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Open KGA: Bishop's Gambit

KGA: Bishop's Gambit

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An aggressive King's Gambit Accepted weapon — sac the f-pawn, develop Bc4, and play for a kingside crush. Deep coverage of 3…Qh4+ plus answers to 3…d5, 3…Nf6, 3…g5, 3…c6, 3…Ne7 and 3…b5.

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Open The London System

The London System

Official

A rock-solid d4 + Bf4 system you can play on autopilot against almost anything. Bf4, e3, c3, Bd3, Nbd2 — then strike with Ne5 and a kingside attack. 50 lines.

You play White
50 lines0% known
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Open Caro-Kann Defense

Caro-Kann Defense

Official

A Caro-Kann built around the c-pawn breaks — Black's freeing ...c5 in the Advance, and the Panov-Botvinnik c4/c5 structures. Solid, with active piece play. 18 lines.

You play Black
50 lines0% known
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Open King's Indian Defense

King's Indian Defense

Official

Hand over the center, then blow it up. The KID is the ultimate fighting answer to 1.d4 — Classical, Sämisch, Four Pawns, Averbakh, and Fianchetto. 50 lines.

You play Black
50 lines0% known
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Open Italian Game

Italian Game

Official

The classical 3.Bc4 — fast development, pressure on f7, and the c3+d4 center. Covers the Giuoco Piano, the Two Knights, and Black's sidesteps.

You play White
50 lines0% known
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Open King's Gambit

King's Gambit

Official

The romantic gambit, played properly: 2.f4 and 3.Nf3. The Kieseritzky (3...g5 4.h4 g4 5.Ne5) carries the main weight, with the Modern 3...d5, the Cunningham, the Falkbeer, and every declined system covered.

You play White
50 lines0% known
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Open Ruy Lopez

Ruy Lopez

Official

The Spanish torture: 3.Bb5 and long-term pressure on e5. Main-line Morphy structures plus the Berlin, the Exchange, and Black's early deviations.

You play White
50 lines0% known
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Open Queen's Gambit

Queen's Gambit

Official

2.c4 against everything — punish the Accepted, squeeze the Declined, meet the Slav head-on. The backbone of 1.d4 chess.

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50 lines0% known
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Open Vienna Game

Vienna Game

Official

2.Nc3 keeps every option open — then f4 hits like a delayed King's Gambit. The Vienna Gambit against ...Nf6 and Bc4 pressure against ...Nc6.

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50 lines0% known
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Open Scotch Game

Scotch Game

Official

3.d4 blows the center open on move three. Forcing, theory-light, and full of open lines — Kasparov's surprise weapon turned club favorite.

You play White
50 lines0% known
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Open Sicilian Najdorf

Sicilian Najdorf

Official

The sharpest scoring weapon in chess: ...c5, ...d6, ...a6 and a fight in every line. English Attack, Bg5, Be2, Bc4 — the big White tries, met head-on.

You play Black
50 lines0% known
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Open Sicilian Dragon

Sicilian Dragon

Official

The g7 bishop breathes fire down the long diagonal. Yugoslav Attack mains with ...Rc8 and ...d5 breaks, plus the Classical and every sideline.

You play Black
50 lines0% known
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Open French Defense

French Defense

Official

...e6 and ...d5: give White the center, then break it with ...c5 and ...f6. Winawer sharpness, Advance counterplay, Tarrasch clarity.

You play Black
50 lines0% known
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Open Queen's Gambit Declined

Queen's Gambit Declined

Official

...e6, ...Be7, ...O-O: the setup that's held up at every level for 150 years. Solid against the Exchange, active against Bg5 and Bf4 mains.

You play Black
50 lines0% known
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Open Nimzo-Indian Defense

Nimzo-Indian Defense

Official

...Bb4 pins, doubles White's pawns, and fights for e4 without touching the center. Every major White system met with a clear plan.

You play Black
50 lines0% known
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Open Slav Defense

Slav Defense

Official

...c6 keeps the light-squared bishop free and the structure granite. Main-line ...dxc4 with ...Bf5, plus the Exchange and early sidelines.

You play Black
50 lines0% known
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Open Grünfeld Defense

Grünfeld Defense

Official

Let White build the big center, then hit it with ...d5, ...c5 and the g7 bishop. The Exchange main line and every major try against it.

You play Black
50 lines0% known
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Open Sicilian Defense — White's Open Sicilian

Sicilian Defense — White's Open Sicilian

Official

The main-line answer to 1...c5: 2.Nf3 and 3.d4, meeting the Najdorf, Dragon, Taimanov and Kan setups. This is the White side — for playing the Sicilian as Black, see the Najdorf and Dragon courses.

You play White
50 lines0% known
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Open French Defense — White's Side

French Defense — White's Side

Official

How to meet 1...e6 as White: 3.Nc3 and the Steinitz, plus the Winawer, the Rubinstein and the exchange lines. This is the White side — for playing the French as Black, see the French Defense course.

