B23n — Sicilian: Chameleon, 3…e5

1.e4 c5 2.Nc3 Nc6 3.Nge2 e5 ○ Trait aux Blancs

Ouverture — Centre fermé

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Plans. Nd5 (Cavalier centralisé en d5 — 68 % des parties) ; g3 (Préparer le fianchetto — 15 % des parties) ; Ng3 (11 % des parties).

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Plans. ...d6 (Libérer Bc8 — 33 % des parties) ; ...g6 (Préparer le fianchetto — 19 % des parties) ; ...Nf6 (Développer g8 — 19 % des parties) ; ...Nge7 (Développer g8 — 17 % des parties) ; ...Nce7 (8 % des parties).

Avantages

Faiblesses

Diagonale active

Plans

Structure de pions

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

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● d5 (2v0)	● b4 (2v0), ● d4 (3v1)
Cases faibles	—	—
Centre	● d5 (2v0), ● e4 (1v0)	● d4 (3v1), ● e5 (1v0)

Colonnes et diagonales

♔ Blancs

♚ Noirs

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 0)
Bf1	● Bf1 Non développé (mob. 0)
Bc8		● Bc8 Non développé (mob. 0)
Bf8		● Bf8 Non développé (mob. 2)
Paire de fous	● Oui	● Oui
Non développées	4 (● c1, ● f1, ● 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, ● f2-f4	● …d7-d5, ● …f7-f5

