The alerts I made up, actually I am not fully sure who ended up bidding 6 spades. But the fact is, they messed up the bidding ending in a moysan fit instead of a 10 card one, but after Robson decided not to lead what Forrester asked for, leading a heart instead, the contract cannot fail.
Forced to ruff a club in hand, declarer can only play for spades 3-3 with the queen onside.
So the lead was♥7 and Nunes won in dummy unblocking the 10, he needs a miracle in trumps and ruff a club in hand for the 12th, so headvanced ♣A and lead ♥Q.
Robson though for a while about ruffing this trick wich would certyainly be a strong defence, giving nunes a losing position if he returns a diamond. But in the end he pitched and Forrester won.
Now Forrester though for long as well and returned ♦J. Its hard to know what Info Nunes had about what opponents know about the bidding, since they obviously messed up and they might not know about the moysan fit.
But after winning ♦Q and being no longer forced to ruff a club in hand thanks to the extra trick, Nunes took the greek gift and played spades the wrong way losing the ♠Q and the championship.