Mahjong; 10 of Mistakes' : 7
捨て牌を見ない。
テンパイして初めて場を見て、そこで初めて自分の待ちが少ないことに気づく。自分の手に３割、捨て牌に７割（せめて４：６）ぐらいの割合で見るのが良いと思う。
以下、海外プレイヤー用
7. One doesn't see the situation of other players' discards.
So, when he gets ready, he often disappoints that his wait is few.
I think that the player should look for his(or her) hand and discards by 3 to 7 (at least 4 to 6) of the ratio.