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Fifth rank of course is en passant rank too. Theoretically possible for a Pawn situated on f5 are f5-f6, f5-g6, f5-h6, f5-e6, f5-d6. 'g6' and 'e6' are by capture either standard or en passant, and 'g6' and 'd6' are non-capture. In a variation, expand the added ability to all the Pawns. Same number five conceivable arrival squares, instead of ordinary three, from any of the four inner files c, d, e, f when on the fifth rank. Then 'b5' and 'g5' have four -- Valiant Chess standard form. I have suggested eliminating Draws by two-step tiebreak within actual over-the-board play before or upon completion of a game: first point value remaining, second which King controls e4, e5, d4 and d5. No more Draws, never a half-point. So, combine Win/Loss only with the Winther Pawn Knight-drive alternative move here applicable only fifth rank and there should be no need ever to depart from the sixty-four of the ancestors. Winther's modest form only permits the four Knight Pawns the drive; still another might allow all eight of a, b, g, and h Pawns the privilege. In standard Valiant Chess, does the Knight Pawn get the drive if arriving at b5 by way of b2-a3-b4-b5? Surely so. [ I did not see Winther already includes exactly the four a-b-g-h intuitively correct also as variation; but probably all Pawns are best aesthetically, there may need be some other offset or qualification. ]