the contract is 5 spades by north, my partner has already made 10 tricks when this position arisies:
My partner is in hand and plays ♣3 from hand and plays the 9 from dummy, LHO wins and returns last club.
At this point my partner asks for undo (why for?), and plays ♣Q wich was the card he probably intended to play to assure the contract. Opponents accept (It doesn't matter, why???).
RHO then says: undo after seeing the next card is unaceptable. And he left the table!, LOL.
The other was a bit frustrating at the start, luckilly I just laughed in the end.
Team match, we are getting slaughtered by opponents playing almost perfect.
3♣ by West, N-S had just cashed their 4th trick.
After a long tank, I realiced that the contract was almost unbeatable, only chance was that I played a spade at this point and partner pitches his last heart before declarer can enjoy dummy's ♥Q, declarer would discard his last diamond instead, but then on the way back to hand I would ruff with ♣J hopefully promoting partner's ♣9.
All very good but not today. To my surprise, when I played the spade, LHO ruffed with ♣9!, when LHO saw my partner discarding ♥6 instead of a lame overruff, he realiced what he had done and asked for undo.
I must admit, it took me a bit to accept it, but in the end I just laughed and clicked YES. Now I see the full hand I wonder how can someone missclick on the middle club LOL.
The only surprising thing is that the opponent was a golden star, and not from a third world country preciselly. You can never know with this game!

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