You play White
50 lines0% known
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Open Caro-Kann — White's Advance

Caro-Kann — White's Advance

Official

How to meet 1...c6 as White: 3.e5 grabs space and 4.h4 goes straight at the light-squared bishop. This is the White side — for playing the Caro-Kann as Black, see the Caro-Kann Defense course.

You play White
50 lines0% known
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Open King's Indian — White's Classical

King's Indian — White's Classical

Official

How to meet the King's Indian as White: the Classical with Be2 and Be3, answering ...e5 and ...c5 breaks alike. This is the White side — for playing the KID as Black, see the King's Indian Defense course.

You play White
50 lines0% known
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Open Open Games — Black's 1...e5

Open Games — Black's 1...e5

Official

A complete 1...e5 answer to 1.e4: the Ruy Lopez, the Italian, the Scotch and the gambits, all from Black's side. The Black repertoire that was missing while every 1.e4 e5 course covered only White.

You play Black
50 lines0% known
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Open Scandinavian — White's Side

Scandinavian — White's Side

Official

How to meet 1...d5 as White: 2.exd5 Qxd5 3.Nc3 gains the tempo, then take the centre. Pairs with the Scandinavian bishop-hunt trap.

You play White
50 lines0% known
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Open Pirc & Modern — White's Side

Pirc & Modern — White's Side

Official

How to meet 1...d6 and the Modern as White: 2.d4 and 3.Nc3, building the big centre Black invites you to build, then proving it.

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50 lines0% known
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Open Queen's Gambit Accepted

Queen's Gambit Accepted

Official

Take the pawn and give it back on your terms: 2...dxc4, then ...Nf6, ...e6 and a timely ...c5 to free the position. Black's side.

You play Black
50 lines0% known
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Open English Opening

English Opening

Official

1.c4 — the flank opening that keeps the centre in reserve. Meets ...e5, ...c5 and ...Nf6 setups, and transposes into d4 structures on your terms.

You play White
50 lines0% known
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Open English — Black's Side

English — Black's Side

Official

How to meet 1.c4 as Black. The library had no answer to it at all, which meant a repertoire could look complete and leave you with nothing against one of the four most common first moves.

You play Black
50 lines0% known
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Open Réti — Black's Side

Réti — Black's Side

Official

How to meet 1.Nf3 as Black. Like the English, it was entirely uncovered — and it is the move most likely to transpose somewhere you have not prepared.

You play Black
50 lines0% known
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Open Alapin Sicilian — White's Side

Alapin Sicilian — White's Side

Official

Meet the Sicilian with 2.c3, build the big centre with d4, and play a normal game a tempo up in development. No Najdorf theory, no Dragon, no memorising twenty move orders — one system against everything.

You play White
50 lines0% known
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Open French: Wing Gambit

French: Wing Gambit

Official

Against the French, grab space with 3.e5 and then answer the ...c5 break by throwing a wing pawn at it: 4.b4! It takes the French player straight out of everything they have studied, and White scores 54% with it at club level. Tricky rather than refuting — which is the point.

You play White
50 lines0% known
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Open Leningrad Dutch

Leningrad Dutch

Official

Answer 1.d4 with 1...f5 and fianchetto: ...Nf6, ...g6, ...Bg7, ...O-O, ...d6. Black takes the kingside space the Dutch is played for and keeps the ...e5 break in hand. Includes the Hopton Attack (2.Bg5), which is what you actually meet most often.

You play Black
30 lines0% known
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Open Evans Gambit

Evans Gambit

Official

4.b4! — offer a wing pawn to rip open the centre with c3 and d4 while the bishop is still deciding where to stand. The most famous attacking gambit in chess, and it still scores.

You play White
50 lines0% known
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Open Smith-Morra Gambit

Smith-Morra Gambit

Official

Meet the Sicilian by giving up a pawn for the c3- and d-files. White develops fast, Black is behind, and the positions are far easier to play from White's side than the book says.

You play White
50 lines0% known
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Open Danish Gambit

Danish Gambit

Official

Two pawns for two raking bishops on the long diagonals. Black can take both, decline with 3...Qe7, or hand one back with 3...d5 — all three are here.

You play White
50 lines0% known
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Open Budapest Gambit

Budapest Gambit

Official

Answer 1.d4 with 2...e5, throwing a pawn at the centre on move two. White keeps it with 3.dxe5 Ng4 and then has to survive the knight coming back — this is where the Kieninger Trap lives.

You play Black
50 lines0% known
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Open Albin Countergambit

Albin Countergambit

Official

Meet the Queen's Gambit with 2...e5, and after 3.dxe5 push 3...d4 — a pawn down with a wedge on d4 that cramps White for the whole game. Home of the Lasker Trap.

