Structure de pions

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	—
Chaînes	—	● d7→e6, f7→e6
Passés	—	—
Majorité	● aile dame 3v2	—

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● d4 (2v0), ● b5 (2v0), ● d6 (2v1)	—
Cases faibles	—	—
Centre	● d4 (2v0), ● d5 (3v2)	—

Colonnes et diagonales

	♔ Blancs	♚ Noirs
Semi-ouvertes	● d	● c

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 5)
Bf1	● Bf1 Non développé (mob. 0)
Bb4		● Bb4 Actif (mob. 7)
Bc8		● Bc8 Non développé (mob. 0)
Paire de fous	● Oui	● Oui
Clouages	● knight c3	—
Non développées	4 (● c1, ● f1, ● a1, ● h1)	4 (● b8, ● c8, ● 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

A32t — English: Symmetrical, Two Knights, 5.Nc3 Bb4 6.Nb5

1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6 5.Nc3 Bb4 6.Nb5 * ● Trait aux Noirs

Ouverture — Centre mobile

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Plans. a3 (Préparer expansion aile dame — 36 % des parties) ; Bf4 (Fou actif (mobilité 10), Développer c1 — 36 % des parties) ; Nd6+ (Cavalier actif en d6 — 10 % des parties).

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Plans. ...d5 (Occuper le centre — 46 % des parties) ; ...O-O (Mettre le roi en sécurité, connecter les tours — 39 % des parties) ; ...a6 (Préparer expansion aile dame — 10 % des parties).

