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deliver checkmate on or before Black's second move.If White can leave Black with no option but to play Bxg2, the problem is solved.
* White might try moving the bishop, but this is no good, as 1. Bxh1 ruins the selfmate, while any other bishop move allows 1...Bg2, allowing Black to later move his bishop off the a8-h1 diagonal;
* Moving the knight allows 1... Kg6, after which Black can stop selfmate by only moving the king;
* 1.e6? allows 1...exf6 and later 2...f5, freeing the king;
* 1.f7? or 1.fxe7? allows 1...Kxg7 and the

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