Unexpected early deviation
1.e4 e5 2.Qh5
Rare in master games, extremely common at club level. You only need to solve it once — then it's prepared forever.
Chess opening preparation & repertoire building
Build the chess
opening repertoire
that is actually yours.
Start with established theory, then build a repertoire around the positions you actually face — rather than a fixed, one-size-fits-all course. Discover ideas, make the repertoire your own, and train what matters to you.
Fool's MateA00
1.f3 e5 2.g4 Qh4#
Openings decide games early. Preparation is where those games are won.
Why build your own?
You don't have to reinvent the wheel. You also don't have to drive someone else's car.
Established theory is a good foundation, and a strong course teaches the main lines. But a fixed repertoire can't account for every game you'll actually play — the dubious but annoying move, the rare sideline you never memorised, or the move that's common at your rating and almost absent from master games.
OpeningForge gives you an infinitely customizable theory tree: see the position, explore what's been played, analyze the responses, decide what you want to play, save it permanently, and train it.
Theory gives you a starting point. Your own games and ideas tell you what you need to prepare. OpeningForge connects the two.
OpeningForge
A predefined course
- Build around the positions you actually faceFollows a largely predefined repertoire
- Adapt and refine your lines whenever you likeContent stays mostly fixed once published
- Prepare the odd sidelines your opponents playConcentrates on the variations it selected
- Add your own discoveries and noveltiesTeaches the author's recommendations
- Train exactly what you chose to saveYou practise the material it includes
How it works
Explore · Analyze · Build · Save · Train
Five steps, one workspace. Every position you keep becomes a position you can train.
- 1Explore
Discover common openings, moves and ideas you may want to try — see what players choose from any position.
Ideas to try: Nc6 · Nf6 · d6
- 2Analyze
Investigate the positions and ideas you found, with the engine and database side by side.
Engine +0.28 · three best lines
- 3Build
Choose the responses and variations you personally want to play.
Your answer: 3.Bc4
- 4Save
Turn those decisions into a permanent line in your own opening book.
Saved — Italian, main plan
- 5Train
Practise your repertoire so you can actually use it in real games.
Your move — what did you prepare?
Off-book preparation
Different players meet different chess
A beginner keeps meeting strange early queen moves. An intermediate player keeps meeting tricky sidelines and traps. A tournament player meets prepared deviations and novelties. No group is "better" — the point is that your repertoire should adapt to the positions you actually encounter.
Practical sideline
1.d4 d5 2.c4 e5
Objectively dubious, practically awkward. A move can be theoretically inferior and still be the one you keep facing.
Prepared surprise
1.e4 c5 … 6.g4
A deeper deviation aimed straight at your preparation. Your answer belongs in your own book, not in someone else's course.
Engine and workspace capabilities
20+
Engine depth
3
Best lines shown
∞
Saved openings
<50ms
Move response
Start your repertoire
Take established theory, adapt it to the chess you actually play, prepare for the moves your opponents actually make — and build an opening book that is truly your own.