oops

app/src/main/java/chess/model/pieces/Knight.java

@@ -20,8 +20,7 @@ public class Knight extends Piece {
 		return 2;
 	}
 
-	@Override
-	public boolean equals(Piece obj) {
+	public boolean equals(Object obj) {
 		return (obj instanceof Knight && ((Knight) obj).getColor() == this.getColor());
 	}
 }