This is a generalization of Lord Dunsany's Chess. I designed this as a teaching tool for my son Michael.
 
In this teaching variant, White wins by taking all the black pawns. Stalemate is still a draw, but easy to avoid. Black pawns have the double-move only rank 7 (his second rank).
 
Level 36 is an even game. A beginner should start at level 24, an inexperienced player at level 32.
Level 40 is a challenge for even the most skilled players.
The levels past 40 are impossible to win, unless computer playing strength is reduced.