> Reducing the set of options works all the way down to a d2, which is equivalent to flipping a coin. I have seen this framed as "evens or odds": instead of as

> Reducing the set of options works all the way down to a d2, which is equivalent to flipping a coin. I have seen this framed as "evens or odds": instead of asking "heads or tails", you ask "evens or odds". Each person reveals either one or two fingers, and the caller wins if the sum of fingers is in the class of numbers they called. It's like rock-paper-scissors but it takes a deterministic amount of time (one round) whereas RPS can take arbitrarily long if the participants are deep in each others' meta.