preventing 3 fold repetion

1 files changed, 9 insertions, 0 deletions

diff --git a/src/board.cpp b/src/board.cpp
index 0698571..e058df4 100644
--- a/src/board.cpp
+++ b/src/board.cpp
@@ -1,5 +1,6 @@
 #include "board.hpp"
 #include "bot.hpp"
+#include "zobrist.hpp"
 #include <cassert>
 #include <cstdio>
 #include <iostream>
@@ -143,6 +144,14 @@ void PlayMove(Move move, Game *b) {
   }
   b->pieces[PositionToIndex(move.To)] = piece;
   b->pieces[PositionToIndex(move.From)] = {false, NONE, false};
+
   b->turn = !b->turn;
+
+  uint64_t key = GenerateZobristKey(b);
+
+  b->ThreeFoldMap[key]++;
+  if (b->ThreeFoldMap[key] >= 3) {
+    b->state = DRAW;
+  }
 };
 int PositionToIndex(Position i) { return i.rank * 8 + i.file; }