////
#include <cassert>
-#include <cstdio>
#include <fstream>
#include <iostream>
#include <sstream>
// Time managment variables
int SearchStartTime;
int MaxNodes, MaxDepth;
- int MaxSearchTime, AbsoluteMaxSearchTime, ExtraSearchTime;
+ int MaxSearchTime, AbsoluteMaxSearchTime, ExtraSearchTime, TimeAdvantage;
Move BestRootMove, PonderMove, EasyMove;
int RootMoveNumber;
bool InfiniteSearch;
/// the program receives the UCI 'go' command. It initializes various
/// search-related global variables, and calls root_search()
-void think(const Position &pos, bool infinite, bool ponder, int time,
- int increment, int movesToGo, int maxDepth, int maxNodes,
- int maxTime, Move searchMoves[]) {
+void think(const Position &pos, bool infinite, bool ponder, int side_to_move,
+ int time[], int increment[], int movesToGo, int maxDepth,
+ int maxNodes, int maxTime, Move searchMoves[]) {
// Look for a book move:
if(!infinite && !ponder && get_option_value_bool("OwnBook")) {
TT.set_size(get_option_value_int("Hash"));
if(button_was_pressed("Clear Hash"))
TT.clear();
- PonderingEnabled = get_option_value_int("Ponder");
+ PonderingEnabled = get_option_value_bool("Ponder");
MultiPV = get_option_value_int("MultiPV");
CheckExtension[1] = Depth(get_option_value_int("Check Extension (PV nodes)"));
init_eval(ActiveThreads);
}
- // Write information to search log file:
- if(UseLogFile) {
- LogFile << "Searching: " << pos.to_fen() << '\n';
- LogFile << "infinite: " << infinite << " ponder: " << ponder
- << " time: " << time << " increment: " << increment
- << " moves to go: " << movesToGo << '\n';
- }
-
// Wake up sleeping threads:
wake_sleeping_threads();
assert(thread_is_available(i, 0));
// Set thinking time:
+ int myTime = time[side_to_move];
+ int myIncrement = increment[side_to_move];
+ int oppTime = time[1 - side_to_move];
+
+ TimeAdvantage = myTime - oppTime;
+
if(!movesToGo) { // Sudden death time control
if(increment) {
- MaxSearchTime = time / 30 + increment;
- AbsoluteMaxSearchTime = Max(time / 4, increment - 100);
+ MaxSearchTime = myTime / 30 + myIncrement;
+ AbsoluteMaxSearchTime = Max(myTime / 4, myIncrement - 100);
}
else { // Blitz game without increment
- MaxSearchTime = time / 40;
- AbsoluteMaxSearchTime = time / 8;
+ MaxSearchTime = myTime / 40;
+ AbsoluteMaxSearchTime = myTime / 8;
}
}
else { // (x moves) / (y minutes)
if(movesToGo == 1) {
- MaxSearchTime = time / 2;
- AbsoluteMaxSearchTime = Min(time / 2, time - 500);
+ MaxSearchTime = myTime / 2;
+ AbsoluteMaxSearchTime = Min(myTime / 2, myTime - 500);
}
else {
- MaxSearchTime = time / Min(movesToGo, 20);
- AbsoluteMaxSearchTime = Min((4 * time) / movesToGo, time / 3);
+ MaxSearchTime = myTime / Min(movesToGo, 20);
+ AbsoluteMaxSearchTime = Min((4 * myTime) / movesToGo, myTime / 3);
}
}
if(PonderingEnabled) {
else
NodesBetweenPolls = 30000;
+
+ // Write information to search log file:
+ if(UseLogFile) {
+ LogFile << "Searching: " << pos.to_fen() << '\n';
+ LogFile << "infinite: " << infinite << " ponder: " << ponder
+ << " time: " << myTime << " increment: " << myIncrement
+ << " moves to go: " << movesToGo << '\n';
+ }
+
// We're ready to start thinking. Call the iterative deepening loop
// function:
id_loop(pos, searchMoves);
BestMoveChangesByIteration[Iteration] * (MaxSearchTime / 2) +
BestMoveChangesByIteration[Iteration-1] * (MaxSearchTime / 3);
+ // If we need some more and we are in time advantage take it.
