The rules of Chomp are simple. Players alternate turns, on each turn removing a square, as well as all those that are above or the the right of it (in other words, all squares with both coordinates ≥ it). The goal is to avoid having to eat the poison square (the one with the skull on it).

On Manifold Plays Chomp, Manifolders are playing against a computer with optimal play. Manifold's moves are chosen as follows: For each move, I take the top three options at close and make a market asking whether Manifold will win, conditional on each option being chosen. Whichever option has the highest average probability is the one that gets chosen.

The computers' last move was (1, 4), leaving the current state of the board as: