Neutron was invented by Robert Kraus in the early 70:s, and published in an issue of the Games & Puzzles magazine.
It is a simple (and solved) game, but even so, the easy rules and tug-of-war over the common neutral unit makes for interesting play!
Chessicals also implements the Paper Neutron variant that Walter Joris describes in 100 Strategic Games for Pen & Paper.
In this variant - presumably as a concession to having the players constantly redraw the board state - Joris made the board smaller and added a second neutron, which makes for a very quick and vicious game!
If you enjoy Neutron, also check out Neutreeko, which is a fusion of this and Teeko!
External links: