1.As declarer, failure to draw trumps immediately, when you have so
many winners in the other suits.
2. As a defender, leading an unsupported Ace and making the King and
Queen good for declarer without declarer doing any work for himself
3. Ruffing just for the hell of it without getting extra tricks- generally
speaking ruffing in the Long Hand where you have already counted your tricks as
trumps naturally
4. Drawing trumps when dummy has a shortage and you need to do some
ruffing first while there are still three trumps in the dummy.
5. Cashing the controlling cards in the opposition's suit. They lead a
suit and you cash your other controlling card in that suit
6. Forgetting to Open 1NT and then having a rebid problem next time around
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