Learning from other peoples mistakes is the second best way to proceed. The best is to make the mistakes yourself. The very best, of course, is to not make the mistake by thinking a bit harder than you are used to. Here is an example. The bidding is Acol. A reverse bid of 2♠ would be game forcing. I did not consider myself strong enough for that. So, North finished the auction in 3NT. With 2/1, it looks easier if you follow the usual advice to bid shape. Opener simply rebids 2♠ after the game forcing, not promising extra values, and you can land in 4♠. The robot at North, however, will start a slam try with 3♠, and later an exclusive blackwood after your Splinter bid in diamonds. You are already too high at this point. That happened to most other players. The opponents cashed the two spades and I kept the ♠QJ, a point to be discussed later. They continued with a diamond, and I am faced with the problem of treating the clubs. Clearly I needed to duck one round and play low from the tab...