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https://github.com/sockspls/badfish
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Small cleanup in search.cpp
Also clarify some comments. No functional change. Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
parent
12d8f74242
commit
0256db2a11
1 changed files with 123 additions and 134 deletions
257
src/search.cpp
257
src/search.cpp
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@ -41,6 +41,8 @@
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#include "tt.h"
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#include "ucioption.h"
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using std::cout;
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using std::endl;
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////
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//// Local definitions
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@ -86,20 +88,19 @@ namespace {
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};
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// The RootMove class is used for moves at the root at the tree. For each
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// The RootMove class is used for moves at the root at the tree. For each
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// root move, we store a score, a node count, and a PV (really a refutation
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// in the case of moves which fail low).
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struct RootMove {
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RootMove();
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bool operator<(const RootMove&); // used to sort
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bool operator<(const RootMove&) const; // Used to sort
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Move move;
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Value score;
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int64_t nodes, cumulativeNodes;
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int64_t nodes, cumulativeNodes, ourBeta, theirBeta;
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Move pv[PLY_MAX_PLUS_2];
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int64_t ourBeta, theirBeta;
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};
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@ -132,7 +133,7 @@ namespace {
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/// Constants
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// Search depth at iteration 1
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const Depth InitialDepth = OnePly /*+ OnePly/2*/;
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const Depth InitialDepth = OnePly;
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// Depth limit for selective search
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const Depth SelectiveDepth = 7 * OnePly;
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@ -182,8 +183,8 @@ namespace {
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// Each move futility margin is decreased
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const Value IncrementalFutilityMargin = Value(0x8);
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// Razoring
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const Depth RazorDepth = 4*OnePly;
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// Depth limit for razoring
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const Depth RazorDepth = 4 * OnePly;
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// Remaining depth: 1 ply 1.5 ply 2 ply 2.5 ply 3 ply 3.5 ply
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const Value RazorMargins[6] = { Value(0x180), Value(0x300), Value(0x300), Value(0x3C0), Value(0x3C0), Value(0x3C0) };
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@ -195,10 +196,10 @@ namespace {
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/// Variables initialized by UCI options
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// Minimum number of full depth (i.e. non-reduced) moves at PV and non-PV nodes
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int LMRPVMoves, LMRNonPVMoves; // heavy SMP read access for the latter
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int LMRPVMoves, LMRNonPVMoves;
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// Depth limit for use of dynamic threat detection
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Depth ThreatDepth; // heavy SMP read access
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Depth ThreatDepth;
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// Last seconds noise filtering (LSN)
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const bool UseLSNFiltering = true;
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@ -207,13 +208,12 @@ namespace {
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bool loseOnTime = false;
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// Extensions. Array index 0 is used at non-PV nodes, index 1 at PV nodes.
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// There is heavy SMP read access on these arrays
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Depth CheckExtension[2], SingleReplyExtension[2], PawnPushTo7thExtension[2];
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Depth PassedPawnExtension[2], PawnEndgameExtension[2], MateThreatExtension[2];
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// Iteration counters
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int Iteration;
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BetaCounterType BetaCounter; // has per-thread internal data
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BetaCounterType BetaCounter;
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// Scores and number of times the best move changed for each iteration
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IterationInfoType IterationInfo[PLY_MAX_PLUS_2];
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@ -223,18 +223,13 @@ namespace {
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int MultiPV;
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// Time managment variables
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int RootMoveNumber;
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int SearchStartTime;
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int MaxNodes, MaxDepth;
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int MaxSearchTime, AbsoluteMaxSearchTime, ExtraSearchTime, ExactMaxTime;
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int RootMoveNumber;
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bool InfiniteSearch;
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bool PonderSearch;
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bool StopOnPonderhit;
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bool AbortSearch; // heavy SMP read access
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bool Quit;
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bool FailHigh;
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bool FailLow;
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bool Problem;
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bool InfiniteSearch, PonderSearch, StopOnPonderhit;
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bool AbortSearch, Quit;
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bool FailHigh, FailLow, Problem;
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// Show current line?
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bool ShowCurrentLine;
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@ -251,7 +246,7 @@ namespace {
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Lock MPLock;
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Lock IOLock;
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bool AllThreadsShouldExit = false;
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const int MaxActiveSplitPoints = 8;
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const int MaxActiveSplitPoints = 8; // FIXME, sync with UCI Option
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SplitPoint SplitPointStack[THREAD_MAX][MaxActiveSplitPoints];
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bool Idle = true;
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@ -328,8 +323,8 @@ namespace {
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////
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/// perft() is our utility to verify move generation is bug free. All the
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/// legal moves up to given depth are generated and counted and the sum returned.
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/// perft() is our utility to verify move generation is bug free. All the legal
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/// moves up to given depth are generated and counted and the sum returned.
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int perft(Position& pos, Depth depth)
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{
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@ -377,32 +372,28 @@ bool think(const Position& pos, bool infinite, bool ponder, int side_to_move,
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bookMove = OpeningBook.get_move(pos);
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if (bookMove != MOVE_NONE)
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{
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std::cout << "bestmove " << bookMove << std::endl;
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cout << "bestmove " << bookMove << endl;
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return true;
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}
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}
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// Initialize global search variables
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Idle = false;
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Idle = StopOnPonderhit = AbortSearch = Quit = false;
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FailHigh = FailLow = Problem = false;
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SearchStartTime = get_system_time();
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ExactMaxTime = maxTime;
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NodesSincePoll = 0;
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InfiniteSearch = infinite;
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PonderSearch = ponder;
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for (int i = 0; i < THREAD_MAX; i++)
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{
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Threads[i].nodes = 0ULL;
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Threads[i].failHighPly1 = false;
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}
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NodesSincePoll = 0;
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InfiniteSearch = infinite;
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PonderSearch = ponder;
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StopOnPonderhit = false;
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AbortSearch = false;
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Quit = false;
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FailHigh = false;
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FailLow = false;
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Problem = false;
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ExactMaxTime = maxTime;
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if (button_was_pressed("New Game"))
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loseOnTime = false; // reset at the beginning of a new game
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loseOnTime = false; // Reset at the beginning of a new game
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// Read UCI option values
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TT.set_size(get_option_value_int("Hash"));
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@ -469,7 +460,9 @@ bool think(const Position& pos, bool infinite, bool ponder, int side_to_move,
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{
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MaxSearchTime = myTime / 30 + myIncrement;
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AbsoluteMaxSearchTime = Max(myTime / 4, myIncrement - 100);
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} else { // Blitz game without increment
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}
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else // Blitz game without increment
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{
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MaxSearchTime = myTime / 30;
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AbsoluteMaxSearchTime = myTime / 8;
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}
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@ -479,9 +472,10 @@ bool think(const Position& pos, bool infinite, bool ponder, int side_to_move,
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if (movesToGo == 1)
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{
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MaxSearchTime = myTime / 2;
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AbsoluteMaxSearchTime =
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(myTime > 3000)? (myTime - 500) : ((myTime * 3) / 4);
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} else {
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AbsoluteMaxSearchTime = (myTime > 3000)? (myTime - 500) : ((myTime * 3) / 4);
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}
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else
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{
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MaxSearchTime = myTime / Min(movesToGo, 20);
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AbsoluteMaxSearchTime = Min((4 * myTime) / movesToGo, myTime / 3);
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}
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@ -513,13 +507,12 @@ bool think(const Position& pos, bool infinite, bool ponder, int side_to_move,
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// Write information to search log file
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if (UseLogFile)
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LogFile << "Searching: " << pos.to_fen() << std::endl
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LogFile << "Searching: " << pos.to_fen() << endl
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<< "infinite: " << infinite
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<< " ponder: " << ponder
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<< " time: " << myTime
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<< " increment: " << myIncrement
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<< " moves to go: " << movesToGo << std::endl;
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<< " moves to go: " << movesToGo << endl;
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// LSN filtering. Used only for developing purpose. Disabled by default.
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if ( UseLSNFiltering
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@ -527,13 +520,13 @@ bool think(const Position& pos, bool infinite, bool ponder, int side_to_move,
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{
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// Step 2. If after last move we decided to lose on time, do it now!
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while (SearchStartTime + myTime + 1000 > get_system_time())
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; // wait here
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/* wait here */;
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}
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// We're ready to start thinking. Call the iterative deepening loop function
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Value v = id_loop(pos, searchMoves);
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// LSN filtering. Used only for developing purpose. Disabled by default.
