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 (2v1), ● b5 (2v0), ● d6 (2v1)	—
Cases faibles	—	—
Centre	● d4 (2v1), ● d5 (3v2)	● e5 (1v0)

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)	3 (● 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

A33h — English: Symmetrical, Two Knights, 5.Nc3 Nc6 6.Ndb5 Bb4

1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6 5.Nc3 Nc6 6.Ndb5 Bb4 * ○ Trait aux Blancs

Ouverture — Centre mobile

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Plans. Bf4 (Fou actif (mobilité 10), Développer c1 — 50 % des parties) ; a3 (Préparer expansion aile dame — 41 % des parties) ; Nd6+ (Cavalier actif en d6 — 6 % des parties).

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Plans. ...O-O (Mettre le roi en sécurité, connecter les tours — 44 % des parties) ; ...Bxc3+ (Fou actif (mobilité 7) — 41 % des parties) ; ...Ke7 (6 % des parties).

Avantages

Faiblesses

Diagonale active

Plans

Partie
1923 Karlsbad – Round 16 – Nimzowitsch, Aron – 1-0 – Tarrasch, Siegbert – G140 1. Nf3 Nf6 2. c4 c5 3. Nc3 Nc6 4. d4 cxd4 5. Nxd4 e6 6. Ndb5 Bb4 7. Bf4 O-O 8. Bd6 Bxd6 9. Nxd6 Ne8 10. e3 Qb6
1941 Munchen – Round 8 – Rethy, Pal – 0-1 – Foltys, Jan – G68 1. Nf3 c5 2. c4 Nf6 3. Nc3 Nc6 4. d4 cxd4 5. Nxd4 e6 6. Ndb5 Bb4 7. a3 Bxc3+ 8. Nxc3 d5 9. e3 O-O 10. Be2 dxc4
1957 URS Ch, semi final – Round 14 – Blagidze, Alexander – 0-1 – Geller, Efim P – G125 1. d4 Nf6 2. c4 c5 3. Nf3 cxd4 4. Nxd4 Nc6 5. Nc3 e6 6. Ndb5 Bb4 7. a3 Bxc3+ 8. Nxc3 d5 9. e3 O-O 10. cxd5 exd5
1961 Moskou – Round 1 – Khasin, A. – 1/2-1/2 – Stein, Leon Rico – G11 1. c4 Nf6 2. Nc3 c5 3. Nf3 Nc6 4. d4 cxd4 5. Nxd4 e6 6. Ndb5 Bb4 7. a3 Bxc3+ 8. Nxc3 d5 9. e3 O-O 10. cxd5 exd5
1961 Zevenaar – Round 2 – Lehmann, Heinz – 1/2-1/2 – Langeweg, Kick – G25 1. d4 Nf6 2. c4 c5 3. Nf3 e6 4. Nc3 cxd4 5. Nxd4 Nc6 6. Ndb5 Bb4 7. a3 Bxc3+ 8. Nxc3 d5 9. cxd5 exd5 10. e3 O-O
1963 Leningrad ch-URS – Round 1 – Polugaevsky, Lev – 1/2-1/2 – Kholmov, Ratmir D – G6 1. c4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Ndb5 Bb4 7. Bg5 O-O 8. e3 a6 9. Nd6 Qa5 10. Bxf6 gxf6
1964 Bordeaux Open – Round 10 – Roos, Michel – 1/2-1/2 – Sanner, Michel – G32 1. c4 c5 2. Nc3 e6 3. Nf3 Nc6 4. d4 cxd4 5. Nxd4 Nf6 6. Ndb5 Bb4 7. Bf4 O-O 8. Bc7 Qe7 9. Bd6 Bxd6 10. Nxd6 Ne8
1964 Tel Aviv olm fin-A – Round 11 – Szabo, Ladislav – 1-0 – Langeweg, Kick – G227 1. c4 c5 2. Nc3 Nf6 3. Nf3 Nc6 4. d4 cxd4 5. Nxd4 e6 6. Ndb5 Bb4 7. Bf4 d5 8. Nc7+ Ke7 9. Nxa8 d4 10. a3 Ba5
