Swiss Pairs:
1♣ = strong club, alerted
1NT = diamonds and spades, alerted
West looked shocked at the explanation (she had misbid). The TD was called, he explained the consequences of unauthorized information to East, and the auction proceeded as shown.
♦9 was led to Q and K.
Declarer led a spade to the ace and finessed the jack, losing to East's queen.
East cashed ♣A and continued the suit when partner encouraged.
Result: 3NT(N)-2, NS -200
North-South felt they had been talked out of their 4♠ contract. North also argued strongly that East's decision to switch to clubs was not permitted because of the unauthorized information, and that continuing with partner's suits is a logical alternative.
Do you think he has any claim for an adjusted score?