You play Black
50 lines0% known
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Open King's Gambit: the Cunningham Bishop

King's Gambit: the Cunningham Bishop

Trap

4...Bh4+ looks like a free hit — it drives your king to f1. But the bishop now stands on h4 attacked by the knight on f3, and 5...Nf6?? loses it to 6.Nxh4. The most-played mistake anyone makes against this opening.

You play White
Wins material
9 lines0% known
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Open King's Gambit: the Qc6 Skewer

King's Gambit: the Qc6 Skewer

Trap

The Modern Defence 3...d5 gives the pawn back to free the position. After 4.exd5 Qxd5 5.Nc3 the queen is attacked and 5...Qc6?? picks the one square that loses her — 6.Bb5 pins the queen to the king.

You play White
Wins the queen
9 lines0% known
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Open King's Gambit: h6 and the Rook Lift

King's Gambit: h6 and the Rook Lift

Trap

Against 3...g5 you play 4.h4 and the g5 pawn is already loose. 4...h6 defends it — but 5.hxg5 hxg5?? forgets that the h-file opens with a rook staring down it. 6.Rxh8 wins a rook, and often a second one on f8.

You play White
Wins material
9 lines0% known
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Open Caro-Kann: the Ne5 Overreach

Caro-Kann: the Ne5 Overreach

Trap

In the Exchange Caro-Kann, White pins with 5.Bb5 and then reaches for 6.Ne5 to make something of it. The knight is just hanging — 6...Nxe5 7.dxe5 Bxb5 leaves you a clean piece up.

You play Black
Wins a piece
9 lines0% known
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Open Caro-Kann Fantasy: the ...e5 Battery

Caro-Kann Fantasy: the ...e5 Battery

Trap

Meet the Fantasy Variation 3.f3 by striking with 3...e5. After 4.dxe5 the queen goes to b6 — not d6, which hangs to exd6 — and lines up with the bishop on c5 against f2. The natural 5.Bc4? already loses material.

You play Black
Wins material
9 lines0% known
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Open Caro-Kann: Fantasy Variation Trap

Caro-Kann: Fantasy Variation Trap

Trap

Against the Fantasy Variation (3.f3), 4...e5! hits the center; White's greedy 5.dxe5?? loses to 5...Qh4+, when 6.Ke2 Qxe4+ or 6.g3 Qxe4+ wins by force.

You play Black
Checkmate
12 lines0% known
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Open Caro-Kann: Panov — the ...Bb4 Pin

Caro-Kann: Panov — the ...Bb4 Pin

Trap

In the Panov, 6...Bb4 pins the Nc3; White's natural 7.b3?? leaves the knight undefended, and 7...Bxc3+ 8.Bd2 Bxa1 wins knight and rook for the bishop.

You play Black
Wins the queen
11 lines0% known
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Open King's Gambit: Allgaier Trap

King's Gambit: Allgaier Trap

Trap

White's Allgaier knight sac 5.Ng5 and 6.Nxf7+ overreaches — after ...Kxf7 Black returns the pawns and keeps a whole piece; the sound 5.Ne5 only draws.

You play Black
Wins a piece
10 lines0% known
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Open King's Gambit: Salvio Trap

King's Gambit: Salvio Trap

Trap

In the Salvio Gambit White's greedy 7.Nxf7 (or any capture on f7/g4) runs into ...Nxf7 and drops a piece; only the retreat 7.d4 and 8.Nd3 holds equality.

You play Black
Wins the queen
11 lines0% known
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Open King's Indian: Exchange — Punishing 9.Nxe5

King's Indian: Exchange — Punishing 9.Nxe5

Trap

White snatches the e5 pawn with 9.Nxe5?; 9...Nxe4! unveils the g7-bishop and hits the c3-knight, and a knight retreat runs into ...Nxc3 and ...Bxc3+ winning the a1-rook.

You play Black
Wins a piece
11 lines0% known
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Open King's Indian: Sämisch — the ...Nxg3 Shot

King's Indian: Sämisch — the ...Nxg3 Shot

Trap

In the Samisch, 8.Qd2 Qh4+ 9.g3 invites 9...Nxg3!; the natural 10.hxg3 opens the h-file for 10...Qxh1, winning the rook, and declining still drops the f1-bishop.

You play Black
Wins a piece
11 lines0% known
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Open Caro-Kann: Réti–Tartakower Trap

Caro-Kann: Réti–Tartakower Trap

Trap

After 4...Nf6 5.Qd3, Black's premature 5...e5?? runs into 8.O-O-O and the crushing 9.Qd8+!! queen sacrifice mating by force; declining with 5...Nxe4 keeps Black safe but hands White an easy game.

