Structure de pions

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	—
Chaînes	—	● f7→g6, h7→g6
Passés	—	—
Majorité	—	—

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● b5 (2v0), ● d5 (2v1), ● e5 (2v0), ● g5 (2v0)	—
Cases faibles	—	—
Centre	● d4 (2v1), ● d5 (2v1), ● e5 (2v0)	—

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. 0)
Bf8		● Bf8 Non développé (mob. 2)
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	mobile
Ruptures	—	● …d7-d5, ● …e7-e5

A31f — English: Symmetrical, Two Knights, 3…g6

1.c4 c5 2.Nf3 Nf6 3.d4 g6 4.Nc3 * ● Trait aux Noirs

Ouverture — Centre mobile

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Plans. e4 (Occuper le centre — 38 % des parties) ; d5 (Occuper le centre — 12 % des parties) ; g3 (Préparer le fianchetto — 10 % des parties).

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Plans. ...Bg7 (Fianchetto, fou sur la grande diagonale — 62 % des parties) ; ...cxd4 (Capture en d4, Occuper le centre — 36 % des parties).

Avantages

Faiblesses

Diagonale active

Plans

Partie
1928 BCF Ch 21st – Round 11 – Barlow, Henry Stephens – 0-1 – Thomas, George Alan – G21 1. d4 Nf6 2. c4 c5 3. Nf3 g6 4. Nc3 Bg7 5. g3 Nc6 6. d5 Na5 7. e4 d6 8. h3 Bd7 9. Be3 O-O 10. Qd2 Re8
1936 Olympiad (unofficial) – Round 4 – Tuern, Johannes – 0-1 – Hromadka, Karel – G30 1. d4 Nf6 2. c4 c5 3. Nf3 g6 4. Nc3 b6 5. e4 Bb7 6. d5 d6 7. Bd2 Bg7 8. Qc1 O-O 9. Bh6 e6 10. Bxg7 Kxg7
1954 DDR Ch U20 – Round 4 – Moehring, Guenther – 0-1 – Eising, Johannes – G16 1. d4 Nf6 2. c4 g6 3. Nc3 c5 4. Nf3 Bg7 5. g3 O-O 6. Bg2 Nc6 7. e4 cxd4 8. Nxd4 Nxe4 9. Nxc6 Nxc3 10. Nxd8 Nxd1
1955 American Continental – Round 16 – Sanguinetti, Renato – 0-1 – Redolfi, Argentino Rodolfo – G11 1. d4 Nf6 2. c4 c5 3. Nf3 g6 4. Nc3 Bg7 5. e3 O-O 6. Be2 b6 7. O-O Bb7 8. Qc2 cxd4 9. Nxd4 d6 10. Rd1 Nbd7
1955 Hungary Ch – Round 1 – Jenei, Ferenc – 1/2-1/2 – Tapaszto Binet, Laszlo – G31 1. d4 Nf6 2. Nf3 c5 3. c4 g6 4. Nc3 Bg7 5. d5 O-O 6. Bg5 d6 7. e4 Qa5 8. Bd2 a6 9. Qc2 Re8 10. Be2 Nbd7
1955 Wch U20 final-B – Round 1 – Ciric, Dragoljub M – 0-1 – Lloyd, Kenneth – G1 1. d4 Nf6 2. c4 c5 3. Nf3 g6 4. Nc3 cxd4 5. Qxd4 Nc6 6. Qd1 Bg7 7. e4 O-O 8. Be2 b6 9. O-O Bb7 10. Rb1 Rc8
