Chess on a really big board is a large chess variant invented by Ralph Betza around 1996.[1] It is played on a 16×16 chessboard with 16 pieces (on the back rank) and 16 pawns (on the second rank) per player. Since such a board can be constructed by pushing together four standard 8×8 boards, Betza also gave this variant the alternative names of four-board chess[1] or chess on four boards.[2]