C55t — Two Knights: 5.O-O d6

1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.O-O d6 * ○ Trait aux Blancs

Ouverture — Centre mobile

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

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Plans. Nxd4 (Cavalier centralisé en d4 — 79 % des parties) ; Ng5 (8 % des parties) ; c3 (Renforcer le centre — 6 % des parties).

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

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Plans. ...Be7 (Développer f8 — 48 % des parties) ; ...Ne5 (Cavalier centralisé en e5 — 20 % des parties) ; ...Bd7 (Fou actif (mobilité 5), Développer c8 — 6 % des parties).

Avantages

Faiblesses

Diagonale active

Plans

Structure de pions

	♔ Blancs	♚ Noirs
Pions doublés	—	● d4, ● d6
Pions isolés	—	—
Arriérés	—	—
Chaînes	—	● c7→d6
Passés	—	—
Majorité	—	—

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● d5 (2v1), ● g5 (2v0)	● g4 (2v0), ● e5 (2v1)
Cases faibles	—	—
Centre	● d4 (2v1), ● d5 (2v1)	● e4 (1v0), ● e5 (2v1)

Colonnes et diagonales

	♔ Blancs	♚ Noirs
Semi-ouvertes	● d	● e

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 5)
Bc4	● Bc4 Actif (mob. 8)
Bc8		● Bc8 Non développé (mob. 5)
Bf8		● Bf8 Non développé (mob. 1)
Paire de fous	● Oui	● Oui
Non développées	3 (● b1, ● c1, ● a1)	4 (● c8, ● f8, ● 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, ● e4-e5	● …d4-d3, ● …d6-d5

Partie
1900 Paris – Round 6 – Rosen Vivek Murugesan – 0-1 – Janowski, Dawid – G50 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O d6 6. Nxd4 Be7 7. Nc3 O-O 8. Nxc6 bxc6 9. b3 Be6 10. Ba6 Rb8
1900 Paris – Round 8 – Mortimer, James – 1-0 – Rosen Vivek Murugesan – G59 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O d6 6. Ng5 Ne5 7. Qxd4 h6 8. Nf3 Nxf3+ 9. gxf3 Bh3 10. Re1 Nd7
1905 It (Men) Stockholm SWE – Round 5 – Spielmann, Rudolf – 1-0 – Schelfhout, Willem – G17 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O d6 6. Nxd4 Be7 7. Nc3 O-O 8. h3 Nxd4 9. Qxd4 Be6 10. Bxe6 fxe6
1907 Ostende II – Round 16 – Mortimer, James – 0-1 – Teichmann, Richard – G195 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O d6 6. Nxd4 Be7 7. Nc3 O-O 8. h3 a6 9. a3 Re8 10. Nxc6 bxc6
1912 DSB-18.Kongress – Round 16 – Levitsky, Stepan – 1/2-1/2 – Schlechter, Carl – G127 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O d6 6. Nxd4 Be7 7. Nc3 O-O 8. Nde2 Ne5 9. Bb3 c6 10. a4 Qc7
1923 Trieste – Round 1 – Cancelliere, Michel – 1-0 – Asztalos, Lajos – G14 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O d6 6. Nxd4 Be7 7. Nc3 O-O 8. b3 Ne5 9. Bd3 Re8 10. Bb2 c6
1923 Trieste – Round 9 – Cancelliere, Giuseppe – 1-0 – Asztalos, Lajos – G44 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O d6 6. Nxd4 Be7 7. Nc3 O-O 8. b3 Ne5 9. Bd3 Re8 10. Bb2 c6
1951 San Rafael – Round ? – Estrada Degrandi, Walter – 1/2-1/2 – Roux Cabral, Luis – G46 1. e4 e5 2. Bc4 Nf6 3. Nf3 Nc6 4. d4 exd4 5. O-O d6 6. Nxd4 Nxd4 7. Qxd4 Be7 8. Nc3 O-O 9. Kh1 Ng4 10. Nd5 Bf6
1956 ITA-ch18 Rovigo – Round 8 – Palmiotto, Fiorentino – 0-1 – Siveri, Armando – G28 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Nf6 5. O-O d6 6. Nxd4 Nxd4 7. Qxd4 Be7 8. Nc3 O-O 9. f4 c6 10. Kh1 Ne8
1959 Zalaegerszeg – Round 1 – Portisch, Ferenc – 1-0 – Csutora, L. – G7 1. e4 e5 2. d4 exd4 3. Nf3 Nc6 4. Bc4 Nf6 5. O-O d6 6. Nxd4 Nxd4 7. Qxd4 Be7 8. Nc3 O-O 9. Kh1 b6 10. Bg5 Ng4
1962 Marianske Lazne – Round 4.1 – Radulov, Dmitrii – 0-1 – Hort, Vlastimil – G30 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Nf6 5. O-O d6 6. Nxd4 Be7 7. Nxc6 bxc6 8. Nc3 O-O 9. Bg5 Rb8 10. b3 Ng4
1964 Tel Aviv olm prel – Round 6 – Rodriguez Gonzales, Jesus – 1/2-1/2 – Radovici, Corvin – G240 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Nf6 5. O-O d6 6. Nxd4 Be7 7. Nc3 O-O 8. Nd5 Nxd4 9. Qxd4 Nxd5 10. Bxd5 Bf6
1965 Sinaia stud ol prel – Round 2 – Radulov, Ivan – 0-1 – Ree, Hans – G11 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Nf6 5. O-O d6 6. Nxd4 Be7 7. Nc3 O-O 8. Nxc6 bxc6 9. Bf4 Nd7 10. Qe2 Bf6
1969 Hastings6970 – Round 5 – Corden, Martyn J – 1-0 – Smyslov, Vladimir – G24 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Nf6 5. O-O d6 6. Nxd4 Be7 7. Nc3 O-O 8. b3 Re8 9. Bb2 Bf8 10. Re1 Bd7

