"Vimes had never got on with any game much more complex than darts. Chess in particular had always annoyed him. It was the dumb way the pawns went off and slaughtered their fellow pawns while the kings lounged about doing nothing that always got to him; if only the pawns united, maybe talked the rooks round, the whole board could've been a republic in a dozen moves."
Not true, this is clearly an execution of a foreign adversary not a revolution seeing as the king is white while the rest of them are black. The answer is more specifically imperialism