1958 Munich olm prel – Round 2 – Mashian, Yaacov – 1/2-1/2 – Palmason, Gudmundur – G42 1. d4 Nf6 2. c4 c5 3. Nf3 g6 4. Nc3 Bg7 5. e4 O-O 6. Be2 Nc6 7. dxc5 Qa5 8. O-O Qxc5 9. Be3 Qa5 10. Nd2 d6
1960 Leipzig olm fin-B – Round 8 – Robatsch, Karl – 1/2-1/2 – Jimenez Zerquera, Eleazar – G110 1. Nf3 Nf6 2. c4 c5 3. Nc3 g6 4. d4 Bg7 5. dxc5 Qa5 6. Nd2 Qxc5 7. e4 a6 8. Nb3 Qc7 9. Bg5 d6 10. Be2 Nbd7
1961 CAN Ch – Round 1 – Macskasy, Elod – 1-0 – Joyner, Lionel – G2 1. d4 Nf6 2. c4 c5 3. Nf3 g6 4. Nc3 Bg7 5. g3 O-O 6. Bg2 Nc6 7. dxc5 Qa5 8. O-O Qxc5 9. Qa4 d6 10. Be3 Qh5
1962 CSR Ch – Round 1 – Alster, Ladislav – 0-1 – Kavalek, Lubomir – G1 1. d4 Nf6 2. c4 c5 3. Nf3 g6 4. Nc3 Bg7 5. dxc5 O-O 6. e4 Qa5 7. e5 Ne4 8. Bd2 Nxd2 9. Qxd2 Nc6 10. Nd5 Qd8
1963 Halle zt – Round 1 – Minev, Nikolay N – 1-0 – Kavalek, Lubomir – G26 1. d4 Nf6 2. c4 c5 3. Nf3 g6 4. Nc3 Bg7 5. g3 O-O 6. Bg2 d5 7. dxc5 dxc4 8. Qa4 Na6 9. Qxc4 Be6 10. Qh4 Nxc5
1965 Chacabuco – Round 1 – Chocron, Alberto – 0-1 – Foguelman, Alberto – G5 1. d4 Nf6 2. c4 g6 3. Nc3 c5 4. Nf3 Bg7 5. e3 O-O 6. Be2 cxd4 7. Nxd4 Nc6 8. Nxc6 dxc6 9. Qxd8 Rxd8 10. e4 Nd7
1967 DEN Ch – Round 1 – Kolbak, Jens – 0-1 – Jakobsen, Ole – G1 1. d4 Nf6 2. c4 c5 3. Nf3 g6 4. Nc3 Bg7 5. g3 O-O 6. Bg2 d5 7. dxc5 Qa5 8. Qa4 Qxc5 9. cxd5 Nxd5 10. Nxd5 Qxd5
1968 Lugano ol (Men) fin-C – Round 13 – Weiss, Fernando – 0-1 – Zwaig, Arne – G29 1. d4 Nf6 2. c4 c5 3. Nf3 g6 4. Nc3 Bg7 5. g3 O-O 6. Bg2 cxd4 7. Nxd4 Qc7 8. Qd3 Nc6 9. Nxc6 bxc6 10. O-O Ba6
1975 URS Team Ch – Round 5 – Zamruk, Aleksandar – 1/2-1/2 – Yurtaev, Leonid – G98 1. d4 Nf6 2. c4 c5 3. Nf3 g6 4. Nc3 Bg7 5. dxc5 Qa5 6. Bd2 Qxc5 7. Rc1 Nc6 8. e3 O-O 9. Be2 d6 10. O-O a6

A31f — Symmetrical, Two Knights (1928)

1.c4 c5 2.Nf3 Nf6 3.d4 g6 4.Nc3

Les coups candidats

4…cxd4 — 60.4% (4370 parties)

Ambassadeurs : Cebalo, Miso (17x), Adamski, Jan (13x), Andersson, Ulf (12x), Bellon Lopez, Juan Manuel (9x), Arias Hernandez, Scarlett Terry (9x), Eberth, Zoltan Bela (8x), ? (8x), Pytel, Krzysztof (7x)

4…Bg7 — 37.9% (2741 parties)

Ambassadeurs : Pytel, Krzysztof (9x), Madl, Ildiko (8x), Kountz, Jochen (7x), Ghitescu, Theodor (5x), Letelier Martner, Rene (4x), Trifunovic, Petar (4x), Kavalek, Lubomir (4x), Popov, Luben (4x)

4…b6 — 0.6% (42 parties)

