p.boxed
| Pawns start on the 7th rank. Move a knight to promote them.
-h3 Divergences
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-p No castle, no en-passant capture.
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p.
...Only the initial position changes, but this makes a huge difference.
In particular, castling would be rather pointless so it's disabled here.
| fen:RBN1BRRQ/PPPPPPP/8/4n3/8/8/Nppppppp/brkbqr1n:
figcaption After 1.Nc6 Nf3 2.Nb4 Ne5 (covers d3 but not a2) 3.Nxa2#
+p Note: in the standard initial position, kings and knights are not neighbors.
+
h3 Source
p