Chess by the official FIDE rules, exactly as Dineri plays it, with no clock for now.
The game
Two players, White and Black, on an 8×8 board. The colours are drawn at random each game. White moves first; then turns alternate.
Checkmate the other king and you win. You may also resign at any time, and lose.
How the pieces move
King: one square in any direction.
Queen: any distance along ranks, files and diagonals. Rook: along ranks and files. Bishop: along diagonals. None of them can jump over pieces.
Knight: in an L (two squares one way, one square to the side), jumping over anything in between.
Pawn: one square forward to an empty square, or two from its starting rank if both are empty; it captures one square diagonally forward.
A move may never leave your own king in check.
Special moves
Promotion: a pawn reaching the last rank becomes a queen, rook, bishop or knight, as you choose.
En passant: a pawn that has just moved two squares may be taken, on the very next move only, by an enemy pawn as if it had moved one.
Castling: with a king and rook that have never moved and nothing between them, the king moves two squares toward the rook, which jumps over it. Not allowed while in check, nor through or onto an attacked square.
The end
Checkmate: the player to move is in check and has no legal move. They lose.
Stalemate: the player to move is not in check and has no legal move. A draw.
The same position for the third time (same player to move, same castling and en passant rights): a draw, at once.
Fifty moves by each player with no capture and no pawn move: a draw, at once.
Neither side can ever checkmate (king against king, king and bishop or knight against king, bishops all on one colour): a draw, at once.
A draw by agreement: offer it, and if your opponent accepts, it's a draw. You can offer again once they've moved twice.