ECO Volume C · C00–C99
Volume C — Open Games & the French
The oldest battlegrounds in chess — the Ruy Lopez, Italian Game, Scotch and King's Gambit — plus the entire French Defence complex. 1.e4 e5 classics & the French Defence.
Classical Game Deep Lines
C60More named sub-variations of the open games: Morphy Defence sub-lines, Italian regroupings, Scotch structures and the romantic gambit continuations that fill out the theory tree.
French Defence
C00The French Defence is the opening of strategic counterpunchers: Black invites White to build a big centre, then spends the whole game hammering at it. The bad bishop on c8 is a small price for the healthiest structure in chess — Botvinnik, Korchnoi and Morozevich all made it their life's work.
French Defence
C00Black invites White to build a big centre, then spends the game hammering at it — the opening of strategic counterpunchers.
French Defence: Winawer Variation
C15The sharpest French: bishop pair sacrificed to wreck White's pawns and hunt the initiative.
French, Winawer Variation
C15The sharpest French line: Black gives the bishop pair to wreck White's pawns and fights with piece play against the doubled c-pawns.
Italian Game
C50The Italian Game is where most players fall in love with chess — and where the modern elite now spend their theory budgets. The Giuoco Pianissimo squeezes are the new main lines: slow, rich, and full of long-term plans that reward deep understanding.
Italian Game
C50Steinitz's original defence: ...d6 solidifies e5 — passive but principled, with clear structural logic.
Italian Game: Giuoco Pianissimo
C50The modern main line: both sides manoeuvre for twenty moves before a single queenside pawn moves.
King's Knight Opening
C40The full Evans complex: castling into open lines, d4 tension and piece swarms for the pawn.
King's Pawn Game
C20The umbrella over all 1.e4 e5 lines without an early Bc4/Bb5 — home of the Centre Game, King's Knight Opening and more.
Ruy Lopez
C60The Ruy Lopez is chess's cathedral — every world champion has prayed here. White's bishop pins the c6-knight against the e5 pawn, building the slow, inexorable squeeze that made Capablanca, Fischer and Karpov immortal. Black has a dozen rich defensive systems, from Kramnik's Berlin Wall to Kasparov's Marshall Attack.
Ruy Lopez
C60The Spanish Game — 500 years old, the deepest opening in chess, the main battleground of nearly every world championship match.
Ruy Lopez, Berlin Defence
C65The Berlin Wall — Kramnik's engine-proof fortress that toppled Kasparov in 2000.
Ruy Lopez, Morphy Defence
C70The main Open Ruy tabiya: c3/d4 support, Nd4-f5 ideas and Black's ...Be6 consolidation.
Ruy Lopez: Berlin Defence
C65The Berlin: Black grabs e4 and shortcuts theory — from Open lines to the endgame Wall.
Ruy Lopez: Berlin Wall
C67The endgame fortress that beat Kasparov: bishop pair and structure versus everything.
Ruy Lopez: Closed Defence
C84The classical main line for a century: knight dances, h3 preparation, the d4 break.
Ruy, Closed Defence
C84The Chigorin — a century of world championship battles: ...Na5/...c5 queenside pressure versus White's d4 break.
Ruy, Closed, 9.h3
C92The Breyer setup: ...Bb7, ...Re8 and the knight waiting on b8 — the deepest of all Closed Ruy structures.
Ruy, Morphy Defence, 5.O-O
C78The main Ruy move order: castling first, then Re1/h3/c3 — the gateway to every Closed Spanish system.
Scotch Game
C45The Scotch opens the centre immediately and trades pawn tension for free piece play — straightforward plans, minimal theory, fighting chances forever. Kasparov's 1990s weapon of choice and the perfect classical opening for club players.
Scotch Game
C45The Scotch opens the centre at once and trades pawn tension for free piece play — Kasparov's 1990s weapon of choice.
Classical Game Deep Lines: Italian, 3...Nf6 Setup
C55The Two Knights move order: counterattacking e4 at once.
Classical Game Deep Lines: Ruy, Berlin Wall 9.Nc3
C67The Nc3 development: the Berlin endgame's main line.
French Defence: Advance Variation
C02The Milner-Barry battleground: e5 space versus the ...c5/...Qb6 hits on d4 and b2.
French Defence: Classical Variation
C11The Steinitz setup: the c5/e5 tension with ...Qb6 pressure on b2 and d4.
French Defence: Tarrasch Variation
C03Tarrasch's system: the wedge without the Winawer pin — deep positional battles.
French Defence: Winawer Poisoned Pawn
C19The French's own Poisoned Pawn: ...Qc7 sidesteps g4 raids and counterattacks.