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if (UseLSNFiltering)
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{
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// Step 1. If this is sudden death game and our position is hopeless,
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}
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/// init_threads() is called during startup. It launches all helper threads,
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/// init_threads() is called during startup. It launches all helper threads,
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/// and initializes the split point stack and the global locks and condition
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/// objects.
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}
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/// stop_threads() is called when the program exits. It makes all the
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/// stop_threads() is called when the program exits. It makes all the
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/// helper threads exit cleanly.
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void stop_threads() {
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namespace {
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// id_loop() is the main iterative deepening loop. It calls root_search
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// id_loop() is the main iterative deepening loop. It calls root_search
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// repeatedly with increasing depth until the allocated thinking time has
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// been consumed, the user stops the search, or the maximum search depth is
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// reached.
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// Print RootMoveList c'tor startup scoring to the standard output,
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// so that we print information also for iteration 1.
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std::cout << "info depth " << 1 << "\ninfo depth " << 1
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<< " score " << value_to_string(rml.get_move_score(0))
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<< " time " << current_search_time()
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<< " nodes " << nodes_searched()
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<< " nps " << nps()
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<< " pv " << rml.get_move(0) << "\n";
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cout << "info depth " << 1 << "\ninfo depth " << 1
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<< " score " << value_to_string(rml.get_move_score(0))
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<< " time " << current_search_time()
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<< " nodes " << nodes_searched()
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<< " nps " << nps()
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<< " pv " << rml.get_move(0) << "\n";
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// Initialize
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TT.new_search();
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if (Iteration <= 5)
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ExtraSearchTime = 0;
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std::cout << "info depth " << Iteration << std::endl;
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cout << "info depth " << Iteration << endl;
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// Calculate dynamic search window based on previous iterations
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Value alpha, beta;
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speculatedValue = Min(Max(speculatedValue, -VALUE_INFINITE), VALUE_INFINITE);
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IterationInfo[Iteration] = IterationInfoType(value, speculatedValue);
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// Erase the easy move if it differs from the new best move
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// Drop the easy move if it differs from the new best move
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if (ss[0].pv[0] != EasyMove)
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EasyMove = MOVE_NONE;
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// Time to stop?
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bool stopSearch = false;
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// Stop search early if there is only a single legal move
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// Stop search early if there is only a single legal move,
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// we search up to Iteration 6 anyway to get a proper score.
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if (Iteration >= 6 && rml.move_count() == 1)
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stopSearch = true;
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+ BestMoveChangesByIteration[Iteration-1] * (MaxSearchTime / 3);
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// Stop search if most of MaxSearchTime is consumed at the end of the
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// iteration. We probably don't have enough time to search the first
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// iteration. We probably don't have enough time to search the first
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// move at the next iteration anyway.
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if (current_search_time() > ((MaxSearchTime + ExtraSearchTime)*80) / 128)
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if (current_search_time() > ((MaxSearchTime + ExtraSearchTime) * 80) / 128)
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stopSearch = true;
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if (stopSearch)
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wait_for_stop_or_ponderhit();
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else
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// Print final search statistics
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std::cout << "info nodes " << nodes_searched()
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<< " nps " << nps()
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<< " time " << current_search_time()
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<< " hashfull " << TT.full() << std::endl;
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cout << "info nodes " << nodes_searched()
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<< " nps " << nps()
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<< " time " << current_search_time()
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<< " hashfull " << TT.full() << endl;
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// Print the best move and the ponder move to the standard output
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if (ss[0].pv[0] == MOVE_NONE)
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@ -851,11 +845,11 @@ namespace {
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ss[0].pv[0] = rml.get_move(0);
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ss[0].pv[1] = MOVE_NONE;
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}
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std::cout << "bestmove " << ss[0].pv[0];
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cout << "bestmove " << ss[0].pv[0];
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if (ss[0].pv[1] != MOVE_NONE)
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std::cout << " ponder " << ss[0].pv[1];
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cout << " ponder " << ss[0].pv[1];
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std::cout << std::endl;
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cout << endl;
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if (UseLogFile)
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{
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@ -865,25 +859,23 @@ namespace {
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if (dbg_show_hit_rate)
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dbg_print_hit_rate(LogFile);
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StateInfo st;
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LogFile << "Nodes: " << nodes_searched() << std::endl
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<< "Nodes/second: " << nps() << std::endl
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<< "Best move: " << move_to_san(p, ss[0].pv[0]) << std::endl;
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LogFile << "\nNodes: " << nodes_searched()
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<< "\nNodes/second: " << nps()
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<< "\nBest move: " << move_to_san(p, ss[0].pv[0]);
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StateInfo st;
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p.do_move(ss[0].pv[0], st);
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LogFile << "Ponder move: " << move_to_san(p, ss[0].pv[1])
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<< std::endl << std::endl;
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LogFile << "\nPonder move: " << move_to_san(p, ss[0].pv[1]) << endl;
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}
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return rml.get_move_score(0);
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}
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// root_search() is the function which searches the root node. It is
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// root_search() is the function which searches the root node. It is
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// similar to search_pv except that it uses a different move ordering
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// scheme (perhaps we should try to use this at internal PV nodes, too?)
