Structure de pions

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	● a6
Arriérés	—	—
Chaînes	—	—
Passés	—	● d5
Majorité	—	—

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● d4 (2v1)	● b4 (2v0), ● c5 (2v0)
Cases faibles	—	● d5, ● g5
Centre	● d4 (2v1)	—

Colonnes et diagonales

	♔ Blancs	♚ Noirs
Semi-ouvertes	● c, ● d	● b, ● e

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 5)
Bc4	● Bc4 Actif (mob. 5)
Be6		● Be6 Mauvais (mob. 3)
Be7		● Be7 Actif (mob. 8)
Paire de fous	● Oui	● Oui
Non développées	3 (● b1, ● c1, ● a1)	1 (● a8)

Sécurité du roi

	♔ Blancs	♚ Noirs
Statut	● Roqué	● Roqué
Droits de roque	—	—

Thèmes

	♔ Blancs	♚ Noirs
Phase	Ouverture
Centre	mobile
Ruptures	—	● …f7-f6

C81i — Spanish: Open, Keres, Ekstrom Variation

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.Qe2 Be7 10.Rd1 O-O 11.c4 bxc4 12.Bxc4 Qd7 * ○ Trait aux Blancs

Ouverture — Centre mobile

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

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Plans. Nc3 (Développer b1 — 90 % des parties) ; Be3 (Fou actif (mobilité 9), Développer c1 — 6 % des parties).

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

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Plans. ...Nxc3 (Menace d1, e2 — 90 % des parties) ; ...f6 (Rupture — 5 % des parties).

Avantages

Faiblesses

Diagonale active

Plans

Partie
1936 Budapest – Round 4 – Steiner, Lajos – 1/2-1/2 – Balogh, Janos – G18 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. c3 Be7 10. Qe2 O-O
1966 Corr – Round 1 – Post, Evan – 0-1 – Nilsson, Zandor – G11 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Be7 10. Rd1 O-O
1967 Corr – Round ? – Heemsoth, Hermann – 1-0 – Erbacher, Peter – G8 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Be7 10. Rd1 O-O
1967 Maribor – Round 14 – Ivkov, Borislav – 1/2-1/2 – Addison, Wiliam G – G79 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 a6 6. Ba4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Be7 10. Rd1 O-O
1967 Sochi – Round 8 – Bogdanovic, Rajko – 1/2-1/2 – Langeweg, Kick – G68 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Be7 10. Rd1 O-O
1968 CSR Ch – Round 1 – Jansa, Vlastimil – 1/2-1/2 – Pachman, Ludek – G6 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Be7 10. Rd1 O-O
1968 IBM-B – Round 5 – Hartoch, Robert G – 1/2-1/2 – Scholl, Eddie C – G21 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Be7 10. Rd1 O-O
1968 Netanya-A – Round 7 – Fischer, Robert J – 1-0 – Ree, Hans – G39 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Be7 10. Rd1 O-O
1969 Athens zt – Round 9 – Jansa, Vlastimil – 1/2-1/2 – Hort, Vlastimil – G48 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Be7 10. Rd1 O-O
Manila Manila PHI 1975 – Round 11 – Ljubojevic, Ljubomir – 1/2-1/2 – Kavalek, Lubomir – G11 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Be7 10. Rd1 O-O
World Blitz 2007 – Round 36 – Leko, Peter – 1/2-1/2 – Carlsen, Magnus – G354 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Be7 10. Rd1 O-O

C81i — Open, Howell Attack, Ekstrom Variation (1936)

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.Qe2 Be7 10.Rd1 O-O 11.c4 bxc4 12.Bxc4 Qd7

Les coups candidats

13.Nc3 — 90.4% (329 parties)

Ambassadeurs : Buj, Pablo (9x), Jansa, Vlastimil (6x), Stieg, Hans-Juergen (6x), Rosino, Antonio (5x), Estrin, Yakov (5x), Ofstad, Per (4x), Asik, Hakan (3x), Corden, Martyn J (3x)

13.Be3 — 5.8% (21 parties)

Ambassadeurs : Meade, Philip James (1x), Jones, John Edwin (1x), Johansen, Mogens Ravn (1x), Kolvig, Bent (1x), Abd Elmonem Aly, Mohammed (1x), Mohammed Omer Khan (1x), Alex, Smith (1x), Blore, John D (1x)

13.Bb3 — 0.8% (3 parties)

Ambassadeurs : Kolbak, Jens (1x), Ivanov, Spiridon (1x), Post, Martin (1x), Nilsson, Zandor (1x), Mietner, Franz (1x), Ofstad, Per (1x)

13.Bxa6 — 0.8% (3 parties)

Ambassadeurs : Novak Andrej (1x), Schidlo (1x), Vanstraelen, Geert (1x), Luyckx, Wim (1x), Bellisario, Carlo (1x), Plyusnin, Aleksey Andreevich (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	13.Nc3	13.Be3	13.Bb3	13.Bxa6
<1800	9	89%	11%	—	—
1800-2200	65	85%	9%	2%	3%
2200-2600	98	92%	5%	1%	—
2600+	2	100%	—	—	—

Évolution par décennie (% des parties)

Décennie	N parties	13.Nc3	13.Be3	13.Bb3	13.Bxa6
1960s	43	88%	5%	5%	—
1970s	140	95%	3%	—	—
1980s	79	87%	8%	—	1%
1990s	56	89%	11%	—	—
2000s	24	75%	12%	4%	4%
2010s	19	95%	—	—	5%
2020s	3	100%	—	—	—

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
13.Nc3	95%	100%	▲ +5.3%
13.Be3	0%	0%	+0.0%
13.Bb3	0%	0%	+0.0%
13.Bxa6	5%	0%	▼ -5.3%

Joueurs célèbres

Champions du monde dans cette position

Carlsen, Magnus — 1 partie

Parties historiques

13.Nc3 — 90.4% (329 parties)

1965 — Messere, Kenneth Charles vs Eriksson, Anders — 0-1 — ?
1966 — Geller, Efim P. vs Larsen, Bent Ravn — 1/2-1/2 — Copenhagen DEN
1967 — Ivkov, Borislav vs Addison, Wiliam G — 1/2-1/2 — Maribor
1967 — Bogdanovic, Rajko vs Langeweg, Kick — 1/2-1/2 — Sochi RUS
1967 — Fucak, Emilio Milko vs Jacobsen, Bo — 1-0 — Groningen NED

13.Be3 — 5.8% (21 parties)

1966 — Johansen, Mogens Ravn vs Kolvig, Bent — 0-1 — Denmark
1967 — Meade, Philip James vs Jones, John Edwin — 1/2-1/2 — Weston-super-Mare
1971 — Nusle vs Crusi More, Ramon — 0-1 — cr.
1974 — Paz y Barriga, Gustavo Ing vs Buj, Pablo — 0-1 — CADAP Sup D-72 APA.VI/41
1974 — Abdi, Andreas vs Johansson, Clas-Erik — 1-0 — ?

13.Bb3 — 0.8% (3 parties)

1966 — Post, Martin vs Nilsson, Zandor — 0-1 — cr.
1969 — Kolbak, Jens vs Ivanov, Spiridon — 1-0 — Dresden GER
2004 — Mietner, Franz vs Ofstad, Per — 0-1 — Halle GER

13.Bxa6 — 0.8% (3 parties)

1988 — Novak Andrej vs Schidlo — 0-1 — cr.
2000 — Vanstraelen, Geert vs Luyckx, Wim — 0-1 — Belgium
2019 — Bellisario, Carlo vs Plyusnin, Aleksey Andreevich — 0-1 — ICCF