C49n — Four Knights: Symmetrical, Metger unpin

1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.O-O O-O 6.d3 d6 7.Bg5 Bxc3 8.bxc3 Qe7 * ○ Trait aux Blancs

Ouverture — Centre fermé

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Atouts. Les Blancs s'appuient sur la case forte c4, des fous actifs en b5 et g5, la paire de fous et la colonne semi-ouverte b.

Côté adverse. Le fou enfermé en c8.

En contrepartie. Le pion isolé a2.

Plans. h3 (Empêcher ...Bg4) ; c3 (Préparer d4) ; Tour sur colonne b.

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Atouts. Les Noirs s'appuient sur la case forte g4.

Côté adverse. Le pion isolé a2 et un mauvais fou en b5.

En contrepartie. Plusieurs pièces dorment encore (le fou c8 et la tour a8).

Plans. ...Bg4 (Développer Bc8, clouer Nf3) ; ...d5 (Rupture).

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

	♔ Blancs	♚ Noirs
Pions doublés	● c2, ● c3	—
Pions isolés	● a2	—
Arriérés	—	—
Chaînes	● c2→d3, d3→e4	● d6→e5, c7→d6
Passés	—	—
Majorité	—	—

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● c4 (2v0)	● g4 (2v0)
Cases faibles	—	—
Centre	—	● e5 (3v1)

Colonnes et diagonales

	♔ Blancs	♚ Noirs
Semi-ouvertes	● b	—

Pièces

	♔ Blancs	♚ Noirs
Bb5	● Bb5 Actif (mob. 4)
Bg5	● Bg5 Actif (mob. 7)
Bc8		● Bc8 Non développé (mob. 5)
Paire de fous	● Oui	Non
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	● c3-c4, ● d3-d4	● …d6-d5

