I was West. When I heard partner' response of 2♣ to my 1♠ opening, showing 10+ HCPs and a biddable ♣ suit, I knew we must have game. When I showed my second suit by bidding 2♥, partner jumped straight to 4♥, FAST ARRIVAL, showing an opening value in support of ♥, my only problem was to check for Aces. Therefore, when I heard the response of 5♦ to my Blackwood 4NT, showing 1 ace, I went straight to 6♥.
Well, I thought the above should have been a routine bidding sequence. But to my surprise, there were 16 tables, but only 2 reached 6♥. We were second top, since we had to yield a trick to the ♦A at the very opening lead!
As the cards lie, without a ♦ opening lead, we can make 13 tricks. The top pair had such luck to make 13 tricks thanks to a ♣ opening lead!!!
I was curious to see how such opening lead could have been made. And, to my second surprise, their bidding sequence was even more of a FAST ARRIVAL: they did not give their opponents a chance to interfere by the following.
My third surprise is East's response of 3NT, and my fourth surprise is West's straight jump to 6♥.
For your information, there were 7 other 4♥ contracts (2 making 7, 4 making 6, and 1 making 4), 3 3NT contracts (2 making 4, 1 set by down 2), and 1 6NTx (down 2), 1 3♠ contract (making 6), 2 3♥ contracts (1 making 5, 1 making 4).