Play Against Any Opening

You are here for one of two reasons. Either you just lost a game to something you didn't recognize and want to understand what happened before it happens again, or you know an opponent plays a particular system and you'd rather walk into the game with a plan than improvise one over the board. Both are the same problem from different angles: something your opponent chose, that you didn't choose, and now have to answer well.

Each page below is written from the defender's chair. It assumes you don't already know the opening's ideas and tells you, in order, what your opponent is trying to achieve, the specific way club players go wrong against it, and a concrete plan that doesn't require memorizing twenty moves of theory to execute.

Your opponent chose the opening

This is the case where your opponent had White and picked the fight. The classical tries after 1.e4 e5 are the ones you'll meet constantly at club level:

the Italian Game, the Ruy Lopez, and the Scotch Game all fight for the center directly and differ mainly in how they develop the light-squared bishop and when the center pawns get traded.

Less common but still dangerous in the same family: the Vienna Game and the King's Gambit both ask sharper, earlier questions, and the Four Knights Game is the quiet, symmetrical option a lower-rated opponent sometimes reaches for specifically to avoid theory — which is itself a fact worth knowing about the player across the board from you.

On the 1.d4 side, an opponent might steer for the full center fight with the Queen's Gambit, or avoid deep theory altogether with the London System or the Colle System — both built around a fixed setup that barely changes regardless of what you play. The Trompowsky Attack pins your knight before you've even chosen a structure, which unsettles players who expected a normal 1.d4 game.

And some opponents avoid the center altogether at move one: the English Opening, the Réti Opening, and Bird's Opening all approach from the flank, often deliberately, to sidestep whatever you'd prepared for 1.e4 or 1.d4.

You opened 1.e4 and Black answered sideways

If you play 1.e4 as White, most of your losses to an opening you didn't expect will come from Black declining 1...e5 entirely. This is the largest and most important group on the site, because it's the group you'll face most often.

The Sicilian Defense is what Black plays more than any other reply to 1.e4 at every level from club to grandmaster, and it produces the most unbalanced, double-edged positions of any of them. The French Defense and Caro-Kann Defense are calmer, structural choices with their own long-term plans, and the Scandinavian Defense grabs the center pawn immediately and dares you to punish an early queen move.

Three more come up regularly enough to matter: the Pirc Defense and Modern Defense both let you build a full center on purpose and plan to undermine it later, and the Alekhine's Defense invites you to chase the knight forward with tempo-gaining pawn moves — which is exactly the trap it's setting.

Even within 1...e5, Black sometimes avoids the main lines above on the very next move: the Petrov's Defense mirrors your own knight move back at you, and the Philidor Defense reinforces the center pawn with a move that looks passive and isn't.

You opened 1.d4 and Black refused the straight fight

Against 1.d4, the equivalent split is between Black taking on the center directly and Black inviting you to build a big one on purpose. The second group is enormous at club level, because it rewards understanding over memorization once you know what you're looking at.

The King's Indian Defense, Nimzo-Indian Defense, and Grünfeld Defense each let Black build up before striking at whatever center you build, but attack it in three genuinely different ways — a kingside pawn storm, an early pin followed by a doubled pawn, or pieces pressuring the center from a distance rather than pawns occupying it. The Bogo-Indian Defense is the Nimzo's quieter cousin, played when Black's move order doesn't allow the sharper option.

The Dutch Defense commits Black's kingside pawns forward early with attacking intent, the Benoni Defense trades a central pawn for a permanent space advantage on the queenside, and the Budapest Gambit offers a pawn back immediately for quick piece activity — it looks harmless and has embarrassed more than one unprepared 1.d4 player. The Slav Defense takes the center fight head-on, closer in spirit to the Queen's Gambit group above than to the hypermodern replies around it.

What's worth preparing versus what's worth looking up after

You do not need to study all thirty of these in advance, and trying to would be a poor use of study time. If you play 1.e4, knowing the shape of the Sicilian and one solid answer to the French and Caro-Kann covers the large majority of what you'll actually face — the others are worth a fast read the first time an opponent plays one against you, then filed away. If you play 1.d4, the King's Indian and one of the Slav or Queen's Gambit Declined structures matter most; the Dutch, Benoni, and Budapest Gambit are real but occasional.

The reverse question — what to prepare if you play Black — is really a question about your own opening choices rather than this section, since as Black you're deciding what to meet 1.e4 and 1.d4 with rather than reacting to an opponent's system. If you haven't settled that yet, start from the openings themselves rather than from this list. Once you have, come back here anyway: the strongest way to know your own repertoire is to read how an opponent is coached to meet it.

What each page actually gives you

Every page here leads with the mistake club players make against that specific opening most often — not a generic warning, but the concrete move or plan that lets that side of the board equalize or worse without a fight. From there it gives you a plan you can hold in your head rather than a memorized sequence, and calls out the one or two traps your opponent is quietly hoping you don't know about. Read the page once before you expect to face the opening again; you won't remember every detail, but the shape of the plan tends to stick, and it will come back to you the moment the position on the board starts to look familiar.

When your opponent's moves don't match the page you found

Chess openings transpose constantly, and club games rarely follow a textbook move order exactly. If your opponent's first few moves don't line up cleanly with any single page, look at the resulting pawn structure rather than the exact sequence that produced it — a Queen's Gambit reached through an unusual move order still behaves like a Queen's Gambit once the pawns are down. Don't assume you're facing something exotic just because the path there looked unfamiliar.

If you're not yet confident reading your opponent's moves quickly enough to identify what's happening, chess notation explained is worth ten minutes before you keep working through this section. And if you'd rather choose your own opening than keep reacting to your opponents', the opening picker quiz points you toward one that suits how you like to play.