How to Prepare Against Your Opponent's Openings

You've been paired for tomorrow's tournament game. You know your opponent's name. Now what?

Pre-game preparation is one of the most underused weapons in amateur chess. Grandmasters spend hours preparing against specific opponents before every game, often with a team of seconds helping them find novelties and sidelines. You don't need a team of seconds. You just need a browser, some common sense, and a system for turning research into lines you'll actually remember at the board.

Here's how to do it at every level, from your first tournament to serious competitive play.

Step 1: Find Your Opponent's Games

Before you can prepare, you need data. The good news is that in 2026, almost every chess player has a digital trail.

Online databases to check:

• Lichess - If they have a Lichess account, their game history is public by default. Search their username and filter by time control.
• Chess.com - Same idea, though some players have private profiles. Check their stats page for opening breakdowns.
• FIDE ratings database - For over-the-board players, search their FIDE ID to find rated game results. This won't give you moves, but it tells you who they've played and their current strength.

The goal isn't to analyze every game they've ever played. You want to answer two questions:

1. What do they play as White? Do they open with 1.e4 or 1.d4? Do they play the London System every game, or do they mix it up between the Queen's Gambit and the Catalan?
2. What do they play as Black? Against 1.e4, are they a Sicilian player or do they prefer the Caro-Kann? Against 1.d4, do they go for the King's Indian or the Queen's Gambit Declined?

Step 2: Identify Patterns and Weaknesses

Once you know what they play, dig deeper. You're looking for three things:

Their Comfort Zone

Most players below 2000 have a narrow repertoire. They play the same 2-3 openings on repeat because those are the positions they understand. If someone plays the London System in 90% of their White games, that's their comfort zone. They know the plans, the piece placements, and the typical middlegame structures.

Your first decision: do you want to meet them in their comfort zone, or drag them out of it?

Their Weak Spots

Look for openings where they consistently score poorly. Maybe they play the Italian Game as White but struggle when Black plays an early d5 push. Maybe they play the French Defense as Black but have a terrible record in the Advance Variation. These patterns reveal positions where they're less comfortable.

Also look for games where they burned a lot of time in the opening. If someone is spending 10+ minutes in the first 10 moves, they're probably out of their preparation and improvising. Those are the lines where targeted prep gives you the biggest edge.

Their Move Order Preferences

This is where preparation gets specific. Does your opponent always play the Sicilian Najdorf via 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6? Or do they sometimes play 2...Nc6 first? The exact move order matters because it determines which sidelines are available to you.

Pay attention to transpositions too. A player who opens 1.d4 Nf6 2.Nf3 might be heading for the Queen's Indian, but they could also transpose into a Nimzo-Indian if you play 3.c4. Understanding their preferred setups helps you predict where the game is heading.

Step 3: Choose Your Weapon

Now comes the fun part. Based on what you've found, pick an opening strategy. There are three approaches:

Option A: Surprise Them

If your opponent is well-prepared in mainstream lines, hit them with something unexpected. A Scotch Game player who always faces 1.e4 e5 2.Nf3 Nc6 3.d4 might not have prepared for 3.Bb5 (Ruy Lopez) or 3.Bc4 (Italian). A player who always meets 1.d4 with the King's Indian may struggle if you play 1.c4 or 1.Nf3 and steer toward an English Opening structure they're unfamiliar with.

The surprise doesn't have to be exotic. Even a well-known line they haven't faced before creates an asymmetry - you've studied it, they're improvising.

Option B: Target Their Weakness

If you spotted a weak point in their repertoire, aim directly at it. If they struggle in sharp positions, play aggressively. If they mishandle endgames, steer toward simplification. If they have a bad record against a specific variation, play that variation.

This is the most effective approach when you have clear data. Against a player who scores 30% in the Advance French, playing the Advance Variation gives you a statistical edge before you even make a move.

Option C: Play Your Best Stuff

Sometimes the best preparation is no specific preparation. If you have a rock-solid repertoire that you know deeply, the highest percentage play might be to stick with what you know rather than switching to something unfamiliar just because it might bother your opponent.

This is especially true when your opponent is significantly lower-rated. Don't overthink it. Play your best chess.

Step 4: Prepare Concrete Lines

Once you've chosen your approach, it's time to do the actual work. This means preparing specific moves, not just vague plans.

Go 10-15 moves deep in your main line. This is the critical zone where most amateur games leave theory. If you know the first 12 moves of a variation cold and your opponent starts thinking at move 7, you've already won the opening battle.

Prepare for their most likely responses. Based on the games you reviewed, predict which variation they'll choose. If they always play 6...e5 in the Najdorf, you don't need to spend time preparing for 6...e6. Focus your energy on the positions you're most likely to reach.