Avantages

Faiblesses

Diagonale active

Plans

Partie
1929 Karlsbad – Round 1 – Thomas, George Alan – 0-1 – Marshall Viele, Fabrizio Aaron – G31 1. d4 e6 2. Nf3 c5 3. c4 cxd4 4. Nxd4 Nf6 5. Nc3 Bb4 6. Nb5 O-O 7. Bf4 d5 8. e3 Nc6 9. a3 Ba5 10. b4 a6
1935 Luhacovice CZE – Round ? – Pelikan, Jorge – 0-1 – Fazekas, Stephan – G11 1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. Nc3 cxd4 5. Nxd4 Bb4 6. Nb5 O-O 7. a3 Be7 8. e4 Nc6 9. Bf4 e5 10. Bg5 Nxe4
1957 Leningrad Ch – Round ? – Bykov, Valery N. – 1-0 – Kondratiev, Pavel E – G152 1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. Nc3 cxd4 5. Nxd4 Bb4 6. Nb5 d5 7. cxd5 exd5 8. Bg5 O-O 9. Rc1 Bg4 10. h3 Bd7
1957 WchT U26 04th – Round 12.4 – Olafsson, Thorir – 0-1 – Gipslis, Aivars – G160 1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. Nc3 cxd4 5. Nxd4 Bb4 6. Nb5 d5 7. Bf4 O-O 8. e3 Nc6 9. a3 Ba5 10. b4 a6
1957 WchT U26 Reykjavik ISL – Round ? – Olafsson, Fridrik – 1/2-1/2 – Gipslis, Aivars – G10 1. d4 Nf6 2. c4 c5 3. Nf3 cxd4 4. Nxd4 e6 5. Nc3 Bb4 6. Nb5 d5 7. Bf4 O-O 8. e3 Nc6 9. a3 Ba5 10. b4 a6
1958 HUN Ch 13th – Round 16 – Florian, Tibor – 1/2-1/2 – Lengyel, Levente – G139 1. Nf3 Nf6 2. c4 e6 3. Nc3 c5 4. d4 cxd4 5. Nxd4 Bb4 6. Nb5 d5 7. cxd5 Nxd5 8. e4 Nxc3 9. Qxd8+ Kxd8 10. bxc3 Bc5
1958 Olympiad Munich GER – Round 8 – Rantanen, Martti – 1/2-1/2 – Prins, Laura – G9 1. d4 e6 2. c4 Nf6 3. Nc3 c5 4. Nf3 cxd4 5. Nxd4 Bb4 6. Nb5 a6 7. Nd6+ Ke7 8. Nxc8+ Qxc8 9. Qb3 Nc6 10. Bd2 Rd8
1959 CSR Ch – Round 8 – Alster, Ladislav – 1/2-1/2 – Pachman, Ludek – G62 1. d4 Nf6 2. c4 c5 3. Nf3 cxd4 4. Nxd4 e6 5. Nc3 Bb4 6. Nb5 O-O 7. a3 Bxc3+ 8. Nxc3 b6 9. Bg5 h6 10. Bh4 Bb7
1960 Asuncion – Round 1 – Estremera Panos, Sergio – 1/2-1/2 – Rossetto, Hector – G8 1. d4 Nf6 2. c4 e6 3. Nc3 c5 4. Nf3 cxd4 5. Nxd4 Bb4 6. Nb5 d5 7. Bf4 Na6 8. e3 O-O 9. a3 Bxc3+ 10. Nxc3 Qb6
1960 Buenos Aires ch-ARG – Round 1 – Espinosa Flores, Rafael Emilio – 1-0 – Goldenberg, Edgardo – G4 1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. Nc3 cxd4 5. Nxd4 Bb4 6. Nb5 O-O 7. Bf4 d5 8. e3 Nc6 9. a3 Bxc3+ 10. Nxc3 e5
1963 Capablanca Memorial – Round 14 – Uhlmann, Wolfgang – 0-1 – Barcza, Gedeon – G129 1. d4 e6 2. Nf3 c5 3. c4 cxd4 4. Nxd4 Nf6 5. Nc3 Bb4 6. Nb5 O-O 7. a3 Bxc3+ 8. Nxc3 d5 9. Bg5 h6 10. Bxf6 Qxf6
1964 Amsterdam Interzonal – Round 1 – Reshevsky, Samuel – 1/2-1/2 – Benko, Pal – G1 1. c4 c5 2. Nf3 Nf6 3. d4 cxd4 4. Nxd4 e6 5. Nc3 Bb4 6. Nb5 O-O 7. a3 Bxc3+ 8. Nxc3 d5 9. cxd5 exd5 10. e3 Nc6
1969 Malaga – Round 1 – Pomar Salamanca, Arturo – 1/2-1/2 – Marovic, Drazen – G3 1. d4 Nf6 2. c4 c5 3. Nf3 cxd4 4. Nxd4 e6 5. Nc3 Bb4 6. Nb5 a6 7. Nd6+ Ke7 8. Nxc8+ Qxc8 9. e3 d5 10. Qb3 Nc6
1970 Palma de Mallorca Interzonal – Round 19 – Reshevsky, Samuel – 1-0 – Polugaevsky, Lev – G76 1. d4 Nf6 2. c4 c5 3. Nf3 cxd4 4. Nxd4 e6 5. Nc3 Bb4 6. Nb5 O-O 7. a3 Bxc3+ 8. Nxc3 d5 9. Bg5 h6 10. Bh4 10. ... g5
1970 Palma de Mallorca Interzonal – Round 23 – Aiza Jimenez, Enzo – 1/2-1/2 – Polugaevsky, Lev – G74 1. d4 Nf6 2. c4 c5 3. Nf3 cxd4 4. Nxd4 e6 5. Nc3 Bb4 6. Nb5 d5 7. cxd5 exd5 8. a3 Bxc3+ 9. bxc3 O-O 10. e3 Ne4
Alekhine Memorial 1971 – Round 1 – Olafsson, Fridrik – 1-0 – Tal, Mikhail – G9 1. d4 Nf6 2. c4 c5 3. Nf3 cxd4 4. Nxd4 e6 5. Nc3 Bb4 6. Nb5 O-O 7. a3 Bxc3+ 8. Nxc3 d5 9. Bg5 h6 10. Bxf6 Qxf6
Interpolis 1989 – Round 1 – Korchnoi, Viktor – 1-0 – Hjartarson, Johann – G1 1. c4 c5 2. Nf3 Nf6 3. Nc3 e6 4. d4 cxd4 5. Nxd4 Bb4 6. Nb5 O-O 7. a3 Bxc3+ 8. Nxc3 d5 9. Bg5 Nc6 10. e3 d4
Luzern olm 1982 – Round 2 – Carranza Cifuentes, Ricardo – 0-1 – Tal, Mikhail – G10 1. d4 Nf6 2. Nf3 e6 3. c4 c5 4. Nc3 cxd4 5. Nxd4 Bb4 6. Nb5 d5 7. Bf4 O-O 8. e3 a6 9. a3 Ba5 10. Nd6 Nc6
Thessaloniki olm 1988 – Round 13 – Xu, Jun(SD) – 0-1 – Portisch, Lajos – G123 1. Nf3 e6 2. c4 c5 3. Nc3 Nf6 4. d4 cxd4 5. Nxd4 Bb4 6. Nb5 a6 7. Nd6+ Ke7 8. Nxc8+ Qxc8 9. Qb3 Nc6 10. Bd2 d6

A32t — Symmetrical, Two Knights (1929)

1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6 5.Nc3 Bb4 6.Nb5

Les coups candidats

6…d5 — 41.0% (180 parties)

Ambassadeurs : Polugaevsky, Lev (3x), Gipslis, Aivars (2x), Olafsson, Thorir (2x), Debarnot, Roberto (2x), Rubinetti, Jorge (2x), Lengyel, Levente (2x), Tal, Mikhail (2x), Dubin, Adi (2x)

6…O-O — 40.8% (179 parties)

