ECO volume A
ECO A openings
Flank openings (1.c4, 1.Nf3, irregular). This volume contains 805 exact named move-order records in the reference catalogue. The 10 guides below concentrate on the major families: their characteristic structures, plans for both sides, pawn breaks, piece placement, tactical warnings, and the practical differences between branches.
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Benko Gambit Accepted
The accepted Benko through Black’s half-open a- and b-files, White’s extra pawn and d5 centre, the ...e6 counterbreak, queenside piece pressure, and the main ways to return the pawn.
ECO coverage in this volume: A57, A58, A59 · 10 exact move-order records
Benoni Defense
The Benoni through White’s d5–e4 centre, Black’s queenside majority, the ...b5 and ...f5 breaks, and the contrast between Modern and Czech structures.
ECO coverage in this volume: A40, A43, A44, A56, A60 … A76, A77, A78, A79 · 61 exact move-order records
Dutch Defense
A guide to the Dutch through its early ...f5 commitment, the e4 and ...e5 breaks, Stonewall outposts, Leningrad pressure, and the problem of the c8-bishop.
ECO coverage in this volume: A80, A81, A82, A83, A84 … A96, A97, A98, A99 · 68 exact move-order records
English Opening
Understand the English Opening by structure: reversed Sicilian positions, symmetrical systems, Hedgehog setups, central transpositions, and the timing of d4 and e4.
ECO coverage in this volume: A10, A11, A13, A14, A15 … A36, A37, A38, A39 · 165 exact move-order records
Grünfeld Defense
The Grünfeld through pressure on White’s pawn centre, the ...c5 counterstrike, the g7 diagonal, and the tactical targets on d4 and c3.
ECO coverage in this volume: A56 · 1 exact move-order record
King's Indian Attack
The King’s Indian Attack as a structure rather than a script: the e4–e5 advance, kingside piece routes, c4 and ...c5 breaks, and the adjustments required by Black’s centre.
ECO coverage in this volume: A05, A07, A08 · 20 exact move-order records
London System
The London System through its d4–e3–c3 triangle, the e4 and c4 breaks, Black’s ...c5 and ...Qb6 pressure, and the adjustments required against a kingside fianchetto.
ECO coverage in this volume: A48 · 3 exact move-order records
Modern Defense
The Modern Defense through its delayed knight development, the flexible ...c5, ...e5, and ...d5 breaks, and White’s choices between central space and rapid attack.
ECO coverage in this volume: A04, A40, A41, A42 · 11 exact move-order records
Réti Opening
The Réti Opening through pressure on d5, the choice between d4 and a flank centre, Advance and Accepted structures, and common Anglo-Slav transpositions.
ECO coverage in this volume: A09, A11, A12, A14 · 43 exact move-order records
Trompowsky Attack
The Trompowsky Attack through the 2.Bg5 pin, doubled-f-pawn choices after Bxf6, the ...Ne4 bishop chase, and the e4, ...c5, and ...d5 breaks.
ECO coverage in this volume: A45 · 10 exact move-order records