Grand chess

Grand chess is a large-board chess variant invented by Dutch games designer Christian Freeling in 1984. It is played on a 10×10 board, with each side having two additional pawns and two new pieces: the "marshal" and the "cardinal".
A superficial similarity exists between grand chess and an early version of the historic chess variant Capablanca chess because the same pieces and game board are used. But differences in start position, rules governing pawn moves and promotion, and castling make them significantly different games.
A series of Grand Chess Cyber World Championship matches was sponsored by the Dutch game site Mindsports. Past title holders included R. Wayne Schmittberger (1998, 1999) and John Vehre (2001). Grand chess tournaments were held annually beginning in 1998 by the (now defunct) correspondence game club NOST.
Christian Freeling considers Grand Chess to be one of his six most important games, along with Dameo, Emergo, Storisende, Sygo, and Symple.
Rules.
The pieces are placed on the players' first and second ranks, respectively, with the rooks alone on the players' first ranks. The pawns are placed on the players' third ranks. Since the rooks are not blocked as much by the other pieces as in standard chess, it is easier for them to activate earlier in the game. 
A pawn that reaches a player's eighth or ninth ranks can elect to either promote or remain a pawn, but it "must" promote upon reaching the tenth rank. Unlike standard chess, a pawn may be promoted only to a captured piece of the same colour. (So, it is impossible for either side to own two queens, or two marshals, or three rooks, etc.) If, and for as long as, no captured piece is available to promote to, a pawn on a player's ninth rank must stay on the ninth rank, but it can still give check.
As in standard chess: pawns can move one or two squares on their first move; pawns can capture "en passant"; checkmate is a win; stalemate is a draw. There is no castling in grand chess.
Play examples.
Vehre vs. Schmittberger, 2001.
Played between John Vehre and R. Wayne Schmittberger at the 2001 Grand Chess Cyber Championship Final:
Fool's mate.
1.Cf4 Qd10 2.Ce6 Qf10 3.Cxc8
Strategy.
H. G. Muller suggested the following estimated piece values: