C55s — Two Knights: 5.O-O Be7

1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.O-O Be7 * ○ Trait aux Blancs

Ouverture — Centre mobile

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

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Plans. e5 (Occuper le centre — 51 % des parties) ; Re1 (26 % des parties) ; Nxd4 (Cavalier centralisé en d4 — 21 % des parties).

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

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Plans. ...Ne4 (Cavalier centralisé en e4 — 37 % des parties) ; ...d6 (Libérer Bc8 — 22 % des parties) ; ...O-O (Mettre le roi en sécurité, connecter les tours — 13 % des parties) ; ...Ng4 (13 % des parties).

Avantages

Faiblesses

Diagonale active

Plans

Structure de pions

	♔ Blancs	♚ Noirs
Pions doublés	—	● d4, ● d7
Pions isolés	—	—
Arriérés	—	—
Chaînes	—	—
Passés	—	—
Majorité	—	—

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● d5 (2v1), ● g5 (2v0)	● b4 (2v0)
Cases faibles	—	—
Centre	● d4 (2v1), ● d5 (2v1)	● e4 (1v0)

Colonnes et diagonales

	♔ Blancs	♚ Noirs
Semi-ouvertes	● d	● e

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 5)
Bc4	● Bc4 Actif (mob. 8)
Be7		● Be7 Actif (mob. 5)
Bc8		● Bc8 Non développé (mob. 0)
Paire de fous	● Oui	● Oui
Non développées	3 (● b1, ● 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	mobile
Ruptures	● c2-c3	● …d4-d3, ● …d7-d5

Partie
1901 2. Torneo USI – Round ? – Rosselli del Turco, Stefano – 1/2-1/2 – Ascoli, Felice – G6 1. e4 e5 2. Bc4 Nf6 3. Nf3 Nc6 4. d4 exd4 5. O-O Be7 6. e5 Ng4 7. Re1 d5 8. Bb5 Bb4 9. Bd2 Bxd2 10. Nbxd2 Bd7
1907 Ostende II – Round 12 – Mortimer, James – 1/2-1/2 – Van Vliet, Lodewijk – G148 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O Be7 6. e5 Ne4 7. c3 d5 8. Bb5 dxc3 9. Nxc3 Nxc3 10. bxc3 O-O
1907 Vienna – Round 6 – Prokes, Ladislav – 0-1 – Loewy, Leopold Jr – G24 1. e4 e5 2. Bc4 Nf6 3. d4 exd4 4. Nf3 Nc6 5. O-O Be7 6. Nxd4 Nxd4 7. Qxd4 O-O 8. e5 d5 9. exf6 dxc4 10. Qxd8 Bxd8
1914 Baden-Baden – Round 1 – Fahrni, Hans – 1/2-1/2 – Schlechter, Carl – G44 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Nf6 5. O-O Be7 6. e5 Ne4 7. Bd5 Nc5 8. Nxd4 Nxd4 9. Qxd4 O-O 10. Be3 d6
1923 Amsterdam m1 – Round ? – Euwe, Max – 0-1 – Kroone, Gerard – G9 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O Be7 6. Nxd4 O-O 7. Nc3 d6 8. b3 Ne5 9. Be2 c5 10. Nf3 Bd7
1937 Rogaska Slatina – Round 14 – Kostic, Boris – 1-0 – Gereben, Erno – G20 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Nf6 5. O-O Be7 6. Nxd4 d6 7. Nc3 O-O 8. h3 Re8 9. Re1 Ne5 10. Bf1 Ng6
1945 Hastings4546 – Round 5 – Steiner, Heinrich Jun. – 1/2-1/2 – Prins, Laura – G26 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O Be7 6. Nxd4 O-O 7. Nc3 d6 8. h3 Nxd4 9. Qxd4 c6 10. Be3 b5
1951 Marines Mem.Club,10 secm – Round ? – Koltanowski, George – 1-0 – Lutz, Godfrey – G26 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. O-O Be7 5. d4 exd4 6. e5 Ne4 7. Re1 d5 8. Bb5 O-O 9. Bxc6 bxc6 10. Nxd4 f6
1951 Toronto Ch finals – Round 8 – Anderson, Frank Ross – 1-0 – Rose, Edward – G13 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O Be7 6. Nxd4 O-O 7. Nxc6 bxc6 8. e5 Ne4 9. Qe2 d5 10. Bd3 Nc5
1952 Havana – Round 11 – Aguero Quesada, Gloriana – 0-1 – Lasker, Edward – G99 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O Be7 6. Re1 d6 7. Nxd4 O-O 8. Nc3 Ne5 9. Be2 Re8 10. b3 d5
1956 Zittau-A 6th – Round 6 – Zinn, Lothar – 1/2-1/2 – Blatny, Frantisek – G24 1. e4 e5 2. Bc4 Nf6 3. Nf3 Nc6 4. O-O Be7 5. d4 exd4 6. Re1 d6 7. Nxd4 Nxd4 8. Qxd4 O-O 9. Nc3 Ng4 10. Nd5 Bh4
1959 Wch U20 prel-C – Round 9 – Hoen, Ragnar Harald – 0-1 – Tcherniak, Gilles – G21 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Be7 5. O-O Nf6 6. e5 Ng4 7. Bf4 d6 8. exd6 cxd6 9. Nxd4 O-O 10. c3 Nge5
1960 CSR Ch – Round 11 – Kupka, Slavoj – 1-0 – Florian, Jaromir – G97 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O Be7 6. e5 Ng4 7. Bf4 d6 8. exd6 Bxd6 9. Re1+ Kf8 10. Bxd6+ Qxd6
1960 S.F. Fairmont Hotel, bl – Round 21 – Koltanowski, George – 1-0 – Johnson, Robert K. – G8 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. O-O Be7 5. d4 exd4 6. e5 Ng4 7. Re1 O-O 8. h3 Nh6 9. Bxh6 d6 10. Bf4 Bf5
1960 San Francisco – Round 1 – Koltanowski, George – 1-0 – Hansen Milton – G9 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. O-O Be7 5. d4 exd4 6. e5 Ne4 7. Re1 Nc5 8. Nxd4 Ne6 9. Nf5 O-O 10. Nc3 d6
1968 Bristol ch-BCF – Round 7 – Cafferty, Bernard – 1/2-1/2 – Knox, Victor W – G80 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O Be7 6. Re1 d6 7. Nxd4 O-O 8. Nc3 Nxd4 9. Qxd4 c6 10. h3 b5

