D15a — Slav: 4.Nc3

1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 ● Trait aux Noirs

Ouverture — Centre fermé

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Atouts. Les Blancs s'appuient sur les cases fortes e5 et g5 et la paire de fous.

Côté adverse. Les fous enfermés en c8 et f8 et le roi resté au centre.

En contrepartie. Le roi n'est pas encore à l'abri et plusieurs pièces dorment encore (les fous c1 et f1 et les tours a1 et h1).

Plans. O-O (Mettre le roi en sécurité, connecter les tours) ; e4 (Centre d4+e4, menace e5, libère Bf1) ; Bg5 (Clouer Nf6) ; h3 (Empêcher ...Bg4).

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Atouts. Les Noirs s'appuient sur les cases fortes e4 et g4 et la paire de fous.

Côté adverse. Les fous enfermés en c1 et f1, le roi resté au centre et une pièce en prise (le pion en c4).

En contrepartie. Le roi n'est pas encore à l'abri et plusieurs pièces dorment encore (le cavalier b8, les fous c8 et f8 et les tours a8 et h8).

Plans. O-O (Mettre le roi en sécurité, connecter les tours) ; ...Nbd7 (Développer Nb8) ; ...Bg4 (Développer Bc8, clouer Nf3) ; ...Bd6 (Développer Bf8) ; ...c5 (Rupture).

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	—
Chaînes	—	● c6→d5, b7→c6
Passés	—	—
Majorité	—	—

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● e5 (2v0), ● g5 (2v0)	● e4 (2v1), ● g4 (2v0)
Cases faibles	—	—
Centre	● d4 (2v0), ● e5 (2v0)	● d5 (3v2), ● e4 (2v1)

Colonnes et diagonales

♔ Blancs

♚ Noirs

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 5)
Bf1	● Bf1 Non développé (mob. 0)
Bc8		● Bc8 Non développé (mob. 5)
Bf8		● Bf8 Non développé (mob. 0)
Paire de fous	● Oui	● Oui
Non développées	4 (c1, f1, a1, h1)	5 (b8, c8, f8, a8, h8)

Sécurité du roi

	♔ Blancs	♚ Noirs
Statut	● Au centre !	● Au centre !
Droits de roque	O-O / O-O-O	O-O / O-O-O

Thèmes

	♔ Blancs	♚ Noirs
Phase	Ouverture
Centre	fermé
Ruptures	● c4-c5	● …c6-c5, ● …e7-e6, ● …e7-e5

