Reportedly played between two Professors of Philosophy ("Justice Good and True" by Heinrich Fraenkel from "Chess Treasury of the Air" edited by Terence Tiller), the question is who won? Or is it a rare case of mutual Checkmate?

Does Black win with 1. ... d5? Or is it mutual Checkmate after 2. cxd6 e.p.?
Professor White played 1. Bg2 and announced Checkmate. Professor Black countered that after 1. ... d5 it is White who is Checkmated, to which Professor White argued that because of 2. cxd6 en passant (with mutual Checkmate!) the pawn was captured on d6 and so never reached d5 protecting its King, 1. ... d5 therefore being an illegal move, played as it was with the King already dead.
You are the arbiter. To whom do you award the game, and why?
1 comment:
Game to Black....
Moves are sequential, not simultaneous, so d5 blocks the check from White, and even white capturing at d6 does not stop the black checkmate, which is what white must legally do !
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