ecocodes
Volume C · Open games and the French Defense‹ C36C38 ›
a1b2c3d4e5f6g7h8
Reference position · Black to move

C37 King’s Gambit Accepted: King’s Knight’s Gambit

C37 holds 34 named lines, all under the name King’s Gambit. It leaves C34, a position of the same name, with 4.Bc4. Black, to move in that position, has 28 legal moves, the fewest of the 10 King’s Gambit codes. Its deepest line, King’s Gambit Accepted: Double Muzio Gambit, Paulsen Defense, runs to 11.Rae1, the longest of the 10 King’s Gambit codes. White has two minor pieces off their first squares, level for the most of the 10 King’s Gambit codes.

Score sheet
#WhiteBlack
1e4e5
2f4exf4
3Nf3g5
4Bc4

The move that completes C37

The reference line of C38 plays all of these moves and continues beyond them; C37 is the position reached at 4.Bc4.

  1. 4.Bc4 The bishop leaves f1 for c4, opening a line for the rook on h1.

Lines filed under C37

All 34 share the start 1.e4 e5 2.f4 exf4 3.Nf3 and then split two ways at Black’s move 3.

NameAfter the shared startPliesAt the end
King’s Gambit Accepted: King’s Knight’s Gambit3...g5 4.Bc47Black +1
King’s Gambit Accepted: Quaade Gambit3...g5 4.Nc37Black +1
King’s Gambit Accepted: Rosentreter Gambit3...g5 4.d47Black +1
King’s Gambit Accepted: Blachly Gambit3...Nc6 4.Bc4 g58Black +1
King’s Gambit Accepted: Australian Gambit3...g5 4.Bc4 g4 5.h49Black +1
King’s Gambit Accepted: Ghulam-Kassim Gambit3...g5 4.Bc4 g4 5.d49Black +1
King’s Gambit Accepted: Lolli Gambit3...g5 4.Bc4 g4 5.Bxf7+9check
King’s Gambit Accepted: McDonnell Gambit3...g5 4.Bc4 g4 5.Nc39Black +1
King’s Gambit Accepted: Muzio Gambit, Wild Muzio Gambit3...g5 4.Bc4 g4 5.O-O9Black +1, White castled
King’s Gambit Accepted: Rosentreter Gambit, Sörensen Gambit3...g5 4.d4 g4 5.Nc39Black +1
King’s Gambit Accepted: Rosentreter Gambit, Testa Variation3...g5 4.d4 g4 5.Bxf49
King’s Gambit Accepted: Salvio Gambit3...g5 4.Bc4 g4 5.Ne59Black +1
King’s Gambit Accepted: Sörensen Gambit3...g5 4.d4 g4 5.Ne59Black +1
King’s Gambit Accepted: Muzio Gambit, Brentano Defense3...g5 4.Bc4 g4 5.O-O d510Black +1, White castled
King’s Gambit Accepted: Muzio Gambit, Kling and Horwitz Counterattack3...g5 4.Bc4 g4 5.O-O Qe710Black +1, White castled
King’s Gambit Accepted: Ghulam-Kassim Gambit3...g5 4.Bc4 g4 5.d4 gxf3 6.Qxf311Black +3
King’s Gambit Accepted: Kotov Gambit3...g5 4.Bc4 g4 5.d4 gxf3 6.Bxf411Black +3
King’s Gambit Accepted: Rosentreter Gambit, Bird Gambit3...g5 4.d4 g4 5.Ne5 Qh4+ 6.g311Black +1
King’s Gambit Accepted: Muzio Gambit Accepted, From’s Defense3...g5 4.Bc4 g4 5.O-O gxf3 6.Qxf3 Qe712Black +3, White castled
King’s Gambit Accepted: Muzio Gambit, Holloway Defense3...g5 4.Bc4 g4 5.O-O gxf3 6.Qxf3 Nc612Black +3, White castled
King’s Gambit Accepted: Muzio Gambit, Sarratt Defense3...g5 4.Bc4 g4 5.O-O gxf3 6.Qxf3 Qf612Black +3, White castled
King’s Gambit Accepted: Salvio Gambit, Cochrane Gambit3...g5 4.Bc4 g4 5.Ne5 Qh4+ 6.Kf1 f312Black +1
King’s Gambit Accepted: Salvio Gambit, Santa Maria Defense3...g5 4.Bc4 g4 5.Ne5 Qh4+ 6.Kf1 Nf612Black +1
King’s Gambit Accepted: Salvio Gambit, Silberschmidt Defense3...g5 4.Bc4 g4 5.Ne5 Qh4+ 6.Kf1 Nh612Black +1
King’s Gambit Accepted: Salvio Gambit, Viennese Variation3...g5 4.Bc4 g4 5.Ne5 Qh4+ 6.Kf1 Nc612Black +1
King’s Gambit Accepted: Double Muzio Gambit, Bello Gambit3...g5 4.Bc4 g4 5.O-O gxf3 6.Qxf3 Qf6 7.Nc313Black +3, White castled
King’s Gambit Accepted: Middleton Countergambit3...g5 4.Bc4 d6 5.O-O Bg4 6.h3 h5 7.hxg4 hxg414White +1, White castled
King’s Gambit Accepted: Salvio Gambit, Anderssen Counterattack3...g5 4.Bc4 g4 5.Ne5 Qh4+ 6.Kf1 Nh6 7.d4 d614Black +1
King’s Gambit Accepted: Silberschmidt Gambit3...g5 4.Bc4 g4 5.Ne5 Qh4+ 6.Kf1 Nh6 7.d4 f314Black +1
King’s Gambit Accepted: Double Muzio Gambit3...g5 4.Bc4 g4 5.O-O gxf3 6.Qxf3 Qf6 7.e5 Qxe5 8.Bxf7+15Black +3, White castled, check
King’s Gambit Accepted: Double Muzio Gambit, Baldwin Gambit3...g5 4.Bc4 g4 5.O-O gxf3 6.Qxf3 Qf6 7.Nc3 Qd4+ 8.Kh1 Qxc4 9.Nd517Black +6, White castled
King’s Gambit Accepted: Lolli Gambit, Young Variation3...g5 4.Bc4 g4 5.Bxf7+ Kxf7 6.O-O gxf3 7.Qxf3 Qf6 8.d4 Qxd4+ 9.Be3 Qf6 10.Nc319Black +6, White castled
King’s Gambit Accepted: Double Muzio Gambit, Young Gambit3...g5 4.Bc4 g4 5.O-O gxf3 6.Qxf3 Qf6 7.Bxf7+ Kxf7 8.d4 Qxd4+ 9.Be3 Qf6 10.Nc3 fxe320Black +9, White castled
King’s Gambit Accepted: Double Muzio Gambit, Paulsen Defense3...g5 4.Bc4 g4 5.O-O gxf3 6.Qxf3 Qf6 7.e5 Qxe5 8.d3 Bh6 9.Nc3 Ne7 10.Bd2 Nbc6 11.Rae121Black +4, White castled