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// and prints some information to the standard output.
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// scheme and prints some information to the standard output.
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Value root_search(Position& pos, SearchStack ss[], RootMoveList &rml, Value alpha, Value beta) {
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Value root_search(Position& pos, SearchStack ss[], RootMoveList& rml, Value alpha, Value beta) {
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Value oldAlpha = alpha;
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Value value;
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RootMoveNumber = i + 1;
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FailHigh = false;
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// Remember the node count before the move is searched. The node counts
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// are used to sort the root moves at the next iteration.
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// Save the current node count before the move is searched
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nodes = nodes_searched();
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// Reset beta cut-off counters
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// Pick the next root move, and print the move and the move number to
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// the standard output.
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move = ss[0].currentMove = rml.get_move(i);
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if (current_search_time() >= 1000)
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std::cout << "info currmove " << move
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<< " currmovenumber " << i + 1 << std::endl;
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cout << "info currmove " << move
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<< " currmovenumber " << RootMoveNumber << endl;
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// Decide search depth for this move
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bool moveIsCheck = pos.move_is_check(move);
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@ -939,17 +931,21 @@ namespace {
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alpha = -VALUE_INFINITE;
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value = -search_pv(pos, ss, -beta, -alpha, newDepth, 1, 0);
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// If the value has dropped a lot compared to the last iteration,
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// set the boolean variable Problem to true. This variable is used
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// for time managment: When Problem is true, we try to complete the
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// current iteration before playing a move.
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Problem = (Iteration >= 2 && value <= IterationInfo[Iteration-1].value - ProblemMargin);
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Problem = ( Iteration >= 2
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&& value <= IterationInfo[Iteration - 1].value - ProblemMargin);
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if (Problem && StopOnPonderhit)
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StopOnPonderhit = false;
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}
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else
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{
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// Try to reduce non-pv search depth by one ply if move seems not problematic,
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// if the move fails high will be re-searched at full depth.
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if ( newDepth >= 3*OnePly
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&& i >= MultiPV + LMRPVMoves
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&& !dangerous
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@ -964,12 +960,13 @@ namespace {
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if (value > alpha)
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{
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value = -search(pos, ss, -alpha, newDepth, 1, true, 0);
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if (value > alpha)
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{
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// Fail high! Set the boolean variable FailHigh to true, and
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// re-search the move with a big window. The variable FailHigh is
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// used for time managment: We try to avoid aborting the search
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// prematurely during a fail high research.
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// re-search the move using a PV search. The variable FailHigh
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// is used for time managment: We try to avoid aborting the
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// search prematurely during a fail high research.