+ if (ExtraSearchTime > 0 && TimeAdvantage > 2 * MaxSearchTime)
+ ExtraSearchTime += MaxSearchTime / 2;
+
// Stop search if most of MaxSearchTime is consumed at the end of the
// iteration. We probably don't have enough time to search the first
// move at the next iteration anyway.
}
}
// Null move search not allowed, try razoring
- else if ( depth < RazorDepth
- && approximateEval < beta - RazorMargin
- && evaluate(pos, ei, threadID) < beta - RazorMargin)
+ else if (depth < RazorDepth && approximateEval < beta - RazorMargin)
{
Value v = qsearch(pos, ss, beta-1, beta, Depth(0), ply, threadID);
if (v < beta)
// If this is the master thread and we have been asked to stop because of
// a beta cutoff higher up in the tree, stop all slave threads:
if (sp->master == threadID && thread_should_stop(threadID))
- for(int i = 0; i < ActiveThreads; i++)
- if(sp->slaves[i])
+ for (int i = 0; i < ActiveThreads; i++)
+ if (sp->slaves[i])
Threads[i].stop = true;
sp->cpus--;
// after we return from the split point.
void sp_search_pv(SplitPoint *sp, int threadID) {
+
assert(threadID >= 0 && threadID < ActiveThreads);
assert(ActiveThreads > 1);
SearchStack *ss = sp->sstack[threadID];
Value value;
Move move;
- int moveCount = sp->moves;
- while(sp->alpha < sp->beta && !thread_should_stop(threadID)
- && (move = sp->mp->get_next_move(sp->lock)) != MOVE_NONE) {
- UndoInfo u;
- Depth ext, newDepth;
+ while ( sp->alpha < sp->beta
+ && !thread_should_stop(threadID)
+ && (move = sp->mp->get_next_move(sp->lock)) != MOVE_NONE)
+ {
bool moveIsCheck = pos.move_is_check(move, sp->dcCandidates);
bool moveIsCapture = pos.move_is_capture(move);
bool moveIsPassedPawnPush = pos.move_is_passed_pawn_push(move);
PawnValueMidgame : pos.midgame_value_of_piece_on(move_to(move));
lock_grab(&(sp->lock));
- sp->moves++;
- moveCount = sp->moves;
+ int moveCount = ++sp->moves;
lock_release(&(sp->lock));
ss[sp->ply].currentMove = move;
// Decide the new search depth.
- ext = extension(pos, move, true, moveIsCheck, false, false);
- newDepth = sp->depth - OnePly + ext;
+ Depth ext = extension(pos, move, true, moveIsCheck, false, false);
+ Depth newDepth = sp->depth - OnePly + ext;
// Make and search the move.
+ UndoInfo u;
pos.do_move(move, u, sp->dcCandidates);
- if(ext == Depth(0) && moveCount >= LMRPVMoves && !moveIsCapture
- && !move_promotion(move) && !moveIsPassedPawnPush
- && !move_is_castle(move)
- && move != ss[sp->ply].killer1 && move != ss[sp->ply].killer2) {
- ss[sp->ply].reduction = OnePly;
- value = -search(pos, ss, -sp->alpha, newDepth - OnePly, sp->ply+1,
- true, threadID);
+
+ // 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.
+ if ( ext == Depth(0)
+ && moveCount >= LMRPVMoves
+ && !moveIsCapture
+ && !moveIsPassedPawnPush
+ && !move_promotion(move)
+ && !move_is_castle(move)
+ && move != ss[sp->ply].killer1
+ && move != ss[sp->ply].killer2)
+ {
+ ss[sp->ply].reduction = OnePly;
+ value = -search(pos, ss, -sp->alpha, newDepth - OnePly, sp->ply+1, true, threadID);
}
else
- value = sp->alpha + 1;
- if(value > sp->alpha) {
- ss[sp->ply].reduction = Depth(0);
- value = -search(pos, ss, -sp->alpha, newDepth, sp->ply+1, true,
- threadID);
- if(value > sp->alpha && value < sp->beta) {
- if(sp->ply == 1 && RootMoveNumber == 1)
- // When the search fails high at ply 1 while searching the first
- // move at the root, set the flag failHighPly1. This is used for
- // time managment: We don't want to stop the search early in
- // such cases, because resolving the fail high at ply 1 could
- // result in a big drop in score at the root.
- Threads[threadID].failHighPly1 = true;
- value = -search_pv(pos, ss, -sp->beta, -sp->alpha, newDepth,
- sp->ply+1, threadID);
- Threads[threadID].failHighPly1 = false;
+ value = sp->alpha + 1; // Just to trigger next condition
+
+ if (value > sp->alpha) // Go with full depth non-pv search
+ {
+ ss[sp->ply].reduction = Depth(0);
+ value = -search(pos, ss, -sp->alpha, newDepth, sp->ply+1, true, threadID);
+
+ if (value > sp->alpha && value < sp->beta)
+ {
+ // When the search fails high at ply 1 while searching the first
+ // move at the root, set the flag failHighPly1. This is used for
+ // time managment: We don't want to stop the search early in
+ // such cases, because resolving the fail high at ply 1 could
+ // result in a big drop in score at the root.
+ if (sp->ply == 1 && RootMoveNumber == 1)
+ Threads[threadID].failHighPly1 = true;
+
+ value = -search_pv(pos, ss, -sp->beta, -sp->alpha, newDepth, sp->ply+1, threadID);
+ Threads[threadID].failHighPly1 = false;
}
}
pos.undo_move(move, u);
assert(value > -VALUE_INFINITE && value < VALUE_INFINITE);
- if(thread_should_stop(threadID))
- break;
+ if (thread_should_stop(threadID))
+ break;
// New best move?
lock_grab(&(sp->lock));
- if(value > sp->bestValue && !thread_should_stop(threadID)) {
- sp->bestValue = value;
- if(value > sp->alpha) {
- sp->alpha = value;
- sp_update_pv(sp->parentSstack, ss, sp->ply);
- if(value == value_mate_in(sp->ply + 1))
- ss[sp->ply].mateKiller = move;
- if(value >= sp->beta) {
- for(int i = 0; i < ActiveThreads; i++)
- if(i != threadID && (i == sp->master || sp->slaves[i]))
- Threads[i].stop = true;
- sp->finished = true;
- }
+ if (value > sp->bestValue && !thread_should_stop(threadID))
+ {
+ sp->bestValue = value;
+ if (value > sp->alpha)
+ {
+ sp->alpha = value;
+ sp_update_pv(sp->parentSstack, ss, sp->ply);
+ if (value == value_mate_in(sp->ply + 1))
+ ss[sp->ply].mateKiller = move;
+
+ if(value >= sp->beta)
+ {
+ for(int i = 0; i < ActiveThreads; i++)
+ if(i != threadID && (i == sp->master || sp->slaves[i]))
+ Threads[i].stop = true;
+
+ sp->finished = true;
+ }
}
// If we are at ply 1, and we are searching the first root move at
// ply 0, set the 'Problem' variable if the score has dropped a lot
// (from the computer's point of view) since the previous iteration:
- if(Iteration >= 2 &&
- -value <= ValueByIteration[Iteration-1] - ProblemMargin)
- Problem = true;
+ if (Iteration >= 2 && -value <= ValueByIteration[Iteration-1] - ProblemMargin)
+ Problem = true;
}
lock_release(&(sp->lock));
}
// If this is the master thread and we have been asked to stop because of
// a beta cutoff higher up in the tree, stop all slave threads:
- if(sp->master == threadID && thread_should_stop(threadID))
- for(int i = 0; i < ActiveThreads; i++)
- if(sp->slaves[i])
- Threads[i].stop = true;
+ if (sp->master == threadID && thread_should_stop(threadID))
+ for (int i = 0; i < ActiveThreads; i++)
+ if (sp->slaves[i])
+ Threads[i].stop = true;
sp->cpus--;
sp->slaves[threadID] = 0;
// search.
