Thanks to Mr. Schmittberger for the quick decision.
I agree that such a position is very unlikely -- presumably it's unusual for a game of Extinction Chess even to last so long -- but it's not inconceivable. If the ruling had been for a draw, then one could imagine a game in which Black had no winning chances, but could force a draw by moving the Bishop to c8, forcing the Pawn to promote or die.
On the other hand, since the capture-promotion has been declared a win for White, it seems that the position as I stated it could arise only after an obvious blunder by Black. But of course the Black piece need not be a Bishop. One could imagine White pushing his last Pawn to the 7th rank, forking Black's last Rook and Knight.
I agree that such a position is very unlikely -- presumably it's unusual for a game of Extinction Chess even to last so long -- but it's not inconceivable. If the ruling had been for a draw, then one could imagine a game in which Black had no winning chances, but could force a draw by moving the Bishop to c8, forcing the Pawn to promote or die.
On the other hand, since the capture-promotion has been declared a win for White, it seems that the position as I stated it could arise only after an obvious blunder by Black. But of course the Black piece need not be a Bishop. One could imagine White pushing his last Pawn to the 7th rank, forking Black's last Rook and Knight.