C49b — Four Knights: 4.Bb5 Bb4 5.O-O

1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.O-O * ● Trait aux Noirs

Ouverture — Centre fermé

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Avantages : case forte d5, Bb5 actif, paire de fous.
Faiblesses adverses : Bc8 enfermé, roi noir au centre.
Problèmes : Bc1 enfermé.
Plans :
● d3 — Libérer Bc1
● h3 — Empêcher ...Bg4
● c3 — Préparer d4

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Avantages : case forte d4, Bb4 actif, paire de fous.
Faiblesses adverses : Bc1 enfermé.
Problèmes : roi au centre, Bc8 enfermé, 3 pièces non développées (C8, A8, H8).
Plans :
● O-O — Mettre le roi en sécurité, connecter les tours
● ...d6 — Libérer Bc8
● ...Bg4 — Clouer Nf3
● ...d5 — Rupture

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

C49b —

1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.O-O

Eval: [+0.12]

Les coups candidats

5…O-O — 90.5% (7950 parties) →

Ambassadeurs : Jovanovic, Bratislav M (61x), Janowski, Dawid (49x), Capablanca, Jose (42x), Maroczy, Geza (40x), Teichmann, Richard (34x), Tarrasch, Siegbert (32x), Podlesnik, Bogdan (29x), Schlechter, Carl (27x)

5…d6 — 5.5% (485 parties)

Ambassadeurs : Lasker, Emanuel (4x), Menyhart, Tibor (3x), Feldvabl, Vilem (3x), Cohn, Wilhelm (2x), Devreese, Gert (2x), Tarrasch, Siegbert (2x), Capablanca, Jose (2x), Castillo Lynch, Jacob Tyler (2x)

5…Bxc3 — 3.2% (277 parties)

Ambassadeurs : Ilincic, Zlatko (8x), Englisch, Berthold (3x), White, Max (3x), Rosenthal, Samuel (2x), Riemann, Fritz (2x), Simlova, Kvetuse (2x), Graf, Alexander (2x), Papp, Nandor (2x)

5…Nd4 — 0.3% (30 parties)

Ambassadeurs : Nimzowitsch, Aron (2x), Mason, James (1x), Porges, Moritz (1x), Tartakower, Savielly (1x), Teichmann, Richard (1x), Wildschuetz Theo (1x), Engert, Immo (1x), Janowski, Dawid (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	5…O-O	5…d6	5…Bxc3	5…Nd4
<1800	213	86%	8%	5%	0%
1800-2200	2093	89%	7%	3%	0%
2200-2600	3462	94%	2%	3%	0%
2600+	212	99%	0%	0%	—

Évolution par décennie (% des parties)

Décennie	N parties	5…O-O	5…d6	5…Bxc3	5…Nd4
1870s	9	67%	—	33%	—
1880s	70	86%	6%	9%	—
1890s	95	96%	2%	1%	1%
1900s	262	93%	5%	2%	0%
1910s	257	97%	2%	—	1%
1920s	181	97%	2%	1%	—
1930s	93	96%	1%	2%	1%
1940s	103	96%	2%	2%	—
1950s	121	98%	1%	2%	—
1960s	100	90%	6%	1%	3%
1970s	113	93%	3%	4%	—
1980s	235	93%	4%	3%	1%
1990s	1442	87%	7%	4%	0%
2000s	2103	88%	7%	4%	0%
2010s	2711	91%	5%	3%	0%
2020s	890	93%	4%	3%	—

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
5…O-O	91%	93%	▲ +1.2%
5…d6	5%	4%	▼ -1.2%
5…Bxc3	3%	3%	+0.3%
5…Nd4	0%	0%	-0.4%

Joueurs célèbres

Champions du monde dans cette position

Lasker, Emanuel — 10 parties
Alekhine, Alexander — 10 parties
Euwe, Max — 10 parties
Smyslov, Vladimir — 8 parties
Botvinnik, Mikhail — 6 parties
Tal, Mikhail — 6 parties
Anand, Viswanathan — 6 parties
Carlsen, Magnus — 5 parties
Steinitz, Wilhelm — 4 parties
Karpov, Anatoly — 4 parties
Hou, Yifan — 3 parties
Karpov, Aleksandr — 2 parties
Ju, Wenjun — 2 parties

Parties historiques

5…O-O — 90.5% (7950 parties)

1877 — Paulsen, Louis vs Goering, Carsta — 1-0 — Leipzig GER
1879 — Bier, Max vs Minckwitz, Johannes — 0-1 — Leipzig GER
1879 — Paulsen, Louis vs Adolf, Feraydo — 1-0 — Leipzig GER
1879 — Paulsen, Louis vs Bier, Max — 1-0 — Leipzig GER
1879 — Adolf, Feraydo vs Englisch, Berthold — 0-1 — Leipzig GER

5…d6 — 5.5% (485 parties)

1885 — Zukertort, Johannes vs Gifford, Birkmyre H — 1/2-1/2 — Paris FRA
1886 — Van Foreest, Dirk vs Prange Harrer, Jacob — 1-0 — Utrecht NED
1889 — Wlach vs Mavilis, Lorenzo — 0-1 — Breslau GER
1889 — Wlach, A.. vs Mavilis, Lorentzos — 1-0 — Breslau GER
1894 — Walbrodt, Carl vs Cohn, Wilhelm — 1-0 — Berlin GER

5…Bxc3 — 3.2% (277 parties)

