Sources and licences

Chess

The positions come from the Lichess puzzle database, released under CC0. We checked every solution move with Stockfish (GPL-3.0) at depth 18: the solution must be the best move by a clear margin. The feedback on other moves comes from a Stockfish analysis at depth 10. The analysis of moves off the solution runs live on our server, also at depth 10, and is not checked in advance.

Poker (being built)

PokerTrainer is not available yet. The hands will come from the Pluribus hands in the PHH dataset (CC-BY 4.0), of the hands played by Pluribus (Brown and Sandholm, 2019). The answers will come from two solvers under our own ranges.

Pieces and fonts

Chess pieces: cburnett, BSD licence, via Wikimedia Commons. Fonts: Schibsted Grotesk and Spline Sans Mono, SIL Open Font License.

Not affiliated

These apps are not affiliated with Lichess, Stockfish or the makers of Pluribus.