void poll() {
- int t, data;
- static int lastInfoTime;
- t = current_search_time();
+ static int lastInfoTime;
+ int t = current_search_time();
// Poll for input
- data = Bioskey();
- if(data) {
- char input[256];
- if(fgets(input, 255, stdin) == NULL)
- strcpy(input, "quit\n");
- if(strncmp(input, "quit", 4) == 0) {
- AbortSearch = true;
- PonderSearch = false;
- Quit = true;
- }
- else if(strncmp(input, "stop", 4) == 0) {
- AbortSearch = true;
- PonderSearch = false;
- }
- else if(strncmp(input, "ponderhit", 9) == 0)
- ponderhit();
- }
+ if (Bioskey())
+ {
+ // We are line oriented, don't read single chars
+ std::string command;
+ if (!std::getline(std::cin, command))
+ command = "quit";
- // Print search information
- if(t < 1000)
- lastInfoTime = 0;
- else if(lastInfoTime > t)
- // HACK: Must be a new search where we searched less than
- // NodesBetweenPolls nodes during the first second of search.
- lastInfoTime = 0;
- else if(t - lastInfoTime >= 1000) {
- lastInfoTime = t;
- lock_grab(&IOLock);
- std::cout << "info nodes " << nodes_searched() << " nps " << nps()
- << " time " << t << " hashfull " << TT.full() << std::endl;
- lock_release(&IOLock);
- if(ShowCurrentLine)
- Threads[0].printCurrentLine = true;
+ if (command == "quit")
+ {
+ AbortSearch = true;
+ PonderSearch = false;
+ Quit = true;
+ }
+ else if(command == "stop")
+ {
+ AbortSearch = true;
+ PonderSearch = false;
+ }
+ else if(command == "ponderhit")
+ ponderhit();
}
+ // Print search information
+ if (t < 1000)
+ lastInfoTime = 0;
+
+ else if (lastInfoTime > t)
+ // HACK: Must be a new search where we searched less than
+ // NodesBetweenPolls nodes during the first second of search.
+ lastInfoTime = 0;
+ else if (t - lastInfoTime >= 1000)
+ {
+ lastInfoTime = t;
+ lock_grab(&IOLock);
+ std::cout << "info nodes " << nodes_searched() << " nps " << nps()
+ << " time " << t << " hashfull " << TT.full() << std::endl;
+ lock_release(&IOLock);
+ if (ShowCurrentLine)
+ Threads[0].printCurrentLine = true;
+ }
// Should we stop the search?
- if(!PonderSearch && Iteration >= 2 &&
- (!InfiniteSearch && (t > AbsoluteMaxSearchTime ||
- (RootMoveNumber == 1 &&
- t > MaxSearchTime + ExtraSearchTime) ||
- (!FailHigh && !fail_high_ply_1() && !Problem &&
- t > 6*(MaxSearchTime + ExtraSearchTime)))))
- AbortSearch = true;
+ if (PonderSearch)
+ return;
- if(!PonderSearch && ExactMaxTime && t >= ExactMaxTime)
- AbortSearch = true;
+ bool overTime = t > AbsoluteMaxSearchTime
+ || (RootMoveNumber == 1 && t > MaxSearchTime + ExtraSearchTime)
+ || ( !FailHigh && !fail_high_ply_1() && !Problem
+ && t > 6*(MaxSearchTime + ExtraSearchTime));
- if(!PonderSearch && Iteration >= 3 && MaxNodes
- && nodes_searched() >= MaxNodes)
- AbortSearch = true;
+ if ( (Iteration >= 2 && (!InfiniteSearch && overTime))
+ || (ExactMaxTime && t >= ExactMaxTime)
+ || (Iteration >= 3 && MaxNodes && nodes_searched() >= MaxNodes))
+ AbortSearch = true;
}
projects / stockfish / blobdiff