C55s — Two Knights (1901)

1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.O-O Be7

Les coups candidats

6.e5 — 51.2% (448 parties)

Ambassadeurs : Koltanowski, George (6x), Basanta, Gary (2x), Gorbov, Igor (2x), Andrade, Jose M Vieira (2x), ? (2x), d'Aragona Vittoria (2x), Hater, David (2x), Gomez, Pedro (1x)

6.Re1 — 25.8% (226 parties)

Ambassadeurs : Aristotelous, Vassilis (2x), Zinn, Lothar (1x), Blatny, Frantisek (1x), Quesada, Americo (1x), Lasker, Edward (1x), Conings, Jos (1x), De Bruycker, Bernard (1x), Petersen, CO. (1x)

6.Nxd4 — 21.3% (186 parties)

Ambassadeurs : Rupeni, Franco (2x), Jirka, Jiri (2x), Tylecek, Drahomir (2x), Anderson, Frank Ross (1x), Aguero Mercedes, Rose Esmeralda (1x), Kapengut, Albert (1x), Vistanetzkis (1x), Pitters, Peter Cornelis (1x)

6.c3 — 1.0% (9 parties)

Ambassadeurs : Bohm, Tomas (1x), Fojta, Jan (1x), Voelschow, Siegfried (1x), Gebert-Vangeel, Ralf (1x), Melounova, Ivana (1x), Zelena, Monika (1x), Bohm, Jan (1x), Krska, Vojtech (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	6.e5	6.Re1	6.Nxd4	6.c3
<1800	161	52%	22%	22%	2%
1800-2200	386	55%	25%	19%	1%
2200-2600	88	43%	30%	26%	—

Évolution par décennie (% des parties)

Décennie	N parties	6.e5	6.Re1	6.Nxd4	6.c3
1950s	11	64%	27%	9%	—
1960s	20	45%	30%	25%	—
1970s	13	54%	23%	23%	—
1980s	60	42%	33%	25%	—
1990s	187	45%	32%	22%	1%
2000s	270	48%	27%	22%	2%
2010s	258	58%	20%	20%	1%
2020s	56	62%	14%	20%	—

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
6.e5	58%	62%	▲ +4.4%
6.Re1	20%	14%	▼ -5.9%
6.Nxd4	20%	20%	-0.1%
6.c3	1%	0%	▼ -1.2%

Parties historiques

6.e5 — 51.2% (448 parties)

1951 — Koltanowski, George vs Deuter, Lutz — 1-0 — San Francisco, CA USA
1953 — Jacobs, Robert Merton vs Levin, Eugene — 0-1 — San Jose, CA USA
1953 — Koltanowski, George vs ? — 1-0 — Antwerp simul
1953 — Koltanowski, George vs Ajuna Thompson — 1-0 — Vancouver
1955 — Koltanowski, George vs Nolte, John — 1-0 — San Quentin, CA

6.Re1 — 25.8% (226 parties)

1952 — Quesada, Americo vs Lasker, Edward — 0-1 — Havana CUB
1954 — Petersen, CO. vs Hansen, Poul Martin — 0-1 — Copenhagen DEN
1956 — Zinn, Lothar vs Blatny, Frantisek — 1/2-1/2 — Zittau
1963 — Conings, Jos vs De Bruycker, Bernard — 1/2-1/2 — Belgium
1965 — Ali Gatee vs Peli, Giora Dr — 1-0 — Israel

6.Nxd4 — 21.3% (186 parties)

1951 — Anderson, Frank Ross vs Aguero Mercedes, Rose Esmeralda — 1-0 — Toronto CAN
1960 — Koltanowski, George vs O Neill Michael — 1/2-1/2 — San Francisco, CA USA
1963 — Kapengut, Albert vs Vistanetzkis — 1-0 — ?
1964 — Pitters, Peter Cornelis vs Christ, Anton — 1/2-1/2 — ?
1964 — Ibadlaev, Denis vs Zhukov, Vadim — 1-0 — URS

6.c3 — 1.0% (9 parties)

1999 — Bohm, Tomas vs Fojta, Jan — 1-0 — Most
2000 — Voelschow, Siegfried vs Gebert-Vangeel, Ralf — 1-0 — Mecklenburg VP
2000 — Bohm, Jan vs Krska, Vojtech — 1/2-1/2 — Frymburk
2002 — Melounova, Ivana vs Zelena, Monika — 0-1 — Frymburk
2008 — Adler, Haymo vs Gruber, Albert — 1/2-1/2 — GER

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