French, Advance Variation
C02The Milner-Barry battleground: White's e5 wedge gains space while Black targets d4 and b2 — forcing and trap-rich.
French, Classical Variation
C11The classical Steinitz setup: ...Nfd7 development, the c5/e5 tension and queenside play against White's space.
French, Tarrasch Variation
C03Tarrasch's anti-French system: the d4-e5 wedge without the Winawer pin — deep positional battles around d4.
French, Winawer, Advance Variation
C16The Qg4 raid: White immediately attacks g7 while Black hunts the c3/c4 pawns — mutual chaos from move seven.
French, Winawer, Poisoned Pawn
C19The French's own Poisoned Pawn: Black sidesteps the g4 raid and builds the ...Qc7/...Nbc6 counterattack.
Giuoco Piano
C53The Quiet Game is anything but: the classical d4 break leads to Møller-style attacks and famous piece sacrifices.
Giuoco Piano, Main Line
C54The main Giuoco Piano: the Nxe4 grab, the O-O piece sacs and White's raging initiative down the open lines.
Italian Game: Giuoco Piano, Main Line
C53The romantic main line: the d4 break, the pin, and the famous piece sacrifices.
Italian Game: Italian, 4.d3 Main
C50The Re1 build-up: the classical prelude to the d4 break at maximum safety.
Italian Game: Two Knights Defence
C55The solid treatment: d3 keeps the bishop safe and the plans slow.
Marshall Attack
C89The greatest pawn sacrifice in opening history: ...d5 crashes through and Black's pieces swarm the kingside.
Open Game Deep Lines
C60The deep-line archive of Volume C: named sub-variations of the Ruy Lopez, Italian, French, Scotch, King's Gambit and the romantic gambits — the lines that decide real games once both players know the first ten moves.
Open Game Deep Lines: Italian, Pianissimo 8.a4 Setup
C50The a4/Ba7 structure: the modern Pianissimo battleground.
Open Game Deep Lines: Ruy, Open 7.Bb3 Main
C80The main Open Ruy tabiya: material balance with sharp middlegames.
Ruy Lopez, Berlin, Open Variation
C67The Berlin endgame: queens off, bishop pair for Black, fortress for the ages — the 2000 match decider.
Ruy Lopez, Exchange Variation
C68White wrecks Black's queenside structure at once and plays the long game — the eternal Spanish squeeze.
Ruy Lopez: Breyer Variation
C94The knight returns to b8! Passive-looking, hyper-solid — Petrosian's fortress.
Ruy Lopez: Chigorin Variation
C96A century of world championship battles: ...Na5/...c5 versus the d4 break.
Ruy Lopez: Exchange Variation
C68The structure war: broken queenside pawns versus the bishop pair — a game of centuries.
Ruy Lopez: Marshall Attack
C89The greatest pawn sacrifice in opening history: ...d5 crashes through for eternal initiative.
Ruy Lopez: Open Variation
C80The Open Ruy: e4 grabbed, compensation proven — the sharpest classical lines.
Ruy Lopez: Zaitsev Variation
C92Zaitsev's ...Bb7: Karpov's lifetime weapon, theory-rich and strategically deep.
Ruy, Closed, 6.Re1 d6
C87The Closed main tabiya: ...Na5 hits Bb3 while White prepares d4 — the Chigorin complex begins.
Ruy, Closed, Breyer Defence
C94The Breyer: the knight returns to b8! Passive-looking, hyper-solid — Petrosian's fortress and a modern elite choice.
Ruy, Closed, Breyer, 10.d4
C95The Breyer main tabiya: the d7-knight covers c5 and e5 while both sides manoeuvre.
Ruy, Closed, Chigorin Variation
C96The Chigorin — a century of world championship battles: ...Na5/...c5 queenside pressure versus White's d4 break.
Ruy, Closed, Chigorin, Main Line
C97The classical Chigorin tabiya: ...Qc7 regrouping and knight manoeuvres decide the strategic squeeze.
Ruy, Open Variation
C80The Open Ruy: Black grabs e4 and dares White to prove compensation in the sharpest classical lines.
Scotch Game: Classical Variation
C45The classical main line: ...Qf6 pressure versus c3/Be3 solid development.
Scotch Game: Mieses Variation
C45The full Schmidt tabiya: c4/Nd5 tension and the eternal e5 wedge.
Scotch Game: Schmidt Variation
C45The Schmidt: the e5 wedge and the structural squeeze after Nxc6.
Two Knights Defence
C55Black counterattacks e4 at once with 3...Nf6 — gateway to the Fried Liver, the Traxler and famous traps.