Pawn Structure Classification Codes

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Openings of height 0

  • 1.Na3 (A00: Durkin or Sodium attack) eval:-0.15
  • 1.Na3 Na6 (A00: Double Sodium) eval:+0.15
  • 1.Na3 Na6 2.Nf3 (A00: Double Sodium: Réti-Zukertort variation) eval:+0.15
  • 1.Na3 Nc6 (A00: Durkin attack: Black Mustang defense) eval:+0.04
  • 1.Na3 Nf6 (A00: Durkin attack: Indian variation) eval:-0.15
  • 1.Na3 Nf6 2.Nh3 (A00: Amar-Durkin attack: Indian variation) eval:-0.44
  • 1.Na3 Nh6 (A00: Durkin attack: Two Drunken Knights) eval:+0.29
  • 1.Na3 Nh6 2.Nh3 Na6 (A00: Drunken Cavalry) eval:+0.07
  • 1.Nc3 (A00: Dunst-van Geet opening) eval:+0.07
  • 1.Nc3 Nc6 (A00: Dunst-van Geet opening: Symmetrical variation) eval:+0.22
  • 1.Nc3 Nf6 (A00: Dunst-van Geet opening: Indian variation) eval:+0.07
  • 1.Nf3 (A04: Réti-Zukertort opening) eval:+0.11
  • 1.Nf3 Nc6 (A04: Réti-Zukertort opening: Black Mustang defense) eval:+0.18
  • 1.Nf3 Nf6 (A04: Réti-Zukertort opening: Symmetrical variation) eval:+0.11
  • 1.Nf3 Nf6 2.Na3 (A04: Réti-Zukertort opening: Symmetrical variation: Durkin attack) eval:-0.15
  • 1.Nf3 Nf6 2.Nc3 Nc6 (A04: Réti-Zukertort opening: Four Knights game) eval:+0.07
  • 1.Nh3 (A00: Amar opening) eval:-0.22
  • 1.Nh3 Na6 (A00: Amar opening: Two Drunken Knights)
  • 1.Nh3 Nh6 (A00: Double Ammonia)

A-openings

3a-0 openings

  • 1.a3 (A00: Anderssen's opening) eval:0.00
  • 1.a3 Na6 (A00: Anderssen's opening: Lemming defense) eval:+0.22
  • 1.a3 Nc6 (A00: Anderssen's opening: Black Mustang defense) eval:+0.04
  • 1.a3 Nf6 (A00: Anderssen's opening: Indian variation) eval:0.00
  • 1.Nf3 Nf6 2.a3 (A04: Réti-Zukertort opening: Symmetrical variation: Anderssen variation) eval:-0.04
  • 1.Nf3 Nc6 2.a3 (A04: Réti-Zukertort opening: Black Mustang defense: Anderssen variation) eval:0.00
  • 1.Nf3 Nf6 2.Nc3 Nc6 2.a3 (A04: Réti-Zukertort opening: Four Knights game: Anderssen variation) eval:-0.07

3a-5d openings

  • 1.a3 d5 (A00: Anderssen's opening: Queen's Pawn defense) eval:0.00
  • 1.a3 d5 2.Nf3 Nf6 (A00: Anderssen's opening: QP defense: King Knights game) eval:0.00
  • 1.Nf3 d5 2.a3 (A06: Réti-Zukertort opening: QP defense: Anderssen's attack) eval:0.00
  • 1.a3 d5 2.Nc3 (A00: Anderssen's opening: QP defense: Queen's Knight attack) eval:-0.18

3a-5e openings

  • 1.a3 e5 (A00: Anderssen's opening: King's Pawn defense) eval:0.00
  • 1.a3 e5 2.Nc3 Nf6 3.Nf3 Nc6 (A00: Anderssen's opening: KP defense: Four Knights game) eval:0.00
  • 1.a3 e5 2.Nf3 (A00: Anderssen's opening: KP defense: King's Knight attack) eval:-0.33
  • 1.Nc3 e5 2.a3 (A00: Dunst-van Geet opening: Battambang variation) eval:-0.04

