B27s — Sicilian: Accelerated Pterodactyl, 4.c4

1.e4 c5 2.Nf3 g6 3.d4 Bg7 4.c4 * ● Trait aux Noirs

Ouverture — Centre semi-ouvert

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Avantages : case forte d5, case forte e5, case forte g5, paire de fous.
Faiblesses adverses : Bc8 enfermé, roi noir au centre, pawn c5 en prise.
Problèmes : roi au centre, Bc1 enfermé, Bf1 enfermé, 5 pièces non développées (B1, C1, F1, A1, H1).
Plans :
● O-O — Mettre le roi en sécurité, connecter les tours
● Nc3 — Développer Nb1
● Be3 — Développer Bc1
● Bd3 — Développer Bf1
● h3 — Empêcher ...Bg4

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Avantages : Bg7 actif, paire de fous.
Faiblesses adverses : Bc1 enfermé, Bf1 enfermé, roi blanc au centre.
Problèmes : roi au centre, Bc8 enfermé, 5 pièces non développées (B8, G8, C8, A8, H8).
Plans :
● O-O — Mettre le roi en sécurité, connecter les tours
● ...d6 — Libérer Bc8
● ...Nc6 — Développer Nb8
● ...Nf6 — Développer Ng8
● ...Bg4 — Clouer Nf3

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

B27s — Accelerated Pterodactyl

1.e4 c5 2.Nf3 g6 3.d4 Bg7 4.c4

Eval: [+0.55]

Les coups candidats

4…cxd4 — 56.8% (3192 parties)

Ambassadeurs : Hoffman, Alejandro (15x), Suba, Mihai (12x), Cvetkovic, Srdjan (11x), Habibi, Ali (10x), Uhlmann, Wolfgang (9x), Adamski, Jan (9x), Bellon Lopez, Juan Manuel (8x), Velimirovic, Dragoljub (8x)

4…d6 — 13.7% (768 parties) →

Ambassadeurs : Forintos, Gyozo V (10x), Bilek, Istvan (10x), Szalanczi, Emil (9x), Topalov, Veselin (9x), Ribli, Zoltan (9x), Smejkal, Jan (8x), Velimirovic, Dragoljub (7x), Andersson, Ulf (7x)

4…Qa5+ — 12.3% (692 parties) →

Ambassadeurs : Sermek, Drazen (33x), Gheorghiu, Florin (19x), Vesselovsky, Serguei (10x), Nesterov, Yakov (7x), Chekhov, Valery A (7x), Khasin, Alexander (7x), Dizdar, Goran (7x), Adamski, Jan (7x)

4…Qb6 — 8.0% (448 parties)

Ambassadeurs : Wojtkiewicz, Aleksander (17x), Petrov, Marian (13x), Nevednichy, Vladislav (9x), Markowski, Tadeusz (8x), Markowski, Tomasz (7x), Loeffler, Stefan (7x), Hentunen, Asko (6x), Rajlich, Iweta (6x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	4…cxd4	4…d6	4…Qa5+	4…Qb6
<1800	104	79%	5%	2%	7%
1800-2200	1471	73%	7%	6%	5%
2200-2600	3362	49%	16%	16%	10%
2600+	96	32%	33%	14%	15%

Évolution par décennie (% des parties)

Décennie	N parties	4…cxd4	4…d6	4…Qa5+	4…Qb6
1900s	1	100%	—	—	—
1920s	1	100%	—	—	—
1930s	2	100%	—	—	—
1950s	19	53%	16%	—	—
1960s	67	43%	24%	3%	1%
1970s	350	40%	20%	19%	1%
1980s	315	46%	17%	17%	2%
1990s	849	53%	14%	19%	4%
2000s	1624	49%	15%	12%	16%
2010s	1905	68%	11%	8%	7%
2020s	491	70%	12%	10%	3%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
4…cxd4	68%	70%	▲ +2.1%
4…d6	11%	12%	▲ +1.1%
4…Qa5+	8%	10%	▲ +1.5%
4…Qb6	7%	3%	▼ -3.6%

Joueurs célèbres

Champions du monde dans cette position

Botvinnik, Mikhail — 4 parties
Smyslov, Vladimir — 4 parties
Kramnik, Vladimir — 4 parties
Kasparov, Garry — 2 parties
Tal, Mikhail — 2 parties
Karpov, Anatoly — 1 partie
Ju, Wenjun — 1 partie

Parties historiques

4…cxd4 — 56.8% (3192 parties)