C55t — Two Knights (1900)

1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.O-O d6

Les coups candidats

6.Nxd4 — 78.7% (838 parties)

Ambassadeurs : Kordinova, Monika (6x), Stephenson, Geoffrey (3x), Snape, Ian L (3x), Radulov, Ivan (2x), Tan, Lian Ann (2x), Knezevic, Milorad (2x), Cafferty, Bernard (2x), Fette, Martin (2x)

6.Ng5 — 8.1% (86 parties)

Ambassadeurs : Quesada, Jose Miguel (2x), Pias, L (1x), Torre, Eugenio (1x), Juslin, Petri (1x), Borenius, Mika (1x), Moody, David W (1x), Sullivan, Richard (1x), Croisier, Alexis (1x)

6.c3 — 5.7% (61 parties)

Ambassadeurs : Wesely, Heinz (1x), Pogorelov, Aleksandr Anat (1x), Raddatz, Michael (1x), Rulik, O. (1x), Dobson Aguilar, Luis F. (1x), Romano, Nicolas (1x), Kromer, Thomas (1x), Jehle, Bernhard (1x)

6.Re1 — 4.2% (45 parties)

Ambassadeurs : Fanjul, San Miguel Jose (1x), Gonzalez, Mir Braulio (1x), Sloan, Sam (1x), Weidenmeyer (1x), Graebe, Kerstin (1x), Umpfenbach, Carolin (1x), Pruell, Clemens (1x), Ley, Peter (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	6.Nxd4	6.Ng5	6.c3	6.Re1
<1800	155	66%	10%	11%	8%
1800-2200	486	82%	8%	5%	3%
2200-2600	143	96%	—	1%	1%
2600+	2	100%	—	—	—

Évolution par décennie (% des parties)

Décennie	N parties	6.Nxd4	6.Ng5	6.c3	6.Re1
1950s	5	80%	20%	—	—
1960s	17	88%	—	—	12%
1970s	24	83%	12%	—	—
1980s	48	81%	6%	6%	—
1990s	241	72%	12%	7%	5%
2000s	332	77%	7%	7%	5%
2010s	301	85%	7%	4%	4%
2020s	97	77%	6%	6%	5%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
6.Nxd4	85%	77%	▼ -7.4%
6.Ng5	7%	6%	-0.5%
6.c3	4%	6%	▲ +2.2%
6.Re1	4%	5%	▲ +1.5%

Parties historiques

6.Nxd4 — 78.7% (838 parties)

1951 — Estrada, Walter vs Roux Cabral, Luis — 1/2-1/2 — San Rafael
1956 — Palmiotto, Fiorentino vs Siveri, Armando — 0-1 — ITA-ch18 Rovigo
1957 — Eidelman, Mauricio vs Ducas, J. — 0-1 — Sao Paulo BRA
1959 — Portisch, Ferenc vs Csutora, L. — 1-0 — Zalaegerszeg
1962 — Perman, Torvald vs Nilsson, Nils S — 1-0 — Marianske Lazne

6.Ng5 — 8.1% (86 parties)

1950 — Pias, L vs Torre, Eugenio — 1-0 — Estoril
1973 — Kwan, Ka Kin vs Garcia, Gildardo — 1/2-1/2 — Teesside ENG
1974 — Croisier, Alexis vs Berry, Jonathan — 0-1 — Seattle, WA USA
1974 — Pulver, Nathan vs Lasser, Alan — 1-0 — New York, NY USA
1980 — Moody, David W vs Sullivan, Richard — 1-0 — Dearborn, Mich.

6.c3 — 5.7% (61 parties)

1984 — Wesely, Heinz vs Pogorelov, Aleksandr Anat — 1/2-1/2 — corr EU/M/GT
1986 — Dobson Aguilar, Luis F. vs Romano, Nicolas — 1-0 — Ciudad de Ushuaia
1989 — Raddatz, Michael vs Rulik, O. — 0-1 — Bargteheide
1990 — Burke, Paul vs Jan Kruger — 1-0 — Burnaby CAN
1991 — Kromer, Thomas vs Jehle, Bernhard — 1/2-1/2 — Jedesheim

6.Re1 — 4.2% (45 parties)

1962 — Sloan, Sam vs Weidenmeyer — 1-0 — Los Angeles, CA USA
1967 — Fanjul, San Miguel Jose vs Gonzalez, Mir Braulio — 1-0 — ?
1991 — Maison, B. vs Dumont, Andre — 1/2-1/2 — Huy
1992 — Lopez Ramos, Alberto vs Cue, R. — 0-1 — Candas open
1992 — Saccona, Silvano vs Alonso Fernandez, Marcos — 1/2-1/2 — Asturias ESP

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