Other 3a-openings

  • 3ah-5de 1.a3 e5 2.h3 d5 (A00: Creepy Crawly Formation) eval:-0.26

4a-openings

  • 4a-0 1.a4 (A00: Ware opening) eval:-0.07
  • 4a-5b 1.a4 b5 (A00: Ware opening: Wing gambit)
  • 4a-5h 1.a4 h5 (A00: Ware opening: Alook Alook) eval:+0.11
  • 4ab-5d6c 1.b4 d5 2.Bb2 c6 3.a4 (A00: Sokolsky opening: Myers variation) eval:-0.33
  • 4ad-5d6b 1.a4 b6 2.d4 d5 2.Nc3 Nd7 (A00: Ware opening: Cologne gambit)

6a-openings

  • 6a3e-5def 1.a4 e5 2.a5 d5 3.e3 f5 4.a6 (A00: Ware gambit)

0-6a defenses

  • 1.Nc3 a6 (A00: Dunst-van Geet opening: St. George defense) eval:+0.26
  • 1.Nf3 a6 (A04: Zukertort-Réti opening: St. George defense) eval:+0.26
  • 1.Nf3 a6 3.Nc3 (A04: Zukertort-Réti opening: St. George defense: Two Knights attack) eval:+0.22

B-openings

  • b-gambits:
    • b4e-5e6f 1.b4 e5 2.Bb2 f6 3.e4 Bxb4 (A00: Sokolsky opening: Tartakower gambit, accepted) eval:-0.15
    • b4e5f-5e6fg 1.b4 e5 2.Bb2 f6 3.e4 Bxb4 4.Bc4 Nc6 5.f4 Qe7 6.f5 g6 (A00: Sokolsky opening: Brinckmann variation) eval:-0.64
  • b-cbb gambits:
    • b4e-c5abb 1.b4 c6 2.Bb2 a5 3.b5 cxb5 4.e4 (A00: Sokolsky opening: Schühler gambit) eval:-0.18

3b-0 openings

  • 1.b3 (A01: Nimzo-Larsen attack) eval:-0.07
  • 1.b3 Na6 (A01: Nimzo-Larsen attack: Lemming defense) eval:+0.26
  • 1.b3 Nc6 (A01: Nimzo-Larsen attack: Black Mustang defense) eval:-0.07
  • 1.b3 Nf6 (A01: Nimzo-Larsen attack: Indian variation) eval:-0.04
  • 1.b3 Nf6 2.Bb2 (A01: Nimzo-Larsen attack: Indian variation: fianchetto line) eval:-0.04
  • 1.b3 Nf6 2.Nf3 (A01: Nimzo-Larsen attack: Symmetrical Indian variation) eval:-0.04
  • 1.b3 Nh6 (A01: Nimzo-Larsen attack: Amar defense) eval:+0.15

Other 3b-openings

  • 3b-6b 1.b3 b6 (A01: Nimzo-Larsen attack: symmetrical variation) eval:+0.18
  • 3b-5c 1.b3 c5 (A01: Nimzo-Larsen attack: English variation) eval:0.00
  • 3b-5d 1.b3 d5 (A01: Nimzo-Larsen attack: classical variation) eval:0.00
  • 3b-6d 1.b3 d6 (A01: Nimzo-Larsen attack: Rat defense) eval:0.00
  • 3b-5e 1.b3 e5 (A01: Nimzo-Larsen attack: modern variation) eval:-0.07
  • 3b-6e 1.b3 e6 (A01: Nimzo-Larsen attack: French defense) eval:+0.04
  • 3b-5f 1.b3 f5 (A01: Nimzo-Larsen attack: Dutch variation) eval:+0.11

4b-0 openings

  • 1.b4 (A00: Sokolsky Opening) eval:-0.18
  • 1.b4 Na6 (A00: Sokolsky opening: Bücker Defense) eval:+0.11
  • 1.b4 Nc6 (A00: Sokolsky opening: Grigorian variation) eval:+0.07
  • 1.b4 Nf6 (A00: Sokolsky opening: Indian variation) eval:-0.18
  • 1.b4 Nf6 2.Bb2 (A00: Sokolsky opening: Indian variation: Main fianchetto line) eval:-0.18
  • 1.Nf3 Nf6 2.b4 (A04: Réti-Zukertort opening: Symmetrical variation: Orangutan attack ) eval:-0.18
  • 1.b4 Nh6 (A00: Sokolsky opening: Karniewski or Tübingen variation) eval:+0.15