1908 — Tartakower, Savielly vs Mieses, Jacques — 1/2-1/2 — Vienna AUT
1924 — Rosselli del Turco, Stefano vs Monticelli, Mario — 1/2-1/2 — Foligno ITA
1930 — Grau Palau Holt vs Romano Pedrozo — 1/2-1/2 — Circulo vs Sao Paulo
1934 — Bolbochan, J. vs Agama Hernandez, Juan Jesus — 1/2-1/2 — Mar del Plata ARG
1950 — Aitken, James vs Fazekas, Stephan — 0-1 — Ilford

4…d6 — 13.7% (768 parties)

1957 — Cortlever vs Barendregt, Jos — 1-0 — NLD-ch Amsterdam NED
1957 — Smyslov, Vasily vs Botvinnik, Mikhail — 1-0 — 12 Moscow Wch-m
1957 — Smyslov, Vladimir vs Botvinnik, Mikhail — 1-0 — Moskou wch-m
1960 — Endzelins, Lucius vs Ozols, Karlis — 1/2-1/2 — Adelaide AUS
1960 — Trifunovic, Petar vs Lokvenc, Josef — 1/2-1/2 — Marianske Lazne

4…Qa5+ — 12.3% (692 parties)

1965 — Harju, Antero vs Roenning, Svante — 0-1 — Finland ch corr
1966 — Gipslis, Aivars vs Stein, Leon Rico — 1/2-1/2 — Tbilisi ch-URS
1970 — Trikaliotis, Georgios vs Adamski, Jan — 0-1 — Siegen olm
1972 — Donchenko, Anatoly vs Khodos, German — 1-0 — Rostov on Don
1973 — Christiansen , Luis vs Beliavsky, Alexander G — 0-1 — Teesside ENG

4…Qb6 — 8.0% (448 parties)

1963 — Jester, Christian vs Rogosin, Hy — 1-0 — Westchester, CA
1971 — Loftsson, Julius H vs Noel Richard W — 1-0 — USA-72ch Ventura
1979 — Kogan, Izrail vs Kalinitschew, Sergey — 1/2-1/2 — Moscow RUS
1981 — Grooten, Herman vs Aleksic, Nenad — 0-1 — Caorle op Caorle ITA
1983 — Vukic, Milan vs Robatsch, Karl — 0-1 — Tuzla

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	—
Chaînes	—	● f7→g6, h7→g6
Passés	—	—
Majorité	—	—

Cases

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

Colonnes et diagonales

♔ Blancs

♚ Noirs

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 5)
Bf1	● Bf1 Non développé (mob. 2)
Bg7		● Bg7 Actif (mob. 5)
Bc8		● Bc8 Non développé (mob. 0)
Paire de fous	● Oui	● Oui
Non développées	5 (b1, c1, f1, a1, h1)	5 (b8, g8, c8, 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	semi-ouvert
Ruptures	● d4-d5, ● e4-e5	● …d7-d6, ● …d7-d5, ● …e7-e6, ● …e7-e5, ● …f7-f6, ● …f7-f5

