diff --git a/src/othello/State.java b/src/othello/State.java
index 818bc6d..92de7d1 100644
--- a/src/othello/State.java
+++ b/src/othello/State.java
@@ -146,5 +146,17 @@ public class State {
 		}
 		return str.toString();
 	}
-	
+	@Override
+	public boolean equals(Object state) {
+		boolean bool;
+		bool = ( state instanceof State);
+		bool = bool && (this.getCurrentPlayer() ==  ((State) state).getCurrentPlayer()) && (this.player1 == ((State) state).player1) && (this.player2 == ((State) state).player2);
+		bool = bool && (this.n1 == ((State)state).n1)&& (this.n2 == ((State)state).n2);
+		for (int i = 0; i < this.board.length; i++) {
+			for (int y = 0; y < this.board.length; y++){
+				bool = bool && (this.board[i][y] == ((State)state).board[i][y]);
+			}
+		}
+		return bool;
+	}
 }
diff --git a/src/othello/players/NegamaxPlayer.java b/src/othello/players/NegamaxPlayer.java
index 0e68390..ac90df6 100644
--- a/src/othello/players/NegamaxPlayer.java
+++ b/src/othello/players/NegamaxPlayer.java
@@ -16,7 +16,7 @@ public class NegamaxPlayer extends Player {
         Pair<Point, Point> bestMove = null;
         for(Pair<Point, Point> move : game.getMove(game.getCurrentPlayer())) {
             State nextState = game.play(move);
-            int value = -negamax(nextState, this.depth,Integer.MIN_VALUE,Integer.MAX_VALUE);
+            int value = -negamax(nextState, this.depth);
             if (value > bestValue) {
                 bestValue = value;
                 bestMove = move;
@@ -25,7 +25,7 @@ public class NegamaxPlayer extends Player {
         return bestMove;
     }
 
-    private int negamax(State state, int depth,int alpha,int beta) {
+    private int negamax(State state, int depth) {
         if(depth == 0 || state.isOver()) {
             return evaluate(state);
         }
@@ -33,10 +33,7 @@ public class NegamaxPlayer extends Player {
             int m = Integer.MIN_VALUE;
             for (Pair<Point, Point> move : state.getMove(state.getCurrentPlayer())) {
                 State nextState = state.play(move);
-                m= Math.max(m,-negamax(nextState,depth-1,alpha,beta));
-                alpha = Math.max(alpha, m);
-                if(alpha >= beta)
-                    break;
+                m= Math.max(m,-negamax(nextState,depth-1));
             }
             return m;
         }