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FailHigh = true;
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value = -search_pv(pos, ss, -beta, -alpha, newDepth, 1, 0);
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}
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@ -986,14 +983,12 @@ namespace {
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if (AbortSearch)
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break;
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// Remember the node count for this move. The node counts are used to
|
||||
// sort the root moves at the next iteration.
|
||||
rml.set_move_nodes(i, nodes_searched() - nodes);
|
||||
|
||||
// Remember the beta-cutoff statistics
|
||||
// Remember beta-cutoff and searched nodes counts for this move. The
|
||||
// info is used to sort the root moves at the next iteration.
|
||||
int64_t our, their;
|
||||
BetaCounter.read(pos.side_to_move(), our, their);
|
||||
rml.set_beta_counters(i, our, their);
|
||||
rml.set_move_nodes(i, nodes_searched() - nodes);
|
||||
|
||||
assert(value >= -VALUE_INFINITE && value <= VALUE_INFINITE);
|
||||
|
||||
|
@ -1018,27 +1013,28 @@ namespace {
|
|||
BestMoveChangesByIteration[Iteration]++;
|
||||
|
||||
// Print search information to the standard output
|
||||
std::cout << "info depth " << Iteration
|
||||
<< " score " << value_to_string(value)
|
||||
<< ((value >= beta)?
|
||||
" lowerbound" : ((value <= alpha)? " upperbound" : ""))
|
||||
<< " time " << current_search_time()
|
||||
<< " nodes " << nodes_searched()
|
||||
<< " nps " << nps()
|
||||
<< " pv ";
|
||||
cout << "info depth " << Iteration
|
||||
<< " score " << value_to_string(value)
|
||||
<< ((value >= beta) ? " lowerbound" :
|
||||
((value <= alpha)? " upperbound" : ""))
|
||||
<< " time " << current_search_time()
|
||||
<< " nodes " << nodes_searched()
|
||||
<< " nps " << nps()
|
||||
<< " pv ";
|
||||
|
||||
for (int j = 0; ss[0].pv[j] != MOVE_NONE && j < PLY_MAX; j++)
|
||||
std::cout << ss[0].pv[j] << " ";
|
||||
cout << ss[0].pv[j] << " ";
|
||||
|
||||
std::cout << std::endl;
|
||||
cout << endl;
|
||||
|
||||
if (UseLogFile)
|
||||
LogFile << pretty_pv(pos, current_search_time(), Iteration, nodes_searched(), value,
|
||||
((value >= beta)? VALUE_TYPE_LOWER
|
||||
: ((value <= alpha)? VALUE_TYPE_UPPER : VALUE_TYPE_EXACT)),
|
||||
ss[0].pv)
|
||||
<< std::endl;
|
||||
{
|
||||
ValueType type = (value >= beta ? VALUE_TYPE_LOWER
|
||||
: (value <= alpha ? VALUE_TYPE_UPPER : VALUE_TYPE_EXACT));
|
||||
|
||||
LogFile << pretty_pv(pos, current_search_time(), Iteration,
|
||||
nodes_searched(), value, type, ss[0].pv) << endl;
|
||||
}
|
||||
if (value > alpha)
|
||||
alpha = value;
|
||||
|
||||
|
@ -1052,23 +1048,22 @@ namespace {
|
|||
rml.sort_multipv(i);
|
||||
for (int j = 0; j < Min(MultiPV, rml.move_count()); j++)
|
||||
{
|
||||
int k;
|
||||
std::cout << "info multipv " << j + 1
|
||||
<< " score " << value_to_string(rml.get_move_score(j))
|
||||
<< " depth " << ((j <= i)? Iteration : Iteration - 1)
|
||||
<< " time " << current_search_time()
|
||||
<< " nodes " << nodes_searched()
|
||||
<< " nps " << nps()
|
||||
<< " pv ";
|
||||
cout << "info multipv " << j + 1
|
||||
<< " score " << value_to_string(rml.get_move_score(j))
|
||||
<< " depth " << ((j <= i)? Iteration : Iteration - 1)
|
||||
<< " time " << current_search_time()
|
||||
<< " nodes " << nodes_searched()
|
||||
<< " nps " << nps()
|
||||
<< " pv ";
|
||||
|
||||
for (k = 0; rml.get_move_pv(j, k) != MOVE_NONE && k < PLY_MAX; k++)
|
||||
std::cout << rml.get_move_pv(j, k) << " ";
|
||||
for (int k = 0; rml.get_move_pv(j, k) != MOVE_NONE && k < PLY_MAX; k++)
|
||||
cout << rml.get_move_pv(j, k) << " ";
|
||||
|
||||
std::cout << std::endl;
|
||||
cout << endl;
|
||||
}
|
||||
alpha = rml.get_move_score(Min(i, MultiPV-1));
|
||||
}
|
||||
} // New best move case
|
||||
} // PV move or new best move
|
||||
|
||||
assert(alpha >= oldAlpha);
|
||||
|
||||
|
@ -1165,10 +1160,9 @@ namespace {
|
|||
// Decide the new search depth
|
||||
ext = extension(pos, move, true, captureOrPromotion, moveIsCheck, singleReply, mateThreat, &dangerous);
|
||||
|
||||
// We want to extend the TT move if it is much better then remaining ones.
