Structure de pions

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	—
Chaînes	—	● b7→a6
Passés	—	—
Majorité	—	—

Cases

	♔ Blancs	♚ Noirs
Cases fortes	—	● b4 (2v0), ● d4 (2v1)
Cases faibles	—	—
Centre	● d5 (1v0)	● d4 (2v1)

Colonnes et diagonales

♔ Blancs

♚ Noirs

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 0)
Bb5	● Bb5 Actif (mob. 7)
Bc8		● Bc8 Non développé (mob. 0)
Bf8		● Bf8 Non développé (mob. 5)
Paire de fous	● Oui	● Oui
Non développées	4 (● b1, ● c1, ● a1, ● h1)	5 (● g8, ● 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	● d2-d4	● …d7-d5, ● …f7-f5

C68a — Spanish: 3…a6

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 * ○ Trait aux Blancs

Ouverture — Centre fermé

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

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Plans. Ba4 (Clouer c6 — 90 % des parties) ; Bxc6 (Clouer d7, Fou actif (mobilité 5) — 10 % des parties).

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

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Plans. ...Nf6 (Développer g8 — 75 % des parties) ; ...d6 (Libérer Bc8 — 11 % des parties).

Avantages

Faiblesses

Diagonale active

Plans

Partie
1962 Marianske Lazne – Round 2 – Marsalek, Josef – 0-1 – Ghitescu, Theodor – G19 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Be2 Nf6 5. d3 d5 6. Nbd2 Be7 7. c3 O-O 8. O-O h6 9. Re1 Be6 10. Bf1 Nd7

C68a — Morphy Defense (1962)

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6

Les coups candidats

4.Ba4 — 87.5% (306741 parties) →

Ambassadeurs : ? (862x), Geller, Efim P. (386x), Ivkov, Borislav (357x), Tal, Mikhail (328x), Kholmov, Ratmir D (297x), Unzicker, Ferdinand, Dr. (290x), Matanovic, Aleksandar (284x), Herzog, Klaus (257x)

4.Bxc6 — 12.3% (43161 parties) →

Ambassadeurs : Rozentalis, Eduardas (149x), ? (101x), Sherwood, Russell (78x), Hebden, Mark L (59x), Herzog, Klaus (58x), Yandemirov, Valeri (57x), Moody, David W (54x), Gaujens, Artis (53x)

4.Bc4 — 0.2% (548 parties) →

Ambassadeurs : Rivas Romero, Guillermo (5x), Yuen, Wing-yan (3x), Bismuth, Sarah (3x), Kshnyakin, Alexandr (3x), Lukovic, Vladimir (3x), Ardelean, Rusalim-Pavel (3x), Vieira, Irene (2x), ? (2x)

4.Be2 — 0.0% (42 parties)

Ambassadeurs : Afizov, Marsel (1x), Ghitescu, Theodor (1x), Queiroz Mosart S (1x), Goncalves Junior, Carlos Chilon (1x), Alderman, Mike (1x), Becker, Brian R (1x), Espinoza, Eduardo (1x), Santisteban, Marilin (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	4.Ba4	4.Bxc6	4.Bc4	4.Be2
<1800	22553	84%	16%	0%	0%
1800-2200	122166	87%	13%	0%	0%
2200-2600	131370	90%	10%	0%	0%
2600+	9833	94%	6%	—	—

Évolution par décennie (% des parties)

Décennie	N parties	4.Ba4	4.Bxc6	4.Bc4	4.Be2
1950s	5336	97%	3%	0%	—
1960s	9967	94%	6%	0%	0%
1970s	11737	86%	14%	0%	—
1980s	18088	88%	12%	0%	—
1990s	47083	83%	16%	0%	0%
2000s	87916	84%	16%	0%	0%
2010s	122993	88%	11%	0%	0%
2020s	47430	94%	6%	0%	0%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
4.Ba4	88%	94%	▲ +5.1%
4.Bxc6	11%	6%	▼ -5.0%
4.Bc4	0%	0%	-0.1%
4.Be2	0%	0%	-0.0%

Joueurs célèbres

Champions du monde dans cette position

Tal, Mikhail — 10 parties
Karpov, Anatoly — 10 parties
Botvinnik, Mikhail — 10 parties
Smyslov, Vladimir — 10 parties
Karpov, Aleksandr — 10 parties
Kasparov, Garry — 10 parties
Anand, Viswanathan — 10 parties
Kramnik, Vladimir — 10 parties
Carlsen, Magnus — 10 parties
Hou, Yifan — 10 parties
Ju, Wenjun — 10 parties
Ding, Liren — 10 parties
Gukesh D — 10 parties
Smyslov, Vassily — 4 parties
Lasker, Emanuel — 2 parties
Fischer, Robert James — 1 partie

Parties historiques

4.Ba4 — 87.5% (306741 parties)

1950 — Janda, Pavel vs Muller, Hans P — 0-1 — Switzerland
1950 — Siemms, Ross E vs Anderson, Frank Ross — 0-1 — Toronto CAN
1950 — Castillo Bermudez, Manuel vs Eken, Max — 1/2-1/2 — Dubrovnik CRO
1950 — Smyslov, Vasily vs Castillo Bermudez, Manuel — 1-0 — Venice ITA
1950 — Kampman, Tijmen vs Illgen, Hans — 1/2-1/2 — Bielefeld

4.Bxc6 — 12.3% (43161 parties)

1950 — Matokhin, A. vs Tolush, Alexander — 1-0 — RSFSR tt
1950 — Warburton, Charles vs Dancer, VC. — 1-0 — Cheshire Cup
1950 — Harris, Peter A vs Olafsson, Fridrik — 1/2-1/2 — Birmingham ENG
1950 — Rudenko, Ludmila vs Chaude de Silans, Chantal — 1/2-1/2 — Moscow RUS
1950 — Henneberger, Walter vs Batchinsky, Basile — 1-0 — Lucerne SUI

4.Bc4 — 0.2% (548 parties)

1956 — Ihle, Robert vs Grothe, W. — 1-0 — cr.
1966 — Benis Ahmed vs Morales Vargas, Emanuel de Jesus — 1-0 — ?
1970 — Rittner, Horst vs Steiner, Jamie — 1/2-1/2 — cr.
1971 — Wright, Anthony G vs Bergmanis, Olgerts — 1-0 — Melbourne AUS
1980 — Liao, Yuan Eu vs Araya Numana, Carlos — 1/2-1/2 — Mexico City MEX

4.Be2 — 0.0% (42 parties)

1962 — Afizov, Marsel vs Ghitescu, Theodor — 0-1 — Marianske Lazne
1992 — Klostermann, Eduard vs Brucker, Frank — 0-1 — Karlsruhe
1992 — Maier, Martin vs Krallmann, Matthias — 1/2-1/2 — Dortmund open I
1993 — Queiroz Mosart S vs Goncalves Junior, Carlos Chilon — 0-1 — ?
1993 — Hoareau, Patricia vs Macin Calderon Yanett — 0-1 — ?

1962 Marianske Lazne – Round 2 – Marsalek, Josef – 0-1 – Ghitescu, Theodor – G19