However, my team finally decided there was no damage, so the ruling was never sought. But the principle seemed interesting.
Because of the lack of damage there is no point me giving you the hands. So here is the situation.
The Multi showed a weak two in either major or a 4441 17-24 hand. 4♦ was not alerted, per EBU rules. It "asks for the major".
Before the opening lead, South asked "What's the range?". West replied "Six to ten".
During the play, South was on lead, and declarer had already shown eight points. Knowing therefore that his partner had the spade ace, he switched to the spade king from Kx.
Unfortunately this was into AQ. Opener had a 4=1=4=4 17 count.
The defence suggested that the response of "Six to ten" without mentioning th possibility of a 4441 17 count was MI. They pointed out that declarer, looking at 17 points, should definitely have corrected it.
Suppose the spade switch had let the contract through. Are there grounds for adjustment?