Opening Checker · free, standalone, no sign-in

Did you reach move ten safely?

Enter a chess.com or Lichess username. Opening Checker reads your last finished rapid and blitz games, detects which opening you actually played (London, Italian, Queen's Gambit, Sicilian, or your own system), and runs an engine in your browser to check move-ten safety and flag pieces hung before move 15.

  • Works with any opening you play
  • Never during a live game
  • Engine-checked in your browser
Check my games
Finished games only. Play whatever opening you like — no account required.
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