1965 URS-ch33 Tallinn EST – Round 1 – Osnos, Viatcheslav – 1/2-1/2 – Furman, Slavomir – G15 1. Nf3 Nf6 2. c4 c5 3. Nc3 Nc6 4. d4 cxd4 5. Nxd4 e6 6. Ndb5 Bb4 7. a3 Bxc3+ 8. Nxc3 d5 9. e3 O-O 10. Be2 dxc4
1966 Sarajevo – Round 10 – Pachman, Ludek – 1/2-1/2 – Matulovic, Milan – G33 1. d4 Nf6 2. c4 c5 3. Nf3 cxd4 4. Nxd4 Nc6 5. Nc3 e6 6. Ndb5 Bb4 7. Bf4 O-O 8. Bd6 Bxd6 9. Nxd6 Qb6 10. Qd2 Ne8
1966 Sukhumi – Round 2 – Kholmov, Ratmir D – 1/2-1/2 – Matulovic, Milan – G17 1. Nf3 c5 2. c4 Nf6 3. Nc3 Nc6 4. d4 cxd4 5. Nxd4 e6 6. Ndb5 Bb4 7. a3 Bxc3+ 8. Nxc3 d5 9. e3 O-O 10. cxd5 exd5
1967 YUG-URS – Round 1 – Gipslis, Aivars – 1/2-1/2 – ? – G2 1. d4 Nf6 2. c4 c5 3. Nf3 cxd4 4. Nxd4 Nc6 5. Nc3 e6 6. Ndb5 Bb4 7. a3 Bxc3+ 8. Nxc3 d5 9. e3 O-O 10. Be2 dxc4
1968 Monte Carlo – Round 2 – Smyslov, Vladimir – 1/2-1/2 – Hort, Vlastimil – G9 1. d4 Nf6 2. c4 c5 3. Nf3 cxd4 4. Nxd4 Nc6 5. Nc3 e6 6. Ndb5 Bb4 7. a3 Bxc3+ 8. Nxc3 d5 9. cxd5 exd5 10. e3 O-O
1968 Toth Memorial – Round 8 – Doda, Zbigniew – 1/2-1/2 – Forintos, Gyozo V – G26 1. c4 c5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 cxd4 5. Nxd4 e6 6. Ndb5 Bb4 7. a3 Bxc3+ 8. Nxc3 d5 9. Bg5 d4 10. Ne4 Qa5+
1969 Liberation – Round 6 – Polugaevsky, Lev – 1-0 – Gligorić, Svetozar – G27 1. c4 c5 2. Nf3 Nf6 3. Nc3 Nc6 4. d4 cxd4 5. Nxd4 e6 6. Ndb5 Bb4 7. Bf4 O-O 8. Bd6 Bxd6 9. Nxd6 Qa5 10. e3 a6
1969 Schwerin – Round 12 – Golz, Werner – 1-0 – Neukirch, Detlef – G90 1. Nf3 Nf6 2. c4 c5 3. d4 cxd4 4. Nxd4 e6 5. Nc3 Nc6 6. Ndb5 Bb4 7. a3 Bxc3+ 8. Nxc3 d5 9. Bg5 dxc4 10. Qxd8+ Nxd8
Bugojno 1980 – Round 1 – Polugaevsky, Lev – 1/2-1/2 – Hort, Vlastimil – G1 1. c4 c5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 cxd4 5. Nxd4 e6 6. Ndb5 Bb4 7. Bf4 O-O 8. Bd6 Bxd6 9. Nxd6 Ne8 10. Nxe8 Rxe8
Bugojno 1980 – Round 8 – Polugaevsky, Lev – 1/2-1/2 – Hort, Vlastimil – G30 1. c4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Ndb5 Bb4 7. Bf4 O-O 8. Bd6 Bxd6 9. Nxd6 Ne8 10. Nxe8 Rxe8
Bugojno 1982 – Round ? – Ljubojevic, Ljubomir – 1/2-1/2 – Andersson, Ulf 1949 – G71 1. c4 c5 2. Nf3 Nf6 3. Nc3 Nc6 4. d4 cxd4 5. Nxd4 e6 6. Ndb5 Bb4 7. Bf4 O-O 8. Bc7 Qe7 9. Bd6 Bxd6 10. Qxd6 Qd8
Johannesburg 1981 – Round 2 – Korchnoi, Viktor – 1-0 – Andersson, Ulf 1949 – G1 1. c4 c5 2. Nf3 Nf6 3. Nc3 Nc6 4. d4 cxd4 5. Nxd4 e6 6. Ndb5 Bb4 7. Bf4 O-O 8. Bd6 Bxd6 9. Nxd6 Ne8 10. e3 Qb6

A33h — Symmetrical, Two Knights (1923)

1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6 5.Nc3 Nc6 6.Ndb5 Bb4

Les coups candidats

7.Bf4 — 50.0% (135 parties)

