Plyra Chess investigates a position the way a strong coach would: it forms ideas, tests each one on Stockfish with rules fixed in advance, lets a reviewer attack the conclusions, and explains only what survived. Then it reviews your whole game history and ranks the mistakes that cost you the most points.
Free plan included. Engine analysis is unlimited and runs on your computer.
Hypothesis: f7 is the target. Only a counter-strike in the centre keeps Black level.
Pass rule, fixed before the search: 4…d5 must score at least 1.00 pawn better for Black than 4…Nxe4.
| Move | Main line | Eval |
|---|---|---|
| 4…d5 | 5.exd5 Na5 6.Bb5+ c6 | +0.06 |
| 4…Bc5 | 5.Bxf7+ Ke7 6.Bc4 | +0.99 |
| 4…Nxe4 | 5.Bxf7+ Ke7 6.d4 h6 | +1.90 |
● supported gap 1.84 · Stockfish 16 · depth 24
Paste a FEN or a PGN, or play moves on the board. Get the best move, the idea behind it, the plans for both sides and the traps, each tied to the engine evidence that supports it.
Enter your Chess.com or Lichess username. Every move of your recent games is checked by Stockfish, and each mistake is classified by its cause.
A written summary of what to fix first, built from your own numbers. Every figure in it is checked against your data before you see it.
Most AI chess explanations sound right and are often wrong. Here the AI never reports an evaluation it did not get from the engine.
The AI reads the position and proposes specific, testable ideas: a plan, a weakness, a tactic.
Each idea gets an experiment on Stockfish with a pass rule written down before the search runs.
A separate reviewer looks for refutations and weak evidence. Ideas that fail are dropped or downgraded.
You get the lesson, the critical lines and the evidence trail, at the level you choose.
Engine features are free on every plan because they run on your own computer. Plans differ in how much AI explanation you get each month.
Your licence key arrives by email. Paste it on the app's Plan & licence page.
macOS and Linux: download the zip, install Stockfish (brew install stockfish), then run python3 installer/setup_app.py.
No. Using engine or AI help in a game you are playing breaks the fair-play rules of Chess.com, Lichess and over-the-board events. Use it to study positions and finished games.
Only for the opening explorer and the opening-theory check in account reviews. They use Lichess's free game database, which asks for a free Lichess login. Connect it once in the app; the connection stays on your computer and needs no permissions. Everything else works without it, including reviews of Chess.com accounts.
Stockfish, the account review and all your saved analyses run and stay on your computer. Your public games are downloaded from Chess.com or Lichess. AI explanations are produced by our AI service, which receives the position and the engine evidence for that investigation. See the privacy policy.
Engine analysis, account reviews and the opening explorer keep working without limits. Free AI renews every Monday; Pro has a much larger monthly allowance that resets on the first of the month. The app shows what is left on the Plan & licence page.
Windows shows that warning for new programs that are not yet widely downloaded. Choose More info, then Run anyway. The installer only writes to your own user folders and needs no admin rights.
Use the “Manage subscription” link in your purchase email. Pro stays active until the end of the period you paid for.
To update, run the newest installer; your settings, licence and analyses are kept. To uninstall, use Windows Settings → Apps → Plyra Chess.
Plyra Chess