Expose IsRepetitionDraw() for chess states in Python.

PiperOrigin-RevId: 643339231
Change-Id: I943ff69761a89342c4eae13c795a4294809dab77

open_spiel/games/chess/chess.h

@@ -173,14 +173,14 @@ class ChessState : public State {
 
   std::string Serialize() const override;
 
- protected:
-  void DoApplyAction(Action action) override;
-
- private:
   // Draw can be claimed under the FIDE 3-fold repetition rule (the current
   // board position has already appeared twice in the history).
   bool IsRepetitionDraw() const;
 
+ protected:
+  void DoApplyAction(Action action) override;
+
+ private:
   // Calculates legal actions and caches them. This is separate from
   // LegalActions() as there are a number of other methods that need the value
   // of LegalActions. This is a separate method as it's called from

open_spiel/python/pybind11/games_chess.cc

@@ -91,8 +91,9 @@ void open_spiel::init_pyspiel_games_chess(py::module& m) {
   py::classh<ChessState, State>(m, "ChessState")
       .def("board", py::overload_cast<>(&ChessState::Board))
       .def("debug_string", &ChessState::DebugString)
-      .def("parse_move_to_action", &ChessState::ParseMoveToAction)
+      .def("is_repetition_draw", &ChessState::IsRepetitionDraw)
       .def("moves_history", py::overload_cast<>(&ChessState::MovesHistory))
+      .def("parse_move_to_action", &ChessState::ParseMoveToAction)
       // Pickle support
       .def(py::pickle(
           [](const ChessState& state) {  // __getstate__