West North East South
- Pass Pass 1♣
Dbl 1♠ Pass 2NT
Pass 4♣ Pass
AT this point North ask for an undo. EW, assuming a misclick, agree as per usual
Pass 3♠ Pass 4♣
Pass 4♦ Pass 4NT
Pass 5♦ Pass 6♣
Pass Pass Pass
When South bid 4♣ over 3♠, EW called the director through private chat to protect against the possibility South was taking advantage of UI.
On the auction without UI of 4♣ taken back, south has forced to slam in a ratty club suit 1) without clubs having ever been supported, 2) with apparent misfit in spades, 3) with "strong" opponent hand behind his, and 4) with his partner showing no real slam interest (if 4♦ is natural, and since no trump fit announced, it would be, right?
North had singleton diamond, four good clubs, heart king, and spade A, and the slam made. The director ruled that South "had a strong hand, and lots of clubs", so had his bid. Slam made. Questions for the forum.
1) Undo;s are allowed for misclicks, but norhts real bid should have been 4♣. Do you think this action alone deserves a sanction?
2) Do you think the takeback of 4♣ provides UI (not illegal per se, but which requires south to justifiy his bidding)?
3) While souoth had his 2NT bid, but do you think with a doubleton spade, and a ratty club suit (AQ-empty), do you think he had enough extra (2NT promised 18-20, he had 18) to make 4♣ the standout bid that everyone would make, and thus legal?
4) If you believe this 4♣ bid is barred because of UI, how do you redress what occurred at the table.

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