Borges, Teoria dos Jogos e Sinalização

I remember I once saw a man challenging another to fight, and the other caved in. But he caved in, I think, because of a trick. One was an old hand, he was seventy, and the other was a young and vigorous man, he must have been between twenty-five and thirty. Then the old man, he begged your pardon, he came back with two daggers, and one was a span longer than the other. He said, “Here, choose your weapon.” So he gave the other the chance of choosing the longer weapon, and having an advantage over him; but that also meant that he felt so sure of himself that he could afford that handicap. The other apologized and caved in, of course.

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