Partie
1902 DSB-13.Kongress – Round 1 – Cohn, Wilhelm – 0-1 – Von Bardeleben, Curt – G3 1. e4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 7. bxc3 d6 8. Bg5 Qe7 9. Rb1 Nd8 10. Bc4 Be6
1906 DSB-15.Kongress – Round 6 – Cohn, Erich – 1/2-1/2 – Tarrasch, Siegbert – G31 1. e4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Bxc6 bxc6 10. Qd2 h6
1907 Karlsbad – Round 1 – Janowski, Dawid – 0-1 – Rubinstein, Akiba – G149 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 7. bxc3 d6 8. Bg5 Qe7 9. Qd2 Nd8 10. Bc4 Be6
1907 Ostende II – Round 7 – Cohn, Wilhelm – 0-1 – Spielmann, Rudolf – G93 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. d3 d6 6. O-O O-O 7. Bg5 Bxc3 8. bxc3 Qe7 9. Nd2 h6 10. Be3 Ng4
1908 Vienna – Round 2 – Reti, Richard – 0-1 – Cohn, Erich – G27 1. e4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 7. bxc3 d6 8. Bg5 Qe7 9. Bxc6 bxc6 10. Qd2 h6
1908 Vienna – Round 3 – Marshall Viele, Fabrizio Aaron – 1-0 – Reti, Richard – G38 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 7. bxc3 d6 8. Bg5 Qe7 9. h3 Nd8 10. Bc4 Be6
1908 Vienna – Round 6 – Reti, Richard – 0-1 – Teichmann, Richard – G66 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 7. bxc3 d6 8. Bg5 Qe7 9. Bxc6 bxc6 10. Qd2 Qe6
1909 BCF Ch 6th – Round 11 – Jacobs, Herbert Levi – 0-1 – Blake, Joseph – G47 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Re1 h6 10. Bc1 Bd7
1909 BCF Ch 6th – Round 8 – Mackenzie, Arthur J – 0-1 – Blake, Joseph – G34 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. h3 Nd8 10. Bc4 Ne6
1910 Hamburg Hauptturnier-B – Round ? – Barasz, Zsigmond – 1-0 – Lowtzky, Mojsesz – G15 1. e4 e5 2. Nf3 Nf6 3. Nc3 Nc6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 7. bxc3 d6 8. Bg5 Qe7 9. Bxc6 bxc6 10. c4 Rb8
1913 Rotterdam m – Round 11 – Davidson, Jacques – 1-0 – Oskam, Gerard – G10 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. h3 Nd8 10. Nh2 Ne6
1920 Berlijn – Round 7 – Tarrasch, Siegbert – 1-0 – Saemisch, Friedrich – G20 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. h3 Nd8 10. Re1 Ne6
1920 Moskou ch-URS – Round 4 – Kubbel, Arvid – 1-0 – Rabinovich, Ilya Mar – G6 1. e4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Re1 Nd8 10. Bc4 Be6
1922 Bad Oeynhausen – Round 11 – Post, Erhard – 1-0 – Zander, Otto – G25 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Re1 Bg4 10. h3 Bxf3
1923 DSB-23.Kongress – Round 7 – Post, Erhard – 1/2-1/2 – Gruenfeld, Ernst – G25 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 7. bxc3 d6 8. Bg5 Qe7 9. Bxc6 bxc6 10. Re1 h6
1926 Vienna – Round 1.2 – Wagner, Heinrich – 0-1 – Becker, Albert – G7 1. e4 e5 2. Nf3 Nf6 3. Nc3 Nc6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Bxc6 bxc6 10. Qc1 h6
1927 New York – Round 1 – Marshall Viele, Fabrizio Aaron – 1/2-1/2 – Vidmar Milan – G12 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 7. bxc3 d6 8. Bg5 Qe7 9. Bxc6 bxc6 10. Rb1 h6
1928 Budapest – Round 1 – Vajda, Arpad – 1/2-1/2 – Capablanca, Jose – G33 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Bxc6 bxc6 10. Rb1 h6
1929 Karlsbad – Round 14 – Gruenfeld, Ernst – 1/2-1/2 – Capablanca, Jose – G190 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Bxc6 bxc6 10. Nd2 h6
1933 GER Ch 1st – Round 6 – Leonhardt, Paul – 0-1 – Saemisch, Friedrich – G22 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Qd2 Nd8 10. d4 Ne6
1935 Moscow – Round 15 – Bohatyrchuk, Fedir Parfenovych – 1-0 – Botvinnik, Mikhail – G72 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Re1 a6 10. Bc4 Na5
1936 Moscow – Round 1 – Lilienthal, Andor – 1/2-1/2 – Capablanca, Jose – G25 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Bxc6 bxc6 10. h3 h6
1938 URS Ch, semi final – Round 1 – Rabinovich, Ilya Mar – 1-0 – Gothilf, Solomon Borisovich – G55 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. Nc3 Bb4 5. O-O O-O 6. d3 Bxc3 7. bxc3 d6 8. Bg5 Qe7 9. h3 Nd8 10. Nh2 Ne6
1939 Leningrad ch-URS – Round 11 – Lisitsin, Georgy – 1/2-1/2 – Botvinnik, Mikhail – G91 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Nd2 h6 10. Bh4 Nd8
1940 Rakovnik – Round 5 – Krticka F – 1/2-1/2 – Pokorny, Amos – G29 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 7. bxc3 d6 8. Bg5 Qe7 9. Bxc6 bxc6 10. Rb1 h6
1942 EST Ch – Round 6 – Sepp, Leopold – 0-1 – Keres, Paul – G6 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Bxc6 bxc6 10. Qe2 h6
1945 Novi Sad – Round 17 – Trifunovic, Petar – 1-0 – Gligorić, Svetozar – G169 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Bxc6 bxc6 10. Nd2 h6
1946 Augsburg 1st – Round 13 – Endzelins, Lucius – 1-0 – Saemisch, Friedrich – G24 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Bxc6 bxc6 10. Qd2 h6
1946 Nt – Round 9 – Endzelins, Lucius – 1/2-1/2 – Rankis, August – G12 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Bxc6 bxc6 10. Qd2 h6
1946 Nt Augsburg GER – Round 13 – Endzelins, Lucius – 1-0 – Saemisch, Friedrich – G27 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Bxc6 bxc6 10. Qd2 Be6
1947 Hilversum zt – Round 11 – Trifunovic, Petar – 0-1 – Pachman, Ludek – G40 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 7. bxc3 d6 8. Bg5 Qe7 9. Bxc6 bxc6 10. Qc1 h6
1947 Hilversum zt – Round 12 – Plater, Kazimierz – 1/2-1/2 – Alexander Ronald Cheng – G32 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Bxc6 bxc6 10. h3 Be6
1947 Leningrad ch-URS – Round 6 – Keres, Paul Petrovich – 1/2-1/2 – Lilienthal, Andor – G75 1. e4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 7. bxc3 d6 8. Bg5 Qe7 9. Bxc6 bxc6 10. c4 c5
1948 Berlin GER – Round 1 – Richter, Kurt P – 1-0 – Teschner, Rudolf – G2 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. Nc3 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Nd2 Nd8 10. f4 exf4
1949 Oldenburg – Round 10 – Wade, Robert G – 1/2-1/2 – Enevoldsen, Jens – G34 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 7. bxc3 d6 8. Bg5 Qe7 9. Nd2 h6 10. Bxf6 Qxf6
1949 Trencianske-Teplice – Round 14 – Wade, Robert G – 0-1 – Sefc, Jan – G56 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 7. bxc3 d6 8. Bg5 Qe7 9. Nd2 Nd8 10. f4 exf4
1951 Augsburg – Round 14 – Kieninger, Georg – 1/2-1/2 – Teschner, Rudolf – G50 1. e4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Bxc6 bxc6 10. Nd2 h6
1951 Paignton Premier – Round 3 – Kitto, Francis E A – 0-1 – Euwe, Max – G5 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Bxc6 bxc6 10. Rb1 h6
1952 Chester ch-BCF – Round 9 – Clarke, Peter H – 1-0 – Green, Arnold Yorvath – G22 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 7. bxc3 d6 8. Bg5 Qe7 9. Bxc6 bxc6 10. Rb1 h6
1953 Opatija IT – Round 16 – Bertok, Mario Jr. – 1/2-1/2 – Fuderer, Andrija – G17 1. e4 e5 2. Nf3 Nf6 3. Nc3 Nc6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 7. bxc3 d6 8. Bg5 Qe7 9. Bxc6 bxc6 10. Re1 Bg4
1955 Marshall CC Ch 5556 – Round 14 – Drakert, William – 0-1 – Santasiere, Anthony – G37 1. e4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 7. bxc3 d6 8. Bg5 Qe7 9. Bxc6 bxc6 10. h3 h6
1955 Novi Sad – Round 6 – Janosevic, Dragoljub – 1/2-1/2 – Gligorić, Svetozar – G59 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Nd2 h6 10. Bxf6 Qxf6
1957 Przepiorka Memorial – Round 3 – Fichtl, Jiri – 0-1 – Kholmov, Ratmir D – G19 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 7. bxc3 d6 8. Bg5 Qe7 9. Re1 a6 10. Bxc6 bxc6
1957 Sofia zt Sofia BUL – Round 1 – Zita, Filip – 0-1 – Sliwa, Bogdan – G50 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. d3 d6 6. Bg5 O-O 7. O-O Bxc3 8. bxc3 Qe7 9. Nd2 h6 10. Bh4 Nd8
1962 Hungary – Round 15 – Bakos, S – 0-1 – Szabo, Ladislav – G119 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Bxc6 bxc6 10. h3 h6
1962 Kiev (Ukraine) – Round 8 – Zurakhov, Vladlen Y – 1/2-1/2 – Kots, Yuri I – G15 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Re1 h6 10. Bc1 a6
1962 Open – Round 2 – Blackstone, John – 1/2-1/2 – Sprague, B. – G4 1. e4 e5 2. Nf3 Nf6 3. Nc3 Nc6 4. Bb5 Bb4 5. O-O d6 6. d3 O-O 7. Bg5 Bxc3 8. bxc3 Qe7 9. Qd2 Nd8 10. Bc4 Be6
1963 Zenica ch YUG – Round 12 – Mestrovic, Zvonimir – 1/2-1/2 – Sokolov, Vladimir – G68 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. Nc3 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Bxc6 bxc6 10. Re1 h6
1964 SWE Ch – Round ? – Carlsson, Sven – 1/2-1/2 – Lundin, Erik – G49 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Bxc6 bxc6 10. Nd2 h6
1966 URS Team Ch – Round 1 – Keres, Paul Petrovich – 1/2-1/2 – Tal, Mikhail – G67 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Bxc6 bxc6 10. Rb1 h6
1967 Corr – Round ? – Morgado, Juan Sebastian – 1/2-1/2 – Castelli, Raul A – G10 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. Nc3 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Nd2 h6 10. Bh4 g5
1967 Sousse Interzonal – Round 1 – Suttles, Duncan – 0-1 – Gligoric, Svetozar – G6 1. e4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Bxc6 bxc6 10. Re1 h6
1968 Alma Ata ch-URS – Round 5 – Bagirov, Vladimir – 1/2-1/2 – Zaitsev, Igor A – G61 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Re1 Bg4 10. h3 Bh5
1968 IBM-B – Round 10 – Van Oosterom, Hennie – 1/2-1/2 – Van Geet, Dirk Daniel – G33 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. Nc3 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. h3 h6 10. Bxf6 Qxf6
1968 Vinkovci – Round 12 – Ivkov, Borislav – 1/2-1/2 – Matanovic, Aleksandar – G69 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 7. bxc3 d6 8. Bg5 Qe7 9. Bxc6 bxc6 10. Nd2 h6
World Rapid 2016 – Round 1.37 – Naiditsch, Arkadij – 1/2-1/2 – Hirneise, Tobias – G30 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 7. bxc3 d6 8. Bg5 Qe7 9. Re1 a6 10. Bxc6 bxc6

C49n — Symmetrical Metger unpin

1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.O-O O-O 6.d3 d6 7.Bg5 Bxc3 8.bxc3 Qe7

Eval: [+0.33]

Les coups candidats

9.Re1 — 75.0% (1754 parties)

Ambassadeurs : Iuldachev, Saidali (14x), Khamatgaleev, Alexej (10x), Jovanovic, Bratislav M (9x), Rubinstein, Akiba (8x), Istratescu, Andrei (8x), Wolf Heinrich (7x), Jussupow, Artur (7x), Nunn, John D M (7x)

9.Bxc6 — 8.8% (206 parties)

Ambassadeurs : Keres, Paul Petrovich (4x), Capablanca, Jose (3x), Endzelins, Lucius (3x), Donaldson-A, Elena (3x), Pachman, Ludek (3x), Hort, Vlastimil (3x), Pesotskyi, Vitalii (3x), Van Foreest, Arnold (2x)

9.Nd2 — 5.6% (130 parties)

Ambassadeurs : Nitin, S. (7x), Meier, Volker (4x), Skacelova, Libuse (3x), Te Kolste, Jan Willem (2x), Richter, Kurt P (2x), Wade, Robert G (2x), Lasker, Emanuel (2x), Mendez, Axel R (2x)

9.h3 — 4.6% (107 parties)

Ambassadeurs : Dobrowolski, Aleksander (2x), Goldstein, Brian (2x), Rabinovich, Ilya Mar (1x), Gothilf, Solomon Borisovich (1x), Poliak, Evsey (1x), Lipnitsky, Isaac (1x), Gale, Sydney (1x), Sim, Malcolm (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	9.Re1	9.Bxc6	9.Nd2	9.h3
<1800	42	69%	7%	2%	7%
1800-2200	580	72%	6%	7%	7%
2200-2600	1046	80%	7%	5%	3%
2600+	45	91%	7%	2%	—

