Alice clues number 3 to Bob, which touches one card on slot 4. It has negative red and green on it.
Bob writes a card note with the identity of the card.
What card note does Bob write?
What action should Bob perform?
Bob writes a note of "y3, p3".
Bob knows that this must be a Play Clue on his 3, since it is not on chop. Since there are no 2's played, the 3 is not directly playable. Normally, this would look like a Reverse Finesse on Cathy's green 2, but since Bob's 3 has negative green, that is impossible.
Thus, this must be a Self-Finesse and Bob must have the 2 to make his 3 playable.
Bob does not know exactly which 3 is playable until he plays his Finesse Position.
Bob needs to blind-play his Finesse Position immediately to demonstrate that he (and not Cathy) has the connecting 2.
Cathy's chop is trash and does not need saving.
After playing the 2, Bob should mark his 3 with the same color as the 2 that was played.