Adaptive Chess

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What it is

A free, browser-based chess game and trainer that adapts to your rating in real time. The opponent is Stockfish, set to play at your current Elo. There's no signup, no install, and your data stays in your browser.

Features

Adaptive Stockfish opponent (1320–3190 Elo) that adjusts after every game
Three opponent styles: aggressive, balanced, defensive
Opening focus practice — Italian, Ruy Lopez, Queen's Gambit, Sicilian, French, Caro-Kann, King's Indian Defense, London System
Per-move engine analysis with blunder, mistake, and inaccuracy classification
Automatic puzzle generation from your own weak moves
Saved-positions library for self-study
Game review with engine eval bar and best-line annotations
Training mode that prompts you when a stronger move is available
Click-to-move and drag-to-move support
Multiple board themes including a print-style tournament theme
Copy-to-clipboard PGN with annotation glyphs (??, ?, ?!) for sharing or pasting into an LLM coach

Source code and discussion: github.com/sethimadhav10/adaptivechess

Adaptive Chess

Pick a rating range — the opponent starts at the middle and adapts as you play.

Rating range ⓘ

Min Elo Max Elo

Color

Time per side

Each side gets this much total thinking time. Lose on time = lose the game.

Opening focus (optional)

Opponent style

Training mode

Prompts you when a stronger move is available, so you can reconsider. Rating still updates.

Tap a piece to select it, tap a square to move.

Opponent Balanced

You

Scoresheet

Training mode

Prompts you when a stronger move is available, so you can reconsider. Rating still updates.

Opponent style

Stats

Navigate moves

Opening focus (next game)

Forces the opponent to follow this line.

Worst-move puzzles

Auto-saved from inaccuracies, mistakes, and blunders. Click one to drill it, or hit a Practice button to drill them in random order.

Saved positions

Positions you marked for later study.

Past games

Click Review to step through the moves with engine analysis.

Game over

Coach prompt: paste into ChatGPT, Claude, or any LLM to get feedback on this game.

Training mode for next game

Prompts you when a stronger move is available, so you can reconsider. Rating still updates.

Opponent

—

You

Show best move

Variation from move 0

Adaptive Chess

Worst-move puzzles

Saved positions

Drill

Past games

Game over

Per-move analysis