How to Choose an Opening Repertoire Without Memorising Mountains of Theory

Opening advice tends to split into two camps: memorise everything, or don't bother. Neither helps most players. What works is a small repertoire that you understand, chosen from the positions you actually reach, and adjusted with evidence instead of after a bad game.

By the RookSac teamSeptember 29, 20265 min read

What a repertoire is, and what it isn't

A repertoire is a small set of openings you know how to play, not a library of lines. The important word is know: you understand the typical pawn structures, where the pieces belong and what the standard plans are, so when your opponent leaves the book you can still play sensible moves. Memory helps only until the first surprise. Understanding helps for the rest of the game.

For most players below master level, the structure of the position after ten moves matters far more than whether you remember move fourteen of a sideline. A repertoire chosen for its structures also transfers between games: the ideas you learn in one opening are useful in the next.

Start from what you actually play

Before choosing anything, look at your last 50 to 100 games. Which first moves do you play as White? What do you reply to 1.e4 and 1.d4 as Black? Which openings do you reach most often, and how do they score? Your own results are the best evidence of what your repertoire is now, and where its weak spots are. A report that groups your games by opening (see reviewing many games at once) makes this a one-minute job.

You will probably find that you already have a repertoire, just not a chosen one: a couple of habits that you fall into and a scattering of openings you have played once.

Even elite players repeat themselves

In the three RookSac sample reports (100 real games each; see the sample report) the players did not play a wide range of openings. Their most common choices dominate:

Each player has one or two favourite systems with each colour and a few others for variety. If the strongest players lean on a small core, so can you. Depth in a few openings beats shallow knowledge of many.

How to choose

You need four things: a first move as White (or a system), a reply to 1.e4, a reply to 1.d4, and a plan for the less common first moves. Use these tests rather than trying to find the best opening, which doesn't exist at your level:

• Do you like the structures? Play through ten model games. If the positions bore or confuse you, you'll stop studying the opening.
• Are the plans clear? Openings where you know what to do in the middlegame (which pawn break, which piece placement) suit players who are still building calculation skill. Openings that depend on precise move orders suit players who enjoy memorising.
• Does it fit the time control? In blitz, low-theory setups that you can play fast are worth more than sharp lines that need exact recall. In classical games, deeper preparation can pay off.
• Can you get material to study? Choose openings with plenty of model games and explanations, so you can learn from them without a coach.
• Is it sound enough? You do not need the objectively best move; you need a line that isn't losing by force against reasonable play. Most mainstream openings pass.

Resist choosing an opening because a famous player plays it. Their repertoire is built on a level of preparation and calculation that yours isn't.

How to learn one opening properly

1. Learn the ideas first. Read a short guide or watch a lesson that explains what each side is trying to do. Do this before you memorise a single line.
2. Study three to five model games from the opening, including ones that White or Black lost, and note the recurring plans and tactics.
3. Learn the traps on both sides. A trap you know is a piece won, or a piece saved. (The Fried Liver example in how to review your games is one.)
4. Drill the first eight to ten moves until you can play them without thinking. That saves clock time for the moves that need it.
5. Review where you left the book. After each game, find the first move that was not known theory and see what happened next. In a RookSac review that is the first move without the Book label. If your positions after leaving the book are poor, that is a gap in your preparation you can fix.

When to change something

The urge to drop an opening after a couple of losses is strong and usually wrong. Small samples mislead; a ten-game slice can't tell a bad opening from a bad week (see the noise table in reviewing many games). Use these rules instead:

• Wait for at least 30 games with the opening before judging it.
• Look at accuracy as well as results. An opening that scores poorly but gives you good positions is a conversion problem, not an opening problem.
• Find the recurring line. If most of your losses come from one sideline you don't know, add that sideline to your study, not a new opening.
• Change one thing at a time. Swap a reply or a line, then measure again over another 30 games.

Common mistakes

• Too many openings. Playing something different every game means learning none of them.
• Memorising without understanding. The first surprising reply and the memory is useless.
• Ignoring the sidelines. Most of the time you'll face the main line less often than you expect. Have at least one sensible plan against each common deviation.
• Neglecting the middlegame. A perfect opening with no plan afterwards still loses. Many players lose more points in the middlegame than in the opening; see the phase breakdown in a report.