Sparrow

Player

Local profile — no sign-in needed, everything stays on this device.

Sync across devices

Link this profile to another device (or the app) so your games, achievements, and settings show up on both — no account or password needed.

Have a code from another device?

Achievements (0/13)

First Steps

Play your first game against Sparrow.

First Blood

Win a game against Sparrow.

Calibrated

Finish both placement games.

Regular

Play 10 games.

Dedicated

Play 50 games.

On a Roll

Win 3 games in a row.

Hot Streak

Win 5 games in a row.

Week One

Play 7 days in a row.

Clean Sheet

Finish a game with zero blunders.

Precision

Score 95%+ accuracy in a game.

Giant Slayer

Beat Sparrow while it was calibrated at 1800+ Elo.

Puzzle Sprinter

Solve 10 puzzles in one Puzzle Rush run.

Puzzle Machine

Solve 25 puzzles in one Puzzle Rush run.

Profile

Display name

Board & Pieces

Theme

Board colors

Board texture

Piece accent

Show board coordinates

The a-h / 1-8 labels around the edge of the board.

Highlight last move

Tint the from/to squares of the most recent move.

Piece move speed

Gameplay

Always promote to queen

Off shows a picker so you can under-promote (rook/bishop/knight) when it matters.

Show legal moves

Dots on the squares a selected piece can move to.

Confirm move before playing

A checkmark/cancel appears instead of the move being sent right away.

White always on bottom

Keep the board orientation fixed even when you're playing Black.

Move input

Interface

Piece icons in the move list

Small piece glyphs instead of bare letters (N, B, R, Q, K).

Show eval number in game review

A win% readout next to the momentum chart as you scrub through a reviewed game.

Sound volume: 50%

Target win rate: 50%

Sparrow always plays adaptively, retuning its own strength after each game to keep your win rate near this target. Currently calibrated to 1500 Elo.

About Sparrow

Sparrow is your adaptive opponent — it plays human-like moves (Maia-2) and, in Adaptive mode, quietly retunes its own strength after every game to keep the score close to your target win rate (50% right now). The more you play, the better it tracks your level.

Danger zone

Permanently deletes every recorded game, your accuracy history, and the tactics log. Your Sparrow calibration level and profile name are kept.

Wipes everything above, plus your Sparrow calibration — so the site plays exactly like it would for a brand new player, onboarding screen included.