Ambassadeurs : Polugaevsky, Lev (7x), Korchnoi, Viktor (5x), De Firmian, Nick (4x), Szabo, Laszlo (3x), Andersson, Ulf (3x), Dvoirys, Semen I. (3x), Ornstein, Axel (2x), Hort, Vlastimil (2x)

7.a3 — 41.1% (111 parties)

Ambassadeurs : Hort, Vlastimil (2x), Doda, Zbigniew (2x), Saidy, Anthony (2x), Gonzalez, Gerardo (2x), Forintos, Gyozo V (2x), ? (2x), Gipslis, Aivars (1x), Blagidze, Alexander (1x)

7.Nd6+ — 6.3% (17 parties)

Ambassadeurs : Johnson O Abraham (1x), Thomason, Alan (1x), Gauglitz, Gernot (1x), Enders, Peter (1x), Martin Gonzalez, Angel (1x), Colls Gelaberto, Emili (1x), Reinderman, Dimitri (1x), Shahade, Gregory (1x)

7.Bg5 — 1.9% (5 parties)

Ambassadeurs : Polugaevsky, Lev (1x), Kholmov, Ratmir D (1x), Thal, Olaf (1x), Rossmann, Helmut (1x), Taksrud, Vidar (1x), Mikenas, Alius (1x), Mateia, Benone-Nicolae (1x), Vasquez, Fernando (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	7.Bf4	7.a3	7.Nd6+	7.Bg5
<1800	8	50%	38%	—	12%
1800-2200	52	27%	48%	21%	4%
2200-2600	144	57%	38%	3%	1%
2600+	17	82%	18%	—	—

Évolution par décennie (% des parties)

Décennie	N parties	7.Bf4	7.a3	7.Nd6+	7.Bg5
1950s	2	—	100%	—	—
1960s	20	25%	70%	—	5%
1970s	25	44%	52%	—	4%
1980s	45	71%	24%	4%	—
1990s	41	49%	32%	17%	—
2000s	74	57%	39%	3%	—
2010s	51	37%	47%	10%	6%
2020s	12	50%	42%	8%	—

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
7.Bf4	37%	50%	▲ +12.7%
7.a3	47%	42%	▼ -5.4%
7.Nd6+	10%	8%	▼ -1.5%
7.Bg5	6%	0%	▼ -5.9%

Parties historiques

7.Bf4 — 50.0% (135 parties)

1964 — Szabo, Laszlo vs Langeweg, Kick — 1-0 — Tel Aviv olm
1964 — Roos, Michel vs Sanner, Michel — 1/2-1/2 — Bordeaux FRA
1966 — Pachman, Ludek vs Matulovic, Milan — 1/2-1/2 — Sarajevo BIH
1968 — Abramson, Horacio vs Reznik, Yakov — 1/2-1/2 — cr.
1969 — Polugaevsky, Lev vs Gligoric, Sofija — 1-0 — Belgrade SRB

7.a3 — 41.1% (111 parties)

1957 — Blagidze, Alexander vs Geller, Efim P. — 0-1 — Kiev UKR
1957 — Illgen, Hans vs Soelter, Reinhold — 1/2-1/2 — Brakel
1960 — Kottnauer, Cenek vs Clarke, Peter — 1/2-1/2 — Paignton
1961 — Lehmann, Heinz vs Langeweg, Kick — 1/2-1/2 — Zevenaar
1961 — Khasin, Abram vs Stein, Leonid — 1/2-1/2 — Moskou

7.Nd6+ — 6.3% (17 parties)

1981 — Johnson O Abraham vs Thomason, Alan — 1-0 — cr.
1982 — Gauglitz, Gernot vs Enders, Peter — 0-1 — Dresden GER
1991 — Fernandez Murga, Roberto vs Izeta Txabarri, Felix — 0-1 — Osuna
1991 — Stolfa, Jaroslav vs Blaha, Petr — 1/2-1/2 — Bratislava SVK
1995 — De La Rosa, Damian vs Roder, Peter Ulrik — 1/2-1/2 — Tjele ch-DEN jr

7.Bg5 — 1.9% (5 parties)

1963 — Polugaevsky, Lev vs Kholmov, Ratmir D — 1/2-1/2 — Leningrad ch-URS
1975 — Thal, Olaf vs Rossmann, Helmut — 1/2-1/2 — Stralsund GER
2012 — Mateia, Benone-Nicolae vs Vasquez, Fernando — 0-1 — FICGS
2012 — Jimenez Almeida, Luis David vs Hernando Rodrigo, Jose Maria — 0-1 — Navarra
2014 — Taksrud, Vidar vs Mikenas, Alius — 0-1 — Vilnius LTU

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