D48b — Semi-Slav: Meran, 8…a6 9.a4

1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 a6 9.a4 * ● Trait aux Noirs

Ouverture — Centre semi-ouvert

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Avantages : majorité centre (2v1), case forte d4, case forte e4, case forte e5, Bd3 actif, paire de fous, colonne c.
Faiblesses adverses : arriéré c6, Bc8 enfermé, Bf8 enfermé, roi noir au centre.
Problèmes : roi au centre, Bc1 enfermé, arriéré b2, 3 pièces non développées (C1, A1, H1).
Plans :
● O-O — Mettre le roi en sécurité, connecter les tours
● Bd2 — Développer Bc1
● h3 — Empêcher ...Bg4
● Rc — Tour sur colonne c

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Avantages : majorité aile_dame (3v2), case forte d5, avant-poste d5(C), paire de fous, colonne d.
Faiblesses adverses : arriéré b2, Bc1 enfermé, roi blanc au centre.
Problèmes : roi au centre, Bc8 enfermé, Bf8 enfermé, arriéré c6, 4 pièces non développées (C8, F8, A8, H8).
Plans :
● O-O — Mettre le roi en sécurité, connecter les tours
● ...Bg4 — PRIORITÉ: libérer le Bc8 (...Bg4, ...Bf5)
● ...Be7 — Développer Bf8
● ...c5 — Rupture
● ...e5 — Rupture

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

D48b — Meran

1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 a6 9.a4

Eval: [-0.05]

Les coups candidats

9…b4 — 65.9% (546 parties)

Ambassadeurs : Andersen, Erik (6x), Pech, Jaroslav Jr (4x), Pinter, Jozsef (4x), Mochalin, Faddey (4x), Habes, Jiri (4x), Malakhatko, Vadim (4x), Koltanowski, George (3x), Levenfish, Grigory (3x)

9…Bb7 — 33.8% (280 parties)

Ambassadeurs : Tunik, Gennady (5x), Winter, William (3x), Cimicki, Dariusz (3x), Istomin, Aleksandr Vasilievich (3x), Koltanowski, George (2x), Michell, Reginald (2x), Eltsov, Andrey (2x), Karasev, Vladimir I (2x)

9…Nb6 — 0.1% (1 parties)

Ambassadeurs : Hughes, William (1x), Heller, Wayne (1x)

9…Bb4 — 0.1% (1 parties)

Ambassadeurs : Sartori, Delfino (1x), Evangelisti, Massimo (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	9…b4	9…Bb7	9…Nb6	9…Bb4
<1800	24	46%	50%	—	4%
1800-2200	256	64%	36%	—	—
2200-2600	379	67%	33%	—	—
2600+	17	41%	59%	—	—

Évolution par décennie (% des parties)

Décennie	N parties	9…b4	9…Bb7	9…Nb6	9…Bb4
1920s	8	50%	50%	—	—
1930s	29	83%	17%	—	—
1940s	20	75%	25%	—	—
1950s	10	80%	20%	—	—
1960s	9	89%	11%	—	—
1970s	7	57%	43%	—	—
1980s	31	71%	29%	—	—
1990s	58	71%	28%	2%	—
2000s	268	72%	28%	—	—
2010s	348	59%	40%	—	0%
2020s	40	48%	52%	—	—

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
9…b4	59%	48%	▼ -12.0%
9…Bb7	40%	52%	▲ +12.3%
9…Nb6	0%	0%	+0.0%
9…Bb4	0%	0%	-0.3%

Joueurs célèbres

Champions du monde dans cette position

Carlsen, Magnus — 1 partie

Parties historiques

9…b4 — 65.9% (546 parties)

1927 — Vajda, Arpad vs Asztalos, Lajos — 1-0 — London ENG
1928 — Brody, Miklos vs Voellmy, Erwin — 1-0 — The Hague NED
1929 — Koltanowski, George vs Engelmann, Marcel — 1-0 — Ghent
1929 — Van den Bosch, Johannes vs Wertheim, Johan Hendrik — 1-0 — The Hague NED
1930 — Andersen Zargham, Ellene vs Makarczyk, Kazimierz — 1-0 — Hamburg GER

9…Bb7 — 33.8% (280 parties)

1925 — Vidmar Milan vs Michell, Reginald — 1-0 — Hastings ENG
1926 — Vidmar, Milan Sr vs Michell, Reginald — 1-0 — Hastings Town Hall
1929 — Koltanowski, George vs Winter, William — 1-0 — Ramsgate
1929 — Koltanowski, George vs Winter, William — 1-0 — Ramsgate
1930 — Ahues, Carl vs Winter, William — 1-0 — Scarborough ENG

9…Nb6 — 0.1% (1 parties)

1995 — Hughes, William vs Heller, Wayne — 0-1 — ?

