otter-crew

Work

Things built and rebuilt.

A few of the projects and engagements that say the most about how I work. Each is a study in making a system legible again.

  • 2026 In progress

    rs-poker

    rs-poker is a Rust library for poker built for correctness and speed in equal measure: hand evaluation at tens of millions of hands per second per core, Monte Carlo equity, ICM, starting-hand range parsing, and an arena for pitting agents against one another across Texas Hold’em and Omaha.

    Version 5 is releasing soon. It ships a multi-threaded Counterfactual Regret Minimization (CFR) solver, the first parallel CFR implementation available in open source, using PCFR+ regret matching and parallel tree exploration to learn game-theory-optimal strategies.

    Author and maintainer github.com

  • 2026 In progress

    little-sorry

    little-sorry is a Rust library for Counterfactual Regret Minimization (CFR), the family of algorithms used to converge on Nash-equilibrium strategies in imperfect-information games like poker.

    It ships six regret-learning variants behind a single RegretMinimizer trait — CFR+, Discounted CFR, DCFR+, Linear CFR, Predictive CFR+ (PCFR+), and Predictive DCFR+ (PDCFR+) — so an agent can swap learning rules generically and measure which converges fastest on a given game. The hot path allocates nothing: regret updates run without touching the heap, and the only dependency is rand.

    little-sorry now powers the CFR solver in rs-poker, where its predictive regret matching does the equilibrium-finding work.

    Author and maintainer github.com

  • 2026 Coming soon

    Range Reader

    A GPT model trained to read hand ranges of a game theory optimal poker solver. Novel embedding and token architectures. More to share soon.

  • 2026 Coming soon

    World Editor

    A local-first, AI-embedded markdown editor that hosts its own language model on device. More to share soon.

  • 2026 Coming soon

    What the Duck

    A local newsletter for Nashville, Tennessee. What the Duck is going on in Nashville? We tell you.