Tuning

eval.cpp

@@ -29,7 +29,7 @@ Value *mgPst[] = { nullptr, mg_pawn_table, mg_knight_table, mg_bishop_table, mg_
 Value *egPst[] = { nullptr, eg_pawn_table, eg_knight_table, eg_bishop_table, eg_rook_table, eg_queen_table, eg_king_table };
 
 // tuning slop here
-/*
+
 TUNE(SetRange(5, 30),
      tempo,
      SetRange(80, 120),
@@ -225,7 +225,7 @@ TUNE(SetRange(10, 100), minorImWt, SetRange(5, 50), bishopImWt, SetRange(10, 100
 TUNE(SetRange(1, 50), rammedPawnPenalty);
 TUNE(SetRange(1, 100), rookOnSeventhBonus);
 TUNE(SetRange(1, 50), earlyQueenPenalty);
-*/
+
 EvalComponents eval_components(const chess::Position &board) {
     constexpr int KnightPhase = 1;
     constexpr int BishopPhase = 1;

main.cpp

@@ -12,6 +12,7 @@ using namespace engine;
 int main() {
     std::cout << std::unitbuf;
     std::cout << "cppchess_engine version " << BUILD_VERSION << '\n';
+    options.add("Threads", Option(1, 1, 1));
     options.add("Move Overhead", Option(10, 0, 1000));
     options.add("Hash", Option(16, 1, 1 << 25, [](const Option &o) {
                     try {

search.cpp

@@ -358,7 +358,7 @@ Value doSearch(
     Value maxScore = -VALUE_INFINITE;
     Move bestMove = Move::none();
     int movesSearched = 0;
-
+    Movelist quietsSearched;
     for (size_t i = 0; i < moves.size(); ++i) {
         Move move = moves[i];
         if (ply == 0 && !session.tc.searchmoves.empty() &&
@@ -419,7 +419,7 @@ Value doSearch(
             ext = 1;
         if (ext == 0 && moves.size() == 1)
             ext = 1;
-        if (ext == 0 && isCapture && movesSearched == 0)
+        if (ext == 0 && isCapture)
             ext = 1;
         board.doMove(move);
 
@@ -453,30 +453,28 @@ Value doSearch(
 
         board.undoMove();
         movesSearched++;
-
+        if (!isCapture && !givesCheck)
+            quietsSearched.push_back(move);
         if (score > maxScore) {
             maxScore = score;
             bestMove = move;
         }
 
-        if (score > alpha) {
+        if (score > alpha)
             alpha = score;
 
+        if (alpha >= beta) {
             if (!isCapture) {
                 int bonus = depth * depth;
                 if (is_win(score))
                     bonus += 4 * depth * depth;
                 session.historyHeuristic[(int)move.from()][(int)move.to()] =
                     std::clamp(session.historyHeuristic[(int)move.from()][(int)move.to()] + bonus, -16384, 16384);
-            }
-        } /*else if (!isCapture && depth > 0) {
-            int malus = -depth * depth;
-            session.historyHeuristic[(int)move.from()][(int)move.to()] =
-                std::clamp(session.historyHeuristic[(int)move.from()][(int)move.to()] + malus, -16384, 16384);
-        }*/
-
-        if (alpha >= beta) {
-            if (!isCapture) {
+                int malus = 300 * depth - 250;
+                for (Move move_ : quietsSearched)
+                    if (move_ != move)
+                        session.historyHeuristic[(int)move_.from()][(int)move_.to()] =
+                            std::clamp(session.historyHeuristic[(int)move_.from()][(int)move_.to()] - malus, -16384, 16384);
                 if (session.killerMoves[ply][0] != move) {
                     session.killerMoves[ply][1] = session.killerMoves[ply][0];
                     session.killerMoves[ply][0] = move;
@@ -528,7 +526,7 @@ std::string extract_pv(const chess::Position &root, int maxPly) {
     return pv;
 }
 
-void search(const chess::Position &board, const timeman::LimitsType timecontrol) {
+uint64_t search(const chess::Position &board, const timeman::LimitsType timecontrol) {
     stopSearch = false;
     tt.newSearch();
     static double originalTimeAdjust = -1;
@@ -655,5 +653,6 @@ void search(const chess::Position &board, const timeman::LimitsType timecontrol)
         if (entry && entry->getMove() != Move::none().raw())
             report(chess::uci::moveToUci(Move(entry->getMove()), board.chess960()));
     }
+    return session.nodes;
 }
 } // namespace engine::search

search.h

@@ -2,6 +2,7 @@
 #include "eval.h"
 #include "timeman.h"
 #include "tt.h"
+#include <cstdint>
 #include <position.h>
 namespace engine::search {
 struct Session {
@@ -18,7 +19,7 @@ struct Session {
     chess::Color ogcolor;
 };
 void stop();
-void search(const chess::Position &, const timeman::LimitsType);
+uint64_t search(const chess::Position &, const timeman::LimitsType);
 bool isStopped();
 extern engine::TranspositionTable tt;
 } // namespace engine::search

timeman.cpp

@@ -22,12 +22,12 @@ void TimeManagement::init(LimitsType &limits, chess::Color us, int ply, double &
 
     // If we have no time, we don't need to fully initialize TM.
     // startTime is used by movetime and useNodesTime is used in elapsed calls.
-    startTime = limits.startTime;
+    startTime = now();
     if (limits.movetime != 0) {
         optimumTime = maximumTime = TimePoint(limits.movetime);
         return;
     }
-    if (limits.time[us] == 0 && limits.movetime == 0) {
+    if (!limits.use_time_management()) {
         optimumTime = maximumTime = INFINITE_TIME;
         return;
     }

timeman.h

@@ -15,7 +15,7 @@ struct LimitsType {
 
     // Init explicitly due to broken value-initialization of non POD in MSVC
     LimitsType() {
-        time[chess::WHITE] = time[chess::BLACK] = inc[chess::WHITE] = inc[chess::BLACK] = movetime = startTime = TimePoint(0);
+        time[chess::WHITE] = time[chess::BLACK] = inc[chess::WHITE] = inc[chess::BLACK] = movetime = TimePoint(0);
         movestogo = mate = perft = infinite = 0;
         depth = 64;
         nodes = 0;
@@ -25,7 +25,7 @@ struct LimitsType {
     bool use_time_management() const { return time[chess::WHITE] || time[chess::BLACK]; }
 
     std::vector<std::string> searchmoves;
-    TimePoint time[chess::COLOR_NB], inc[chess::COLOR_NB], movetime, startTime;
+    TimePoint time[chess::COLOR_NB], inc[chess::COLOR_NB], movetime;
     int movestogo, depth, mate, perft, infinite;
     uint64_t nodes;
     bool ponderMode;

uci.cpp

@@ -83,8 +83,6 @@ timeman::LimitsType parse_limits(std::istream &is) {
     timeman::LimitsType limits;
     std::string token;
 