Partie
1928 Bad Kissingen – Round 2 – Mieses, Jacques – 1/2-1/2 – Bogoljubow, Efim – G16 1. e4 c5 2. Nc3 Nc6 3. Nge2 e5 4. Nd5 d6 5. d3 Nge7 6. Nec3 Nxd5 7. Nxd5 Be7 8. g3 O-O 9. Bg2 Be6 10. O-O Qd7
1960 Sao Paulo zt – Round 11 – Recalde, Eleuterio – 0-1 – Wexler, Bernardo – G56 1. e4 c5 2. Ne2 e5 3. Nbc3 Nc6 4. d3 d6 5. Nd5 Nge7 6. Nec3 Be6 7. g3 Qd7 8. Bg2 Nd4 9. Be3 O-O-O 10. Nxe7+ Bxe7
1962 CSR Ch – Round 15 – Hort, Vlastimil – 1/2-1/2 – Vesely, Jiri – G129 1. e4 c5 2. Nc3 Nc6 3. Nge2 e5 4. Nd5 Nge7 5. Nec3 d6 6. Bc4 Nxd5 7. Nxd5 Be6 8. d3 Be7 9. O-O O-O 10. Qh5 a6
1962 Sarajevo – Round 3 – Kozomara, Vlado – 1/2-1/2 – Bobotsov, Milko G – G24 1. e4 c5 2. Ne2 e5 3. Nbc3 Nc6 4. g3 g6 5. Bg2 Bg7 6. Nd5 Nge7 7. Nec3 Nxd5 8. Nxd5 Ne7 9. Nxe7 Qxe7 10. d3 d6
1962 Whitby ch-BCF – Round 2 – Gibbs, Peter Campbell – 1-0 – Parr, Frank – G36 1. e4 c5 2. Nc3 Nc6 3. Nge2 e5 4. Nd5 g6 5. Nec3 Bg7 6. Nb5 Kf8 7. Nd6 Nd4 8. c3 Ne6 9. Qf3 Bf6 10. Bc4 Kg7
1963 Europe Team Ch qual – Round 1.13 – Kinzel, Anton – 1-0 – Wolk, Sigmund – G4 1. e4 c5 2. Nc3 Nc6 3. Nge2 e5 4. g3 f5 5. d3 Nf6 6. Bg2 d6 7. Bg5 h6 8. Be3 Be6 9. O-O g5 10. exf5 Bxf5
1965 Pardubice – Round 8 – Blatny, Frantisek – 0-1 – Alster, Ladislav – G59 1. e4 c5 2. Nc3 Nc6 3. Nge2 e5 4. Nd5 Nge7 5. Nec3 Nxd5 6. Nxd5 d6 7. Bb5 Be7 8. b4 cxb4 9. Nxb4 Bd7 10. Nd5 O-O
1965 WchT U26 12. fin-A – Round 7 – Jansa, Vlastimil – 1-0 – Partos, Charles – G44 1. e4 c5 2. Nc3 Nc6 3. Nge2 e5 4. Nd5 d6 5. Nec3 Nd4 6. Bc4 Ne7 7. O-O Rb8 8. a4 a6 9. f4 Nec6 10. f5 b5
1969 Moskou ch-URS – Round 1 – Balashov, Yuri S – 1/2-1/2 – Zhukhovitsky, Samuel – G92 1. e4 c5 2. Nc3 Nc6 3. Nge2 e5 4. Nd5 d6 5. Nec3 Be6 6. Bc4 g6 7. d3 Bg7 8. O-O Nge7 9. f4 exf4 10. Bxf4 O-O
1969 POL Ch 26th – Round 3 – Sydor, Andrzej – 1-0 – Szukszta, Janus – G9 1. e4 c5 2. Nc3 Nc6 3. Nge2 e5 4. Ng3 Nf6 5. Bc4 Na5 6. d3 a6 7. a4 d6 8. O-O Be7 9. Ba2 Be6 10. f4 O-O
FIDE WCh KO 2000 – Round 2.4 – Short, Nigel D – 1/2-1/2 – Nataf, Igor-Alexandre – G82 1. e4 c5 2. Nc3 Nc6 3. Nge2 e5 4. Nd5 Nf6 5. Nec3 Nxd5 6. Nxd5 Be7 7. Bc4 O-O 8. O-O d6 9. a4 Be6 10. d3 Rb8
Linares 1992 – Round 4 – Short, Nigel D – 1-0 – Ljubojevic, Ljubomir – G17 1. e4 c5 2. Nc3 Nc6 3. Nge2 e5 4. Nd5 a6 5. a4 Nf6 6. Nec3 Nb4 7. Bc4 Nbxd5 8. Nxd5 d6 9. d3 Nxd5 10. Bxd5 Qe7
World Blitz 2019 – Round 2.52 – Vallejo Pons, Francisco – 1-0 – Potapov, Pavel – G125 1. e4 c5 2. Ne2 Nc6 3. Nbc3 e5 4. Nd5 Nce7 5. Ne3 d5 6. exd5 Nxd5 7. Nxd5 Qxd5 8. Nc3 Qd8 9. Bb5+ Bd7 10. Qe2 Bd6
World Blitz 2021 – Round 18.10 – Sindarov, Javokhir – 1-0 – Maghsoodloo, Parham – G1035 1. e4 c5 2. Nc3 Nc6 3. Nge2 e5 4. Nd5 Be7 5. Nec3 Nf6 6. Bc4 d6 7. d3 O-O 8. O-O Nxd5 9. Nxd5 Bg5 10. f4 exf4
World Rapid 2021 – Round 3.19 – Shirov, Alexei – 1-0 – Corrales Jimenez, Fidel – G144 1. e4 c5 2. Nc3 Nc6 3. Nge2 e5 4. Ng3 g6 5. Bc4 Bg7 6. d3 Nge7 7. f4 exf4 8. Bxf4 d6 9. Qd2 Be6 10. Bh6 Bxh6

B23n — Chameleon (1928)

1.e4 c5 2.Nc3 Nc6 3.Nge2 e5

Les coups candidats

4.Nd5 — 68.4% (609 parties)

Ambassadeurs : Tischbierek, Raj (7x), Perpinya Rofes, Lluis Maria (5x), Inkiov, Ventzislav (4x), Vogt, Lothar (4x), Ghinda, Mihail-Viorel (4x), Jansa, Vlastimil (4x), ? (4x), Zhelnin, Vladimir V (4x)

4.g3 — 15.0% (134 parties)

Ambassadeurs : Pizzato, Charles (2x), Shianovsky, Vladislav I (1x), Beliavsky, Alexander G (1x), Blackstone, John (1x), Shean, B. (1x), Kinzel, Anton (1x), Wolk, Sigmund (1x), Kozomara, Vlado (1x)

4.Ng3 — 10.9% (97 parties)