1871 — Bock, Frederick vs Judd, Max — 1/2-1/2 — Chicago, IL USA
1876 — Riemann, Fritz vs Anderssen, Adolf — 0-1 — Breslau GER
1878 — Metger, Johannes vs Minckwitz, Johannes — 1/2-1/2 — Frankfurt GER
1882 — Wittek, Alexander vs Englisch, Berthold — 1-0 — Vienna AUT
1882 — White, Max vs Englisch, Berthold — 1/2-1/2 — Vienna AUT

5…Nd4 — 0.3% (30 parties)

1892 — Mason, James vs Porges, Moritz — 0-1 — Dresden GER
1905 — Janowski, Dawid vs Schelfhout, Willem — 1-0 — Ostende
1911 — Nimzowitsch, Aron vs Tartakower, Savielly — 1-0 — Carlsbad CZE
1911 — Nimzowitsch, Aron vs Teichmann, Richard — 1-0 — Carlsbad CZE
1935 — Wildschuetz Theo vs Engert, Immo — 1-0 — Essen GER

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	—
Chaînes	—	—
Passés	—	—
Majorité	—	—

Cases

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

Colonnes et diagonales

♔ Blancs

♚ Noirs

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 0)
Bb5	● Bb5 Actif (mob. 6)
Bb4		● Bb4 Actif (mob. 7)
Bc8		● Bc8 Non développé (mob. 0)
Paire de fous	● Oui	● Oui
Non développées	2 (c1, a1)	3 (c8, a8, h8)

Sécurité du roi

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

Thèmes

	♔ Blancs	♚ Noirs
Phase	Ouverture
Centre	fermé
Ruptures	● d2-d3	● …d7-d6, ● …d7-d5

Partie
1902 USA tour sim – Round ? – Shipley, Walter P – 0-1 – Lasker, Emanuel – G14 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. Nc3 Bb4 5. O-O d6 6. Ne2 a6 7. Bxc6+ bxc6 8. c3 Bc5 9. Ng3 Bb6 10. d4 exd4
1905 It (Men) Stockholm SWE – Round 15 – Janowski, Dawid – 1-0 – Schelfhout, Willem – G55 1. e4 e5 2. Nf3 Nf6 3. Nc3 Nc6 4. Bb5 Bb4 5. O-O Nd4 6. Nxd4 exd4 7. e5 dxc3 8. bxc3 Be7 9. exf6 Bxf6 10. Ba3 c5
1907 BCF Ch 4th – Round 11 – Blackburne, Joseph – 1/2-1/2 – Mackenzie, Arthur J – G21 1. e4 e5 2. Nf3 Nf6 3. Nc3 Nc6 4. Bb5 Bb4 5. O-O d6 6. Nd5 Ba5 7. d4 a6 8. Nxf6+ gxf6 9. Bxc6+ bxc6 10. dxe5 fxe5
1907 Berlin Jubilee – Round 10 – Przepiorka, Dawid – 1-0 – Caro, Horatio – G44 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. Nc3 Bb4 5. O-O d6 6. d3 h6 7. Ne2 O-O 8. Ng3 Ne7 9. c3 Ba5 10. d4 Ng6
1911 Carlsbad – Round 1 – Nimzowitsch, Aron – 1-0 – Tartakower, Savielly – G13 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O Nd4 6. Nxd4 exd4 7. e5 dxc3 8. dxc3 Be7 9. exf6 Bxf6 10. Re1+ Kf8
1913 New York National – Round 12 – Jaffe, Charles – 1-0 – Kupchik, Abraham – G50 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O d6 6. Nd5 Bc5 7. d4 exd4 8. Bg5 a6 9. Bxc6+ bxc6 10. Nxf6+ gxf6
1947 Vienna SCHLECHTER-mem – Round 2 – Grob, Henry – 1-0 – Palda, Karl – G5 1. e4 e5 2. Nf3 Nf6 3. Nc3 Nc6 4. Bb5 Bb4 5. O-O Bxc3 6. bxc3 O-O 7. Re1 d6 8. h3 Ne7 9. d4 exd4 10. cxd4 Bd7
1948 JUG Ch – Round 6 – Udovcic, Mijo – 1/2-1/2 – Fuderer, Andrija – G25 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O d6 6. d3 Bg4 7. Bg5 a6 8. Bxf6 gxf6 9. Bxc6+ bxc6 10. h3 Bh5
1949 URS Ch, semi final – Round 3 – Petrosian, Tigran A. – 1-0 – Novotelnov, Nikolai – G42 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O Bxc3 6. bxc3 O-O 7. Re1 d6 8. d4 Qe7 9. h3 a6 10. Bf1 Nd7
1963 Odense – Round 3 – Hamann, Svend – 1/2-1/2 – Brinck-Claussen, Bjorn – G20 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O Nd4 6. Ba4 Nxf3+ 7. Qxf3 O-O 8. d3 c6 9. Bb3 Be7 10. h3 d6
1968 Lugano SUI – Round 1 – Bedros, Jacques – 0-1 – Pfleger, Helmut, Dr. – G54 1. e4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. Bb5 Bb4 5. O-O d6 6. Nd5 Nxd5 7. exd5 a6 8. Ba4 b5 9. dxc6 bxa4 10. c3 Ba5
FIDE World Blitz Championship 2025 – Round 10 – Andrey Esipenko – 0-1 – Aram Hakobyan – G198 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Nxc6 bxc6 7. e5 Nd5 8. Ne4 Bb7 9. Bd3 Qc7 10. f4 c5