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H. G. Muller wrote on Tue, Mar 31, 2009 03:56 PM UTC:
If the Bishops are on like-colored squares, it is an immediate draw even before the flag falls, as no checkmate positions exist. Ifthey are on unlike-colored squares it is more tricky. The other rules you quote seem to contradit each other. (Isn't the second one only for blitz Chess?) In theory a checkmate position exists, but only as a helpmate: you must put your King voluntarily in a corner, your Bishop next to it to block its only escape square, and then you can be mated. This definitely does not count as a 'forced win', unless you are already in that position and the opponent can mate you in one move and it is his move. I always thought that at standard time controls forfeiting on time in KBKB* counts as a loss, but perhaps they changed the rules.

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