I'd immediately (after pulling trump) play a
♠ to the 7 (the 10 if LHO plays the 8.... I'd still be thinking if he played an honour)
This works if
♠ behave and:
1) RHO has the
♦AK, or
2) RHO has the
♦A and is afraid to underlead it, or
3) RHO has the
♦K and is afraid to underlead it, or
4) RHO underleads his
♦ honour and LHO thinks it's a good time to play another
♦, or
5) RHO underleads his
♦ honour and I can successfully guess the
♣ suit on a
♣ switch by LHO
The alternative that occured to me was to lead a
♦ after pulling trump, hoping to sneak this by West or to find RHO with the AK (I'm covering LHO's card if it is neither the A nor K), or to guess the
♣ if/when LHO continues.
I think plan A works as well technically and maximizes the odds of misdefence: if I play a
♦, it's really obvious that I don't have another one.
BTW, the
♣ suit offers intriguing possibilities and I'd both like to know what spot RHO pitched and what spot LHO led if he gets to lead through the Qx next time.
One thing we know, almost for sure, is that RHO did not start with K10x. He either has K10xx (now Kx) or J10xx (now Jx) or an irrelevant holding: one on which we either cannot go right or cannot go wrong.
We may be into mind-games later if LHO leads the 8. Many would succumb to pressure with the J8x and lead the J..to guard against you holding the 7 (as you do). However, an expert defender knows that his partner knows that he holds the J so he would lead the 8, which is the card he'd lead from K8x. If the 8 were led, restricted choice (in an odd way) suggests playing him for K8x on the basis that at least some of the time he'd play the J from J8x even if he is an expert and he'd almost always play the J from J8 if he were anything less. Yet he'd have to play the 8 from K8 in order to have any chance.
Ok, what if LHO pops an honour on the 1st
♠? If we duck, we are assuming both that
♠ behave (so not a singleton honour) and that we can guess the
♣ if he continues
♣. He may, of course, cash the
♣K and try to get 2
♦ winners. If we win, we are hoping that he has QJ tight (we run a bunch if tricks now) or stiff honour: we hook on the way back and lose only 3 minor suit cards.
This is not a restricted choice situation: LHO will often split with QJx. I am going to quit this discussion now due to time constraints.... let me know if I have to deal with it on my suggested line, and I will post my best guess and what passes for reasoning
'one of the great markers of the advance of human kindness is the howls you will hear from the Men of God' Johann Hari