2 The board is divided into 16 square cells of size 2x2.
3 A piece must change cell at each move.
6 The board is decomposed into 16 little 2x2 squares, starting from
7 a1,b1,a2,b2 until g7,h7,g8,h8. When a piece moves, it must cross at least
8 one boundary: it cannot remain in the same cell.
9 So, pieces in the same cell don't attack each other.
11 figure.diagram-container
13 | fen:1r1kr3/3nbbQ1/6p1/4p3/1qp1p3/PR1P1NPP/4nP2/2B1KR1B:
15 The white king under check cannot take the knight,
16 and Rxb4 is not possible.
19 Pawns are Berolina pawns: they move one square diagonally forward and
20 capture one square orthogonally forward.
25 | This variant is mentioned in
26 a(href="https://www.jsbeasley.co.uk/encyc.htm")
27 | The Classified Encyclopedia of Chess Variants