Always-on coach
Every wrong move, corrected on the spot.
Stumble and the piece snaps back, a glowing hint arrow points the way, and the last move stays lit — so the mistake never makes it into your memory.
Snap-back · Hint arrows · Move review
Master openings the way
grandmasters actually study them.
AI Coach
Personalized review queues that adapt to what you forget.
From first move to endgame.
Train your opening repertoire with spaced repetition, line drills, and live engine evaluation. Hundreds of variations, 20+ openings.
Sicilian Defense B20Italian Game C50Queen's Gambit D06Ruy Lopez C60French Defense C00Caro-Kann B10English Opening A10King's Indian E60London System D02Scandinavian B01Sicilian Defense B20Italian Game C50Queen's Gambit D06Ruy Lopez C60French Defense C00Caro-Kann B10English Opening A10King's Indian E60London System D02Scandinavian B01
Why CheckmateXNot videos. Not flashcards.
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.
The opening tree
Real book theory, branch by branch.
Not one linear script — the whole tree. Mainlines, sidelines, and every "but what if they play this?" transposition, each drilled on its own, then woven back together.
20 openings · 250+ lines · real ECO
Mastery that sticks
Watch each line climb to 100%.
Every correct rep lifts your mastery on that line. Reach 100% and Practice mode unlocks — shuffled, randomized, no hints — turning rote recall into table-side reflex.
Per-line % · Practice mode · 34 achievements
The trainer
A coach that plays back.
Choose an opening, pick a line, and start. The board responds in real time. Right move → it advances. Stumble → snap-back, a red flash, and a hint arrow. No theory dump — just the move you forgot, on the board where it matters.
- 1Branching lines, not flashcardsA real opening tree: mainlines, every transposition, every sideline branch.
- 2Hint arrows when you stallTap Hint and a glowing arrow shows the move — it lingers one beat so the pattern sticks.
- 3Practice unlocks at masteryHit 100% on a line and Practice opens — shuffled, accuracy-tracked drills with no safety net.
8
76
5
4
3
2
ab
c
d
efg
h1KW
Coach
Italian · move 6
Nice — now play Bc4 to develop the bishop and aim at the f7 square.
87%Accuracy
14Streak
Next line ›
How it worksFrom "what was move 6 again?"
From "what was move 6 again?"
to opening reflex — in three steps.
1
Pick an opening
Browse the 3D library or the catalog grid. Tap any node to see its ECO code, theory depth, and how many lines you've trained.
2
Drill move by move
The board waits for your move. Right → auto-advance. Wrong → snap-back and a hint arrow. Your accuracy tracks as you go.
3
Watch it stick
Each clean line lifts your mastery %. Hit 100 and Practice mode opens — shuffled, randomized, no safety net.
What players say
Built for anyone tired of forgetting move 7.
★★★★★
I'd watched the same Italian Game video three times this year and still blanked on the Two Knights. After 11 minutes in the trainer I haven't blanked since.
★★★★★
The library view is the first time I've actually seen the structure of opening theory. The London and the Queen's Gambit are literally neighbors now. Sounds dumb until you try it.
★★★★★
Hint arrow plus auto-advance is the trick. It feels like solving a puzzle, not reading flashcards. My OTB results haven't changed yet but my confidence sure has.
Pricing
Free forever for the basics. Pro for the rest.
No card to start. Cancel anytime if you upgrade. We don't have a sales team and never will.
Free
$0/ forever
The full opening library and trainer — paced by a daily energy meter, with ads. Refill through quests or a rewarded ad.
- ✓All 20 openings, energy-paced
- ✓Trainer: hints, snap-back & mastery %
- ✓Daily energy, quests & achievements
- ✓Up to 20 of your own openings
Best value
Pro · Yearly
$4.17/ month
$50 billed yearly · save 17%
Everything in Free, unlocked — at the lowest price per month. Train without limits, no ads.
- ✓Unlimited energy — train without limits
- ✓Ad-free, everywhere
- ✓All 20 openings · 250+ lines
- ✓Full Practice mode (shuffled drills)
- ✓Unlimited custom openings
Pro · Monthly
$5/ month
Billed monthly · cancel anytime
All of Pro, month to month — the same unlocks, no yearly commitment.
- ✓Everything in Pro Yearly
- ✓Unlimited energy · ad-free
- ✓All 20 openings · 250+ lines
- ✓Cancel anytime
Cancel any time from your profile. You keep Pro to the end of the period you paid for.
Ready to map your repertoire?
Your openings deserve a better home than a forgotten Notion doc.
Open the library, pick an opening, and start training. Free forever. No card. Web and Android — iOS soon.