rbitope

Front-wheel drive or rear? Is 50:50 weight distribution real engineering or a marketing number? Built from a measured tire file and a minimum-time solver, the famous answers come out smaller than the arguments about them — until the driver can be surprised. Runs live in your browser, on the same tire the results use.

A new account has no results, so matchmaking guesses and waits — which is also the cheapest escape hatch for anyone who wants to farm beginners. Train a labelled skill ladder by self-play instead, measure each checkpoint’s real strength with a round robin, and point a classifier at the opening move. On Connect Four, most of the signal is already there by move one.

A player who throws matches to keep their rating low is invisible to any test that reads wins and losses — provably, at any sample size. What they wager gives them away: caught in a median of 14 matches, with the evasion priced so that hiding costs more than cheating pays.

A two-player ring-out fight. Push beats dodge, dodge beats block, block beats push — and the opponents are reinforcement-learning agents trained to read your commits.

An elevator RL control sandbox — train a dispatcher against heuristic baselines and watch the two argue on a live dashboard.

A Rush Hour puzzle generator and solver, extended into a hex-grid variant — with graph metrics that reveal what actually makes a sliding-block puzzle hard.

A framework for making RL environments up to 92× faster without giving up the version you can read — write it twice from one spec, and let a validation battery prove the two are bit-for-bit the same environment.

A two-player hex tile game where the arcs chain into loops that belong to the board, not to either player — and closing one scores the area it encloses. Playable in the browser against a pure-search opponent with no machine learning in it.

A 1993 Usenet thread explained neural network training by parachuting a kangaroo over Asia to find Everest — this renders it. Six search methods hopping across real elevation data, up to the whole planet, where a quarter of the blind ones drown.