Added use endgame option.

megalodon-chess · Apr 1, 2021 · 0a40683 · 0a40683
1 parent 3159e87
commit 0a40683
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Showing 4 changed files with 6 additions and 1 deletion.
diff --git a/src/options.cpp b/src/options.cpp
@@ -36,6 +36,7 @@ Options::Options() {
     ABPassStart = 5;
     ABPassMargin = 500;
     MoveTimeMult = 100;
+    UseEndgame = true;
 
     EvalMaterial   = 100;
     EvalPawnStruct = 100;

diff --git a/src/options.hpp b/src/options.hpp
@@ -37,6 +37,7 @@ UseHashTable: type=check, default=false, whether the engine should use hash tabl
 ABPassStart: type=spin, default=5, min=1, max=100, start depth where alpha and beta values are passed to next iteration.
 ABPassMargin: type=spin, default=500, min=0, max=10000, add/sub offset of alpha and beta.
 MoveTimeMult: type=spin, default=100, min=10, max=1000, multiplier (percent) of move time.
+UseEndgame: type=check, default=true, whether to use endgame algorithms.
 
 EvalMaterial: type=spin, default=100, min=0, max=1000, weight (percent) of material eval.
 EvalPawnStruct: type=spin, default=100, min=0, max=1000, weight (percent) of pawn structure eval.
@@ -62,6 +63,7 @@ Chat: type=check, default=true, whether the engine should chat with you.
     int ABPassStart;
     int ABPassMargin;
     int MoveTimeMult;
+    bool UseEndgame;
 
     int EvalMaterial;
     int EvalPawnStruct;

diff --git a/src/search.cpp b/src/search.cpp
@@ -166,7 +166,7 @@ namespace Search {
 
     SearchInfo search(const Options& options, const Position& pos, const int& depth, const double& movetime, bool& searching) {
         const int eg = Endgame::eg_type(pos);
-        if (eg != 0) {
+        if (options.UseEndgame && eg != 0) {
             const vector<Move> moves = Bitboard::legal_moves(pos, Bitboard::attacked(pos, !pos.turn));
             const Move best_move = Endgame::bestmove(pos, moves, eg);
             return SearchInfo(1, 1, false, pos.turn ? MAX : MIN, moves.size(), 0, 0, {best_move}, 0, 0, true);

diff --git a/src/uci.cpp b/src/uci.cpp
@@ -200,6 +200,7 @@ int loop() {
             cout << "option name ABPassStart type spin default 5 min 1 max 100" << "\n";
             cout << "option name ABPassMargin type spin default 500 min 0 max 10000" << "\n";
             cout << "option name MoveTimeMult type spin default 100 min 10 max 1000" << "\n";
+            cout << "option name UseEndgame type check default true" << "\n";
 
             cout << "option name EvalMaterial type spin default 100 min 0 max 1000" << "\n";
             cout << "option name EvalPawnStruct type spin default 100 min 0 max 1000" << "\n";
@@ -226,6 +227,7 @@ int loop() {
             else if (name == "ABPassStart") options.ABPassStart = std::stoi(value);
             else if (name == "ABPassMargin") options.ABPassMargin = std::stoi(value);
             else if (name == "MoveTimeMult") options.MoveTimeMult = std::stoi(value);
+            else if (name == "UseEndgame") options.UseEndgame = (value == "true");
 
             else if (name == "EvalMaterial") options.EvalMaterial = std::stoi(value);
             else if (name == "EvalPawnStruct") options.EvalPawnStruct = std::stoi(value);