|
||||
// To verify this we do a reduced search on all the other moves but the ttMove,
|
||||
// if result is lower then TT value minus a margin then we assume ttMove is the
|
||||
// only one playable. It is a kind of relaxed single reply extension.
|
||||
// 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
|
||||
&& tte
|
||||
&& move == tte->move()
|
||||
|
@ -1182,8 +1176,6 @@ namespace {
|
|||
{
|
||||
Value excValue = search(pos, ss, ttValue - SingleReplyMargin, depth / 2, ply, false, threadID, move);
|
||||
|
||||
// If search result is well below the foreseen score of the ttMove then we
|
||||
// assume ttMove is the only one realistically playable and we extend it.
|
||||
if (excValue < ttValue - SingleReplyMargin)
|
||||
ext = OnePly;
|
||||
}
|
||||
|
@ -1470,10 +1462,9 @@ namespace {
|
|||
// Decide the new search depth
|
||||
ext = extension(pos, move, false, captureOrPromotion, moveIsCheck, singleReply, mateThreat, &dangerous);
|
||||
|
||||
// We want to extend the TT move if it is much better then remaining ones.
|
||||
// To verify this we do a reduced search on all the other moves but the ttMove,
|
||||
// if result is lower then TT value minus a margin then we assume ttMove is the
|
||||
// only one playable. It is a kind of relaxed single reply extension.
|
||||
// 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
|
||||
&& tte
|
||||
&& move == tte->move()
|
||||
|
@ -1488,8 +1479,6 @@ namespace {
|
|||
{
|
||||
Value excValue = search(pos, ss, ttValue - SingleReplyMargin, depth / 2, ply, false, threadID, move);
|
||||
|
||||
// If search result is well below the foreseen score of the ttMove then we
|
||||
// assume ttMove is the only one realistically playable and we extend it.
|
||||
if (excValue < ttValue - SingleReplyMargin)
|
||||
ext = OnePly;
|
||||
}
|
||||
|
@ -2103,7 +2092,7 @@ namespace {
|
|||
// than a move m2 if it has a higher score, or if the moves
|
||||
// have equal score but m1 has the higher node count.
|
||||
|
||||
bool RootMove::operator<(const RootMove& m) {
|
||||
bool RootMove::operator<(const RootMove& m) const {
|
||||
|
||||
if (score != m.score)
|
||||
return (score < m.score);
|
||||
|
@ -2635,8 +2624,8 @@ namespace {
|
|||
if (dbg_show_hit_rate)
|
||||
dbg_print_hit_rate();
|
||||
|
||||
std::cout << "info nodes " << nodes_searched() << " nps " << nps()
|
||||
<< " time " << t << " hashfull " << TT.full() << std::endl;
|
||||
cout << "info nodes " << nodes_searched() << " nps " << nps()
|
||||
<< " time " << t << " hashfull " << TT.full() << endl;
|
||||
lock_release(&IOLock);
|
||||
if (ShowCurrentLine)
|
||||
Threads[0].printCurrentLine = true;
|
||||
|
@ -2687,11 +2676,11 @@ namespace {
|
|||
if (!Threads[threadID].idle)
|
||||
{
|
||||
lock_grab(&IOLock);
|
||||
std::cout << "info currline " << (threadID + 1);
|
||||
cout << "info currline " << (threadID + 1);
|
||||
for (int p = 0; p < ply; p++)
|
||||
std::cout << " " << ss[p].currentMove;
|
||||
cout << " " << ss[p].currentMove;
|
||||
|
||||
std::cout << std::endl;
|
||||
cout << endl;
|
||||
lock_release(&IOLock);
|
||||
}
|
||||
Threads[threadID].printCurrentLine = false;
|
||||
|
|
Loading…
Add table
Reference in a new issue