Quote:
Frankly, I'd never even think about a squeeze or a trump coup (if that's on) at the table and just play AH, heart ruff, JS, club ruff, trumps.
Of course, this is your main line. LHO probably "never" would lead from Qx of clubs, and even if they did, maybe the ST will be on your right.
So, you have a great line available, close to 100 %. What are the pitfalls? As you mentioned 5-0 spades is the issue. If LHO has 5 spades to the ten you are dead (unless you take a first round finesse which obv you would never do). What if RHO has 5 spades to the ten? You will be able to finesse him out of it on the SECOND round, after LHO has shown out, but you need that little trump in dummy to do it.
All this means is that you cash the SJ before doing anything. Most of the time, they both follow, and you ruff a heart etc (your main line). Sometimes RHO shows out and you are just down. But, sometimes LHO will show out. Now you can't ruff your heart because you have to hook the spade.
This means your play usually gains nothing, but in the case of RHO having 5 spades you are no longer down perforce (whereas you would be if you had ruffed a heart immediately). The SJ is just a discovery play.
Once you get the bad news, you have to play on. If diamonds are 2-2 you are still cold obviously. What about if they don't split? You need to play for a squeeze in that case.
What is the best squeeze to play for? The one you gave is a double squeeze and is a strong line. For this line to work, you need RHO to guard diamonds, and LHO to guard clubs. The problem with this is you have to take into account LHO having a spade void! When he has a spade void, he is extremely extremely unlikely to also have a stiff diamond. That would give him 12 round cards. It's possible, but far more likely is LHO being the one with 3 diamonds.
If LHO has 3 diamonds you have a simple squeeze, running your major suit winners and squeezing him. That is the percentage play given that LHO has 0 spades and RHO has 5.
So the key points are
1) Play the SJ to see if RHO has 5 spades.
2) Once that happens, figure out what squeezes are possible, and choose the best one.