Know the key ideas, not just the moves. Memorizing a sequence of 15 moves is useless if you don't understand why each move is played. For every critical position in your preparation, you should be able to explain the plan in words: "I'm putting my bishop here to control that diagonal because my next idea is to push the f-pawn." Understanding the logic means you can find the right moves even when your opponent deviates.

Use an engine, but don't worship it. Stockfish will tell you the objectively best move, but the objectively best move at move 11 of the Sveshnikov Sicilian might lead to a position that's +0.3 but incredibly complex. If you're not comfortable playing those positions, choose a line that's maybe +0.1 but leads to a structure you understand. Practical chances matter more than evaluation bars.

Step 5: Drill Until It's Automatic

Here's where most preparation falls apart. You do the research, find the perfect line, analyze it with an engine, and then... sit down at the board the next day and forget everything past move 6.

The fix is simple but tedious: drill the lines until you can play them without thinking. This is where spaced repetition becomes essential. Even for short-term prep before a single game, running through your prepared lines 5-10 times the night before makes a massive difference in recall.

If you're preparing against a specific opponent for a tournament game tomorrow, load your prepared lines into Openings.gg and drill them until you can play the first 12-15 moves instantly. When you sit down at the board, that preparation will feel automatic rather than something you're struggling to remember.

For longer-term preparation - like knowing what to play against common setups you'll face repeatedly - building these lines into your permanent repertoire and reviewing them regularly is even more valuable. Every time you drill a line, you're making it more automatic for the next time you face it.

How Much Preparation is Enough?

This depends on your level and the stakes.

Casual online games: Don't prepare against specific opponents. It's not worth the time. Instead, invest in building a solid general repertoire that handles common setups. Know what you want to play against the London System, the Italian Game, the Caro-Kann, and whatever else you face regularly.

Club tournaments and league matches: 15-30 minutes of prep is usually enough. Check your opponent's recent games, identify their main openings, and prepare one line that gives you a comfortable position. Don't go crazy - you still need to play well after the opening.

Serious tournament games: 1-2 hours of preparation is reasonable for an important game. Go deeper into the lines, consider multiple scenarios, and have backup plans if your opponent deviates from their usual choices.

Professional play: This is a full-time job. Multiple hours with a team, engine preparation, novelty checking, and psychological profiling. If you're reading this article, you're probably not here yet, and that's fine.

Common Preparation Mistakes

Over-preparing. Spending 4 hours preparing against a 1200-rated opponent in a casual tournament is a waste. Your time is better spent studying general principles and tactics.

Preparing too many lines. If you try to prepare for every possible response, you'll remember none of them. Pick the most likely scenario and prepare that well. It's better to be deeply prepared for one line than superficially prepared for five.

Ignoring your own weaknesses. Preparation isn't just about exploiting your opponent. If you don't know what to do after 1.d4 d5 2.c4 e6 3.Nc3 Nf6, preparing a fancy anti-Sicilian isn't going to help you. Make sure your own repertoire doesn't have gaping holes first. Our guide on building an opening repertoire covers this in detail.

Changing your entire repertoire the night before. Switching from your trusted Ruy Lopez to the Evans Gambit because your opponent might not know it is a recipe for disaster. You'll be just as unfamiliar with the positions as they are, except they haven't been up until midnight studying.

Not writing it down. If you analyze at home and don't save the lines, you might as well not have prepared. Put your preparation somewhere you can review it - a Lichess study, a PGN file, or better yet, a drill-ready format in Openings.gg where you can quickly run through the lines before your game.

Building a Preparation System

The players who get the most out of pre-game prep are the ones with a system. Here's a simple one:

1. Maintain a database of your opponents' tendencies. If you play in a regular league or club, you'll face the same players repeatedly. Keep notes. "John always plays the London. Sarah switches between the Caro-Kann and the Scandinavian."

1. Build an anti-repertoire. For each common opening you face, have a go-to response that you know well. When someone plays the London System, you don't want to be figuring out your response from scratch every time.

1. Keep your preparation lines organized. Whether you use Lichess Studies, PGN files, or Openings.gg, have a place where your prepared lines live. Tag them by opponent or by the opening system they counter.

1. Review after the game. Did your preparation work? Did your opponent deviate where you expected? Update your notes for next time.

The Bottom Line

Pre-game preparation is a skill, and like any skill, it gets better with practice. You don't need grandmaster-level analysis or cutting-edge engine novelties. You need to know what your opponent plays, have a plan for how to meet it, and drill that plan until it's second nature.

Start simple. Before your next game, spend 15 minutes looking at your opponent's recent games. Pick one line to prepare. Drill it a few times. That alone puts you ahead of most amateur players who show up, play 1.e4, and hope for the best.

The opening is the one phase of chess where preparation directly translates to results. Don't leave that edge on the table.