Other 4b-openings

  • 4b-5c 1.b4 c5 (A00: Sokolsky opening: Birmingham gambit) eval:+0.07
  • 4b-5ce 1.b4 e5 2.Bb2 c5 (A00: Sokolsky opening: Wolferts gambit) eval:+0.11
  • 4b-6c 1.b4 c6 (A00: Sokolsky opening: Outflank variation) eval:-0.04
  • 4b3a-5a 1.a3 a5 2.b4 (A00: Anderssen opening: Polish gambit)
  • 4b3a-5e 1.b4 e5 2.a3 (A00: Sokolsky opening: Bugayev attack) eval:-0.29
  • 4b3g-5de 1.g3 d5 2.Bg2 e5 3.b4 (A00: Benko opening: Gambit 59) eval:-0.52
  • 4be-5e6f 1.b4 e5 2.Bb2 f6 3.e4 (A00: Sokolsky opening: Tartakower gambit) eval:-0.15

C-openings

  • 0-5c 1.Nc3 c5 2.Rb1 (A00: Dunst-van Geet Opening: Twyble Attack) eval:-0.15
  • 3c-openings:
    • 3c-0 1.c3 (A00: Saragossa opening) eval:-0.07
    • 3c-5de 1.Nh3 e5 2.f3 d5 3.Nf2 (A00: Durkin opening: Krazy Kat) eval:-0.48
    • 3c-5e 1.c3 e5 2.Qc2 (A00: Saragossa opening: Hanham or Hayward variation) eval:-0.37
    • 4bg-6g 1.b4 Nf6 2.Bb2 g6 3.g4 (A00: Sokolsky opening: Polish Spike) eval:-0.22
  • 4c-openings:
    • 4c3be-5e6d 1.e3 e5 2.c4 d6 3.Nc3 Nc6 4.b3 Nf6 (A00: Van't Kruijs opening: Amsterdam attack) eval:-0.04
    • 4cg-5de 1.g4 e5 2.Bg2 d5 3.c4 (A00: Grob Opening: Hurst Attack) eval:-0.26

D-openings

  • 3d-openings:
    • 3d-0 1.d3 (A00: Mieses opening) eval:-0.04
    • 3d-5e 1.d3 e5 (A00: Mieses opening: Reversed Rat) eval:-0.04
    • 3dg-5c 1.d3 c5 2.Nc3 Nc6 3.g3 (A00: Mieses opening: Venezolana) eval:-0.07
  • 4d-openings:
    • 4d3g-5de 1.g3 d5 2.Bg2 e5 3.d4 (A00: Benko opening: Regan variation) eval:-0.04
    • 4dh-5e 1.h4 e5 2.d4 (Wulumulu) eval:-0.18

D-C Exchange Openings

  • d-c 1.Nc3 c5 2.d4 cxd4 3.Qxd4 Nc6 4.Qh4 (Dunst Opening: Novosibirsk Variation) eval:-0.11

