A browser duel in the style of Counter-Strike 1.6: you push down a corridor against an AWP sniper whose peeks, counter-strafes and shots are picked by Jev.
Vignesh Shanmugam, a long-time CS player, built it to see whether a decision model could beat a tuned CS bot; matches are best of 20. Each move Jev chooses from is a plain sentence, such as stopping dead part way out so less of the sniper is exposed. It is a simulation, not real Counter-Strike, and its server-side Jev connection is not public, so the model behind it is as he describes.
How you can use it
The idea carries over to other games. Describe each move a computer player could make in one plain sentence, including its cost, such as being exposed while moving or unable to shoot for a moment. Let Jev pick one and let the game itself carry it out.