Matchpoints with you as the best pair in a poor field, needing to be in the top 3 out of maybe 8 pairs in a 9 table field to qualify for the next stage of a national competition (not every pair playing was attempting to Q). First board of the evening.
We don't play support doubles, but (takeout) double and then removing 3♣ to 3♥ strongly suggests 3-6 in the majors. We also don't need the world for a 3♥ rebid (this hand would qualify as 7 playing tricks, 2N would be GF artificial so 3♥ is limited), but N decided not to as he held 3 spades. S looked at the quality of his spades and decided not to bid 3♠ over 3♥.
This scored us 0/16 with spades 3-2 and K♣ onside so you can't go wrong. In fact even with K♣ wrong, you are still gin in 4♥ with spades 3-2, as you can establish the spades if they play 2 rounds (duck the first), and concede a club and discard a spade if they don't.