Match 6, board 19. We were vulnerable against not and I held this interesting hand as East:
♠ 864
♥ AKQ109432
♦ 53
♣ --
The bidding proceeded:
South West North East Pass 1♣ Pass 1♦* 1♠ 2♦ 3♠ ?As we are playing transfer responses to 1♣, the 1♦ call showed 4+ hearts, like a 1♥ response in standard methods. Partner's 2♦ call, being a normal reverse, showed extra values.
I thought a bit about my rebid. Slam seems possible but there's no good way to explore for it. If I just bid 4♥ it seems likely the opponents will compete to 4♠; there's no way I want to defend that so I'll be obliged to bid 5♥.
Therefore why not bid 5♥ right away? In addition to reaching the same likely level, it tells partner that I have slam interest. It's a "free" slam try, i.e. without the normal added risk.
Partner elected to pass and put down this dummy:
♠ 3
♥ 5
♦ AK1064
♣ AQ10963
The defense began with a spade to North's ace and a trump return, so 11 tricks was the limit. It was a push board.