Features — every Reality Check training mode

Improve

Puzzles

123,000+ rated puzzles from real games.

A huge, rated puzzle library drawn from real games — not artificial constructions. Your puzzle rating feeds straight into your RC Rating.

Solve puzzles →

Find the strongest move in quiet positions across 15 strategic ideas — open files, knight outposts, pawn structures, the right piece to trade. No tactics: pure positional judgment, graded move by move, with a per-theme strength profile and links to the public-domain classics (Nimzowitsch, Capablanca, Lasker) that teach each idea. Free, no account needed.

Take the Strategy Test →

Challenges

Curated sets that target one skill at a time.

Hand-picked challenge sets built around a single theme or skill, so you can train deliberately instead of at random.

Browse challenges →

TRacer

A rating check against the clock.

Take a 180-second rating check (Classic), or build a rated sprint with a Fischer clock, your own rating range and themes (Sprint). A fast, honest read on where you stand.

Start a sprint →

Blunder Check

Find the blunder. Fresh sets monthly.

Spot the mistake before it costs the game. New blunder sets every month keep your radar sharp.

Find blunders →

Play Real Games

Simulator

Play a whole GM game — and see how you measured up.

Replay a grandmaster's game move by move. At every turn you make your own decision, and we grade it against what the master actually played — ending with an Excel-style accuracy report of you vs the GM. Physical DGT board supported.

Try the Simulator →

Masters

The original reality check.

Drop into a real position from a master game and find your move. We grade you the way a strong human is judged — for the idea, not for matching Stockfish's top choice.

Play a master position →

Decision LabComing soon

Back the human or the machine.

Three positions a day where a grandmaster disagreed with Stockfish. Bet on the GM or the engine, then find out who was right. NYT-Connections for chess — a daily habit you'll want to share.

Join the waitlist →