E-openings

  • 3e-openings:
    • 3e-0 1.e3 (Van't Kruijs Opening, French Attack)
    • 3e-5e 1.e3 e5 (Van't Kruijs Opening)
    • 3e-5be 1.e3 e5 2.Bc4 b5 3.Bb3 (Bouncing Bishop Variation)
  • 4e-openings:
    • 4e-5e 1.e4 e5 2.Ke2 (C20: King Pawn game: Bongcloud) eval:-0.76
    • 4e3b-5ef 1.b3 e5 2.Bb2 f5 3.e4 (A01: Nimzo-Larsen attack: Ringelbach gambit) eval:
    • 4e3f-5e 1.f3 e5 2.e4 (King's Head opening) eval:-0.44
    • 4eg-5d 1.g4 d5 2.e4 (A00: Grob opening: Zilbermints gambit)
  • 5e-defenses:
    • 0-5e 1.Nc3 e5 (A00: Reversed Nimzovich) eval:+0.07
    • 0-5e 1.Nc3 e5 2.Nf3 (A00: Dunst-van Geet opening: Napoleon attack) eval:+0.07
  • e-dee gambits:
    • e3d-d4ee 1.Nc3 d5 2.e4 dxe4 3.d3 (A00: Dunst Gambit) eval:-0.07
    • e3f-d4ee 1.Nc3 d5 2.e4 dxe4 3.f3 (A00: Dunst-van Geet Opening: Dougherty or Pseudo-Diemer Gambit) eval:-0.29
    • e4d3cf-d4ee6g 1.f3 d5 2.e4 g6 3.d4 dxe4 4.c3 (A00: Barnes-Gedult opening: First Gedult gambit)
  • e-fee gambits:
    • e3f-f4ee 1.f3 f5 2.e4 fxe4 3.Nc3 (A00: Barnes-Gedult opening: Second Gedult's gambit)

E-D Exchange Openings

  • e-d 1.Nc3 d5 2.e4 dxe4 3.Nxe4 Qd5 (Dunst-van Geet opening: Amazon or pseudo-Scandinavian variation) eval:+0.29

F-openings

3f-openings

  • 3f-0 1.f3 (A00: Barnes-Gedult Opening) eval:-0.33
  • 3f-5de 1.Nh3 e5 2.f3 d5 3.Nf2 (A00: Amar opening: Krazy Kat) eval:-0.48
  • 3f-5e 1.f3 e5 2.Kf2 (A00: Hammerschlag or Pork Chop) eval:-0.56

4f-0 openings

  • 1.f4 (A02: Bird opening) eval:-0.07
  • 1.f4 Nc6 (A02: Bird opening: Nimzovich defense) eval:0.00
  • 1.f4 Nc6 2.Nf3 (A02: Bird opening: Nimzovich defense: King's Knight attack) eval:0.00
  • 1.f4 Nf6 (A02: Bird opening: Indian variation) eval:-0.07
  • 1.f4 Nf6 2.Nc3 (A02: Bird opening: Indian variation: Dunst-van Geet variation) eval:-0.15
  • 1.f4 Nf6 2.Nf3 (A02: Bird opening: Symmetrical Indian variation) eval:-0.07
  • 1.f4 Nf6 2.Nh3 (A02: Bird opening: Indian variation: Amar variation) eval:-0.41
  • 1.f4 Nh6 (A02: Bird opening: Drunken Knight) eval:+0.04
  • 1.f4 Nh6 2.Nf3 (A02: Bird opening: Drunken Knight: King's Knight attack) eval:+0.04

Other 4f-openings

  • 4f-5e 1.Nc3 e5 2.f4 (A00: Dunst-van Geet opening: Irish or Polish attack) eval:-0.33
  • 4f3b-5e 1.b3 e5 2.Bb2 Nc6 3.f4 (A01: Nimzo-Larsen attack: Paschmann gambit) eval:-0.93
  • 4f3g-5de 1.Nh3 d5 2.g3 e5 3.f4 (A00: Amar opening: Paris gambit) eval:-0.18

0-5f defenses

  • 1.Na3 f5 (A00: Durkin attack: Dutch variation) eval:+0.11
  • 1.Nc3 f5 (A00: Dunst-van Geet opening: Dutch variation) eval:+0.18
  • 1.Nf3 f5 (A04: Réti-Zukertort opening: Dutch variation) eval:+0.26
  • 1.Nf3 f5 2.Nc3 (A04: Two Knights attack: Dutch variation) eval:+0.18
  • 1.Nh3 f5 (A00: Amar opening: Dutch variation) eval:+0.26

f-eff gambits

  • f3ae-e4ff5d 1.e3 d5 2.Nc3 Nf6 3.a3 e5 4.f4 exf4 5.Nf3 (A00: Keoni-Hiva Gambit)
  • f3e-e4ff 1.e3 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3 (A00: Alua Variation)
  • f3e-e4ff 1.e3 e5 2.Nc3 Nf6 3.f4 exf4 4.Nf3 (A00: Akahi Variation)
  • f3e-e4ff5d 1.e3 e5 2.Nc3 d5 3.f4 exf4 4.Nf3 (A00: Ekolu Variation)

fh-e gambits

  • fh3g-e5d 1.Nh3 d5 2.g3 e5 3.f4 Bxh3 4.Bxh3 exf4 5.O-O fxg3 6.hxg3 (A00: Amar opening: Gent gambit) eval:-0.52

