The bidding ain't a piece of beauty, I though jumping to 4 spades I could create some dilema on south who would not know to double me when north had 3 spade tricks, and perhaps he would bid 5 hearts and be catched by partner. In the end what I did was to oclude club suit, 6 clubs can be defeated, but made on the only table that reached it. Perhaps if I jsut bid 2 or 3 spades I would be able to bid clubs later.
Anyway, declarer led ♠4 and dummy called for small, and I also played my lowest one, since if anything I want to signal for clubs. Declarer decided to discard ♣Q on this trick.
I don't recall ever winning a 4 on the first trick, let alone a singleton 4 in a suit contract!. I recall several times winning a 5, mostly with someone being void against 1NT or 3NT, but somehow the 4 just never happened to me.
After thinking all of this, finally my partner stopped looking focus and looked away from the table, so I realiced she didn't know it was her turn to play. If winning a singleton 4 against a suit contract at trick 1 was not something unique, partner secured to make this hand memorable when she led ♥2 at trick 2...