Ambassadeurs : Maisuradze, Nata (4x), Kontic, Djordjije (3x), Votava, Jan (2x), Manolov, Ivan (2x), Horvath, Peter (2x), Sydor, Andrzej (1x), Szukszta, Janus (1x), Yurkov, Aleksey (1x)

4.d3 — 4.7% (42 parties)

Ambassadeurs : Rosenhahn, Eberhard (2x), Bastrikov, Georgy (1x), Furman, Semyon (1x), Averbakh, Yuri L (1x), Taimanov, Mark (1x), Recalde, Eleuterio (1x), Wexler, Bernardo (1x), Piket, Joop (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	4.Nd5	4.g3	4.Ng3	4.d3
<1800	26	38%	23%	19%	19%
1800-2200	287	62%	20%	8%	8%
2200-2600	486	74%	12%	13%	1%
2600+	12	58%	17%	25%	—

Évolution par décennie (% des parties)

Décennie	N parties	4.Nd5	4.g3	4.Ng3	4.d3
1950s	3	—	—	33%	67%
1960s	16	56%	25%	6%	12%
1970s	13	54%	15%	31%	—
1980s	47	79%	15%	—	6%
1990s	229	79%	11%	5%	3%
2000s	235	73%	17%	3%	4%
2010s	228	69%	16%	9%	5%
2020s	120	38%	16%	42%	4%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
4.Nd5	69%	38%	▼ -31.0%
4.g3	16%	16%	+0.0%
4.Ng3	9%	42%	▲ +32.5%
4.d3	5%	4%	▼ -1.1%

Joueurs célèbres

Champions du monde dans cette position

Anand, Viswanathan — 2 parties
Carlsen, Magnus — 1 partie
Hou, Yifan — 1 partie

Parties historiques

4.Nd5 — 68.4% (609 parties)

1962 — Hort, Vlastimil vs Vesely, Jiri — 1/2-1/2 — Jablonec
1962 — Hort, Vlastimil vs Spassky, Boris V. — 1/2-1/2 — Marianske Lazne
1962 — Gibbs, Peter Campbell vs Parr, Frank — 1-0 — Whitby ch-BCF
1965 — Jansa, Vlastimil vs Partos, Charles — 1-0 — Sinaia
1965 — Blatny, Frantisek vs Alster, Ladislav — 0-1 — Pardubice CZE

4.g3 — 15.0% (134 parties)

1962 — Kozomara, Vlado vs Bobotsov, Milko G — 1/2-1/2 — Sarajevo BIH
1963 — Kinzel, Anton vs Wolk, Sigmund — 1-0 — Bad Pyrmont GER
1968 — Blackstone, John vs Shean, B. — 1-0 — Sunnyvale, CA
1969 — Shianovsky, Vladislav I vs Beliavsky, Alexander G — 1/2-1/2 — ?
1974 — Garcia Palermo, Carlos Horacio vs Poch, Cesar G. — 1-0 — Caseros ch-ARG

4.Ng3 — 10.9% (97 parties)

1959 — Yurkov, Aleksey vs Salov, Aleksei — 1-0 — USSR
1969 — Sydor, Andrzej vs Szukszta, Janus — 1-0 — Lublin POL
1971 — Oetzel, Roland vs Marcinkowski, Kazimierz — 1/2-1/2 — Leipzig GER
1973 — Lehmann, Christina vs Burchardt, Brigitte — 0-1 — Erfurt GER
1975 — Barnes, Craig vs Rossetto, Hector — 1-0 — Lone Pine open

4.d3 — 4.7% (42 parties)

1958 — Bastrikov, Georgy vs Furman, Semyon — 0-1 — Sochi RUS
1958 — Averbakh, Yuri L vs Taimanov, Mark — 1-0 — Moscow RUS
1960 — Recalde, Eleuterio vs Wexler, Bernardo — 0-1 — Sao Paulo BRA
1969 — Piket, Joop vs De Ruiter, Tom — 1/2-1/2 — Leeuwarden ch-NED
1988 — Rosenhahn, Eberhard vs Riemer, Wolfgang — 1/2-1/2 — corr WT/M/GT

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