Chess opening trainer
Master openings the way grandmasters study them.
Pick a real opening, drill it move by move, and let the board correct you in real time — spaced repetition, live engine eval, 20+ openings.
Not videos. Not flashcards.
A board that corrects you.
Pick a real opening, drill the line move by move, and let the board do the teaching. Three things make it stick.
Corrected on the spot
Every wrong move snaps back with a glowing hint arrow pointing the right way — so the mistake never makes it into your memory.
Real book theory
Not one line — the whole tree. Mainlines, sidelines and every trap, explored in its own branch and woven back together.
Climb to 100%
Every correct rep lifts your mastery on the line. Reach 100% and Practice mode unlocks — shuffled, no table-side reflex.
A coach that plays back.
Choose an opening, pick a line, and start. The board responds in real time — right move advances, a stumble snaps back with a red flash and a hint arrow.
Branching lines, not flashcards
Mainlines, transpositions and every sideline branch.
Hint arrows when you stall
Tap and a glowing arrow shows the move — 8 fingers beat memory.
Practice unlocks at mastery
Hit 100% and Practice opens — shuffled, accuracy-tracked, no safety net.
Nice — now play Bc4 to develop the bishop and aim at the f7 square.
From “what was move 6 again?” to opening reflex — in three steps.
Pick an opening
Browse the 3D library or the grid. Every opening shows its ECO code, real depth, and how many lines you've trained.
Drill move by move
The board waits for you. Right move auto-advances; a wrong one snaps back with a hint arrow. Your accuracy tracks as you go.
Watch it stick
Each clean line lifts your mastery %. Hit 100% and Practice mode opens — shuffled and randomized, no safety net.
No account needed to start — your progress saves locally, then syncs the moment you sign in with Google.
Free forever for the basics. Pro for the rest.
No card to start. The whole library is free — energy-paced. Pro lifts the limits.
- All 20 openings & 250+ lines
- Trainer: hints, snap-back & mastery %
- Daily energy, quests & achievements
- Web + Android · shared progress
- Unlimited energy — train without limits
- Ad-free, everywhere
- Full Practice mode & advanced analytics
- Unlimited custom openings + Pro badge
- Everything in Pro Yearly
- Unlimited energy · ad-free
- All 20 openings · 250+ lines
- Cancel anytime
Same Pro, two ways to pay. Exact prices are set per region in the store.
Everything you might wonder.
Short answers to what people ask before their first line — free, accounts, openings and how the training actually works.
Still stuck? Talk to us →Yes. The whole opening library and the coached trainer are free — your training is energy-paced, and energy refills every day. Pro lifts the limits (unlimited energy, ad-free, full Practice mode) but nothing is locked away behind a paywall to start.
No. You can start training instantly as a guest — your progress is saved right in your browser. Sign in with Google whenever you want to sync your streak, mastery and energy across the web app and the Android app.
20 curated openings with 250+ drilled lines — real book theory with mainlines, sidelines and traps, including the Sicilian Defense, Italian Game, Ruy Lopez, French Defense, Caro-Kann and the Queen's Gambit.
You don't watch — you play. Pick a line and the board responds move by move: right moves advance, a wrong move snaps back with a glowing hint arrow, so mistakes never settle into memory. Every correct rep lifts your mastery on the line toward 100%.
Energy is how free training is paced — each line you train spends a little, and your energy refills in full every day at midnight. It keeps the app free and sustainable; Pro removes the cap entirely if you want to grind without stopping.
Yes — CheckmateX is on Google Play for Android, and it shares the same account, streak and progress as the web app. The website is a full product on its own, so you never need to install anything to train.
Your openings deserve a better home than a forgotten notes doc.
Open the library, pick an opening, and start training. Free forever to start. Web and Android — same account, same progress.