-    limits.startTime = timeman::now(); // The search starts as early as possible
-
     while (is >> token)
         if (token == "searchmoves") // Needs to be the last command on the line
             while (is >> token) {
@@ -240,6 +238,76 @@ void execCmd(const std::string &line) {
                 score = -score;
             std::cout << score << std::endl;
             break;
+        } else if (token == "bench") {
+            uint64_t nodes = 0;
+            const std::vector<std::string> Defaults = {
+                "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1",
+                "r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - 0 10",
+                "8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - - 0 11",
+                "4rrk1/pp1n3p/3q2pQ/2p1pb2/2PP4/2P3N1/P2B2PP/4RRK1 b - - 7 19",
+                "rq3rk1/ppp2ppp/1bnpb3/3N2B1/3NP3/7P/PPPQ1PP1/2KR3R w - - 7 14 moves d4e6",
+                "r1bq1r1k/1pp1n1pp/1p1p4/4p2Q/4Pp2/1BNP4/PPP2PPP/3R1RK1 w - - 2 14 moves g2g4",
+                "r3r1k1/2p2ppp/p1p1bn2/8/1q2P3/2NPQN2/PPP3PP/R4RK1 b - - 2 15",
+                "r1bbk1nr/pp3p1p/2n5/1N4p1/2Np1B2/8/PPP2PPP/2KR1B1R w kq - 0 13",
+                "r1bq1rk1/ppp1nppp/4n3/3p3Q/3P4/1BP1B3/PP1N2PP/R4RK1 w - - 1 16",
+                "4r1k1/r1q2ppp/ppp2n2/4P3/5Rb1/1N1BQ3/PPP3PP/R5K1 w - - 1 17",
+                "2rqkb1r/ppp2p2/2npb1p1/1N1Nn2p/2P1PP2/8/PP2B1PP/R1BQK2R b KQ - 0 11",
+                "r1bq1r1k/b1p1npp1/p2p3p/1p6/3PP3/1B2NN2/PP3PPP/R2Q1RK1 w - - 1 16",
+                "3r1rk1/p5pp/bpp1pp2/8/q1PP1P2/b3P3/P2NQRPP/1R2B1K1 b - - 6 22",
+                "r1q2rk1/2p1bppp/2Pp4/p6b/Q1PNp3/4B3/PP1R1PPP/2K4R w - - 2 18",
+                "4k2r/1pb2ppp/1p2p3/1R1p4/3P4/2r1PN2/P4PPP/1R4K1 b - - 3 22",
+                "3q2k1/pb3p1p/4pbp1/2r5/PpN2N2/1P2P2P/5PP1/Q2R2K1 b - - 4 26",
+                "6k1/6p1/6Pp/ppp5/3pn2P/1P3K2/1PP2P2/3N4 b - - 0 1",
+                "3b4/5kp1/1p1p1p1p/pP1PpP1P/P1P1P3/3KN3/8/8 w - - 0 1",
+                "2K5/p7/7P/5pR1/8/5k2/r7/8 w - - 0 1 moves g5g6 f3e3 g6g5 e3f3",
+                "8/6pk/1p6/8/PP3p1p/5P2/4KP1q/3Q4 w - - 0 1",
+                "7k/3p2pp/4q3/8/4Q3/5Kp1/P6b/8 w - - 0 1",
+                "8/2p5/8/2kPKp1p/2p4P/2P5/3P4/8 w - - 0 1",
+                "8/1p3pp1/7p/5P1P/2k3P1/8/2K2P2/8 w - - 0 1",
+                "8/pp2r1k1/2p1p3/3pP2p/1P1P1P1P/P5KR/8/8 w - - 0 1",
+                "8/3p4/p1bk3p/Pp6/1Kp1PpPp/2P2P1P/2P5/5B2 b - - 0 1",
+                "5k2/7R/4P2p/5K2/p1r2P1p/8/8/8 b - - 0 1",
+                "6k1/6p1/P6p/r1N5/5p2/7P/1b3PP1/4R1K1 w - - 0 1",
+                "1r3k2/4q3/2Pp3b/3Bp3/2Q2p2/1p1P2P1/1P2KP2/3N4 w - - 0 1",
+                "6k1/4pp1p/3p2p1/P1pPb3/R7/1r2P1PP/3B1P2/6K1 w - - 0 1",
+                "8/3p3B/5p2/5P2/p7/PP5b/k7/6K1 w - - 0 1",
+                "5rk1/q6p/2p3bR/1pPp1rP1/1P1Pp3/P3B1Q1/1K3P2/R7 w - - 93 90",
+                "4rrk1/1p1nq3/p7/2p1P1pp/3P2bp/3Q1Bn1/PPPB4/1K2R1NR w - - 40 21",
+                "r3k2r/3nnpbp/q2pp1p1/p7/Pp1PPPP1/4BNN1/1P5P/R2Q1RK1 w kq - 0 16",
+                "3Qb1k1/1r2ppb1/pN1n2q1/Pp1Pp1Pr/4P2p/4BP2/4B1R1/1R5K b - - 11 40",
+                "4k3/3q1r2/1N2r1b1/3ppN2/2nPP3/1B1R2n1/2R1Q3/3K4 w - - 5 1",
+                "1r6/1P4bk/3qr1p1/N6p/3pp2P/6R1/3Q1PP1/1R4K1 w - - 1 42",
+
+                // 5-man positions
+                "8/8/8/8/5kp1/P7/8/1K1N4 w - - 0 1",  // Kc2 - mate
+                "8/8/8/5N2/8/p7/8/2NK3k w - - 0 1",   // Na2 - mate
+                "8/3k4/8/8/8/4B3/4KB2/2B5 w - - 0 1", // draw
+
+                // 6-man positions
+                "8/8/1P6/5pr1/8/4R3/7k/2K5 w - - 0 1",  // Re5 - mate
+                "8/2p4P/8/kr6/6R1/8/8/1K6 w - - 0 1",   // Ka2 - mate
+                "8/8/3P3k/8/1p6/8/1P6/1K3n2 b - - 0 1", // Nd2 - draw
+
+                // 7-man positions
+                "8/R7/2q5/8/6k1/8/1P5p/K6R w - - 0 124", // Draw
+
+                // Mate and stalemate positions
+                "6k1/3b3r/1p1p4/p1n2p2/1PPNpP1q/P3Q1p1/1R1RB1P1/5K2 b - - 0 1",
+                "r2r1n2/pp2bk2/2p1p2p/3q4/3PN1QP/2P3R1/P4PP1/5RK1 w - - 0 1",
+                "8/8/8/8/8/6k1/6p1/6K1 w - -",
+                "7k/7P/6K1/8/3B4/8/8/8 b - -",
+            };
+            timeman::LimitsType tc{};
+            tc.depth = 10;
+            auto start = std::chrono::high_resolution_clock::now();
+            for (auto &fen : Defaults) {
+                std::cerr << fen << '\n';
+                chess::Position pos(fen);
+                nodes += search::search(pos, tc);
+            }
+            auto end = std::chrono::high_resolution_clock::now();
+            auto duration_ms = std::chrono::duration_cast<std::chrono::milliseconds>(end - start).count();
+            std::cout << "nodes " << nodes << " nps " << nodes / (duration_ms / 1000.0) << std::endl;
         } else if (token == "export_weights") {
             std::string weights_header = "Weights.h";
             ss >> weights_header;