E21l — Nimzo-Indian: Nimzo-Queen’s Hybrid, 5.Bg5 Bb7

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3 b6 5.Bg5 Bb7 *   ○ Trait aux Blancs

Ouverture — Centre semi-ouvert

♔ Point de vue Blancs

8 7 6 5 4 3 2 1
bR
bN
bQ
bKRoi au centre — vulnérable
bR
bP
bB
bP
bP
bP
bP
bP
bP
bP
bN
Case forte (2v0)
Case forte (2v0)
wBFou actif — mobilité 7
bB
wP
wPCase forte (2v0)
wN
wN
wP
wP
wP
wP
wP
wP
wR
wQ
wK
wB
wR
abcdefgh
Avantages : case forte d4, case forte b5, case forte e5, Bg5 actif, paire de fous.
Faiblesses adverses : roi noir au centre.
Problèmes : roi au centre, Bf1 enfermé, 3 pièces non développées (F1, A1, H1).
Plans :
● O-O — Mettre le roi en sécurité, connecter les tours
● e4 — Centre d4+e4, menace e5 (Nf6 cloué par Bg5), libère Bf1
● h3 — Empêcher ...Bg4

♚ Point de vue Noirs

1 2 3 4 5 6 7 8
wR
wBFou enfermé — mobilité 0
wKRoi au centre — doit roquer
wQ
wR
wP
wP
wP
wP
wP
wP
wN
wN
Case forte (2v1)
wP
wP
bBFou actif — mobilité 7
wB
bN
bP
bP
bP
bP
bP
bP
bP
bBFou actif — mobilité 6
bP
bR
bK
bQ
bN
bR
hgfedcba
Avantages : case forte e4, Bb4 actif, Bb7 actif, paire de fous.
Faiblesses adverses : Bf1 enfermé, roi blanc au centre.
Problèmes : roi au centre, 3 pièces non développées (B8, A8, H8).
Plans :
● O-O — Mettre le roi en sécurité, connecter les tours
● ...Nc6 — Développer Nb8
● ...Bg4 — Clouer Nf3
● ...c5 — Rupture
● ...d6 — Rupture
Avantages
Faiblesses adverses
Diagonale active
Plans

Structure de pions
E21l — Nimzo-Queen’s Hybrid
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3 b6 5.Bg5 Bb7
Eval: [+0.00]
Les coups candidats
6.e3 — 63.3% (3159 parties)
Ambassadeurs : Timman, Jan H (21x), Bacrot, Etienne (19x), Roeder, Matthias (18x), Miles, Anthony J (15x), Lukacs, Peter (14x), Campos Moreno, Javier B. (14x), Rogozenco, Dorian (14x), Furman, Boris (14x)
6.Nd2 — 19.4% (970 parties)
Ambassadeurs : Svetushkin, Dmitry (15x), Malakhatko, Vadim (12x), Moiseenko, Alexander (11x), Pert, Nicholas (10x), Tarasova, Viktoriya (9x), Johannessen, Leif Erlend (7x), Sargissian, Gabriel (7x), Schulenberg, Henk A T (7x)
6.Qc2 — 6.3% (314 parties)
Ambassadeurs : Stocek, Jiri (13x), Markos, Jan (8x), Bellon Lopez, Juan Manuel (6x), Dreev, Aleksey (6x), Uhlmann, Wolfgang (3x), Giorgadze, Giorgi Gel (3x), Kempinski, Robert (3x), Van der Heijden, Ton (3x)
6.Qb3 — 4.3% (217 parties)
Ambassadeurs : Halkias, Stelios (6x), Hjorth, Jesper (6x), Jianu, Vlad-Cristian (5x), Mchedlishvili, Mikheil (4x), Seirawan, Yasser (3x), Sokolov, Ivan (3x), Dzindzichashvili, Roman (2x), Ahmed, Esam Aly (2x)
Analyse statistique des coups candidats
Répartition par niveau Elo (% des parties)
Tranche Elo N parties 6.e3 6.Nd2 6.Qc2 6.Qb3
<1800 115 65% 3% 13% 4%
1800-2200 1245 67% 11% 7% 5%
2200-2600 2609 59% 27% 6% 4%
2600+ 207 46% 42% 5% 5%
Évolution par décennie (% des parties)
Décennie N parties 6.e3 6.Nd2 6.Qc2 6.Qb3
1910s 1 100%
1920s 19 58% 16% 11%
1930s 22 55% 18% 5%
1940s 15 60% 7% 7%
1950s 49 71% 4% 6% 8%
1960s 83 81% 2% 8%
1970s 54 85% 6% 2%
1980s 496 86% 1% 7% 1%
1990s 785 81% 5% 5% 3%
2000s 1850 53% 30% 5% 6%
2010s 1421 58% 24% 7% 4%
2020s 197 56% 18% 9% 5%
Tendances récentes (2010s → 2020s)
Coup 2010s 2020s Δ
6.e3 58% 56% ▼ -1.6%
6.Nd2 24% 18% ▼ -6.3%
6.Qc2 7% 9% ▲ +2.3%
6.Qb3 4% 5% ▲ +0.6%
Joueurs célèbres
Champions du monde dans cette position
Tal, Mikhail — 10 parties
Kasparov, Garry — 8 parties
Anand, Viswanathan — 6 parties
Botvinnik, Mikhail — 3 parties
Smyslov, Vladimir — 3 parties
Carlsen, Magnus — 3 parties
Karpov, Anatoly — 3 parties
Alekhine, Alexander — 2 parties
Euwe, Max — 2 parties
Hou, Yifan — 2 parties
Ju, Wenjun — 2 parties
Karpov, Aleksandr — 1 partie
Parties historiques
6.e3 — 63.3% (3159 parties)
1915 — Nenarokov, Vladimir vs Alekhine, Alexander — 0-1 — Moscow RUS
1920 — Von Gelder vs Euwe, Max — 0-1 — Amsterdam NED
1920 — Sjoberg, Victor vs Saemisch, Friedrich — 1/2-1/2 — Goteborg SWE
1923 — Prochazka, Hubert vs Tereba, R. — 1/2-1/2 — Pardubice CZE
1925 — Janowsky, D. vs Nimzowitsch, A. — 0-1 — Marienbad CZE
6.Nd2 — 19.4% (970 parties)
1955 — Shaposhnikov, Yury vs Sokolsky, Alexey — 0-1 — URS
1955 — Mueller, EH vs Bermudez Adams, William — 0-1 — San Jose, CA USA
1960 — From, Sigfred vs Neergaard, Holger — 0-1 — Denmark ch corr
1966 — Acosta Garcia, Rafael Isaac vs Kolarov, Atanas S. — 1-0 — Bucharest ROU
1984 — Groszpeter, Attila vs Lukacs, Peter — 1/2-1/2 — Sochi RUS
6.Qc2 — 6.3% (314 parties)
1928 — Tarrasch, Siegbert vs Marshall Viele, Fabrizio Aaron — 1/2-1/2 — Bad Kissingen GER
1929 — Nimzowitsch, Aron vs Colle, Edgar — 1/2-1/2 — Carlsbad CZE
1929 — Treybal, Karel vs Gilg, Carl — 1-0 — Carlsbad CZE