The road to C37

  1. 1.e4 … 2...exf4four earlier stops: B00, C20, C30, C33
  2. 3.Nf3C34 King’s Knight’s Gambit
  3. 3...g5C34 King’s Knight’s Gambit
  4. 4.Bc4C37

The position after 4.Bc4

White has brought out the knight on f3 and bishop on c4; Black has not yet moved a knight or bishop. White has a half-open f-file; Black a half-open e-file.

WhiteBlackMaterial (pawn units)3839Minor pieces developed20Moves spent on pawns23Pawns on d4, e4, d5, e510Squares attacked in the other half86Doubled pawns01not castlednot castled

Codes that branch off from C37

The reference lines of one other code leave C37 from the position after 4.Bc4, each with its own moves.

CodeMovesReference line
C384...Bg7King’s Gambit Accepted: Traditional Variation

Closest boards in other codes

CodeLineDiffers on
C39King’s Gambit Accepted: King’s Knight’s Gambitfour squares: f1, h2, c4, h4
C33King’s Gambit Acceptedsix squares: f1, g1, f3, c4, g5, g7
C35King’s Gambit Accepted: Cunningham Defensesix squares: f1, c4, g5, e7, g7, f8
C36King’s Gambit Accepted: Modern Defensesix squares: f1, c4, d5, g5, d7, g7
C23Bishop’s Openingseven squares: g1, f2, f3, f4, e5, g5, g7
C40King’s Knight Openingseven squares: f1, f2, c4, f4, e5, g5, g7
C50Italian Gameseven squares: f2, f4, e5, g5, c6, g7, b8

Where lines continue from here

Five named lines filed under other codes pass through the position after 4.Bc4. All of them belong to the codes listed above.

Volume C

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