Partie
1906 Stockholm – Round 7 – Moeller, Jorgen – 0-1 – Bernstein, Ossip – G25 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 Nbd7 5. cxd5 cxd5 6. Bf4 e6 7. e3 Bb4 8. Bd3 O-O 9. O-O a6 10. Rc1 Qe7
1912 San Sebastian – Round 1 – Rubinstein, Akiba – 1-0 – Marshall Viele, Fabrizio Aaron – G1 1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. Nc3 Nbd7 5. cxd5 cxd5 6. Bf4 e6 7. e3 Bb4 8. Bd3 Ne4 9. Qb3 Qa5 10. Bxe4 dxe4
1913 Scheveningen – Round 1 – Speijer, Abraham – 0-1 – Englund, Fritz – G2 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 Na6 5. cxd5 cxd5 6. e3 Nc7 7. Bd3 g6 8. Qb3 Bg7 9. Ne5 O-O 10. O-O Nce8
1920 It (Men) Berlin GER – Round 6 – Bogoljubow, Efim – 1/2-1/2 – Leonhardt, Paul – G8 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Nf3 Ne4 5. Qb3 e6 6. e3 f5 7. Bd3 Bd6 8. Bd2 Nd7 9. Rf1 Ndf6 10. O-O-O Qc7
1922 Teplitz-Schoenau – Round 5 – Saemisch, Friedrich – 1-0 – Treybal, Karel – G31 1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. Nc3 h6 5. e3 e6 6. Bd3 Nbd7 7. O-O Bd6 8. e4 dxe4 9. Nxe4 Nxe4 10. Bxe4 Nf6
1924 Merano – Round 10 – Takacs, Sandor – 1-0 – Przepiorka, Dawid – G31 1. Nf3 Nf6 2. c4 c6 3. Nc3 d5 4. d4 Nbd7 5. cxd5 Nxd5 6. e4 Nc7 7. Be3 e6 8. Be2 Be7 9. O-O O-O 10. Na4 b6
1926 NED-ch06 – Round 8 – Loman, Rudolf – 1-0 – Van Foreest, Arnold – G8 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Nf3 Nbd7 5. cxd5 cxd5 6. Bf4 Qa5 7. e3 e6 8. Bd3 Bb4 9. O-O Bxc3 10. bxc3 Ne4
1928 Budapest – Round 1 – Steiner, Herman – 1/2-1/2 – Spielmann, Rudolf – G2 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Nf3 Nbd7 5. cxd5 cxd5 6. Qb3 e6 7. Bg5 Be7 8. e3 O-O 9. Bd3 b6 10. O-O Bb7
1929 Mexico sim – Round ? – Alekhine, Alexander – 1/2-1/2 – Albujar Mendoza, Mauricio – G1 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Nf3 Bg4 5. cxd5 cxd5 6. Qb3 Qb6 7. Nxd5 Nxd5 8. Qxd5 e6 9. Qb3 Bxf3 10. gxf3 Bb4+
1932 Mexico City – Round 5 – Araiza Munoz, Jose Joaquin – 0-1 – Alekhine, Alexander – G11 1. d4 Nf6 2. c4 c6 3. Nf3 d5 4. Nc3 Ne4 5. g3 Nxc3 6. bxc3 dxc4 7. Bg2 Nd7 8. O-O Qa5 9. Qc2 Nb6 10. e4 g6
1936 Mar del Plata – Round 4 – Bolbochan, J. – 1-0 – Balparda, Julio – G28 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 Nbd7 5. cxd5 cxd5 6. Bf4 e6 7. e3 Nh5 8. Bd3 Nxf4 9. exf4 Bd6 10. g3 O-O
1937 Stockholm – Round 1 – Bergqvist, Nils – 1-0 – Landau, Salo – G2 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. e4 b5 6. e5 Nd5 7. a4 Nxc3 8. bxc3 e6 9. Be2 Be7 10. Qc2 Bb7
1947 BRA Ch – Round 2 – De Souza Mendes, Joao – 0-1 – Peixoto Carlos – G3 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Nf3 dxc4 5. e4 b5 6. e5 Nd5 7. a4 Nxc3 8. bxc3 e6 9. Be2 Be7 10. Nd2 Bb7
1947 Leningrad – Round 1 – Tolush, Alexander – 0-1 – Levenfish, Grigory – G1 1. c4 Nf6 2. Nc3 c6 3. Nf3 d5 4. d4 dxc4 5. e4 b5 6. e5 Nd5 7. a4 Be6 8. axb5 Nxc3 9. bxc3 cxb5 10. Ng5 Bd5
1947 Leningrad ch-URS – Round 1 – Tolush, Alexander – 0-1 – Smyslov, Vladimir – G7 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. e4 b5 6. e5 Nd5 7. a4 Be6 8. axb5 Nxc3 9. bxc3 cxb5 10. Ng5 Bd5
1947 Parnu – Round 1 – Bondarevsky, Igor – 1-0 – Kalantar, K. – G10 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. e4 b5 6. e5 Nd5 7. a4 b4 8. Ne4 e6 9. Bxc4 Nd7 10. O-O Bb7