1931 — Castillo Lynch, Jacob Tyler vs Holtey, Guillermo — 0-1 — Argentina
1933 — Levenfish, Grigory vs Chekhover, Vitaly — 1-0 — Leningrad ch-URS
6.Qb3 — 4.3% (217 parties)
1926 — Tarrasch, Siegbert vs Rosselli del Turco, Stefano — 1-0 — Semmering AUT
1926 — Koenig, Imre vs Bluemich, Max — 1/2-1/2 — Vienna AUT
1938 — Nedeljkovic, Aleksandar vs Brueder, M. — 1/2-1/2 — Ljubljana
1945 — Castillo Lynch, Jacob Tyler vs Benko, Filip — 0-1 — Buenos Aires ARG
1951 — Kuttis, N. vs Anderson, Frank Ross — 0-1 — Toronto CAN
♔ Blancs ♚ Noirs
Pions doublés
Pions isolés
Arriérés
Chaînes ● a7→b6, c7→b6, d7→e6, f7→e6
Passés
Majorité
Cases
♔ Blancs ♚ Noirs
Cases fortes ● d4 (2v0), ● b5 (2v0), ● e5 (2v0) ● e4 (2v1)
Cases faibles
Centre ● d4 (2v0), ● e5 (2v0) ● d5 (3v2), ● e4 (2v1)
Colonnes et diagonales
♔ Blancs ♚ Noirs
Pièces
♔ Blancs ♚ Noirs
Bf1 ● Bf1 Non développé (mob. 0)
Bg5 ● Bg5 Actif (mob. 7)
Bb4 ● Bb4 Actif (mob. 7)
Bb7 ● Bb7 Actif (mob. 6)
Paire de fous ● Oui ● Oui
Clouages ● knight c3
Non développées 3 (f1, a1, h1) 3 (b8, 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 ● c4-c5, ● d4-d5, ● e2-e3 ● …c7-c6, ● …c7-c5, ● …d7-d6, ● …d7-d5, ● …e6-e5
Partie
1920 Gothenburg-B – Round 13 – Sjoberg, Victor – 1/2-1/2 – Saemisch, Friedrich – G78
1. d4 Nf6 2. Nf3 e6 3. c4 b6 4. Nc3 Bb7 5. Bg5 Bb4 6. e3 c5 7. dxc5 bxc5 8. Bd3 Qa5 9. O-O Bxc3 10. bxc3 O-O
1926 DSV Kongress – Round 9 – Koenig, Imre – 1/2-1/2 – Bluemich, Max – G35
1. d4 Nf6 2. Nf3 b6 3. c4 Bb7 4. Nc3 e6 5. Bg5 Bb4 6. Qb3 c5 7. dxc5 Bxc5 8. e3 O-O 9. Be2 Nc6 10. O-O Be7
1926 Semmering Panhans – Round 14 – Tarrasch, Siegbert – 1-0 – Rosselli del Turco, Stefano – G15
1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Bg5 Bb7 5. Nc3 Bb4 6. Qb3 c5 7. a3 Bxc3+ 8. Qxc3 Na6 9. e3 h6 10. Bh4 O-O
1927 DSB-25.Kongress – Round 10 – List, Paul – 1/2-1/2 – Ahues, Carl – G47
1. d4 Nf6 2. Nf3 b6 3. c4 Bb7 4. Nc3 e6 5. Bg5 Bb4 6. Rc1 O-O 7. e3 d6 8. a3 Bxc3+ 9. Rxc3 Nbd7 10. Be2 h6
1929 Bradley Beach – Round 4 – Kupchik, Abraham – 1-0 – Fox, Mark – G16
1. c4 Nf6 2. Nf3 e6 3. d4 b6 4. Bg5 Bb7 5. Nc3 Bb4 6. e3 h6 7. Bxf6 Qxf6 8. Rc1 Bxc3+ 9. Rxc3 d6 10. Bd3 Nd7
1932 Berlin Ch – Round 10 – Richter, Kurt P – 1-0 – Koch, Berthold – G30
1. d4 Nf6 2. Nf3 e6 3. c4 b6 4. Nc3 Bb7 5. Bg5 Bb4 6. e3 Bxc3+ 7. bxc3 d6 8. Bd3 Nbd7 9. Qe2 Qe7 10. O-O h6
