Looks like it's about chess
The picture at
http://www.uncaptheride.com/all4naught.html
is a diagram of the old-style chessboard notation. These is is the notation that you used to use, in the days before the more modern e5, e6, etc notation came to be used. So e4c6 would translate as moving the piece on e4 to c6. Interestingly enough, this is a move that only a knight can make, which links into the note with Petroff/Knight scrawled on it in the www.august06.com picture.
Curiouser and Curiouser
The picture at
http://www.uncaptheride.com/all4naught.html
is a diagram of the old-style chessboard notation. These is is the notation that you used to use, in the days before the more modern e5, e6, etc notation came to be used. So e4c6 would translate as moving the piece on e4 to c6. Interestingly enough, this is a move that only a knight can make, which links into the note with Petroff/Knight scrawled on it in the www.august06.com picture.
Curiouser and Curiouser