off-chain transactions applied to chess or go or tic-tac-toe

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a _spend_ transaction is a transaction that takes money from one person, and gives that money (minus a fee) to another.
We can secure an entire game of chess with a single spend transaction.

Alice and Bob put money into the pot, which is a 2x2 address that requires both of their signatures to spend from.

Each off-chain transaction in the chess game has the potential to spend all the money from the shared address. If someone wins the game then the final off-chain transaction can be broadcast to become an on-chain transaction. It would give money to the winner.

Usually, when the game ends, the computers do a final handshake producing a spend transaction that gives the money to the winner. This smaller transaction has a smaller fee.