G-openings

  • g-gambits:
    • 4g-0 1.g4 (A00: Grob attack) eval:-0.29
    • 4g-0 1.Nc3 Nf6 2.g4 (A00: Dunst-van Geet opening: Tubingen gambit) eval:-0.18
    • g-5d 1.g4 d5 2.Bg2 Bxg4 (A00: Grob Gambit) -0.26
    • g4c-4d 1.g4 d5 2.Bg2 Bxg4 3.c4 d4 (A00: Grob opening: Romford Counter-Gambit) eval:-0.07
  • 3g-openings:
    • 3g-0 1.g3 (A00: Benko Opening) eval:+0.04
    • 3g-5e 1.g3 e5 2.Nf3 (A00: Reversed Alekhine) eval:+0.04
    • 3g-5h 1.g3 h5 (A00: Lasker Simul Special) eval:+0.22
  • 4g-openings:
    • 4g-0 1.g4 Nh6 (A00: Grob Opening: Bucker Defense) eval:0.00
    • 4g-5f 1.g4 f5 (A00: Grob Opening: Alessi Gambit) eval:+0.22
    • 4g-5f 1.Nc3 f5 2.g4 (A00: Dunst Opening: Glasscoe Gambit) eval:0.00
    • 4g-5g 1.g4 g5 (A00: Grob Opening: Double or Symmetrical Grob) eval:+0.22
    • 4g3a-6g 1.a3 g6 2.g4 (A00: Andersspike) eval:-0.26
    • 4g3b-6g 1.b3 Nf6 2.Bb2 g6 3.g4 (A01: Nimzo-Larsen attack: Spike variation) eval:-0.22
    • 4g3d-6g 1.d3 g6 2.g4 (A00: Grob Opening: Spike Deferred or Myers Spike attack) eval:-0.18
    • 4g3f-5e 1.f3 e5 2.g4 Qh4 (A00: Barnes-Gedult opening: Fool's mate) eval: mate
    • 4g3h-5d6c 1.g4 d5 2.Bg2 c6 3.h3 (A00: Grob Opening: Short Spike) eval:-0.07
    • 4g3h-5de 1.g4 d5 2.h3 e5 (A00: Grob opening: Keene Defense) eval:-0.33
  • 5g-openings:
    • 5g-5d6e 1.g4 d5 2.Bg2 c6 3.g5 (A00: Grob Opening: Spike Attack) eval:-0.04

H-openings

3h-0 openings

  • 1.h3 (A00: Clemenz Opening) eval:-0.04
  • 1.h3 Nc6 (A00: Clemenz opening: Black Mustang defense) eval:+0.04
  • 1.h3 Nf6 (A00: Anderssen opening: Indian variation) eval:+0.04
  • 1.Nc3 Nf6 2.h3 (A00: Dunst-van Geet opening: Indian variation: Clemenz variation) eval:-0.15
  • 1.Nf3 Nc6 2.h3 (A04: Réti-Zukertort opening: Black Mustang defense: Clemenz variation) eval:0.00
  • 1.Nf3 Nf6 2.h3 (A04: Réti-Zukertort opening: symmetrical variation: Clemenz variation) eval:+0.04

4h-openings

  • 4h-0 1.h4 (A00: Desprez or Kadas Opening) eval:-0.18
  • 4h-5a 1.h4 a5 (A00: Koola Koola) eval:+0.15
  • 4h-6g 1.Nc3 g6 2.h4 (A00: Dunst Opening: Anti-Pirc Variation or Myers Attack) eval:+0.04

0-6h defenses

  • 1.Nc3 h6 (A00: Dunst-van Geet opening: Basman defense) eval:+0.26
  • 1.Nf3 h6 (A04: Zukertort-Réti opening: Basman defense) eval:+0.37
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