Danish Gambit: Accepted & Schlechter Defense (C21)

ECO C21 · Vol.06 · Ch.2 · 1. e4 e5 2. d4 exd4 3. c3

EPD: rnbqkbnr/pppp1ppp/8/8/3pP3/2P5/PP3PPP/RNBQKBNR b KQkq - · Eval +0.14

Popularized by Danish master Martin Severin From in the 1860s and adored by Frank Marshall, Joseph Henry Blackburne, and Alexander Alekhine, the Danish Gambit (C21: 1. e4 e5 2. d4 exd4 3. c3) sacrifices up to two pawns to slice the board in half. After 3...dxc3 4. Bc4 cxb2 5. Bxb2, White's light-squared c4-bishop and dark-squared b2-bishop rake f7 and g7 side-by-side—forcing Black to know either Sörensen's immediate 3...d5! or Schlechter's clinical 5...d5! counter-sacrifice.

Two raking bishops on c4 and b2 look terrifying, yet Otto knows Carl Schlechter's secret antidote: give one pawn right back with ...d5! to unplug both diagonals!

Historical Origins & Pawn-Structure DNA

16th-Century Lucena & 19th-Century Nordic Gambit Masters (von der Lasa, Lindehn) · Wide-Open Central Diagonals & Rapid Queenside Castling · Bent Larsen, Jacques Mieses, Judit Polgár, Ian Nepomniachtchi

Mentioned as early as Lucena's 1497 print and sharpened by Scandinavian masters in the 1860s, these direct 1. e4 e5 sidelines remain favorite surprise weapons for creative attackers seeking Asymmetric territory from move two.

With 2. Bc4 White avoids 2...Nf6 Petrov lines while keeping f4 and d3 options open; in the Center and Danish systems, White willingly sacrifices pawn material or early queen tempo to blast open the a3–f8 and a2–g8 diagonals before Black castles.

White's Strategic Blueprint

Full Danish Accepted: after 3...dxc3 4. Bc4 cxb2 5. Bxb2, follow with Nf3, O-O, Nc3, and Qb3/Re1 to suffocate f7 and g7 before Black untangles.
Half-Danish Practical Choice: after 3...dxc3, recapture 4. Nxc3! (Göring-style), sacrificing just one pawn for clean knight development and Nd5 outposts.
Against Sörensen's 3...d5!, capture 4. exd5 Qxd5 5. cxd4 Nc6 6. Nf3, embracing a dynamic Isolated Queen's Pawn initiative.

Black's Counterplay & Breaks

Schlechter's Antidote: accept 3...dxc3 4. Bc4 cxb2 5. Bxb2, then strike 5...d5! 6. Bxd5 Nf6 7. Bxf7+ Kxf7 8. Qxd8 Bb4+! 9. Qd2 Bxd2+ 10. Nxd2 for dead equality.
Sörensen Defense: decline greed immediately on move three with 3...d5! 4. exd5 Qxd5 (or 4...Nf6), reaching a sound IQP battleground with zero kingside risk.
Calm Queen Blockade: play 3...Qe7 (or 3...Ne7 Svenonius Defense) to attack e4 and force White to slow down before open diagonals ignite.

Common Club Traps & Mistakes

Grabbing both pawns with 3...dxc3 4. Bc4 cxb2 5. Bxb2 and playing passive 5...d6?! or 5...Nc6?! lets White's twin bishops and 6. Qb3/Nf3 crush f7 and g7.
In Schlechter's line (5...d5! 6. Bxd5 Nf6), missing Black's discovered check 7. Bxf7+ Kxf7 8. Qxd8 Bb4+! leaves unsuspecting club players stunned when Black wins the queen right back!

Canonical ECO Sub-Variations

C21 Danish Gambit: 1. e4 e5 2. d4 exd4 3. c3 (rnbqkbnr/pppp1ppp/8/8/3pP3/2P5/PP3PPP/RNBQKBNR b KQkq -)
C21 Danish Gambit Accepted: 1. e4 e5 2. d4 exd4 3. c3 dxc3 (rnbqkbnr/pppp1ppp/8/8/4P3/2p5/PP3PPP/RNBQKBNR w KQkq -)
C21 Center Game: Halasz-McDonnell Gambit: 1. e4 e5 2. d4 exd4 3. f4 (rnbqkbnr/pppp1ppp/8/8/3pPP2/8/PPP3PP/RNBQKBNR b KQkq f3)
C21 Center Game: Lanc-Arnold Gambit: 1. e4 e5 2. d4 exd4 3. Nf3 Bc5 4. c3 (rnbqk1nr/pppp1ppp/8/2b5/3pP3/2P2N2/PP3PPP/RNBQKB1R b KQkq -)
C21 Danish Gambit Accepted: Classical Defense: 1. e4 e5 2. d4 exd4 3. c3 dxc3 4. Bc4 cxb2 5. Bxb2 Nf6 (rnbqkb1r/pppp1ppp/5n2/8/2B1P3/8/PB3PPP/RN1QK1NR w KQkq -)
C21 Danish Gambit Accepted: Svenonius Defense: 1. e4 e5 2. d4 exd4 3. c3 Ne7 (rnbqkb1r/ppppnppp/8/8/3pP3/2P5/PP3PPP/RNBQKBNR w KQkq -)

FAQ

How does Black recover the queen after 6. Bxd5 Nf6 7. Bxf7+ Kxf7 8. Qxd8 in Schlechter's Defense?

With the brilliant check 8...Bb4+!—since White's queen on d8 is attacked by Black's c8-rook, White is forced to interpose 9. Qd2 Bxd2+ 10. Nxd2, reaching an equal endgame!

Why do many modern attackers prefer 4. Nxc3 over the classic double-pawn 4. Bc4?

Because 4. Nxc3! sidesteps Schlechter's 5...d5 endgame liquidation completely, keeping queens on the board with a dangerous Smith-Morra-like lead in development.

What is the safest single move for Black if they haven't studied 5...d5?

Sörensen's 3...d5! refuses the c3-bait altogether and converts the game into a straightforward, comfortable Alapin/Scandinavian-style IQP position.

Grandmasters Who Weaponized This Technique

Garry Kasparov (RUS · 2851 FIDE) — 13th World Champion · Master of Dynamic Initiative & Deep Prep
Bobby Fischer (USA · 2785 FIDE) — 11th World Champion · Crystal-Clear Classical Precision
José Raúl Capablanca (CUB · 8 yrs Unbeaten) — 3rd World Champion · The Human Chess Machine (8 Years Unbeaten)

C22 · Center Game: Normal Variation & Paulsen Attack (C22) · C24 · Bishop's Opening: Berlin Defense & Urusov Gambit (C24) · C44 · Ponziani Opening: Jaenisch & Steinitz Mainlines (C44) · Rule of the Square in Pawn Endgames