“…Hardin and Taylor showed, in , that there is a signaling predictor if and only if there is a Lenstra predictor (cf. [3, Theorem 3.3.2]). Theorem With an arbitrary set A of agents and the set of hat colors, the following conditions are equivalent: - (1)The visibility graph V is complete, and in the puzzle of one‐in‐advance protocol, there is a predictor under which all agents but the signaler guess correctly.
- (2)In the puzzle of simultaneous declaration, there is a predictor under which all agents guess correctly or all agents guess incorrectly.
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