While you shouldn’t always trust the defenders to deliver accurate distributional information, they will often do so inadvertently, such information often constituting the backbone of many useful play indicators like Vacant Space Theory.
A brisk auction to a decent game against which West led a fourth-best diamond. In with the ace, East shifted to the spade seven, ducked for West to win the ace and play back the ten.
Declarer won the second spade to mop up two rounds of trumps before cashing the last high spade and King of diamonds.
To make it all about the club Jack: with a finesse possible against either defender, could South guess the right way to go to avoid losing a second trick in the suit?
After West’s play of the diamond deuce on the second round, that suit seemed to have started 5-5. Further, East was known to have been dealt two hearts and, judging by West’s lead back of the ten of spades, four cards in that suit.
All to make East’s likeliest distribution 4-2-5-2 and West’s 3-1-5-4. In line with Vacant Space Theory, what information there was seemed to make West a 2-1 favourite to hold the Jack of clubs as his hand had four “vacant spaces” for any particular club to occupy as compared to two for East.
Perversely, South continued by leading a club to the Queen followed by the ten through East for a losing finesse and down one, a result some would say was thoroughly deserved for declarer’s failure to count and/ or follow the odds.