In chess on a torus, one identifies the left and right edges and also the top and bottom edges, as in FIGURE 1a. These identifications really do produce the torus; the left and right edge identification gives a cylinder, and the top and bottom edge identification amounts to connecting up the ends of the cylinder (see Barr [3] or Stillwell [70] for drawings of this construction). Once again, for playing toroidal chess, it is to best to use the regular chessboard and just remember the edge identifications. The origins of toroidal chess are not clear, but it goes back at least as far as P6lya's 1918 paper [57].