Balbo's Game: A novel-shaped board with 70 squares. Full armies for each player, minus one pawn. No castling. By G. Balbo (1974).

Circular chess: Played on a circular board consisting of four rings, each of sixteen squares.

Cross chess: Cross-shaped cells, board geometry like hex chess but moves akin to normal chess (e.g. bishops have four directions, not six; queens eight, not twelve). Extra rook, knight, and pawn per side. By George Dekle Sr.

Decimal Chess: Played on a 10×10 board, usually add extra pieces. Some decimal chesses use only standard pieces, but others such as Decimal Falcon-Hunter Chess use fairy pieces.

Decimal Rettah chess: Adding a king, queen and two pawns. Invented by V. R. Parton.

Double Chess: Two full armies per side on a 12×16 board, the first to mate an enemy king wins. Pawns advance up to four steps

Doublewide chess: Two regular chessboards are connected for a 16×8 play surface. Each player plays with two complete sets of chess pieces.[8]

Flying chess: Played on a board of 8×8×2, giving a total of 128 cells. Only certain pieces can move to and from the additional level

Grid chess: The board is overlaid with a grid of lines. For a move to be legal, it must cross at least one of these lines.

Infinite chess: Numerous players and mathematicians have conceived of chess variations played on an unbounded chessboard.

Los Alamos chess (or Anti-Clerical chess): Played on a 6×6 board without bishops. This was the first chess-like game played by a computer program.

Masonic Chess: Every other board rank is indented. Same as chess, with moves adapted to the new brickwork-like board. By George Dekle Sr.

Minichess: A family of variants played with regular chess pieces and standard rules, but on a smaller board.

Polgar reform chess: In his book Reform-Chess (1997), László Polgár proposed several variants played on board of size 5×8, 6×8, 8×6, or 9×6.[11] The initial piece setup is determined by players in the same way as in Benko's Pre-chess. There are special rules for castling depending on the board. Polgar recommended these variants to train creativity and to speed up the game.

Polgar Superstar Chess: Hexagonal variant played on a special star-shaped board. Invented by László Polgár (2002)

Rhombic Chess: Uses a hex-shaped board comprising 72 rhombus cells. Normal set of chess pieces move edgewise or pointwise. Checkmate objective as usual. By Tony Paletta (1980).

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@thisisaweakplayerLOL i too thinking the same thanks for posting the topic

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Thanks for all the suggestions, we are currently working on adding games that are played at the Mind Sports Olympiad.

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