void set_active_threads(int newActiveThreads) { ActiveThreads = newActiveThreads; }
void incrementNodeCounter(int threadID) { threads[threadID].nodes++; }
void incrementBetaCounter(Color us, Depth d, int threadID) { threads[threadID].betaCutOffs[us] += unsigned(d); }
- void print_current_line(SearchStack ss[], int ply, int threadID);
void resetNodeCounters();
void resetBetaCounters();
Depth depth, int* moves, MovePicker* mp, int master, bool pvNode);
private:
- friend void poll();
+ friend void poll(SearchStack ss[], int ply);
int ActiveThreads;
volatile bool AllThreadsShouldExit, AllThreadsShouldSleep;
Thread threads[MAX_THREADS];
SplitPoint SplitPointStack[MAX_THREADS][ACTIVE_SPLIT_POINTS_MAX];
- Lock MPLock, IOLock;
+ Lock MPLock;
#if !defined(_MSC_VER)
pthread_cond_t WaitCond;
};
- /// Constants
+ /// Adjustments
- // Search depth at iteration 1
- const Depth InitialDepth = OnePly;
-
- // Use internal iterative deepening?
- const bool UseIIDAtPVNodes = true;
- const bool UseIIDAtNonPVNodes = true;
+ // Step 6. Razoring
- // Internal iterative deepening margin. At Non-PV moves, when
- // UseIIDAtNonPVNodes is true, we do an internal iterative deepening
- // search when the static evaluation is at most IIDMargin below beta.
- const Value IIDMargin = Value(0x100);
+ const Depth RazorDepth = 4 * OnePly;
+ inline Value razor_margin(Depth d) { return Value(0x200 + 0x10 * d); }
- // Easy move margin. An easy move candidate must be at least this much
- // better than the second best move.
- const Value EasyMoveMargin = Value(0x200);
+ // Step 8. Null move search with verification search
// Null move margin. A null move search will not be done if the static
// evaluation of the position is more than NullMoveMargin below beta.
const Value NullMoveMargin = Value(0x200);
- // If the TT move is at least SingleReplyMargin better then the
- // remaining ones we will extend it.
- const Value SingleReplyMargin = Value(0x20);
+ // Step 9. Internal iterative deepening
- // Depth limit for razoring
- const Depth RazorDepth = 4 * OnePly;
+ const Depth IIDDepthAtPVNodes = 5 * OnePly;
+ const Depth IIDDepthAtNonPVNodes = 8 * OnePly;
+
+ // Internal iterative deepening margin. At Non-PV nodes
+ // we do an internal iterative deepening
+ // search when the static evaluation is at most IIDMargin below beta.
+ const Value IIDMargin = Value(0x100);
- /// Lookup tables initialized at startup
+ // Step 11. Decide the new search depth
- // Reduction lookup tables and their getter functions
- int8_t PVReductionMatrix[64][64]; // [depth][moveNumber]
- int8_t NonPVReductionMatrix[64][64]; // [depth][moveNumber]
+ // Extensions. Configurable UCI options.
+ // Array index 0 is used at non-PV nodes, index 1 at PV nodes.
+ Depth CheckExtension[2], SingleEvasionExtension[2], PawnPushTo7thExtension[2];
+ Depth PassedPawnExtension[2], PawnEndgameExtension[2], MateThreatExtension[2];
- inline Depth pv_reduction(Depth d, int mn) { return (Depth) PVReductionMatrix[Min(d / 2, 63)][Min(mn, 63)]; }
- inline Depth nonpv_reduction(Depth d, int mn) { return (Depth) NonPVReductionMatrix[Min(d / 2, 63)][Min(mn, 63)]; }
+ const Depth SingularExtensionDepthAtPVNodes = 6 * OnePly;
+ const Depth SingularExtensionDepthAtNonPVNodes = 8 * OnePly;
+
+ // If the TT move is at least SingularExtensionMargin better then the
+ // remaining ones we will extend it.
+ const Value SingularExtensionMargin = Value(0x20);
+
+ // Step 12. Futility pruning
- // Futility lookup tables and their getter functions
const Value FutilityMarginQS = Value(0x80);
+
+ // Futility lookup tables (initialized at startup) and their getter functions
int32_t FutilityMarginsMatrix[14][64]; // [depth][moveNumber]
int FutilityMoveCountArray[32]; // [depth]
inline Value futility_margin(Depth d, int mn) { return Value(d < 7*OnePly ? FutilityMarginsMatrix[Max(d, 0)][Min(mn, 63)] : 2 * VALUE_INFINITE); }
inline int futility_move_count(Depth d) { return d < 16*OnePly ? FutilityMoveCountArray[d] : 512; }
+ // Step 14. Reduced search
+
+ // Reduction lookup tables (initialized at startup) and their getter functions
+ int8_t PVReductionMatrix[64][64]; // [depth][moveNumber]
+ int8_t NonPVReductionMatrix[64][64]; // [depth][moveNumber]
+
+ inline Depth pv_reduction(Depth d, int mn) { return (Depth) PVReductionMatrix[Min(d / 2, 63)][Min(mn, 63)]; }
+ inline Depth nonpv_reduction(Depth d, int mn) { return (Depth) NonPVReductionMatrix[Min(d / 2, 63)][Min(mn, 63)]; }
+
+
+
+ // Search depth at iteration 1
+ const Depth InitialDepth = OnePly;
+
+ // Easy move margin. An easy move candidate must be at least this much
+ // better than the second best move.
+ const Value EasyMoveMargin = Value(0x200);
+
/// Variables initialized by UCI options
// Depth limit for use of dynamic threat detection
const Value LSNValue = value_from_centipawns(200);
bool loseOnTime = false;
- // Extensions. Array index 0 is used at non-PV nodes, index 1 at PV nodes.
- Depth CheckExtension[2], SingleEvasionExtension[2], PawnPushTo7thExtension[2];
- Depth PassedPawnExtension[2], PawnEndgameExtension[2], MateThreatExtension[2];
-
// Iteration counters
int Iteration;
int current_search_time();
int nps();
- void poll();
+ void poll(SearchStack ss[], int ply);
void ponderhit();
void wait_for_stop_or_ponderhit();
void init_ss_array(SearchStack ss[]);
assert(threadID >= 0 && threadID < TM.active_threads());
Move movesSearched[256];
+ EvalInfo ei;
StateInfo st;
const TTEntry* tte;
Move ttMove, move;
Depth ext, newDepth;
- Value oldAlpha, value;
- bool isCheck, mateThreat, singleEvasion, moveIsCheck, captureOrPromotion, dangerous;
+ Value bestValue, value, oldAlpha;
+ bool isCheck, singleEvasion, moveIsCheck, captureOrPromotion, dangerous;
+ bool mateThreat = false;
int moveCount = 0;
- Value bestValue = value = -VALUE_INFINITE;
+ bestValue = value = -VALUE_INFINITE;
if (depth < OnePly)
return qsearch(pos, ss, alpha, beta, Depth(0), ply, threadID);
isCheck = pos.is_check();
if (!isCheck)
{
- EvalInfo ei;
ss[ply].eval = evaluate(pos, ei, threadID);
update_gains(pos, ss[ply - 1].currentMove, ss[ply - 1].eval, ss[ply].eval);
}
// Step 8. Null move search with verification search (is omitted in PV nodes)
// Step 9. Internal iterative deepening
- if ( UseIIDAtPVNodes
- && depth >= 5*OnePly
+ if ( depth >= IIDDepthAtPVNodes
&& ttMove == MOVE_NONE)
{
search_pv(pos, ss, alpha, beta, depth-2*OnePly, ply, threadID);
// Singular extension search. We extend the TT move if its value is much better than
// its siblings. To verify this we do a reduced search on all the other moves but the
// ttMove, if result is lower then ttValue minus a margin then we extend ttMove.
- if ( depth >= 6 * OnePly
+ if ( depth >= SingularExtensionDepthAtPVNodes
&& tte
&& move == tte->move()
&& ext < OnePly
if (abs(ttValue) < VALUE_KNOWN_WIN)
{
- Value excValue = search(pos, ss, ttValue - SingleReplyMargin, depth / 2, ply, false, threadID, move);
+ Value excValue = search(pos, ss, ttValue - SingularExtensionMargin, depth / 2, ply, false, threadID, move);
- if (excValue < ttValue - SingleReplyMargin)
+ if (excValue < ttValue - SingularExtensionMargin)
ext = OnePly;
}
}
if ( !value_is_mate(beta)
&& !isCheck
&& depth < RazorDepth
- && refinedValue < beta - (0x200 + 16 * depth)
+ && refinedValue < beta - razor_margin(depth)
&& ss[ply - 1].currentMove != MOVE_NULL
&& ttMove == MOVE_NONE
&& !pos.has_pawn_on_7th(pos.side_to_move()))
{
- Value rbeta = beta - (0x200 + 16 * depth);
+ Value rbeta = beta - razor_margin(depth);
Value v = qsearch(pos, ss, rbeta-1, rbeta, Depth(0), ply, threadID);
if (v < rbeta)
- return v; //FIXME: Logically should be: return (v + 0x200 + 16 * depth);
+ return v; //FIXME: Logically should be: return (v + razor_margin(depth));
}
// Step 7. Static null move pruning
}
// Step 9. Internal iterative deepening
- if (UseIIDAtNonPVNodes && ttMove == MOVE_NONE && depth >= 8*OnePly &&
- !isCheck && ss[ply].eval >= beta - IIDMargin)
+ if ( depth >= IIDDepthAtNonPVNodes
+ && ttMove == MOVE_NONE
+ && !isCheck
+ && ss[ply].eval >= beta - IIDMargin)
{
search(pos, ss, beta, depth/2, ply, false, threadID);
ttMove = ss[ply].pv[ply];
// Singular extension search. We extend the TT move if its value is much better than
// its siblings. To verify this we do a reduced search on all the other moves but the
// ttMove, if result is lower then ttValue minus a margin then we extend ttMove.
- if ( depth >= 8 * OnePly
+ if ( depth >= SingularExtensionDepthAtNonPVNodes
&& tte
&& move == tte->move()
&& !excludedMove // Do not allow recursive single-reply search
if (abs(ttValue) < VALUE_KNOWN_WIN)
{
- Value excValue = search(pos, ss, ttValue - SingleReplyMargin, depth / 2, ply, false, threadID, move);
+ Value excValue = search(pos, ss, ttValue - SingularExtensionMargin, depth / 2, ply, false, threadID, move);
- if (excValue < ttValue - SingleReplyMargin)
+ if (excValue < ttValue - SingularExtensionMargin)
ext = OnePly;
}
}
continue;
// Value based pruning
- Depth predictedDepth = newDepth - nonpv_reduction(depth, moveCount); //FIXME: We are ignoring condition: depth >= 3*OnePly, BUG??
+ Depth predictedDepth = newDepth - nonpv_reduction(depth, moveCount); // We illogically ignore reduction condition depth >= 3*OnePly
futilityValueScaled = ss[ply].eval + futility_margin(predictedDepth, moveCount)
+ H.gain(pos.piece_on(move_from(move)), move_to(move)) + 45;
// splitting, we don't have to repeat all this work in sp_search(). We
// also don't need to store anything to the hash table here: This is taken
// care of after we return from the split point.
+ // FIXME: We are currently ignoring mateThreat flag here
void sp_search(SplitPoint* sp, int threadID) {
assert(threadID >= 0 && threadID < TM.active_threads());
assert(TM.active_threads() > 1);
- Position pos(*sp->pos);
- CheckInfo ci(pos);
- SearchStack* ss = sp->sstack[threadID];
StateInfo st;
- Value value = -VALUE_INFINITE;
Move move;
+ Depth ext, newDepth;
+ Value value, futilityValueScaled;
+ bool isCheck, moveIsCheck, captureOrPromotion, dangerous;
int moveCount;
- bool isCheck = pos.is_check();
+ value = -VALUE_INFINITE;
+
+ Position pos(*sp->pos);
+ CheckInfo ci(pos);
+ SearchStack* ss = sp->sstack[threadID];
+ isCheck = pos.is_check();
// Step 10. Loop through moves
// Loop through all legal moves until no moves remain or a beta cutoff occurs
assert(move_is_ok(move));
- bool moveIsCheck = pos.move_is_check(move, ci);
- bool captureOrPromotion = pos.move_is_capture_or_promotion(move);
+ moveIsCheck = pos.move_is_check(move, ci);
+ captureOrPromotion = pos.move_is_capture_or_promotion(move);
// Step 11. Decide the new search depth
- bool dangerous;
- Depth ext = extension(pos, move, false, captureOrPromotion, moveIsCheck, false, false, &dangerous);
- Depth newDepth = sp->depth - OnePly + ext;
+ ext = extension(pos, move, false, captureOrPromotion, moveIsCheck, false, false, &dangerous);
+ newDepth = sp->depth - OnePly + ext;
// Update current move
ss[sp->ply].currentMove = move;
// Value based pruning
Depth predictedDepth = newDepth - nonpv_reduction(sp->depth, moveCount);
- Value futilityValueScaled = ss[sp->ply].eval + futility_margin(predictedDepth, moveCount)
+ futilityValueScaled = ss[sp->ply].eval + futility_margin(predictedDepth, moveCount)
+ H.gain(pos.piece_on(move_from(move)), move_to(move)) + 45;
if (futilityValueScaled < sp->beta)
// don't have to repeat all this work in sp_search_pv(). We also don't
// need to store anything to the hash table here: This is taken care of
// after we return from the split point.
