This is a Tx4 match. All the players here are advanced.
The only bid that was alerted during he auction was the 2H (The bidders play 2/1 and the alert for the 2H was alerted as GF)
No questions were asked when the bidding finished and South leads the ♠A, his partner dropping the ♠8.
Again no questions were asked.
South continue a spade and declarer makes his contract of 5♥.
The TD was called and leader explains his problem as follows:
He was under the impression that the 4♠ was bid as support for ♠'s while it was used as Keycard for ♥'s. Therefore he lead the ♠A. If he had known that it was actually Keycard for ♥'s, he would not have lead the ♠A in the first instance. His partner explained that dropping the ♠8 was a suit preference for switching to ♣'s and was not intended for count.
What should the ruling be here?
Should the score be changed to 5♥-1?
Is it necessary for declarer and partner to explain their bidding from the 4-level upwards if no questions are asked by the defenders?
Regards
Note: I corrected the West/North hands West Jxx and North AKxxx
Sry about this, but I think it does not make any difference to the questions.