"I think we could improve a lot if we concentrated on some basic themes. .... frequently mis-applying them to bread and butter simple situaitons. Here's a list. By no means exhaustive of things I've observed.
Not only is the normal play right most (if not all) of the time, you're partner will NEVER work it out, and will sometimes make disasterous decisions.
1. When partner bids a suit, lead it. ..it's irritating.....anything in partners suit is good to lead from, especially a singleton, when your trump holding is such that you'd welcome the chance to ruff.
When my partner doesn't lead my suit, he either has an obvious strong alternative, or he is void, and that is what I'll assume.
2. Lead a suit headed by the Ace King (against suit contracts).......just do it, and charge me if it costs us.
3. Second hand low.
4. Third hand high. Do not finesse against partner. .....lucky for us declarer had stiff 9 and not Jack....but if you just play the proper card, we don't have to be "lucky".
5. Third hand bracket. DO finesse against the dummy....ESPECIALLY when the cards are touching....the other day I lead a club....the 10 was in dummy, you had the J9 wrapped around it, and somehow played the Jack...not only did it pitch a trick....I misdefended in the end, because I "knew" you couldn't have the 9.
6. Fourth hand, win the trick if you can....especially if it's with a card you can't win a trick with later.....Every once in a great while, some novice opp of ours will hold Kxx as declarer....the lead will come to the Queen or Jack, he'll hold up, and we'll run the suit down their throat.....
...giving you a free trick that you refused.....
7. .....Think of building a trick in suits when you have some combination of K, Q, Ten by playing the K or Queen first as opposed to finessing the ten first..... You may have nine tricks in NT if a side suit breaks 3-3 before they can run their long suit.....
Sure, there are some exceptions, and really good players learn to recognize them...but we can't be sniffing at them when they aren't there, and that is SUCH a quick path to a ZERO......We lose very little when we fail to find a really advanced play (one of the exceptions) and we tend to lose a GREAT deal when we screw up the simple stuff."

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ing) tr. v. - Any bid made by bridge player with which partner disagrees.