Q Quad-Square Chess . Chess on a board of 38 squares, of which six have size two by two. R Romanchenko's chess . A board with a kind of Z-form. 8x8 Reversible Stairs-Chess .
Chessboard looks like stairs.
S Shatra . Old game from the Altai from Russia, on special shaped board with draughts-like capture. Snake Chess . A variant played on a 2 by 12 cyclindrical board. By Sergey Sirotkin.