Note 10 — Chapter XVI
Reading edition
Tri-chess: a highly involved game of tri-dimensional chess played on a series of eight superimposed glassine boards. Pieces move not only horizontally, as in the ancient Persian game, but vertically as well. Two additional types of pieces are used in conjunction with the traditional "pawn, knight, bishop," et al. ... the "pilot," which may move in any direction horizontally or vertically until opposed by another piece, and the "ranger," which may move five vertical spaces and three horizontal, or vice versa, disregarding occupants of those squares.—Ed.