1933 Folkestone Olympiad V – Round 7.7 – Glass, Eduard – 1-0 – Duchamp, Marcel – G22
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 b6 5. Bg5 Bb7 6. Rc1 O-O 7. e3 d6 8. Be2 Nbd7 9. O-O Bxc3 10. Rxc3 Qe8
1937 Ostende – Round 8 – List, Paul – 1-0 – Dunkelblum, Arthur – G40
1. Nf3 Nf6 2. d4 b6 3. c4 e6 4. Nc3 Bb7 5. Bg5 Bb4 6. Rc1 h6 7. Bd2 O-O 8. e3 d5 9. Be2 Nbd7 10. O-O Be7
1937 Prague – Round 4 – Zinner, Emil – 1/2-1/2 – Eliskases, Erich – G20
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 b6 5. Bg5 Bb7 6. e3 h6 7. Bxf6 Qxf6 8. Be2 Bxc3+ 9. bxc3 O-O 10. O-O d6
1940 New York – Round 1 – Chernev, Irving – 1-0 – Cruz, Walter – G5
1. d4 Nf6 2. Nf3 b6 3. c4 Bb7 4. Nc3 e6 5. Bg5 Bb4 6. Rc1 h6 7. Bh4 g5 8. Bg3 Ne4 9. e3 h5 10. d5 h4
1943 BRA Ch m – Round 6 – De Souza Mendes, Joao – 0-1 – Charlier, Antoine – G6
1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb7 5. Bg5 Bb4 6. e3 O-O 7. Qc2 Be4 8. Qb3 Bxc3+ 9. Qxc3 d6 10. Nd2 Bb7
1943 Prague – Round 2 – Novotny, Oldrich – 0-1 – Foltys, Jan – G13
1. d4 Nf6 2. Nf3 b6 3. c4 Bb7 4. Nc3 e6 5. Bg5 Bb4 6. Rc1 h6 7. Bh4 g5 8. Bg3 Ne4 9. e3 h5 10. h3 Nxg3
1946 Arbon – Round 2 – Bickel, Gustav – 0-1 – Yanofsky, Daniel Abraham – G3
1. d4 Nf6 2. Nf3 e6 3. c4 b6 4. Nc3 Bb4 5. Bg5 Bb7 6. e3 h6 7. Bxf6 Qxf6 8. Be2 Bxc3+ 9. bxc3 O-O 10. O-O d6
1946 POL Ch – Round 21 – Borowski, Natan – 1-0 – Gawlikowski, Stanislaw – G122
1. d4 Nf6 2. Nf3 b6 3. c4 e6 4. Bg5 Bb4+ 5. Nc3 Bb7 6. e3 O-O 7. Qc2 h6 8. Bh4 d6 9. a3 Bxc3+ 10. Qxc3 Nbd7
1950 DDR Ch – Round 15 – Krause, Kurt – 0-1 – Platz, Hans – G30
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 b6 5. Bg5 Bb7 6. Rc1 h6 7. Bxf6 Qxf6 8. e3 O-O 9. Be2 Re8 10. O-O Bf8
1953 Candidats Tournament – Round 29 – Stahlberg, Gideon – 1/2-1/2 – Euwe, Max – G190
1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb7 5. Bg5 Bb4 6. Rc1 h6 7. Bxf6 Qxf6 8. e3 O-O 9. Be2 d6 10. O-O Bxc3
1954 Amsterdam olm – Round 1 – Staahlberg, Gideon – 1/2-1/2 – Pirc, Vasja – G67
1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb7 5. Bg5 Bb4 6. Rc1 h6 7. Bxf6 Qxf6 8. e3 O-O 9. Be2 d6 10. O-O Bxc3
1954 CSR Ch – Round 8.7 – Podgorny, Jiri – 1/2-1/2 – Kozma, Julius – G70
1. d4 Nf6 2. c4 e6 3. Nc3 b6 4. Nf3 Bb7 5. Bg5 Bb4 6. Qb3 a5 7. a3 a4 8. Qc2 Bxc3+ 9. bxc3 d6 10. e3 Nbd7
1954 URS Team Ch – Round 9 – Shaposhnikov, Yury – 0-1 – Konstantinopolsky, Alexander – G157
