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