Repertoire · Openings

Own your repertoire.
Don't rent your memory.

A smarter way to reach — and keep — a high-enough level of opening knowledge, for the least time it can possibly cost you.

Let's be honest up front: there's no silver bullet here. If what you want is to absorb thousands of elite lines with no effort, Two Bishops isn't the tool for you. What we offer is a model built for the player you actually are — someone with a job, a family, and a finite number of hours to spend on chess.

The tools you've already tried

Most opening trainers fall into two camps, and both have a ceiling.

Predefined content, memorized by spaced repetition

The first camp hands you ready-made courses and layers spaced repetition on top to drill them in. Chessable is the best of these by a wide margin; much of the rest is low-quality content that's fine for a beginner and thin for a serious player. But even at its best, the model has structural problems that every daily user eventually hits:

Review time only grows. Five finished courses can already mean close to an hour of reviews every single day — time taken from strategy, calculation and endgames, where improvers actually gain rating.
You can't step away. Take a tournament week or a family holiday and the "due" lines pile up. You come back to a wall of debt — and this is exactly where most people quietly give up.
It fades anyway. Spaced repetition feels great for the first couple of months after a course. Then, honestly, a meaningful share of those lines are gone regardless.
It's poor for the game in front of you. You're facing a London System devotee tomorrow and have two hours to prepare. Cramming the right lines on demand is exactly what card-based review isn't built for.

The spaced-repetition treadmill: the daily load climbs as you add courses — and one week away means returning to your regular reviews plus a backlog, well past 1.5 hours a day until you clear it.

Bring your own content

The second camp — ChessTempo, Chessbook and a few others — lets you import your own lines, which is the right instinct. But in practice the repertoire organization is weak, and they inherit the very same spaced-repetition problems described above.

What good opening prep actually takes

Strong preparation rests on four things: analysis chosen for your specific needs, memorization, regular practice, and deep understanding. Most tools obsess over the second and quietly neglect the other three.

Chasing 100% recall of every line is a losing game. The goal is a high-enough level of knowledge, held at the lowest possible cost in time.

How Two Bishops works

We don't ship you lines. You bring content that fits your own repertoire and level — from courses, books, YouTube, your coach, wherever you trust. Two Bishops picks up the moment your analysis is done.

Everything is built around repertoire units: a digestible set of lines — roughly 100–300 unique moves — such as your answer to the Stockholm Variation of the Grünfeld. You certify a unit by rehearsing it until you hit your target accuracy, then re-certify on a comfortable cadence — say, every three to four months.

Loose material from any source, organized into self-contained units you can certify one at a time.

The key difference: there is no daily flashcard treadmill. Instead, you play. We suggest a rhythm of nine games once a week — an idea we like from ChessMood's "golden method" — but the cadence is yours. Your own games are the strongest possible signal that a line has gone stale, far better than an algorithm guessing on a schedule. Deviate from a unit in a real game and Two Bishops flags it as stale and brings it back to your attention. Heading into a tournament round with real time to prepare? Re-certify the relevant unit before you sit down.

Certification isn't a one-time event — it's a loop, driven by the games you're already playing.

Leaning on real games instead of cards changes everything about the experience:

You practice in games that matter. Playing your repertoire out — even in blitz — beats endless card-flipping for building genuine, usable recall.
You can take the vacation. Step away for a week or a month, come back, and there's no rehearsal debt waiting to bury you.

From memory to real understanding

Memorization is only one of the four pillars. Your repertoire doesn't end when the theory does — every line hands you a middlegame, and eventually an endgame, to play. We're building features that help you get better at exactly those positions, and give you a place to practice them:

SoonPuzzles pulled automatically from real Lichess games that reached positions close to your repertoire — so you sharpen the middlegames and endgames your openings actually lead to.
SoonMaster games near your own lines, so you can see how strong players handle your structures and pick up the typical plans and endgames.
End of 2026Play your repertoire out against a bot at roughly your own strength — a sparring partner that's ready whenever you are.

Own your repertoire. Certify it. Then go play.