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Counting Outs Drill

Practice counting outs across the 9-game mix — Hold'em, Omaha (Hi-Lo), Stud, Razz, and 2-7 Draw. Exact deck-accurate answers, live-card discounting in Stud/Razz, the two-hole-card rule in Omaha, and per-game accuracy tracking.

Stack Journey

Live stack-tracking the way it happens at the table — action streams one card at a time, no rewinding, and the run never stops. Keep a running count through bets, calls, wins, and losses; gold checkpoints test the number you've been holding. Chips and big-blind modes.

Mixed Game Quizzes

Tutorials and self-grading quizzes for all 14 games in the WSOP mixed-event rotations — Hold'em (NL/Limit), Pot-Limit Omaha, Omaha Hi-Lo, Big O, Stud, Stud Hi-Lo, Razz, 2-7 (single + triple draw), A-5 Triple Draw, Badugi, and 5-Card Double Draw. Pick a game, read the rules, then quiz yourself tournament-ready. Includes a hand-rankings reference for high, A-5 low, and 2-7 low.

CFR Simulation

Watch a poker bot learn Kuhn poker from scratch via vanilla Counterfactual Regret Minimization. Includes a glossary and live math walkthrough.

Leduc Hold'em — Tabular CFR

One rung above Kuhn — 6 cards, public board, two betting rounds. Same CFR algorithm; converges to ε < 10 mbb/g in seconds. The standard research stepping stone toward NLH.

Leduc-NL — Custom Bet Sizes

Same Leduc engine, but bets come from a menu of pot fractions (½ pot, pot, 2× pot, all-in). Action abstraction at toy scale — the first place the NL bet-sizing problem actually appears.

Leduc-NL Re-solver

Pick a spot, pick a custom bet menu (with sizes that don't exist in the blueprint), click solve. Watch the strategy and EV change. The architecture Pluribus and DeepStack run every decision — at toy scale.

Leduc DeepStack — Value Network

Train a small MLP to predict round-2 counterfactual values, replacing the blueprint entirely. Compare neural-net predictions against an exact CFR solver. Validates DeepStack-style depth-limited solving at toy scale.

Card Isomorphism

Why suits don't matter (until they do) and how poker solvers exploit suit symmetry for a free 24× speedup. Includes an interactive canonicalizer — type any hand+board and see its equivalence class size live.

CFR+ on Kuhn Poker

Floor cumulative regret at zero and use weighted strategy averaging — converges roughly an order of magnitude faster than vanilla CFR. Tammelin, 2014.

Discounted CFR

Discount past regret and strategy contributions with α/β/γ weights. The modern default for tabular CFR. Brown & Sandholm, 2019.

Inside postflop-solver

Code walk through the open-source Rust NLH solver that the author claims beats PioSOLVER and GTO+. Customized DCFR (α=1.5, β=0, γ=3, with a power-of-4 strategy reset), no card abstraction, SIMD-tuned. ~10k lines.

External Sampling MCCFR

Sample a single chance outcome per iteration instead of walking all 6 deals. Trades variance for speed. Lanctot et al., 2009.

MCCFR Variants

Side-by-side comparison of Chance, External, and Outcome sampling — three ways to sample the tree, one clear winner in practice.

Deep CFR Explained

Conceptual walkthrough of how CFR drops its lookup table for a neural-network function approximator — and why that lets it scale beyond toy games.

Deep CFR on Kuhn Poker

Tabular regret tables replaced by a neural network. Same convergence guarantees, no per-info-set bookkeeping. Brown, Lerer, Gross, Sandholm — ICML 2019.

Convergence Metrics

Exploitability, average-strategy distance, and other indicators of how CFR approaches Nash equilibrium.

Badugi Tutorial

Rules, strategy, and hand rankings for Badugi — a four-card lowball draw game.

Building a Custom Bet-Size Solver

Why a Deep CFR blueprint alone can't handle arbitrary bet sizes — and how Pluribus/DeepStack add action translation and depth-limited re-solving to get there. Personal summary, unverified.

R&D Investments & Past Returns

Maletic 2019 — when high R&D spending predicts higher future stock returns depends on whether you mean the level or the change, and on past performance. Two interactions, opposite signs.

Thai Music IME

An input method editor for Thai classical music notation — type Thai music symbols directly with a custom keyboard mapping.