[JLOGIC]

I know I personally sometimes make a "routine" play and then later in the hand freak out that my play cost a trick/contract if declarer has some possible hand. Most of the time they don't have it. I'm sure I make even more of these that I don't even realize when they don't end up costing.

There was a hand in the first pair game where I played carelessly and did not cater to RHO having 1-7-1-4 with a specific holding like the CK or something, after he bid 1H (1S) 1N (X) P. I had an easy endplay on LHO and was stripping out the hand in some order, was going to cash my stiff CA, and put them in, etc. I ruffed from dummy first before cashing the CA as I "knew" rho did not have 7 hearts, and I got overruffed, and they could exit a club. This error would probably cost like .01 % of the time, but since it cost, of course I realized it. There must be things like this all the time though that don't cost.