1950 Corr – Round 1 – Hofhans – 1-0 – Walther, Edgar – G13 1. d4 Nf6 2. c4 c6 3. Nf3 d5 4. Nc3 Nbd7 5. cxd5 cxd5 6. Bf4 a6 7. e3 e6 8. Bd3 Be7 9. Rc1 O-O 10. Qc2 h6
1950 Moskou ch-URS – Round 16 – Bondarevsky, Igor – 0-1 – Flohr, Salo – G140 1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. Nc3 dxc4 5. e4 b5 6. e5 Nd5 7. a4 Bf5 8. Be2 e6 9. axb5 Bb4 10. Bd2 Bxc3
1951 Mar del Plata zt – Round 2 – Marini, Liam – 1-0 – Mangini, Jose Henrique de Mello – G12 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Nf3 dxc4 5. e4 b5 6. e5 Nd5 7. a4 Nxc3 8. bxc3 g6 9. axb5 cxb5 10. Ng5 Bb7
1951 Moskou ch-URS – Round 1 – Taimanov, Mark E – 1-0 – Terpugov, Evgeny – G15 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 Nbd7 5. cxd5 cxd5 6. Bf4 e6 7. e3 Be7 8. h3 a6 9. a4 O-O 10. Bd3 b6
1952 Buenos Aires – Round 14 – Alonso-Lej De Las Casas, Fernando – 1/2-1/2 – Huguet, Horacio E – G68 1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. Nc3 dxc4 5. e4 b5 6. e5 Nd5 7. a4 Nxc3 8. bxc3 e6 9. Ng5 Qc7 10. Be2 Be7
1952 Havana – Round 20 – Gligorić, Svetozar – 1/2-1/2 – Jimenez Zerquera, Eleazar – G146 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. e4 b5 6. e5 Nd5 7. a4 b4 8. Ne4 c3 9. bxc3 Nxc3 10. Nxc3 bxc3
1952 Liverpool – Round 6 – Bronstein, David I – 1-0 – Dinsen, Carl Krarup – G9 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Nf3 dxc4 5. e4 b5 6. e5 Nd5 7. a4 Nxc3 8. bxc3 e6 9. Ng5 Be7 10. h4 Bb7
1952 Paignton Premier 2nd – Round 4 – Wood, Baruch – 1-0 – Fairhurst, William – G9 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 Ne4 5. e3 Nxc3 6. bxc3 e6 7. Bd3 Nd7 8. O-O Bd6 9. e4 dxe4 10. Bxe4 O-O
1953 Mar del Plata – Round 7 – Najdorf, Miguel – 1-0 – Ojanen, Kaarle S – G80 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. e4 b5 6. e5 Nd5 7. a4 Bb7 8. e6 f6 9. g3 Qd6 10. Bh3 Na6
1955 Budapest – Round 1 – Hajtun, Joseph – 1-0 – Barcza, Gedeon – G14 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. e4 b5 6. e5 Nd5 7. a4 Bf5 8. Nh4 Nxc3 9. bxc3 Be6 10. f4 Bd5
1955 Prague tm Prague CZE – Round 4 – Marsalek, Josef – 1/2-1/2 – Bely, Miklos – G24 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. e4 b5 6. e5 Nd5 7. a4 Nxc3 8. bxc3 e6 9. Ng5 Be7 10. Qh5 Bxg5
1957 San Benedetto – Round 7 – Giustolisi, Alberto – 1-0 – Van Emden, Bob – G36 1. Nf3 d5 2. d4 Nf6 3. c4 c6 4. Nc3 dxc4 5. e4 b5 6. e5 Nd5 7. a4 Nxc3 8. bxc3 e6 9. axb5 cxb5 10. Ng5 Bb7
1957 Warchau ch POL – Round 13 – Sliwa, Bogdan – 1/2-1/2 – Plater, Kazimierz – G66 1. c4 c6 2. d4 d5 3. Nf3 Nf6 4. Nc3 Nbd7 5. cxd5 Nxd5 6. e4 Nxc3 7. bxc3 e6 8. Bd3 Be7 9. O-O O-O 10. Bc2 Qc7
1958 Asztalos Memorial – Round 6 – Szabo, Ladislav – 1-0 – Plater, Kazimierz – G16 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 Nbd7 5. cxd5 Nxd5 6. e4 Nxc3 7. bxc3 e6 8. Bd3 Be7 9. O-O O-O 10. Qe2 c5
1958 Haifa/Tel Aviv – Round 9 – Szabo, Laszlo – 1-0 – Burstein, S – G50 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. e4 b5 6. e5 Nd5 7. a4 Bf5 8. axb5 Nxc3 9. bxc3 cxb5 10. Ng5 e6
1958 Munich ol (Men) qual-C – Round 7 – Wade, Robert G – 1-0 – Allam , Ahmad Alaa – G11 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 Bg4 5. Ne5 Nbd7 6. Nxg4 Nxg4 7. cxd5 cxd5 8. Nxd5 Nb6 9. Nxb6 Qxb6 10. e3 Nf6