1. d4 Nf6 2. Nf3 b6 3. c4 Bb7 4. Nc3 e6 5. Bg5 Bb4 6. Qb3 Qe7 7. a3 Bxc3+ 8. Qxc3 h6 9. Bf4 d6 10. Nd2 Nbd7
1954 US Open 55th – Round 1 – Sandrin, Albert – 0-1 – Rossolimo, Nicolas – G1
1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb7 5. Bg5 Bb4 6. Qb3 a5 7. a3 Bxc3+ 8. Qxc3 h6 9. Bf4 d6 10. g3 g5 0-1
1957 URS Ch sf – Round 1 – Kalashian, Loris – 0-1 – Mnatsakanian, Eduard A – G5
1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb7 5. Bg5 Bb4 6. e3 Bxc3+ 7. bxc3 d6 8. Bd3 Nbd7 9. O-O h6 10. Bh4 g5
1957 USA Ch Open 58th – Round 8 – Shipman, Walter – 1-0 – Garais, I – G53
1. c4 Nf6 2. Nf3 b6 3. d4 e6 4. Bg5 Bb4+ 5. Nc3 Bb7 6. e3 c5 7. Be2 cxd4 8. exd4 h6 9. Bd2 d5 10. Qa4+ Nc6
1960 Asztalos Memorial 3rd – Round 11 – Damjanovic, Mato – 0-1 – Kluger, Gyula – G21
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 b6 5. Bg5 Bb7 6. a3 Bxc3+ 7. bxc3 h6 8. Bh4 d6 9. e3 Nbd7 10. a4 a5
1960 It Bad Salzungen GER – Round 3 – Drozd, Ryszard – 1/2-1/2 – Bertholdt, Dieter – G10
1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb4 5. Bg5 Bb7 6. e3 O-O 7. Bd3 d5 8. cxd5 exd5 9. O-O Nbd7 10. Qc2 Be7
1960 Leningrad tt – Round 1 – Langeweg, Kick – 1-0 – Kvist, Goesta – G4
1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb7 5. Bg5 Bb4 6. e3 O-O 7. Bd3 d5 8. cxd5 exd5 9. O-O Nbd7 10. Ne5 Be7
1962 Bucharest ROM – Round 9 – Popov, Luben – 1-0 – Dunkelblum, Arthur – G24
1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb7 5. Bg5 Bb4 6. e3 O-O 7. Bd3 c5 8. O-O h6 9. Bh4 cxd4 10. exd4 Be7
1963 Capablanca Memorial – Round 18 – Haro Garcia, Gilberto – 1-0 – De Greif, Boris – G167
1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb7 5. Bg5 Bb4 6. a3 Bxc3+ 7. bxc3 h6 8. Bh4 g5 9. Bg3 Ne4 10. Nd2 Nxg3
1963 Spartak CC – Round ? – Zaitsev, Alexander – 1-0 – Zhukhovitsky, Samuel – G6
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 b6 5. Bg5 Bb7 6. e3 Bxc3+ 7. bxc3 d6 8. Nd2 Nbd7 9. f3 Qe7 10. Bd3 h6
1965 Pardubice – Round 5 – Pithart, Frantisek – 1-0 – Blatny, Frantisek – G46
1. Nf3 Nf6 2. c4 b6 3. d4 e6 4. Nc3 Bb7 5. Bg5 Bb4 6. Rc1 h6 7. Bd2 O-O 8. e3 d6 9. Be2 Nbd7 10. O-O Bxc3
1966 CSR Ch Int 1st – Round 12 – Malich, Burkhard, Dr. – 1/2-1/2 – Augustin, Josef – G66
1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb7 5. Bg5 Bb4 6. Qc2 O-O 7. e3 d6 8. Bd3 Bxc3+ 9. Qxc3 Nbd7 10. O-O-O h6
