HalfPawn: http://brainking.com/en/GameRules?tp=74
Grand Chess is on this site. It is played on a 10 × 10 board. It has its own discussion board on this site too. It uses the same pieces as Bird's, Capablanca, Gothic, and Embassy Chess. Check the rules page out. The pieces are set up as in Embassy Chess except that the Rooks are back one row from the rest of the pieces. This game has no castling and the Pawns can promote on the 8, 9, or 10th row and can only promote to a piece that your opponent has captured from you. With the Rooks being able to move from the start of the game it has a different play to it than the other large games using these pieces. With all the other pieces up on the second and third rows it makes the play seem like a 10 × 8. It's a pretty good game. The back rows aren't too important later in the game. Early in the game they come handy. Besides positioning your Rooks, you can sometimes use the Cardinal to line it with a Bishop. Your King has space to run and he needs it. I'm fairly sure there are no quick checkmates in this game as there are in the others.
Fencer has added a link in the rules page to the inventor's page.