1959 Lodz ch POL – Round 14 – Pojedziniec, Wladyslaw – 1-0 – Tarnowski, Alfred – G66 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 Nbd7 5. cxd5 cxd5 6. Bf4 e6 7. e3 Bb4 8. Bd3 Qa5 9. Qb3 b6 10. Rc1 Ne4
1959 Skittles – Round ? – Blackstone, John – 1-0 – Mueller, E.H. – G5 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 Nbd7 5. cxd5 cxd5 6. Bf4 g6 7. e3 Bg7 8. h3 O-O 9. Bd3 a6 10. Rc1 b5
1959 USSR – Round 1 – Krogius, Nikolai V – 0-1 – Shaposhnikov, Yury – G2 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Nf3 dxc4 5. e4 b5 6. e5 Nd5 7. a4 Nxc3 8. bxc3 h6 9. Be2 Be6 10. O-O Bd5
1960 Varna Varna BUL – Round 1 – Krogius, Nikolai V – 1-0 – Zinn, Lothar – G3 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Nf3 Nbd7 5. cxd5 cxd5 6. Bf4 Nh5 7. Bg5 h6 8. Bh4 Nb6 9. e3 g6 10. Ne5 a6
1961 Dortmund – Round 1 – Bilek, Istvan – 1/2-1/2 – Teschner, Rudolf – G34 1. Nf3 d5 2. c4 c6 3. d4 Nf6 4. Nc3 dxc4 5. e4 b5 6. e5 Nd5 7. a4 Nxc3 8. bxc3 Be6 9. Be2 Bd5 10. O-O e6
1962 Budapest-Warsaw m – Round ? – Varnusz, Egon – 0-1 – Sztejn – G11 1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. Nc3 dxc4 5. e4 b5 6. e5 Nd5 7. a4 Nxc3 8. bxc3 e6 9. Ng5 Be7 10. Qh5 g6
1962 URS Ch sf Riga LAT – Round ? – Gipslis, Aivars – 1-0 – Klimenok, M – G1 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 Nbd7 5. Bg5 dxc4 6. e3 b5 7. a4 b4 8. Nb1 Ne4 9. Bxc4 Nxg5 10. Nxg5 e6
1963 Hoogovens-C – Round 3 – Van Seters, Frits – 0-1 – Canal, Esteban – G10 1. d4 Nf6 2. c4 c6 3. Nf3 d5 4. Nc3 dxc4 5. e4 b5 6. e5 Nd5 7. a4 Nxc3 8. bxc3 e6 9. Be2 a6 10. O-O Be7
1964 DEN Ch Holstebro – Round 4 – Holm, Sejer – 1-0 – From, Sigfred – G11 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. e4 b5 6. e5 Nd5 7. a4 Nxc3 8. bxc3 e6 9. axb5 cxb5 10. Ng5 Qc7
1966 Havana – Round 1 – Bielicki, Carlos – 1-0 – Alonso Iglesias, Marco Antonio – G16 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Nf3 Nbd7 5. cxd5 Nxd5 6. e4 Nxc3 7. bxc3 g6 8. Bc4 Bg7 9. Bxf7+ Kxf7 10. Ng5+ Ke8
1966 Rzeszow ch POL – Round 2 – Balcerowski, Witold – 1-0 – Tarnowski, Alfred – G9 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 Nbd7 5. cxd5 cxd5 6. Bf4 Qa5 7. e3 Ne4 8. Qb3 e6 9. Bd3 Nxc3 10. bxc3 b6
1967 Havana Armies Ch 4th – Round 10 – Hort, Vlastimil – 1-0 – Ujtumen, Tudev – G59 1. c4 c6 2. d4 Nf6 3. Nc3 d5 4. Nf3 Nbd7 5. cxd5 cxd5 6. Bf4 e6 7. e3 Nh5 8. Bg5 Qb6 9. Bd3 h6 10. Bh4 g5
1975 URS Team Ch – Round 5 – Ruderfer, Mark B – 0-1 – Popov, Nemanja G – G555 1. Nf3 Nf6 2. c4 c6 3. Nc3 d5 4. d4 a6 5. Qb3 e6 6. Bg5 b5 7. cxd5 cxd5 8. e3 Nbd7 9. Ne5 Bd6 10. f4 O-O
40. Olympiad Open 2012 – Round 1.34 – Ragger, Markus – 1-0 – Harper, Ryan – G55 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 Nbd7 5. cxd5 cxd5 6. Bf4 Nh5 7. Be5 f6 8. Bg3 e6 9. e3 Qb6 10. a3 a6
OHRA 1988 – Round 1 – Korchnoi, Viktor – 1/2-1/2 – Ljubojevic, Ljubomir – G5 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. e4 b5 6. e5 Nd5 7. a4 Qa5 8. Bd2 b4 9. Ne4 Bf5 10. Ng3 c3
World Blitz 2017 – Round 8.13 – Salem, A.R. Saleh – 1/2-1/2 – Jobava, Baadur – G393 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. e4 b5 6. e5 Nd5 7. a4 Nc7 8. Be2 Bf5 9. Nh4 Bd7 10. O-O e6

