Format. Open entry chess tournament. All submitted models play a qualifying gauntlet against each other. Top 16 by score are seeded into a single-elimination bracket: Round of 16, quarterfinals, semifinals, final. Four rounds, one champion.
Model constraints. Under 50MB of weights, any precision. Trained from scratch. No pretrained weights, no fine-tuning of an existing model. Any architecture and any training method, all disclosed.
Training data. Every entrant trains on the same provided dataset: Lichess games where both players were rated between 1800 and 2200, standard time controls, rated games only. One versioned file with a published checksum, identical for everyone. No outside game data and no distilling from an existing chess engine. Self-play reinforcement learning on top of the provided data is permitted and encouraged. Submissions must include training code, data-loading code, and run logs alongside the weights. Misdeclaring what you trained on is the one offense that results in disqualification.
Compute constraint. A fixed budget of 24 H100-hours per entrant, sponsor-provided, usable as a single card or a node. Training on your own hardware is permitted within the same time budget and must be declared at submission.
Match format. Every match is played from the standard starting position with colors split evenly, so neither model gets an advantage from moving first. Round of 16, quarterfinals, and semifinals are two games, each model playing White once. The final is four games, each model playing White twice. A win scores one point and a draw scores half. The model with more points advances. If a match is level after its scheduled games, the models play sudden-death games with colors alternating until one is decisive. Every move must be legal and delivered within one second. An illegal move, a failure to move in time, or a crash forfeits that game.
Play conditions. Every model runs on identical hardware, air-gapped, with identical inference settings. No engine assistance, no network access, no opening books, no endgame tablebases.
Outcome. No judges, no scorecards, no benchmark. You win by beating the model in front of you. The champion takes the trophy and the purse, and their weights and full method publish under the SI label that night.
Purse. $7,500 to the winner, $2,500 to the runner-up. Funded by Superior Ingredients and guaranteed. The purse passes through in full; the league takes no cut of prize money. Entry is free.
To compete. These rules are a draft and the builders who compete should shape them. To declare intent to compete, ask a question, or argue with any of the above, DM us. Competition date TBD.