1969 Mar del Plata zt – Round ? – Garcia Toledo, Pedro – 1/2-1/2 – Schweber, Samuel – G56
1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb7 5. Bg5 Bb4 6. Qc2 h6 7. Bxf6 Qxf6 8. a3 Bxc3+ 9. bxc3 d6 10. e3 O-O
22. ECU Club Cup 2006 – Round 7 – Khenkin, Igor – 1/2-1/2 – Wegerle, Joerg – G171
1. d4 e6 2. c4 Nf6 3. Nf3 b6 4. Nc3 Bb4 5. Bg5 Bb7 6. Nd2 c5 7. d5 Bxc3 8. bxc3 h6 9. Bh4 Qe7 10. Qc2 d6
36. Olympiad 2004 – Round 3 – Jobava, Baadur – 1-0 – Zhang, Zhong – G85
1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Bg5 Bb7 5. Nc3 Bb4 6. Nd2 c5 7. d5 h6 8. Bh4 exd5 9. cxd5 Qe7 10. Qc2 O-O
43. Olympiad 2018 – Round 6.22 – Mareco, Sandro – 1-0 – Priasmoro, Novendra – G385
1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb4 5. Bg5 Bb7 6. Nd2 Nc6 7. a3 Bxc3 8. bxc3 h6 9. Bh4 d6 10. e3 g5
FIDE World Rapid Championship 2014 – Round 14.17 – Moiseenko, Alexander – 1/2-1/2 – Efimenko, Zahar – G71
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 b6 5. Bg5 Bb7 6. e3 c5 7. Bd3 cxd4 8. exd4 O-O 9. O-O Be7 10. Re1 d6
GMA 2004 – Round 10 – Van Wely, Loek – 0-1 – Bologan, Victor – G61
1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb7 5. Bg5 Bb4 6. Qb3 c5 7. a3 Bxc3+ 8. Qxc3 h6 9. Bh4 g5 10. Bg3 Ne4
Linares 1993 – Round 11 – Kamsky, Gata – 1-0 – Ivanchuk, Vasyl – G42
1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb4 5. Bg5 Bb7 6. e3 Bxc3+ 7. bxc3 d6 8. Nd2 Nbd7 9. f3 Qe7 10. e4 h6
Olympiad 2002 – Round 10 – Sokolov , Ivan – 1/2-1/2 – Mchedlishvili, Mikheil – G330
1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb4 5. Bg5 Bb7 6. Qb3 c5 7. a3 Ba5 8. dxc5 Na6 9. c6 Bxc6 10. Qc2 Bxc3+
Olympiad 2002 – Round 4 – Bacrot, Etienne – 1/2-1/2 – Korchnoi, Viktor – G106
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 b6 5. Bg5 Bb7 6. e3 c5 7. dxc5 bxc5 8. Qc2 Qa5 9. Bd3 d6 10. O-O Bxc3
Roquebrune rapid 1992 – Round 16 – Speelman, Jon S – 1-0 – Adams, Michael – G54
1. Nf3 Nf6 2. c4 b6 3. Nc3 Bb7 4. d4 e6 5. Bg5 Bb4 6. Qb3 c5 7. O-O-O Nc6 8. d5 Na5 9. Qc2 Bxc3 10. Qxc3 O-O
World Blitz 2015 – Round 3.3 – Riazantsev, Alexander – 1/2-1/2 – Grischuk, Alexander – G160
1. d4 e6 2. c4 b6 3. Nf3 Bb7 4. Nc3 Bb4 5. Bg5 Nf6 6. Qc2 h6 7. Bd2 O-O 8. a3 Bxc3 9. Bxc3 d6 10. Nd2 d5

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