I thought these were pretty interesting, then you guys come right away and solve them all and it makes me feel really dumb
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On the first one Spades were 3-3 with the club king on your right.
On the second one partner had AKJTxxx Ax Axxx - so you can always make 12 tricks on careful play, though you have to be a bit careful since the 2N bidder is 2-6-5-0 and its possible partner might get the ace of clubs ruffed or something. Thought this was tricky tbh, partner has shown a very good single suiter, and I have two trumps and A a K and a shortage, otoh, a trump lead is expected so the shortage might not be that useful, and bad breaks will surely make it impossible to set up the club suit. I passed and felt pretty clear at the table, but maybe I dont have a lot of experience with how strong partner should be for this auction.
On the third one declarer had AKQJxx xx Jxx xx so if you don't find an immediate club switch you expose partner to a partial elimination since he has KQJT of clubs.
. Felt like the third one was pretty hard, opponents would have been playing 2S = any min which is normal in UK 2/1 players I think so 2S did not promise 6 and could ahve been 5(332) or even 5-4 with 4 diamonds if a minimum. An immediate club will make you look like a total numpty if declarer had KQJxx xxx Qxx Kx or similar. I didnt really appreciate on how many layouts a club was necessary though, so on balance I think its probably right to play a club.
The physics is theoretical, but the fun is real. - Sheldon Cooper