out of time. In this case, the return value of the search cannot
// be trusted, and we break out of the loop without updating the best
// move and/or PV.
- if (AbortSearch)
+ if (StopRequest)
break;
// Remember searched nodes counts for this move
} // Root moves loop
// Can we exit fail low loop ?
- if (AbortSearch || !AspirationFailLow)
+ if (StopRequest || !AspirationFailLow)
break;
// Prepare for a research after a fail low, each time with a wider window
}
// Step 2. Check for aborted search and immediate draw
- if ( AbortSearch
+ if ( StopRequest
|| ThreadsMgr.cutoff_at_splitpoint(threadID)
|| pos.is_draw()
|| ply >= PLY_MAX - 1)
&& ThreadsMgr.active_threads() > 1
&& bestValue < beta
&& ThreadsMgr.available_thread_exists(threadID)
- && !AbortSearch
+ && !StopRequest
&& !ThreadsMgr.cutoff_at_splitpoint(threadID)
&& Iteration <= 99)
ThreadsMgr.split<FakeSplit>(pos, ss, ply, &alpha, beta, &bestValue, depth,
// Step 20. Update tables
// If the search is not aborted, update the transposition table,
// history counters, and killer moves.
- if (!SpNode && !AbortSearch && !ThreadsMgr.cutoff_at_splitpoint(threadID))
+ if (!SpNode && !StopRequest && !ThreadsMgr.cutoff_at_splitpoint(threadID))
{
move = bestValue <= oldAlpha ? MOVE_NONE : ss->bestMove;
vt = bestValue <= oldAlpha ? VALUE_TYPE_UPPER
static int lastInfoTime;
int t = current_search_time();
+ bool stillAtFirstMove = FirstRootMove
+ && !AspirationFailLow
+ && t > TimeMgr.available_time();
+
+ bool noMoreTime = t > TimeMgr.maximum_time()
+ || stillAtFirstMove;
+
// Poll for input
if (data_available())
{
if (command == "quit")
{
- AbortSearch = true;
- PonderSearch = false;
- Quit = true;
+ // Quit the program as soon as possible
+ Pondering = false;
+ QuitRequest = StopRequest = true;
return;
}
else if (command == "stop")
{
- AbortSearch = true;
- PonderSearch = false;
+ // Stop calculating as soon as possible, but still send the "bestmove"
+ // and possibly the "ponder" token when finishing the search.
+ Pondering = false;
+ StopRequest = true;
}
else if (command == "ponderhit")
- ponderhit();
+ {
+ // The opponent has played the expected move. GUI sends "ponderhit" if
+ // we were told to ponder on the same move the opponent has played. We
+ // should continue searching but switching from pondering to normal search.
+ Pondering = false;
+
+ if ( Iteration >= 3 && UseTimeManagement
+ && (noMoreTime || StopOnPonderhit))
+ StopRequest = true;
+ }
}
// Print search information
}
// Should we stop the search?
- if (PonderSearch)
+ if (Pondering)
return;
- bool stillAtFirstMove = FirstRootMove
- && !AspirationFailLow
- && t > TimeMgr.available_time();
-
- bool noMoreTime = t > TimeMgr.maximum_time()
- || stillAtFirstMove;
-
if ( (Iteration >= 3 && UseTimeManagement && noMoreTime)
|| (ExactMaxTime && t >= ExactMaxTime)
|| (Iteration >= 3 && MaxNodes && pos.nodes_searched() >= MaxNodes))
- AbortSearch = true;
- }
-
-
- // ponderhit() is called when the program is pondering (i.e. thinking while
- // it's the opponent's turn to move) in order to let the engine know that
- // it correctly predicted the opponent's move.
-
- void ponderhit() {
-
- int t = current_search_time();
- PonderSearch = false;
-
- bool stillAtFirstMove = FirstRootMove
- && !AspirationFailLow
- && t > TimeMgr.available_time();
-
- bool noMoreTime = t > TimeMgr.maximum_time()
- || stillAtFirstMove;
-
- if (Iteration >= 3 && UseTimeManagement && (noMoreTime || StopOnPonderhit))
- AbortSearch = true;
+ StopRequest = true;
}
if (command == "quit")
{
- Quit = true;
+ QuitRequest = true;
break;
}
else if (command == "ponderhit" || command == "stop")
projects / stockfish / blobdiff