Ambassadeurs : Planinec, Albin (3x), Rapaka Samuel Paul (2x), Espinosa Flores, Rafael Emilio (2x), Vaganian, Rafael A (2x), Onoda, Hirokaz (2x), Renteria Becerra, Jorge Eliecer (2x), Hnydiuk, Aleksander (2x), Alster, Ladislav (1x)

6…a6 — 11.8% (52 parties)

Ambassadeurs : McCormick, James (2x), Xu, Jun (2x), Portisch, Lajos (2x), Groth, Klaus-Ulrich Dr (2x), Arnold, Marc (2x), Pomar Salamanca, Arturo (1x), Marovic, Drazen (1x), Rantanen, Yrjo A. (1x)

6…Nc6 — 2.5% (11 parties) →

Ambassadeurs : Bystrov, Sergey V. (1x), Maryasin, Boris (1x), Amos, Bruce M. (1x), Evans, Larry (1x), Mascarenhas, Alberto Pinheiro (1x), Van Riemsdijk, Herman C. (1x), Gunawan, Ronny (1x), Hulak, Krunoslav (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	6…d5	6…O-O	6…a6	6…Nc6
<1800	8	25%	25%	38%	—
1800-2200	112	41%	40%	9%	4%
2200-2600	236	41%	41%	14%	3%
2600+	2	50%	50%	—	—

Évolution par décennie (% des parties)

Décennie	N parties	6…d5	6…O-O	6…a6	6…Nc6
1950s	11	55%	27%	18%	—
1960s	7	29%	57%	14%	—
1970s	60	55%	30%	8%	3%
1980s	59	34%	53%	8%	5%
1990s	82	38%	39%	16%	—
2000s	107	41%	43%	10%	4%
2010s	102	41%	37%	13%	2%
2020s	11	18%	64%	18%	—

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
6…d5	41%	18%	▼ -23.0%
6…O-O	37%	64%	▲ +26.4%
6…a6	13%	18%	▲ +5.4%
6…Nc6	2%	0%	▼ -2.0%

Joueurs célèbres

Champions du monde dans cette position

Tal, Mikhail — 3 parties
Botvinnik, Mikhail — 1 partie
Ju, Wenjun — 1 partie

Parties historiques

6…d5 — 41.0% (180 parties)

1957 — Olafsson, Fridrik vs Gipslis, Aivars — 1/2-1/2 — WchT U26 Reykjavik ISL
1957 — Roos, Michel vs Saint-Germain, Gaston de — 1-0 — cr ch FRA
1957 — Miroshnichenko, Aleksander vs Abanin, Vladimir — 1/2-1/2 — Ashkhabad
1957 — Bykov, Valery N. vs Efimov, Kondrat — 1-0 — Leningrad RUS
1957 — Olafsson, Thorir vs Gipslis, Aivars — 0-1 — Reykjavik ISL

6…O-O — 40.8% (179 parties)

1954 — Pedersen, Ebbe vs Filip, Marius Liviu — 0-1 — Prague zt
1956 — Letelier Martner, Rene vs Johannsson, Isak Gunnsteinn — 1/2-1/2 — Moskou olm
1959 — Alster, Ladislav vs Pachman, Ludek — 1/2-1/2 — Bratislava SVK
1960 — Espinosa Flores, Rafael Emilio vs Goldenberg, Edgardo — 1-0 — Buenos Aires ch-ARG
1960 — Espinosa Flores, Rafael Emilio vs Miguel, Nahuel — 1/2-1/2 — Buenos Aires ch-ARG

6…a6 — 11.8% (52 parties)

1957 — Bykov, Vladimir vs Spassky, Boris V. — 1/2-1/2 — Leningrad RUS
1958 — Rantanen, Yrjo A. vs Prins, Lodewijk — 1/2-1/2 — Munchen olm
1969 — Pomar Salamanca, Arturo vs Marovic, Drazen — 1/2-1/2 — Malaga ESP
1971 — Benko, Pal vs Quinteros, Miguel A. — 1/2-1/2 — Malaga ESP
1972 — Krisko, Milan vs Sikora-Lerch, Jan — 0-1 — Trinec CZE

6…Nc6 — 2.5% (11 parties)

1973 — Amos, Bruce M. vs Evans, Larry — 1/2-1/2 — USA op Chicago, IL USA
1976 — Rath, Ulrik vs Fedder, Steen — 1/2-1/2 — Aarhus DEN
1983 — Gunawan, Ronny vs Hulak, Krunoslav — 1/2-1/2 — Jakarta / Yogya / Bali
1986 — Mascarenhas, Alberto Pinheiro vs Van Riemsdijk, Herman C. — 1/2-1/2 — Garanhuns
1987 — Bystrov, Sergey V. vs Maryasin, Boris — 1/2-1/2 — Minsk BLR

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