Rainbow

These conventions apply to any variant with a rainbow (touched by all colors) or dual-color suit.

If a rainbow 2 has not yet been discarded, then it must be 2 Saved in the same way that normal 2's are.
If a rainbow 2, a rainbow 3, or a rainbow 4 are critical, then they can be saved with any color or the respective rank.
Thus, as soon as a rainbow 2, a rainbow 3, or a rainbow 4 become critical, any color clue to a chop card will probably just look like a Save Clue on a critical card.

Free Choice is defined as when a player has two or more options to clue a card and all of the options would only touch the same card(s).
For example, in a no variant game:
- Bob's hand is, from newest to oldest: red 1, blue 4, blue 4, yellow 4, yellow 4
- If Alice wants to give a Play Clue to the red 1, Alice is said to have a Free Choice between red and number 1, since both of those clue types would only touch the red 1.
Since rainbow cards are touched by any color, players will often have a Free Choice on how to clue a rainbow card.
For example, in a rainbow game with 6 suits:
- Bob's hand is, from newest to oldest: rainbow 1, blue 4, yellow 4, green 4, yellow 4
- If Alice wants to give a Play Clue to the rainbow 1, Alice is said to have a Free Choice between red, purple, and number 1, since all of those clue types would only touch the rainbow 1.

When performing a Prompt on a rainbow card, if the cluer chooses a color that only touches rainbow cards and they have a Free Choice to choose the color that matches the color on the clued rainbow card, then they must always choose the color that matches.
For example, in a rainbow game:
- The red 1 is played on the stack.
- Bob has a clued red card in his hand. He does not know the identity of the card.
- Cathy has no clued cards in her hand, and her hand is, from newest to oldest: yellow 2, green 3, rainbow 2, yellow 5, green 4.
- Alice clues red to Cathy, touching the rainbow 2.
- Bob sees that Alice had a Free Choice between blue and red, which would both only touch the rainbow 2, and she chose the color that matches Bob's clued card.
- Bob therefore knows that this is a Free Choice Prompt and plays his slot 2 card as the rainbow 1.

If a player in this situation chooses not choose to match the color, then they must be trying to communicate something extra. This signifies that it is actually a Finesse instead of a Prompt.
Modifying the example above:
- Alice clues blue to Cathy instead, touching the rainbow 2.
- Bob sees that Alice had a Free Choice between blue and red, which would both only touch the rainbow 2, and she chose the color that does not match Bob's clued card.
- Bob therefore knows that this is a Free Choice Finesse and plays his slot 1 card as the rainbow 1.

It is possible to use the Free Choice convention to communicate to a teammate that you want a Finesse instead of a Prompt in order to get them to play an unrelated playable card from their Finesse Position.
Like a normal Bluff, after a Free Choice Bluff, the player who blind-played does not necessarily have the "connecting" card in their hand.