+ // FIXME: We are ignoring mateThreat flag!
void sp_search_pv(SplitPoint* sp, int threadID) {
assert(threadID >= 0 && threadID < TM.active_threads());
assert(TM.active_threads() > 1);
+ StateInfo st;
+ Move move;
+ Depth ext, newDepth;
+ Value value;
+ bool moveIsCheck, captureOrPromotion, dangerous;
+ int moveCount;
+ value = -VALUE_INFINITE;
+
Position pos(*sp->pos);
CheckInfo ci(pos);
SearchStack* ss = sp->sstack[threadID];
- StateInfo st;
- Value value = -VALUE_INFINITE;
- int moveCount;
- Move move;
// Step 10. Loop through moves
// Loop through all legal moves until no moves remain or a beta cutoff occurs
assert(move_is_ok(move));
- bool moveIsCheck = pos.move_is_check(move, ci);
- bool captureOrPromotion = pos.move_is_capture_or_promotion(move);
+ moveIsCheck = pos.move_is_check(move, ci);
+ captureOrPromotion = pos.move_is_capture_or_promotion(move);
// Step 11. Decide the new search depth
- bool dangerous;
- Depth ext = extension(pos, move, true, captureOrPromotion, moveIsCheck, false, false, &dangerous);
- Depth newDepth = sp->depth - OnePly + ext;
+ ext = extension(pos, move, true, captureOrPromotion, moveIsCheck, false, false, &dangerous);
+ newDepth = sp->depth - OnePly + ext;
// Update current move
ss[sp->ply].currentMove = move;
NodesSincePoll++;
if (NodesSincePoll >= NodesBetweenPolls)
{
- poll();
+ poll(ss, ply);
NodesSincePoll = 0;
}
}
ss[ply].init(ply);
ss[ply + 2].initKillers();
- TM.print_current_line(ss, ply, threadID);
}
// looks at the time consumed so far and decides if it's time to abort the
// search.
- void poll() {
+ void poll(SearchStack ss[], int ply) {
static int lastInfoTime;
int t = current_search_time();
else if (t - lastInfoTime >= 1000)
{
lastInfoTime = t;
- lock_grab(&TM.IOLock);
if (dbg_show_mean)
dbg_print_mean();
cout << "info nodes " << TM.nodes_searched() << " nps " << nps()
<< " time " << t << " hashfull " << TT.full() << endl;
- lock_release(&TM.IOLock);
+ // We only support current line printing in single thread mode
+ if (ShowCurrentLine && TM.active_threads() == 1)
+ {
+ cout << "info currline";
+ for (int p = 0; p < ply; p++)
+ cout << " " << ss[p].currentMove;
- if (ShowCurrentLine)
- TM.threads[0].printCurrentLineRequest = true;
+ cout << endl;
+ }
}
// Should we stop the search?
// Initialize global locks
lock_init(&MPLock, NULL);
- lock_init(&IOLock, NULL);
// Initialize SplitPointStack locks
for (i = 0; i < MAX_THREADS; i++)
// This makes the threads to go to sleep
AllThreadsShouldSleep = true;
-
- // Reset flags to a known state.
- for (int i = 1; i < ActiveThreads; i++)
- {
- // This flag can be in a random state
- threads[i].printCurrentLineRequest = false;
- }
}
- // print_current_line() prints _once_ the current line of search for a
- // given thread and then setup the print request for the next thread.
- // Called when the UCI option UCI_ShowCurrLine is 'true'.
-
- void ThreadsManager::print_current_line(SearchStack ss[], int ply, int threadID) {
-
- assert(ply >= 0 && ply < PLY_MAX);
- assert(threadID >= 0 && threadID < ActiveThreads);
-
- if (!threads[threadID].printCurrentLineRequest)
- return;
-
- // One shot only
- threads[threadID].printCurrentLineRequest = false;
-
- if (threads[threadID].state == THREAD_SEARCHING)
- {
- lock_grab(&IOLock);
- cout << "info currline " << (threadID + 1);
- for (int p = 0; p < ply; p++)
- cout << " " << ss[p].currentMove;
-
- cout << endl;
- lock_release(&IOLock);
- }
-
- // Setup print request for the next thread ID
- if (threadID + 1 < ActiveThreads)
- threads[threadID + 1].printCurrentLineRequest = true;
- }
-
-
/// The RootMoveList class
// RootMoveList c'tor
projects / stockfish / blobdiff