Every few days a hand comes along to remind me that I still have a lot to learn. I call the interval between these hands "really annoying". Hopefully, it's getting shorter. I set myself a limit of a few hours to crack it and then I pass it over the experts.
Here's the latest one.
Suddenly, after deciding that the hand that it held was not good enough for a weak 2 in ♠, my partner the ever excitable North robot suddenly upgraded his hand and made a Texas transfer leaving me in an apparently makeable 4♠ contract.
I tried more than 15 times the best I can do is 4♠-1, usually -2.
Every time I play it West leads the ♣6.
fwiw - not much I know, if North had opened a weak 2♠ and South had applied the dreaded rule of 17

minor edits to repair over-zealous spell-checker