No.1774 (YM&HG)

Horizontal Cylinder: Pieces move as if the board was a cylinder, with a8-h8 joined to a1-h1. On it, a Rook could move c4-c3-c2-c1-c8-c7…, and could return to c4 to complete a circuit, while a Bishop could move c4-d3-e2-f1-g8-h7 (but no further). The term ‘horizontal’ indicates the edges of the board that are considered to be joined, but it is the vertical movement of pieces that is actually affected. Pawns have no clear promotion rank, and may move indefinitely rather than promoting, though their starting and promotion ranks may be defined. In the normal game-array position both Kings are simultaneously in check.