Cathy's hand is, from newest to oldest: red 2, yellow 4, green 1, blue 3
Cathy's green 1 was clued earlier with a green clue and is globally known as green 1.
Donald's hand is, from newest to oldest: red 2, purple 4, green 4, blue 2
Which clues are available to Alice?
Which clue is the best to give?
From the perspective of the player receiving the best clue, what is the note that they would write? (Be specific and include the full evolution of the note.)
Alice has the following clues available:
She can 2 Save the blue 2. This would be a 2-for-1, but does not get any cards to play.
She can give a Play Clue to Bob's red 1 (with either red or 1). This would be a 1-for-1.
She can give a Play Clue to Cathy's red 2 (with either red or 1). This would cause a Finesse and be a 2-for-1.
She can give a Play Clue to Donald's red 2 with red. This would cause a Finesse and be a 2-for-1.
However, since both red 2's are on Finesse Position, if Alice initiates a Finesse with a red clue, both Cathy and Donald will mark their red card as possibly the red 3, leading to an Ambiguous Finesse.
Since Cathy already has a card to play and Donald has an important card on chop, the best move for Alice is to perform the Finesse on Donald's red 2. This is safe because of Urgency Principle:
Immediately after Alice's clue, Donald writes a note of "r1, r2 if r1 f, r3 if r2 f" on his red card.
Bob knows that he is promised a red 1, so he successfully blind-plays the red 1 from Finesse Position.
Donald updates his note from "r1, r2 if r1 f, r3 if r2 f" to "r2, r3 if r2 f".
Cathy plays her green 1.
Donald updates his note from "r2, r3 if r2 f" to "r2".