Ambassadeurs : Rostrom, R. (2x), Burschowsky, Matthias (2x), Rosien, Thomas (1x), Cartu, Jasper Eliezar (1x), Varga, Gyula (1x), Tamasi, Albert (1x), Dakins, J. (1x), Doeserich, Juergen (1x)

4…e6 — 0.2% (17 parties)

Ambassadeurs : Ortiz, Israel (2x), Berube, Richard (1x), Daigle, Rejean (1x), Korchagin, Oleg (1x), Dusman, Aleksander (1x), Losicki, Michal (1x), Muzyka J (1x), Lopez Rivers, Wendel Ricardo (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	4…cxd4	4…Bg7	4…b6	4…e6
<1800	374	54%	44%	1%	0%
1800-2200	3013	60%	39%	1%	0%
2200-2600	2813	65%	34%	0%	—
2600+	29	93%	7%	—	—

Évolution par décennie (% des parties)

Décennie	N parties	4…cxd4	4…Bg7	4…b6	4…e6
1950s	39	31%	69%	—	—
1960s	107	36%	64%	—	—
1970s	297	51%	47%	—	—
1980s	428	54%	45%	—	0%
1990s	1600	58%	40%	1%	1%
2000s	2080	62%	37%	1%	0%
2010s	2282	64%	35%	1%	0%
2020s	397	68%	32%	—	—

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
4…cxd4	64%	68%	▲ +3.7%
4…Bg7	35%	32%	▼ -2.9%
4…b6	1%	0%	▼ -0.7%
4…e6	0%	0%	-0.1%

Joueurs célèbres

Champions du monde dans cette position

Karpov, Anatoly — 5 parties
Tal, Mikhail — 1 partie
Kasparov, Garry — 1 partie
Carlsen, Magnus — 1 partie

Parties historiques

4…cxd4 — 60.4% (4370 parties)

1950 — Sarosy, Zoltan L vs K, Samuel Jeba — 1-0 — Toronto CAN
1951 — Musmann, Lothar vs Stahl, Franz — 1-0 — Leipzig GER
1952 — Casas Perea, Fernando vs Patt Rubinstein, Jacobo — 1-0 — Buenos Aires ARG
1954 — Chistiakov, Alexander vs Suetin, Alexey S — 0-1 — Riga LAT
1954 — Szabo, Laszlo vs Benko, Pal — 1/2-1/2 — Budapest HUN

4…Bg7 — 37.9% (2741 parties)

1951 — Rabar, Braslav vs Trifunovic, Petar — 1/2-1/2 — Ljubljana
1951 — Wade, Robert G vs Czerniak, Moshe — 0-1 — Reggio Emilia ITA
1953 — Newman, Richard vs Barden, Leonard — 0-1 — Hastings ENG
1954 — Moehring, Guenther vs Eising, Johannes — 0-1 — Schkopau
1954 — Sokolsky, Alexey vs Shamkovich, Leonid — 1/2-1/2 — Kiev ch-URS

4…b6 — 0.6% (42 parties)

1991 — Rosien, Thomas vs Cartu, Jasper Eliezar — 1-0 — St Ingbert
1991 — Dakins, J. vs Rostrom, R. — 0-1 — E Lansing ch-MI opB
1991 — Gatonye Dylan Gitau vs Rostrom, R. — 1-0 — Detroit Hart Plaza op
1992 — Haselhorst, Helmut vs Jung, Karl-Otto — 1/2-1/2 — St Ingbert
1993 — Varga, Gyula vs Tamasi, Albert — 1/2-1/2 — Kobanya

4…e6 — 0.2% (17 parties)

1983 — Berube, Richard vs Daigle, Rejean — 1-0 — Quebec CAN
1993 — Lopez Rivers, Wendel Ricardo vs Alkon, S. — 1-0 — Bratislava WchJM-U18
1996 — Simeone, Giulio vs Blonna, Michele — 1-0 — Rome ITA
1996 — Dadaniak, Tilman vs Luess, Hannes — 1/2-1/2 — Lingen
1996 — Stosius, Juergen vs Mathias, Manfred — 1-0 — ?

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