More

Train

Drill square names until the board feels automatic.

Board

Highlight squares attacked by the opponent (the side that just moved).

Threatened squares

Colors

Customize the app, board, and pieces. Saved on this device.

8

7

6

5

4

3

2

a1

b

c

d

e

f

g

h

Light squares#f4f4f5Dark squares#3f3f46White pieces#ffffffBlack pieces#0a0a0aAccent#2563ebApp background#ffffffText#0a0a0a

Storage

Games, reviews, stats, and puzzles stay in this browser. iOS may clear site data when storage is low.

Engine

Stockfish 18 lite (single-thread) for Safari compatibility.

Offline

After you open the site once online, the app shell, icons, and chess engine are cached for offline play. Games and stats already live on this device.

Tip: Add to Home Screen, then launch from the icon for the best offline experience.