Modern chess is a chess variant

Chess variant

A chess variant is a game related to, derived from or inspired by chess. The difference from chess might include one or more of the following:...

 played on a 9x9 board. The game was invented by Gabriel Vicente Maura in 1968.

Besides the usual set of chess piece

Chess piece

Chess pieces or chessmen are the pieces deployed on a chessboard to play the game of chess. The pieces vary in abilities, giving them different values in the game...

s, each player has an additional piece with a corresponding pawn:

• 
  a Prime Minister
  Fairy chess piece
  A fairy chess piece or unorthodox chess piece is a piece analogous to a chess piece. It is not used in conventional chess, but is used in certain chess variants and some chess problems...
  
   that moves as both a bishop
  Bishop (chess)
  A bishop is a piece in the board game of chess. Each player begins the game with two bishops. One starts between the king's knight and the king, the other between the queen's knight and the queen...
  
   and a knight
  Knight (chess)
  The knight is a piece in the game of chess, representing a knight . It is normally represented by a horse's head and neck. Each player starts with two knights, which begin on the row closest to the player, one square from the corner...
  
  .

Otherwise, the standard rules of chess still apply, with the objective being to checkmate the opponent's king. The king piece must be moved out of check when it is placed in check. If escape is not possible, the game is lost. A player still may resign at any point in the game, and en passant

En passant

En passant is a move in the board game of chess . It is a special pawn capture which can occur immediately after a player moves a pawn two squares forward from its starting position, and an enemy pawn could have captured it had it moved only one square forward...

is legal.

External links

• Modern chess by Hans Bodlaender