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+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.