Ben,
Thanks so much for the quick reply...it
is a diamond finesse in hand 103. But the "lesson" being taught is who to finesse (which is the problem I'm having pounding thru my thick head

)...Playing out that hand (holding on the Ace of spades) all the way until the diamond queen finesse doesn't demonstrate any further holdings other than LHO held two hearts. Both opps played 3 spades, I held three, and dummy 2....so 2 spades are still out, why must they be in LHO as indicated by BM2000, which is the object of the lesson, not to let the hand holding the spades have the lead as they could then defeat the contract.
LHO followed spades three times, clubs three times, diamonds once, and showed void in hearts after two rounds (sluffing a club).
RHO followed spades three times, clubs twice, hearts three times and diamonds once.
As far as I can tell, with four cards held, two spades, one club, two hearts, and three diamonds are not accounted for...and all I can say for sure is that the RHO holds the remaining two hearts.
Your response above makes perfect sense, but I couldn't find anything pointing out how the final two spades would be distributed among the opps...which seems to be the point of the lesson
Rick