Herlock Sholmes: It doesn't make sense to have a double cube in a game with perfect knowledge, like in chess. With chess, if the rating difference is high enough, I will have an expected chance of not losing of say 70%. That means, I'd double on move 1. In each and every game of the multigame match.

And then there's the matter of draws. Suppose you have two players, playing 2-point match. One player wins the first game, leading 1-0. In the second game, all there's left on the board are two kings and two bishops - one bishop each, of different colour. The person trailing offers a draw. The person leading refuses the draw, doubles instead. Now what?