I failed to solve the following defence vs a partscore. The auction:
(1C) - 1H - (X) - pass;
(1S) - pass - (pass) - X;
(pass) - 2C - (2S) all pass
(1C) = 17+
1H = natural, not trash
(X) = any 0-4
I balanced with double, but sold out to 2S. Partner led the 8 of D, playing Scheider-Rusinow (1 or 3 higher).
I won the ace and returned the 3 for partner to ruff. Partner shot back the 2 of C to my ace and declarer's T. How to continue?
Well, as I knew declarer had only 5 trumps (possibly 4) and another high diamond, I continued diamonds for partner to ruff without really analysing the deal. Auto-pilot. So wrong!
There wasn't really any need to analyse the deal; just follow the directions. Freddan's low club meant he didn't want another ruff. So, shift to hearts.
Now declarer can't reach dummy to finesse in trumps without me getting the over-ruff for the setting trick. If I decided that partner may have led the wrong club and analysed the deal, this would also be the indicated shift. The fact that no other pair beat the contract either is a poor consolation (and certainly no excuse). Competing to 3C would have been even better.
Follow partner's advice. Or use your brain. Hopefully one of them steers you in the right direction...