2 | Pawns start on the 7th rank. Move a knight to promote them.
4 Diagram: ... threatens Nc5-Nd3# and allow 2.b8=Q
6 figure.diagram-container
9 figcaption Standard initial position after 1.Na6
14 li Chessboard: standard.
15 li Material: standard.
16 li Non-capturing moves: standard.
17 li Special moves: no castling (and no en-passant).
18 li Captures: standard.
19 li End of game: standard.
22 ...(Almost) Only the initial position changes, but this is a very big change.
23 In particular, castling would be rather pointless so it's disabled here.
24 En-passant captures are impossible because all pawns already reached 7th rank.
26 h3 Note on initial position
29 Since truly random start can allow un-defendable mate in 3 with a knight,
30 the kings touch at least one knight in the initial position.
31 This allows to move free out of potential check from the very beginning.
35 figure.diagram-container
37 | fen:r7/2n5/1q6/5k2/8/8/K7/8:
39 The king cannot take on a8 because it's guarded by the knight: it's checkmate
45 a(href="https://www.chessvariants.com/diffsetup.dir/upside.html") Upside down chess
46 | page on chessvariants.com.