For chess coaches · free

Every student’s progress. One screen.

Send a repertoire. See who drilled it, what stuck, who asked for help. Your students check their own games in ten seconds, and every mistake becomes a line they practise before the next lesson.

Open the app → Watch a game check

A student? Check a game free, no account ↓

SPHG

Made by Sonny Parlin and Harold Gonzalez. Independent, not affiliated with Lichess or Chess.com.

Blunder 8… Nxe4??

White

+1.0

Look at Be7 here. We drilled this exact spot last week — drill it again tonight.Coach · on the move

Runs on your deviceThe game check uses Stockfish inside your browser. No game ever leaves the room.

Lichess + Chess.comImport by link or by username. Paste a Lichess study and every chapter becomes a line.

Web, iPhone, AndroidOne account, every device, works offline. Edits made offline catch up when you reconnect.

Plain PGN filesYour notebooks open in any chess program. Download every one, and a full backup, in one click.

Twenty seconds, start to finish

Watch a game check.

These are real screens, not drawings. Morphy against the Duke of Brunswick, 1858, checked on a laptop in the time it takes to read this.

The game check page: one box that takes a link, a username or the moves

The check in progress: a ring at 18 percent, 'Checking move 3 of 17', three stages listed

The finished report: accuracy rings for both players, a plain-words summary, the board and the graded move list

01 · Paste anything

✓ Real capture, October 2026✓ Dark theme shown; light is one tap✓ Same on the phone

How it works

Check it. Save it. Train it.

One game becomes a lesson, the lesson becomes lines, and the lines come back right before they are forgotten.

Check a game

Paste a link or a username. Every move is graded on your device and the lesson is written in plain words.

Save the fix

One tap turns the key moments into lines in a notebook. Have a repertoire? Paste a Lichess study.

Train it

Lines come back just before they are forgotten. Puzzles come from your own games. Your coach sees what stuck.

For coaches

Your whole class, before the lesson starts.

Who practised, who stalled, who asked for help — on one screen, so the hour goes on chess instead of catching up.

■A dashboard, not a guessWhat each student knows, when they last drilled, how long since they checked in.
❝Notes on the moveA student sends a game or a question. Your note lands on the exact move, in your own words.
▶Yours to keepNotebooks are plain chess files. Download everything in one click, print a study sheet, work offline.

Thursday group7 students · code 4K9-TRN

AMAmaraItalian Game · 22 lines

Last 7 days

Known

On track

DKDevKing’s Gambit · 15 lines

Last 7 days

Known

Asked for help

LRLenaCaro-Kann · 31 lines

Last 7 days

Known

On track

TOTomasLondon · 9 lines

Last 7 days

Known

6 days quiet

SPSofiaSicilian · 18 lines

Last 7 days

Known

4 lines due

Sample class, drawn live · the real screens are below

This is the app

Real screens. Nothing staged.

What a student opens on a laptop, and what the drill looks like in their hand.

The Today screen on a laptop: the ready ring, the next line to pick up on a board, notebooks, and a check-a-game card

Today · what is ready, where you left off, your notebooks1440 × 900

The Notebooks screen: your notebooks, a read-only library of main lines, and starter packs you can add with one tap

Notebooks · yours, the library, and starter packs for new players1440 × 900

A drill on the phone: the board, 'Italian Game, recall the White moves', Your move, and Hint and Show me buttons

Drill · recall the move on the board. Hint, then Show me, then it comes back later.

The game report on the phone: accuracy rings, 'played like 1150 to 1450', and a one-line summary

Report · the same check on a phone.

For students

Check your last game. Right now.

Paste the link. Every move gets graded on your device and the lesson is written in words you can use. Save the fix and it becomes a line you drill. No account, nothing uploaded.

Plain words

No jargon. What went wrong, and what to do instead.

A ten-year-old can read the lesson. So can a parent. The numbers are there if you want them, one tap away.

8… Nxe4??

This walks into a forced mate. Be7 holds the position together.

Instead: 8…Be7 9.Nxf6+ Qxf6

6… Bxd1??

Grabbing the queen walks straight into mate. Look at what your king is doing first.

Instead: 6…Be6 7.Qxg4 Nxe5

12. Nd5?

The knight ignores the pinned queen. Take what is pinned before it runs away.

Instead: 12.Bxf6 Qxf6 13.Nd5

Questions coaches ask

Before you bring a class.

Do my students need an email address?

No. You mint a class code in Settings. A student joins with the code and a first name or nickname. That account has no email, no password, no profile and no messaging, by design. The name is shown only to you.

What about students under 13?

Class-code accounts collect nothing beyond that first name and their study data: notebooks, drill progress, puzzles. There are no ads and no social feed. You or a parent can have a class account deleted on request. The full wording is on the privacy page.

Where do the games come from?

Students paste a Chess.com or Lichess link, or import every game by username. Re-importing refreshes a game instead of duplicating it. You can also paste a Lichess study and every chapter becomes a line in a notebook.

Is anything uploaded when a game is checked?

No. The game check runs Stockfish inside the browser, on the student's own device. Without signing in, notebooks live in the browser's local storage and never leave it. Signing in syncs notebooks, drill progress and puzzles across devices.

What does "see what stuck" actually mean?

Every line a student drills is scored. On your screen each student shows what they know, when they last practised, how long since they checked in, and whether they sent you a game or a question. Your note lands on the exact move.

Can we leave, and take everything?

Yes. Notebooks are plain PGN files that open in any chess program. Download any notebook, or a full backup of everything, in one click. There is nothing to cancel because there is nothing to pay.

Which devices?

The web app at coachmatechess.com/app on any browser, installed to a home screen, or the iPhone and Android apps. All of them work offline; sync and stats wait for a connection.

Every student’s progress. One screen.

Watch a game check.