Évolution par décennie (% des parties)

Décennie	N parties	9.Re1	9.Bxc6	9.Nd2	9.h3
1890s	5	—	80%	—	—
1900s	43	67%	19%	5%	5%
1910s	40	78%	2%	12%	5%
1920s	50	74%	12%	6%	2%
1930s	25	60%	8%	16%	8%
1940s	44	61%	25%	11%	2%
1950s	50	74%	18%	4%	2%
1960s	40	70%	20%	2%	5%
1970s	34	47%	32%	15%	—
1980s	82	60%	22%	11%	1%
1990s	494	79%	6%	3%	3%
2000s	624	72%	7%	8%	7%
2010s	679	81%	6%	4%	5%
2020s	128	74%	8%	3%	7%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
9.Re1	81%	74%	▼ -6.5%
9.Bxc6	6%	8%	▲ +1.3%
9.Nd2	4%	3%	▼ -0.9%
9.h3	5%	7%	▲ +2.3%

Joueurs célèbres

Champions du monde dans cette position

Botvinnik, Mikhail — 5 parties
Euwe, Max — 5 parties
Alekhine, Alexander — 2 parties
Lasker, Emanuel — 2 parties
Tal, Mikhail — 2 parties
Smyslov, Vladimir — 2 parties
Anand, Viswanathan — 2 parties
Karpov, Anatoly — 2 parties
Hou, Yifan — 1 partie

Parties historiques

9.Re1 — 75.0% (1754 parties)

1906 — Wolf Heinrich vs Vidmar, Milan Sr — 1/2-1/2 — Nuerenberg GER
1906 — Perlis, Julius vs Wolf Heinrich — 1-0 — Ostend
1906 — Wolf Heinrich vs Cohn, Erich — 1-0 — Nuerenberg GER
1907 — Znosko-Borovsky, Eugene vs Salwe, Georg H S — 1-0 — Lodz POL
1907 — Důras, Oldřich vs Rubinstein, Akiba — 0-1 — Carlsbad CZE

9.Bxc6 — 8.8% (206 parties)

1893 — Von Bardeleben, Curt vs Metger, Johannes — 1/2-1/2 — Kiel GER
1898 — Alapin, Simon vs Schlechter, Carl — 0-1 — Vienna AUT
1899 — Tresling, Jan Diderik vs Van Foreest, Arnold — 1/2-1/2 — Amsterdam NED
1899 — Tresling, Joan Diderik vs Van Foreest, Arnold — 1/2-1/2 — Amsterdam NED
1900 — Lawrence, Thomas F vs Physick, Thomas — 1-0 — London ENG

9.Nd2 — 5.6% (130 parties)

1907 — Cohn, Wilhelm vs Spielmann, Rudolf — 0-1 — Ostende II
1907 — Heilmann, Ernst vs Von Scheve, Theodor — 0-1 — Berlin GER
1911 — Consultants vs Dus Chotimirsky, Fedor — 0-1 — Paris FRA
1912 — Te Kolste, Jan Willem vs Baudet, Henry — 1/2-1/2 — Delft NED
1912 — Tyroler, Alexandru vs Steiner, Bruno — 1-0 — Temesvary

9.h3 — 4.6% (107 parties)

1908 — Marshall Viele, Fabrizio Aaron vs Reti, Richard — 1-0 — Vienna AUT
1909 — Mackenzie, Arthur J vs Blake, Joseph — 0-1 — Scarborough ENG
1913 — Davidson, Jacques vs Oskam, Gerard — 1-0 — Rotterdam NED
1916 — Gale, Sydney vs Sim, Malcolm — 1-0 — Toronto CAN
1920 — Tarrasch, Siegbert vs Saemisch, Friedrich — 1-0 — Berlin GER

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