To achieve consistency, the players have to reach an agreement on the game state. However, this opens a door to distributed consensus problems. Let us look at one of them, called the two-generals problem: Two generals have to agree whether to attack a target. They have couriers carrying the messages to and fro, but the delivery of the message is unreliable. Is it possible for them to be sure that they have an agreement on what do? For a further discussion on consensus problems, see Lamport and Lynch

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