Arkady and Boris Strugatsky. The doomed city (№ 3627)

... wins is not the one who knows how to play by all the rules; the winner is the one who is able to give at the right time from all the rules that make the game its own rules, unknown to the enemy, and when you need to abandon them. Who said that your figures are less dangerous, than figures of the opponent? Nonsense, his figures are much more dangerous than enemy pieces. Who said that the king should be protected and to take away from the Shah? Nonsense, there is no such king, which could not be replaced by some knight or even a pawn. Who said the pawn, who in the last rank, becomes a figure? Nonsense, it is sometimes more useful to leave it on foot, let stand on the edge of the abyss as a warning to other pawns...