Alekhine’s Defense spans ECO codes B02 to B05, and the variation tree is really a question of one thing: how greedy does White want to be? White can grab a giant pawn center, develop modestly, or just clarify things with a trade — and each choice gives the game a totally different flavor. Here’s the map.
The variations at a glance
Variation Key moves Personality Who it favors Four Pawns Attack 4.c4 Nb6 5.f4 Maximum space, sharp Double-edged Modern (Main Line) 4.Nf3 Sound, flexible Slight pull, White Exchange 4.c4 Nb6 5.exd6 Clean, low-risk Small edge, White Chase / Two Pawns 3.c4 Nb6 4.c5 Aggressive chasing Double-edged 2.Nc3 sideline 2.Nc3 (often d5) Transpositional Balanced
The Four Pawns Attack (4.c4 Nb6 5.f4) — maximum space
This is White at full throttle. After 4.c4 Nb6 5.f4, White builds a pawn wall on c4, d4, e5, and f4 — about as much space as you can grab in the opening.
It looks terrifying, and against a passive opponent it is. But Alekhine’s Defense was designed to meet exactly this — Black hits back immediately:
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Striking back in the Four Pawns — ...dxe5, ...Nc6, and ...Bf5 immediately pressure d4 and e5.
The core idea: with …dxe5, …Nc6, …Bf5 (and later …e6, …Be7, …f6), Black swarms the d4- and e5-pawns. If White’s center holds, the space crushes Black; if it cracks, those advanced pawns become weaknesses. Genuinely sharp and double-edged — the most exciting line in the opening.
The Modern (Main) Line (4.Nf3)
Today’s most respected approach. Instead of over-grabbing, White just develops and keeps a sound space edge.
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The Modern main line after 5.Nxe5 — White trades off the tension and keeps a healthy, flexible position.
The idea: White declines the gamble. By developing first, White avoids handing Black the overextended center Alekhine’s lives off. Black equalizes with sensible play (…g6, …Bg7, …c6, …Nd7) but doesn’t get the juicy targets the Four Pawns offers. This is the line that gives Alekhine players the fewest cheap chances — and it’s exactly why it’s the modern main road. (See the move-by-move guide for the step-by-step.)
The Exchange Variation (4.c4 Nb6 5.exd6)
White grabs a little space, then simply clarifies the center: 4.c4 Nb6 5.exd6.
Black recaptures with 5…cxd6 (active, opening the c-file) or 5…exd6 (super-solid). Either way, White avoids all the overextension risk and settles for a small, comfortable space advantage with normal development (Nc3, Be2/Bd3, Nf3, O-O). It’s the choice for a low-theory, no-nonsense game — roughly a modest pull for White, very playable for both.
The Chase Variation (3.c4 Nb6 4.c5)
Some players can’t resist chasing the knight even harder. After 3.c4 Nb6 4.c5, White shoves the knight a third time.
It looks aggressive, but every chase costs White tempi and over-commits pawns. Black calmly retreats — 4…Nd5 5.Bc4 e6 — and then attacks the overstretched pawn chain:
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Meeting the Chase — Black retreats the knight to d5 and prepares to undermine White's loose pawn chain with ...d6 and ...b6.
This is the Alekhine philosophy in its purest form: the more pawns White chases with, the more targets Black gets. Double-edged, and a trap for the over-eager (more on that in the traps page).
The 2.Nc3 sideline
Instead of 2.e5, White can develop with 2.Nc3. This often just transposes — for instance 2…d5 3.e5 Nfd7 reaches a French-flavored structure, while 2…e5 would head into open-game waters.
It’s a way for White to dodge Alekhine theory entirely, leading to balanced, slightly different positions. Know that …d5 is a clean equalizer and you won’t be surprised.
So which variation should you study?
- Playing Black and want the full Alekhine experience? Get your antidote to the Four Pawns Attack ready — it’s the sharpest and most dangerous if you’re unprepared.
- Facing the Modern (4.Nf3)? Learn the calm …g6/…Bg7 setup; it’s the line you’ll see most from strong opponents.
- Surprised by the Chase (4.c5) or 2.Nc3? Know the simple, principled retreats and equalizers and you’ll be fine.
Curious how White tries to crack Alekhine’s Defense? See how to beat Alekhine’s Defense. And don’t miss the traps page — these chasing lines hide some nasty tricks both ways.
FAQ
What is the most aggressive line against Alekhine’s Defense? The Four Pawns Attack (4.c4 Nb6 5.f4), where White grabs maximum space with four advanced pawns. It’s sharp and double-edged — crushing if Black is passive, but full of targets if Black hits back.
What is the main line of Alekhine’s Defense? The Modern line with 4.Nf3 is today’s most respected approach — White develops sensibly and keeps a sound space edge rather than overextending.
What is the Exchange Variation? After 4.c4 Nb6 5.exd6, White trades off the central tension. Black recaptures with …cxd6 or …exd6, and White settles for a small, low-risk space advantage.
Is the Four Pawns Attack good for White? It’s a real test — White gets enormous space — but it’s double-edged, not a refutation. If Black plays accurately with …dxe5, …Nc6, and …Bf5, the big center can become a liability.
Keep climbing
If the names are blurring together, anchor yourself with the Alekhine’s Defense overview and the broader opening principles. Then return to the openings hub to compare Alekhine’s with another offbeat surprise weapon, the Scandinavian Defense.
Written and fact-checked by the Chess Lab Academy Editorial Team (AI-assisted, human-edited) · Lines checked against mainstream opening theory and verified with Stockfish 17 · ECO B02–B05 · Last verified 2026-06-25 · Sources · How we verify content.