ecocodes
Volume D · Closed and semi-closed games‹ D30D32 ›
a1b2c3d4e5f6g7h8
Reference position · Black to move

D31 Queen’s Gambit Declined: Queen’s Knight Variation

Also filed here: Semi-Slav Defense.

D31 holds 21 named lines from two openings, most of them (13) under Semi-Slav Defense. It leaves D30 (Queen’s Gambit Declined) with 3.Nc3. Material is no longer level at the end of 11 of its lines; the widest gap, one pawn in Black’s favour, comes in Queen’s Gambit Declined: Charousek Variation, Miladinovic Gambit. With 21 named lines it is the largest code of the 44 Queen’s Gambit codes. Lines of 24 other codes continue from its position, the third-widest spread of the 44 Queen’s Gambit codes.

Score sheet
#WhiteBlack
1d4d5
2c4e6
3Nc3

The move that completes D31

The reference line of D32 plays all of these moves and continues beyond them; D31 is the position reached at 3.Nc3.

  1. 3.Nc3 The knight leaves b1 for c3, opening a line for the rook on a1.

Lines filed under D31

All 21 share the start 1.d4 and then split two ways at Black’s move 1.

NameAfter the shared startPliesAt the end
Queen’s Gambit Declined: Queen’s Knight Variation1...d5 2.c4 e6 3.Nc35
Queen’s Gambit Declined: Alapin Variation1...e6 2.c4 b6 3.Nc3 d56
Queen’s Gambit Declined: Charousek Variation1...d5 2.c4 e6 3.Nc3 Be76
Queen’s Gambit Declined: Janowski Variation1...d5 2.c4 e6 3.Nc3 a66
Semi-Slav Defense: Accelerated Move Order1...d5 2.c4 e6 3.Nc3 c66
Semi-Slav Defense: Marshall Gambit1...d5 2.c4 e6 3.Nc3 c6 4.e47
Semi-Slav Defense: Anti-Noteboom, Stonewall Variation1...d5 2.c4 e6 3.Nc3 c6 4.e3 f58
Semi-Slav Defense: Noteboom Variation1...d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc48Black +1
Queen’s Gambit Declined: Charousek Variation, Miladinovic Gambit1...d5 2.c4 e6 3.Nc3 Be7 4.e4 dxe4 5.f39Black +1
Semi-Slav Defense: Anti-Noteboom, Stonewall Variation, Portisch Gambit1...d5 2.c4 e6 3.Nc3 c6 4.e3 f5 5.g49
Semi-Slav Defense: Gunderam Gambit1...d5 2.c4 e6 3.Nc3 c6 4.e4 dxe4 5.f39Black +1
Semi-Slav Defense: Noteboom Variation, Anti-Noteboom Gambit1...d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.g39Black +1
Semi-Slav Defense: Noteboom Variation, Anti-Noteboom Variation1...d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.Bg59Black +1
Semi-Slav Defense: Noteboom Variation, Anti-Noteboom Variation, Belyavsky Line1...d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.Bg5 f610Black +1
Semi-Slav Defense: Marshall Gambit, Forgotten Variation1...d5 2.c4 e6 3.Nc3 c6 4.e4 dxe4 5.Nxe4 Bb4+ 6.Nc311
Semi-Slav Defense: Marshall Gambit, Main Line1...d5 2.c4 e6 3.Nc3 c6 4.e4 dxe4 5.Nxe4 Bb4+ 6.Bd211
Queen’s Gambit Declined: Semi-Slav, Abrahams Variation1...d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.a4 Bb4 6.e3 b5 7.Bd2 a514Black +1
Queen’s Gambit Declined: Semi-Slav, Junge Variation1...d5 2.c4 e6 3.Nf3 c6 4.Nc3 dxc4 5.a4 Bb4 6.e3 b5 7.Bd2 Qb614Black +1
Queen’s Gambit Declined: Semi-Slav, Koomen Variation1...d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.e3 b5 6.a4 Bb4 7.Bd2 Qe714Black +1
Semi-Slav Defense: Noteboom Variation, Abrahams Variation1...d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.a4 Bb4 6.e3 Bxc3+ 7.bxc3 b5 8.axb5 cxb516Black +1
Semi-Slav Defense: Marshall Gambit, Tolush Variation1...d5 2.c4 e6 3.Nc3 c6 4.e4 dxe4 5.Nxe4 Bb4+ 6.Bd2 Qxd4 7.Bxb4 Qxe4+ 8.Be2 c5 9.Bxc5 Qxg218Black +1

The road to D31

  1. 1.d4 … 1...d5two earlier stops: A40, D00
  2. 2.c4D06 Queen’s Gambit
  3. 2...e6D30 Queen’s Gambit Declined
  4. 3.Nc3D31

The position after 3.Nc3

White has brought out the knight on c3; Black has not yet moved a knight or bishop. Black could capture with dxc4. Undefended and attacked: the pawn on c4. Black is to move and has 34 legal moves.

WhiteBlackMaterial (pawn units)3939Minor pieces developed10Moves spent on pawns22Pawns on d4, e4, d5, e511Squares attacked in the other half65not castlednot castled

Codes that branch off from D31

The reference lines of two other codes leave D31 from the position after 3.Nc3, each with its own moves.

CodeMovesReference line
D323...c5Tarrasch Defense
D353...Nf6Queen’s Gambit Declined: Normal Defense

Closest boards in other codes

CodeLineDiffers on
B14Caro-Kann Defense: Panov Attackfour squares: e2, f6, c7, g8
C10French Defense: Paulsen Variationfour squares: c2, e2, c4, e4
D06Queen’s Gambitfour squares: b1, c3, e6, e7
D08Queen’s Gambit Declined: Albin Countergambitfour squares: b1, c3, e5, e6
D37Queen’s Gambit Declined: Three Knights Variationfour squares: g1, f3, f6, g8
D50Queen’s Gambit Declined: Modern Variationfour squares: c1, g5, f6, g8
A13English Opening: Agincourt Defensesix squares: b1, d2, c3, d4, d5, d7

Where lines continue from here

Besides the codes above, they belong to D33, D34, D36, D37, D40, D41, D45, D48, D50, D51, D52, D53, D56, D57, D58, D59, D61, D63, D66, D67, D68, D69.

Volume D

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