C49k — Four Knights: Symmetrical, Blake Variation

1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.O-O O-O 6.d3 d6 7.Bg5 Ne7 8.Nh4 c6 9.Bc4 d5 10.Bb3 Qd6 * ○ Trait aux Blancs

Ouverture — Centre fermé

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Avantages : Bg5 actif, paire de fous.
Faiblesses adverses : Bc8 enfermé.
Plans :
● c3 — Préparer d4

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Avantages : case forte g4, case forte c5, Bb4 actif, paire de fous.
Faiblesses adverses : Bb3 mauvais fou.
Problèmes : Bc8 enfermé.
Plans :
● ...Bf5 — Développer Bc8
● ...c5 — Rupture
● ...d4 — Rupture

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

C49k — Symmetrical Blake Variation

1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.O-O O-O 6.d3 d6 7.Bg5 Ne7 8.Nh4 c6 9.Bc4 d5 10.Bb3 Qd6

Eval: [+0.14]

Les coups candidats

11.f4 — 63.6% (35 parties)

Ambassadeurs : Grill, Roman (2x), Wei, Yi (2x), Khokhlov, Igor (2x), Cohn, Erich (1x), Yates, Frederic D (1x), Lundqvist, Ake (1x), Borsony, Valt (1x), Sojka, Adam (1x)

11.Qf3 — 16.4% (9 parties)

Ambassadeurs : Godena, Michele (2x), Maroczy, Geza (1x), Yates, Frederic D (1x), Tombette, Philippe (1x), Gunnarsson, Magnus (1x), Gallagher, Joseph G. (1x), Golub, Sergey (1x), d Ettorre, Rodolfo (1x)

11.exd5 — 9.1% (5 parties)

Ambassadeurs : Atkins, Henry Ernest (1x), Blake, Joseph (1x), Szabo, Krisztian (1x), Mastrovasilis, Athanasios (1x), Sklyarov, Dmitry V. (1x), Kauppila, Osmo (1x), Vorobiov, Evgeny E. (1x), Balashov, Yuri (1x)

11.Qe2 — 3.6% (2 parties)

Ambassadeurs : Bohatirchuk, Fedor (1x), Yates, Frederic D (1x), Eisen, David J (1x), Aiken, Richard (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	11.f4	11.Qf3	11.exd5	11.Qe2
<1800	1	100%	—	—	—
1800-2200	17	76%	6%	6%	—
2200-2600	23	61%	22%	13%	—
2600+	3	67%	33%	—	—

Évolution par décennie (% des parties)

Décennie	N parties	11.f4	11.Qf3	11.exd5	11.Qe2
1910s	2	50%	—	50%	—
1920s	3	—	33%	—	33%
1950s	1	100%	—	—	—
1960s	1	100%	—	—	—
1970s	1	100%	—	—	—
1990s	5	60%	20%	—	20%
2000s	7	71%	29%	—	—
2010s	30	67%	17%	10%	—
2020s	5	60%	—	20%	—

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
11.f4	67%	60%	▼ -6.7%
11.Qf3	17%	0%	▼ -16.7%
11.exd5	10%	20%	▲ +10.0%
11.Qe2	0%	0%	+0.0%

Parties historiques

11.f4 — 63.6% (35 parties)

1912 — Cohn, Erich vs Yates, Frederic D — 1/2-1/2 — Bad Pistyan CZE
1956 — Lundqvist, Ake vs Borsony, Valt — 1-0 — ICCF
1968 — Sojka, Adam vs Weiner, Alex — 1/2-1/2 — corr ch12-TCH
1977 — Tisdall, Jonathan D vs Formanek, Edward — 0-1 — Lone Pine open
1994 — Blasberg, Gabriel Sergio vs Dadi, Daniel — 1-0 — corr CAPA

11.Qf3 — 16.4% (9 parties)

1922 — Maroczy, Geza vs Yates, Frederic D — 1-0 — London ENG
1996 — Tombette, Philippe vs Gunnarsson, Magnus — 1-0 — NATT4-03
2003 — Gallagher, Joseph G. vs Godena, Michele — 1/2-1/2 — Zurich SUI
2009 — Golub, Sergey vs d Ettorre, Rodolfo — 0-1 — FICGS
2012 — Hindermann, Felix vs Godena, Michele — 0-1 — Switzerland SUI

