Capablanca Chess, proposed by former World Champion Jose Raul Capablanca, introduces a larger board and additional pieces to create a more complex and strategic game.

The 'Drop Rule' in Crazyhouse Chess allows players to drop captured pieces onto any empty square on the board, creating unexpected tactical possibilities and comebacks.

Courier Chess, also known as 'Courier's Game' or 'Knight Bishop', adds a versatile 'courier' piece that combines the movement patterns of a knight and a bishop.

In Atomic Chess, capturing an opponent's piece results in both pieces being removed from the board, creating a dynamic and explosive gameplay experience.

Hexagonal Chess, also known as 'HexaChess' or 'Honeycomb Chess', introduces a hexagonal board and unique movement rules that challenge traditional chess strategies.

In Chess960, the starting positions of the pieces are randomly generated by a computer, ensuring that each game begins with a unique and unpredictable setup.

Checkers Chess, also known as 'Checkers on a Chessboard', merges the rules of chess and checkers, creating a hybrid game with distinct strategic possibilities.

In King of the Hill Chess, the goal is to occupy and control the central square of the board, rather than checkmating the opponent's king.

Nightrider Chess introduces the 'nightrider' piece, which can move in an L-shape, adding an exciting new dimension to the game's strategy.

In Three-Check Chess, a player must deliver three consecutive checks to their opponent's king in order to win the game.

Suicide Chess, also known as 'Give Away Chess', requires players to capture their own pieces in order to gain points and eventually win the game.

In Chess with Two Kings, each player controls two kings, adding an extra layer of complexity and strategic possibilities to the game.

Fog of War Chess introduces a 'fog of war' element, where players have limited visibility of the board, creating a more challenging and unpredictable gameplay experience.

Bughouse Chess is a team variant of chess played by two teams of two players, where captured pieces can be dropped onto the board by teammates.

Exchange Chess allows players to exchange their own pieces for captured pieces, adding a dynamic element to the game's strategy and tactics.