Partie
1934 Mar del Plata – Round 13 – Bolbochan, J. – 1/2-1/2 – Agama Hernandez, Juan Jesus – G67 1. e4 c5 2. Nf3 g6 3. c4 Bg7 4. d4 cxd4 5. Nxd4 Qb6 6. Nb5 Nc6 7. Bd3 Nf6 8. O-O d6 9. Be3 Qd8 10. f3 O-O
1952 Miedzyzdroje – Round 14 – Koch, Berthold – 1/2-1/2 – Bakonyi, Elek – G89 1. e4 c5 2. Nf3 g6 3. c4 Bg7 4. d4 Nc6 5. d5 Nd4 6. Nc3 e5 7. dxe6 dxe6 8. Bf4 Ne7 9. Be2 Nec6 10. O-O O-O
1954 Hungary Ch – Round 1 – Pogats, Jozsef Jr. – 1/2-1/2 – Bilek, Istvan – G14 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. c4 Nc6 5. dxc5 Qa5+ 6. Bd2 Qxc5 7. Nc3 Nf6 8. Be2 O-O 9. O-O Ne5 10. b3 b6
1959 HUN Ch 15th – Round 11 – Pogats, Jozsef Jr. – 1-0 – Haag, Ervin – G37 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. c4 Nc6 5. dxc5 Qa5+ 6. Bd2 Qxc5 7. Nc3 Nf6 8. Be2 O-O 9. O-O Ne5 10. Rc1 d6
1959 Wch U20 fin-A – Round 10 – Clemens, Christian, Dr. – 0-1 – Tomson, Alexander – G35 1. e4 c5 2. Nf3 g6 3. c4 Bg7 4. d4 Nc6 5. d5 Nd4 6. Nc3 e5 7. Bd3 d6 8. Nxd4 cxd4 9. Ne2 Qb6 10. O-O Nf6
1960 AUS Ch – Round 7 – Endzelins, Lucius – 1/2-1/2 – Ozols, Karlis – G31 1. e4 g6 2. d4 Bg7 3. c4 c5 4. Nf3 d6 5. Be3 Bg4 6. Qd2 Bxf3 7. gxf3 Qb6 8. e5 dxe5 9. dxc5 Qc6 10. Nc3 Na6
1962 Capablanca Memorial – Round 21 – Pachman, Ludek – 1/2-1/2 – Smyslov, Vladimir – G216 1. e4 g6 2. d4 Bg7 3. c4 c5 4. Nf3 Nc6 5. d5 Nd4 6. Nxd4 cxd4 7. Bd3 d6 8. O-O Nf6 9. Nd2 O-O 10. Nf3 Qb6
1962 Hungary – Round 1 – Honfi, K. – 1/2-1/2 – Forintos, Gyozo V – G8 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. c4 Nc6 5. dxc5 Qa5+ 6. Bd2 Qxc5 7. Nc3 Nf6 8. Be2 O-O 9. O-O d6 10. a3 Ne5
1962 Sarajevo – Round 1 – Trifunovic, Petar – 1/2-1/2 – Bobotsov, Milko G – G12 1. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 Nc6 5. d5 Nd4 6. Nxd4 Bxd4 7. Bd3 d6 8. Nc3 Bg7 9. O-O Nf6 10. f4 O-O
1962 Torremolinos zt – Round 1 – Scafarelli, Francesco – 1/2-1/2 – Szabo, Ladislav – G44 1. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 Nc6 5. d5 Nd4 6. Nxd4 Bxd4 7. Nc3 d6 8. Bd3 Bg7 9. Be3 Nf6 10. h3 a6
1965 Hamburg etc – Round 1 – Trifunovic, Petar – 1/2-1/2 – Forintos, Gyozo V – G50 1. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 d6 5. Be2 Nc6 6. d5 Nd4 7. Nxd4 cxd4 8. Na3 Qa5+ 9. Bd2 Qb6 10. Bd3 Nf6
1965 Hamburg etc – Round 7 – Gunsberger, Alexander – 1/2-1/2 – Stein, Leon Rico – G82 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. c4 Nc6 5. d5 Nd4 6. Nxd4 cxd4 7. Bd3 d6 8. O-O Nf6 9. b3 e5 10. dxe6 Bxe6
1966 Stockholm jub 6667 – Round 9 – Litsberger, Rune – 0-1 – Skold, Kristian – G30 1. e4 c5 2. Nf3 g6 3. c4 Bg7 4. d4 d6 5. d5 Nh6 6. Nc3 O-O 7. Bf4 f6 8. Be2 Nd7 9. h3 Ne5 10. Qd2 Nxf3+
1967 Corr ch HUN – Round ? – Kovassy Szabolcs – 0-1 – Szabo, Laszlo – G9 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. c4 d6 5. Be3 Bg4 6. Nc3 Bxf3 7. gxf3 cxd4 8. Bxd4 Bxd4 9. Qxd4 Nf6 10. O-O-O Nc6
1967 Harrachov – Round ? – Opocensky, Karel – 1-0 – Kraus Cruz, Gabriel – G136 1. e4 c5 2. Nf3 g6 3. c4 Bg7 4. d4 Nc6 5. d5 Nd4 6. Nc3 e5 7. d6 Qb6 8. Nb5 Nxb5 9. cxb5 a6 10. a4 Qa7
1967 POL Ch 24th – Round 7 – Paczuski, Wladislaw – 1/2-1/2 – Filipowicz, Andrzej – G15 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. c4 Na6 5. d5 d6 6. Nc3 Nf6 7. Be2 O-O 8. O-O Nc7 9. h3 a6 10. a4 Rb8