11.exd5 — 9.1% (5 parties)

1911 — Atkins, Henry Ernest vs Blake, Joseph — 1-0 — Glasgow SCO
2011 — Szabo, Krisztian vs Mastrovasilis, Athanasios — 1/2-1/2 — Cappelle la Grande FRA
2012 — Sklyarov, Dmitry V. vs Kauppila, Osmo — 0-1 — Joensuu FIN
2013 — Vorobiov, Evgeny E. vs Balashov, Yuri — 0-1 — Moscow RUS
2021 — Almarza Mato, Carlos vs Faure, Thierry — 1/2-1/2 — ICCF

11.Qe2 — 3.6% (2 parties)

1925 — Bohatirchuk, Fedor vs Yates, Frederic D — 1/2-1/2 — Moscow RUS
1993 — Eisen, David J vs Aiken, Richard — 1/2-1/2 — NAICCC VII corr

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	—
Chaînes	● c2→d3, d3→e4	● c6→d5, b7→c6
Passés	—	—
Majorité	—	—

Cases

	♔ Blancs	♚ Noirs
Cases fortes	—	● g4 (2v1), ● c5 (2v0)
Cases faibles	—	● f5
Centre	—	● d4 (1v0), ● d5 (4v3), ● e5 (1v0)

Colonnes et diagonales

♔ Blancs

♚ Noirs

Pièces

	♔ Blancs	♚ Noirs
Bb3	● Bb3 Mauvais (mob. 3)
Bg5	● Bg5 Actif (mob. 6)
Bb4		● Bb4 Actif (mob. 4)
Bc8		● Bc8 Non développé (mob. 5)
Paire de fous	● Oui	● Oui
Non développées	1 (a1)	2 (c8, a8)

Sécurité du roi

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

Thèmes

	♔ Blancs	♚ Noirs
Phase	Ouverture
Centre	fermé
Ruptures	● d3-d4, ● f2-f3	● …c6-c5, ● …d5-d4

Partie
1911 BCF Ch 8th – Round 9 – Atkins, Henry Ernest – 1-0 – Blake, Joseph – G14 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Ne7 8. Nh4 c6 9. Bc4 d5 10. Bb3 Qd6
1912 Bad Pistyan – Round 2 – Cohn, Erich – 1/2-1/2 – Yates, Frederic D – G4 1. e4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Ne7 8. Nh4 c6 9. Bc4 d5 10. Bb3 Qd6
1922 Hastings Six-Masters – Round ? – Tarrasch, Siegbert – 1-0 – Yates, Frederic D – G25 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Ne7 8. Nh4 c6 9. Bc4 d5 10. Bb3 Qd6
1922 London – Round 8 – Maroczy, Geza – 1-0 – Yates, Frederic D – G19 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Ne7 8. Bc4 c6 9. Nh4 d5 10. Bb3 Qd6
1925 Moscow – Round 1 – Bohatirchuk, Fedor – 1/2-1/2 – Yates, Frederic D – G109 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Ne7 8. Nh4 c6 9. Bc4 d5 10. Bb3 Qd6
6. World Blitz 2010 – Round 36 – Caruana, Fabiano – 0-1 – Aronian, Levon – G267 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. d3 d6 6. O-O O-O 7. Bg5 Ne7 8. Nh4 c6 9. Bc4 d5 10. Bb3 Qd6

1911 BCF Ch 8th – Round 9 – Atkins, Henry Ernest – 1-0 – Blake, Joseph – G14

1912 Bad Pistyan – Round 2 – Cohn, Erich – 1/2-1/2 – Yates, Frederic D – G4

1922 Hastings Six-Masters – Round ? – Tarrasch, Siegbert – 1-0 – Yates, Frederic D – G25

1922 London – Round 8 – Maroczy, Geza – 1-0 – Yates, Frederic D – G19

1925 Moscow – Round 1 – Bohatirchuk, Fedor – 1/2-1/2 – Yates, Frederic D – G109

6. World Blitz 2010 – Round 36 – Caruana, Fabiano – 0-1 – Aronian, Levon – G267