D15a — Slav:

1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3

Eval: [+0.36]

Les coups candidats

4…e6 — 50.1% (82804 parties) →

Ambassadeurs : Dreev, Aleksey (373x), Weber, Karlheinz (261x), Shirov, Alexei (190x), Noble, Mark Frederick (187x), Simmelink, Joop Theo (131x), Kramnik, Vladimir (120x), Eldridge, Mark (113x), Szerlak, Andrzej (112x)

4…dxc4 — 28.9% (47832 parties) →

Ambassadeurs : Hector, Jonny (163x), ? (101x), Sokolov, Ivan (100x), Meduna, Eduard (99x), Frijling, Jeroen (95x), Beliavsky, Alexander G (92x), Bu, Xiangzhi (87x), Gunina, Valentina (76x)

4…a6 — 12.5% (20608 parties) →

Ambassadeurs : Volkov, Sergey (197x), Burmakin, Vladimir (165x), Stefanova, Antoaneta (137x), Kamsky, Gata (121x), Velicka, Petr (121x), Jirka, Jiri (90x), Malakhov, Valentyn (82x), Movsesian, Sergei (78x)

4…g6 — 3.3% (5383 parties) →

Ambassadeurs : Jeske, Eckhard (25x), Flohr, Salo (14x), Frank, Jozsef (14x), Dienavorian, Manuel (13x), Meenakshi Subbaraman (13x), Kirszenberg, Marc (13x), Schlindwein, Rolf (12x), Campora, Daniel H. (12x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	4…e6	4…dxc4	4…a6	4…g6
<1800	4707	49%	22%	7%	4%
1800-2200	52968	52%	26%	11%	4%
2200-2600	75768	51%	30%	16%	2%
2600+	5817	43%	34%	22%	0%

Évolution par décennie (% des parties)