1967 Reggio Emilia 6768 10th – Round 10 – Saidy, Anthony – 1-0 – Albano, Marco – G34 1. e4 c5 2. Nf3 g6 3. c4 Bg7 4. d4 Nc6 5. dxc5 Qa5+ 6. Bd2 Qxc5 7. Nc3 Qb6 8. Nd5 Qd8 9. Qc2 e6 10. Bc3 f6
1968 Monte Carlo – Round 11 – Zinser, Sylvain – 0-1 – Portisch, Lajos – G72 1. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 d6 5. dxc5 dxc5 6. Qxd8+ Kxd8 7. Nc3 Bxc3+ 8. bxc3 Nc6 9. Bf4 Ke8 10. Be2 b6
1969 Moscow – Round 1 – Lepeshkin, Vladimir – 1-0 – Murey, Jacob – G1 1. c4 c5 2. Nf3 g6 3. d4 Bg7 4. e4 Nc6 5. d5 Nd4 6. Nxd4 cxd4 7. Nd2 e5 8. b4 Nh6 9. c5 O-O 10. Bd3 f5
Alekhine Memorial 1971 – Round 1 – Stein, Leonid – 1-0 – Bronstein, David Ionovich – G1 1. c4 c5 2. Nf3 g6 3. d4 Bg7 4. e4 Nc6 5. d5 Nd4 6. Nxd4 Bxd4 7. Nc3 d6 8. Be2 Bg7 9. O-O Nf6 10. Bf4 O-O
Amber Blindfold 2001 – Round 8 – Karpov, Anatoly – 0-1 – Topalov, Veselin – G27 1. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 d6 5. Be2 Nc6 6. d5 Nd4 7. Nxd4 cxd4 8. O-O Qb6 9. Qb3 Nf6 10. Nd2 O-O
Amber Rapidplay 1999 – Round 1 – Kramnik, Vladimir – 1-0 – Topalov, Veselin – G6 1. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 Qb6 5. dxc5 Qxc5 6. Be2 d6 7. O-O Nc6 8. a3 Bg4 9. b4 Qb6 10. Be3 Qd8
Amber Rapidplay 2002 – Round 1 – Kramnik, Vladimir – 1/2-1/2 – Topalov, Veselin – G5 1. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 d6 5. d5 e6 6. h3 exd5 7. exd5 Nh6 8. Qe2+ Kf8 9. Bf4 f5 10. Ng5 Nf7
Amber-blindfold 06th 1997 – Round 7 – Lautier, Joel – 1/2-1/2 – Ivanchuk, Vasyl – G9 1. c4 g6 2. e4 c5 3. Nf3 Bg7 4. d4 Qb6 5. dxc5 Qxc5 6. Be2 d6 7. O-O Nc6 8. Qb3 Qb6 9. Nc3 Qxb3 10. axb3 Nf6
Amber-rapid 13th 2004 – Round 7 – Gelfand, Boris – 1-0 – Topalov, Veselin – G19 1. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 d6 5. d5 e6 6. h3 Ne7 7. Nc3 h6 8. Bd3 g5 9. O-O Bxc3 10. bxc3 e5
Dos Hermanas 1999 – Round 9 – Kramnik, Vladimir – 1/2-1/2 – Topalov, Veselin – G44 1. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 d6 5. Be2 Nc6 6. d5 Nd4 7. Nxd4 cxd4 8. O-O Qb6 9. Nd2 Nf6 10. Rb1 a5
FIDE Grand Swiss 2025 – Round 6 – Muradli Mahammad – 1/2-1/2 – Hammer Jon Ludvig – G346 1. Nf3 c5 2. c4 g6 3. e4 Bg7 4. d4 d6 5. d5 e6 6. h3 exd5 7. exd5 Nh6 8. Bg5 f6 9. Bd2 O-O 10. Be2 Nf7
GCT Blitz YourNextMove 2017 – Round 12.5 – Giri, Anish – 1/2-1/2 – Ivanchuk, Vasyl – G60 1. Nf3 c5 2. c4 g6 3. e4 Bg7 4. d4 Qb6 5. dxc5 Qxc5 6. Be2 d6 7. O-O Nc6 8. h3 Qb6 9. Qc2 Nd4 10. Nxd4 Bxd4
GMA 2004 – Round 13 – Timman, Jan H – 0-1 – Topalov, Veselin – G85 1. Nf3 c5 2. c4 g6 3. e4 Bg7 4. d4 d6 5. d5 e6 6. Nc3 exd5 7. exd5 Bg4 8. Be2 Ne7 9. O-O O-O 10. Qb3 b6
Interpolis 1986 – Round 12 – Miles, Anthony J – 1-0 – Ljubojevic, Ljubomir – G41 1. Nf3 c5 2. c4 g6 3. e4 Bg7 4. d4 Nc6 5. dxc5 Qa5+ 6. Nfd2 Qxc5 7. Be2 d6 8. O-O Nd4 9. Bd3 Nf6 10. Nb3 Nxb3
TCh-RUS 2008 – Round 1 – Tomashevsky, Evgeny – 1-0 – Evdokimov, Alexander A. – G34 1. Nf3 g6 2. e4 c5 3. c4 Bg7 4. d4 d6 5. Be2 Nc6 6. d5 Nd4 7. Nxd4 cxd4 8. O-O Qb6 9. Nd2 Nf6 10. Rb1 a5
World Blitz 2006 – Round 3 – Roiz, Michael – 1-0 – Livshits, Gaby – G15 1. e4 c5 2. Nf3 g6 3. c4 Bg7 4. d4 Qb6 5. dxc5 Qxc5 6. Be2 d6 7. O-O Nf6 8. Nc3 O-O 9. h3 a6 10. Be3 Qc6

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