You play White
Checkmate
11 lines0% known
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Open Caro-Kann: Smothered Mate Trap

Caro-Kann: Smothered Mate Trap

Trap

In the 4...Nd7 line, 5.Qe2 threatens 6.Nd6#; Black's natural 5...Ngf6?? allows it, while the correct 5...Ndf6 leaves White comfortably better.

You play White
Checkmate
10 lines0% known
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Open Scandinavian: the g4 Bishop Hunt

Scandinavian: the g4 Bishop Hunt

Trap

After 5...Bg4 6.h3 Bh5, White plays 7.g4 — and Black's natural-looking 7...Nxg4?? sacrifice is unsound: 8.hxg4 Bxg4 leaves Black a piece down for two pawns with no attack. 7...Bg6 is the move.

You play White
Wins the queen
12 lines0% known
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Open Sicilian: Magnus Smith Trap

Sicilian: Magnus Smith Trap

Trap

Black's Dragon-style 6...g6 in the Fischer-Sozin lets White play 7.Nxc6 bxc6 8.e5, when the natural 8...dxe5 loses the queen to 9.Bxf7+ Kxf7 10.Qxd8.

You play White
Wins a piece
12 lines0% known
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Open Sicilian: Nxe4 Fork Trap

Sicilian: Nxe4 Fork Trap

Trap

In the c3-Sicilian, snatching the loose e4-pawn with 4...Nxe4?? runs into 5.Qa4+, a double attack that forks Black's king and stranded knight and wins it with 6.Qxe4.

You play White
Wins a piece
11 lines0% known
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Open Queen's Gambit Declined: Elephant Trap

Queen's Gambit Declined: Elephant Trap

Trap

In the QGD, White's greedy 6.Nxd5?? runs into 6...Nxd5! 7.Bxd8 Bb4+ — the check comes with tempo and Black emerges a clean piece up.

You play Black
Wins material
13 lines0% known
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Open Albin Countergambit: Lasker Trap

Albin Countergambit: Lasker Trap

Trap

The famous underpromotion. After 4.e3?? Bb4+ 5.Bd2 dxe3, White's natural 6.Bxb4 allows 6...exf2+ 7.Ke2 fxg1=N+! — a knight, not a queen, winning material.

You play Black
Wins the queen
15 lines0% known
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Open Blackburne Shilling Gambit

Blackburne Shilling Gambit

Trap

3...Nd4 offers the e5 pawn. 4.Nxe5 is playable for White — but the greedier 5.Nxf7?? loses on the spot to 5...Qxg2 6.Rf1 Qxe4+ 7.Be2 Nf3#.

You play Black
Checkmate
13 lines0% known
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Open Legal's Mate

Legal's Mate

Trap

The oldest trap worth knowing: 5.Nxe5! offers the queen, and 5...Bxd1?? is mated by 6.Bxf7+ Ke7 7.Nd5#. Black must decline — but then White has simply won a pawn.

You play White
Checkmate
13 lines0% known
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Open Ruy Lopez: Noah's Ark Trap

Ruy Lopez: Noah's Ark Trap

Trap

After 5.d4 b5 6.Bb3 Nxd4 7.Nxd4 exd4, White's natural 8.Qxd4?? walks into 8...c5 and 9...c4 — the b3 bishop is boxed in by a wall of pawns and cannot escape.

You play Black
Wins material
10 lines0% known
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Open Budapest Gambit: Kieninger Trap

Budapest Gambit: Kieninger Trap

Trap

In the Budapest, 7.a3?? invites 7...Ngxe5 — and when White grabs the bishop with 8.axb4, 8...Nd3 is smothered mate on the board.

You play Black
Checkmate
10 lines0% known
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Open Ruy Lopez: Fishing Pole Trap

Ruy Lopez: Fishing Pole Trap

Trap

4...Ng4 5.h3 h5!? dangles the knight as bait. 6.hxg4?? opens the h-file onto White's king and Black mates. It is a genuine gamble though: if White declines, Black is about a pawn and a half worse — those lines are included rather than hidden.

You play Black
Wins the queen
10 lines0% known
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Open Smith-Morra: Siberian Trap

Smith-Morra: Siberian Trap

Trap

In the Smith-Morra Accepted, 9...Nd4 hits the queen — and White's natural 10.Nxd4?? allows 10...Qh2 mate, the queen slipping in behind the pawn wall.

You play Black
Checkmate
10 lines0% known
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Open Caro-Kann Fantasy: the ...Qb6 Battery

Caro-Kann Fantasy: the ...Qb6 Battery

Trap

Against the Fantasy (3.f3), 3...Qb6 hits b2 and d4 together. After 4.Nd2 e5, the natural grab 5.dxe5?? runs into 5...Bc5 — d4 has vanished, f2 is pinned, and the g1 knight is stuck. Note it needs 4.Nd2: against 4.Nc3 the same plan does not work.

You play Black
Wins a piece
14 lines0% known
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