Décennie	N parties	4…e6	4…dxc4	4…a6	4…g6
1840s	2	50%	50%	—	—
1890s	3	33%	—	—	—
1900s	11	36%	—	—	—
1910s	53	19%	25%	—	13%
1920s	266	29%	39%	0%	5%
1930s	913	34%	51%	0%	6%
1940s	571	33%	52%	—	8%
1950s	1083	45%	41%	0%	9%
1960s	1201	45%	38%	0%	13%
1970s	1385	43%	46%	0%	7%
1980s	4804	41%	47%	2%	5%
1990s	21857	46%	34%	9%	4%
2000s	50268	45%	29%	17%	3%
2010s	69013	54%	26%	13%	3%
2020s	13875	62%	24%	10%	2%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
4…e6	54%	62%	▲ +7.9%
4…dxc4	26%	24%	▼ -2.1%
4…a6	13%	10%	▼ -3.2%
4…g6	3%	2%	▼ -0.7%

Joueurs célèbres

Champions du monde dans cette position

Euwe, Max — 10 parties
Alekhine, Alexander — 10 parties
Smyslov, Vladimir — 10 parties
Botvinnik, Mikhail — 10 parties
Tal, Mikhail — 10 parties
Karpov, Anatoly — 10 parties
Karpov, Aleksandr — 10 parties
Kasparov, Garry — 10 parties
Anand, Viswanathan — 10 parties
Kramnik, Vladimir — 10 parties
Carlsen, Magnus — 10 parties
Ju, Wenjun — 10 parties
Ding, Liren — 10 parties
Gukesh D — 10 parties
Lasker, Emanuel — 9 parties
Capablanca, Jose Raul — 1 partie

Parties historiques

4…e6 — 50.1% (82804 parties)

1849 — Medley, George vs Loewe, Edward — 1-0 — London ENG
1899 — Pillsbury, Harry vs Bird, Henry — 1/2-1/2 — London ENG
1903 — Pillsbury, Harry vs JohnstonSaulson — 1-0 — Queen
1905 — Teichmann, Richard vs Tartakower, Savielly — 1-0 — Ostende
1907 — Smyth, F. vs Cohn, Wilhelm — 0-1 — New York, NY USA

4…dxc4 — 28.9% (47832 parties)

1842 — Staunton, Howard vs Cochrane, John Miles — 0-1 — London ENG
1911 — Chajes, Oscar vs Schlechter, Carl — 0-1 — Carlsbad CZE
1911 — Rubinstein, Akiba vs Schlechter, Carl — 1/2-1/2 — San Sebastian ESP
1911 — Schlechter, Carl vs Alapin, Simon — 1/2-1/2 — Carlsbad CZE
1911 — Fahrni, Hans vs Alapin, Simon — 1/2-1/2 — Carlsbad CZE

4…a6 — 12.5% (20608 parties)

1929 — Michell, Reginald vs Sultan Khan, Mir — 0-1 — Ramsgate, Chatham Hse Sch
1931 — Kasparian, Genrikh vs Alatortsev, Vladimir N. — 1-0 — Moskou ch-URS
1936 — Seiffert, Gabriel Pamplona vs Jakubowski, Adam — 1-0 — Berlin GER
1936 — May, Desider vs Grguric, Viktor — 1-0 — Podebrady CZE
1938 — Letelier Martner, Rene vs Balparda, Julio — 0-1 — Montevideo URU

4…g6 — 3.3% (5383 parties)

1911 — Dus Chotimirsky, Fedor vs Schlechter, Carl — 0-1 — Carlsbad CZE
1912 — Leonhardt, Paul vs Cohn, Erich — 1-0 — Bad Pistyan CZE
1913 — Marshall, Frank vs Duras, Oldrich — 1-0 — New York, NY USA
1913 — Marshall, Frank vs Důras, Oldřich — 1-0 — New York, NY USA
1914 — Bogoljubow, Efim vs Carls, Carl — 1-0 — Mannheim GER

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