this happened in a swiss team event in Iceland. 7th table out of a total of 9.
1♣-p-1♦-p
1NT-X-p-2♥
p-2NT-p-
Up to this point there were no alerts (S wanted to show a good hand with good clubs, his partner thought X was showing majors). Now N asks E about 1♦, getting the response "oh it promises 0-7 points, any # of diamonds".
1♣-p-1♦-p
1NT-x-p-2♥
p-2NT-p-3♦
end
Before coming down as dummy S asks about 1♣. EW say it shows "just an opening hand, could have 0 clubs" so S calls the TD.
The TD decides that S is allowed to change his last call. He bids 3NT, West doubles.
version 1: the play goes like
T1: spade to K
T2-4: diamond to the Q, A of diamonds, small diamond, west discarding a heart.
T5: spade to the A
T6: club to J and A
T7: spade, heart discarded by dummy
T8: diamond to the T
T9: club to the K
T10: club to the T
T11: spade
Declarer claims 9 tricks +550.
EW agreed that they did not alert 1♣ or 1♦ but they claimed that everybody knew what system they were playing and they aren't used to alerting this bid (which hasn't come up before this board). They appealed the ruling that S can take back his pass.
I was south and I can tell you that it was quite obvious that I was not from Iceland because I was only speaking in English. They play 2♣ as both minors (11+ points with at least 8 cards) and 2♦ as majors (same parameters) and they came up several times and they alerted every bid from every sequence that started with 2♣/2♦.
I'm not sure about this but when EW was presenting their case shouldn't I have been asked too? I think they might have told the TD that they pre-alerted this before board 1 (which they did not do).
version 2
the defence goes a little better and declarer goes 2 down, -300. Now S claims that he could have bid 2♣ (more likely than not passed out and making) and be done with the hand but EW says his 3NT bid was ridiculous so he lost all his rights.

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