fix opponent target lockup

game.go

@@ -477,7 +477,7 @@ func (g *Game) PlayerAct(id int, cmd string) *Deck {
 				fmt.Println("opponent target not on board")
 				return nil
 			}
-			if g.GetOpponentBoard(board)[pos].Type != EmptyValue {
+			if g.GetBoard(board)[pos].Type != EmptyValue {
 				fmt.Println("opponent empty target not empty")
 				return nil
 			}