9…Bb4 — 0.1% (1 parties)

2017 — Sartori, Delfino vs Evangelisti, Massimo — 1-0 — ICCF

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	● b2	● c6
Chaînes	● f2→e3, e3→d4	● a6→b5, c6→b5, f7→e6
Passés	—	—
Majorité	● centre 2v1	● aile_dame 3v2

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● d4 (2v0), ● e4 (2v1), ● e5 (2v1)	● d5 (3v1)
Cases faibles	—	—
Centre	● d4 (2v0), ● e4 (2v1), ● e5 (2v1)	● d5 (3v1)

Colonnes et diagonales

	♔ Blancs	♚ Noirs
Semi-ouvertes	● c	● d

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 1)
Bd3	● Bd3 Actif (mob. 10)
Bc8		● Bc8 Non développé (mob. 1)
Bf8		● Bf8 Non développé (mob. 5)
Paire de fous	● Oui	● Oui
Non développées	3 (c1, a1, h1)	4 (c8, f8, 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, ● e3-e4	● …c6-c5, ● …e6-e5

Partie
1925 Hastings – Round 1 – Vidmar Milan – 1-0 – Michell, Reginald – G2 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 Bb7 10. O-O Be7
1927 London Olympiad 1st – Round 1.23 – Vajda, Arpad – 1-0 – Asztalos, Lajos – G2 1. Nf3 d5 2. c4 e6 3. d4 Nf6 4. Nc3 Nbd7 5. e3 c6 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 c5
1928 The Hague ol (Men) – Round 12 – Brody, Miklos – 1-0 – Voellmy, Erwin – G76 1. c4 Nf6 2. d4 e6 3. Nf3 d5 4. e3 Nbd7 5. Nc3 c6 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 c5
1929 Ramsgate schev – Round 5 – Koltanowski, George – 1-0 – Winter, William – G24 1. d4 d5 2. c4 e6 3. Nc3 c6 4. e3 Nf6 5. Bd3 Nbd7 6. Nf3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 Bb7 10. Qc2 Rc8
1930 Hamburg olm – Round 11.3 – Andersen Zargham, Ellene – 1-0 – Makarczyk, Kazimierz – G32 1. d4 d5 2. Nf3 Nf6 3. c4 e6 4. Nc3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 Bb7
1930 Scarborough – Round 10 – Ahues, Carl – 1-0 – Winter, William – G51 1. d4 d5 2. c4 c6 3. e3 Nf6 4. Nc3 e6 5. Bd3 Nbd7 6. Nf3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 Bb7 10. Qe2 b4
1930 Swinemuende – Round 2 – Andersen, Erik – 1-0 – Stahlberg, Gideon – G4 1. d4 d5 2. Nf3 Nf6 3. c4 e6 4. Nc3 Nbd7 5. e3 c6 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 Bb7
1930 Swinemuende – Round 4 – Andersen, Erik – 1-0 – Koch, Berthold – G13 1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. Nf3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 Bb7
1931 Bled – Round 1 – Maroczy, Geza – 1/2-1/2 – Pirc, Vasja – G76 1. d4 Nf6 2. Nf3 d5 3. c4 c6 4. Nc3 e6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 Bb7 10. O-O Be7
1931 Prague CSR – Round 4 – Van den Bosch, Johannes – 1/2-1/2 – Makarczyk, Kazimierz – G14 1. d4 d5 2. c4 e6 3. Nf3 c6 4. Nc3 Nf6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 Bb7
1932 Bad Sliac – Round 1 – Flohr, Salo – 1/2-1/2 – Vidmar, Marjeta – G9 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 c5
1932 Bad Sliac – Round 1 – Opocensky, Karel – 1/2-1/2 – Pokorny, Alois – G37 1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. Nf3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 c5
1932 Bad Sliac – Round 1 – Vidmar, Marjeta – 1/2-1/2 – Pirc, Vasja – G5 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 e6 5. Nc3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 c5
1933 Mnichovo ch CZE – Round 8 – Gonzalez May, Daniel Francisco – 1-0 – Treybal, Karel – G10 1. Nf3 Nf6 2. d4 d5 3. c4 e6 4. Nc3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 Bb7 10. O-O b4
1933 Moravska Ostrava – Round ? – Herzog, Franz – 0-1 – Pirc, Vasja – G13 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 c5
1934 Copenhagen – Round 1 – Andersen, Erik – 0-1 – Ruben, Carl – G4 1. d4 d5 2. Nf3 c6 3. e3 Nf6 4. c4 e6 5. Nc3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 c5
1934 Syracuse – Round 1 – Reshevsky, Samuel – 1/2-1/2 – Kashdan, Isaac – G7 1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. Nf3 c6 5. e3 a6 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 Nbd7 9. a4 b4 10. Ne4 c5
1935 Bad Nauheim – Round 1 – Andersen, Erik – 1/2-1/2 – Bogoljubow, Efim – G3 1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. e3 e6 5. Nc3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 c5
1935 Buenos Aires – Round 1 – Vinuesa, Juan – 0-1 – Villegas, Benito – G3 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 Bb7
1936 Bad Nauheim – Round 1 – Ahues, Carl – 1-0 – Bogoljubow, Efim – G4 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Nb1 c5
1938 URS Ch, semi final – Round 1 – Makogonov, Mikhail – 1/2-1/2 – Yudovich, Mikhail M – G11 1. d4 Nf6 2. c4 c6 3. Nf3 d5 4. Nc3 e6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 c5
1941 Munchen – Round 3 – Opocensky, Karel – 0-1 – Rethy, Pal – G31 1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. Nc3 Nbd7 5. e3 c6 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 Bb7 10. O-O b4
1944 Moskou ch-URS – Round 1 – Tolush, Alexander – 1-0 – Veresov, Gavriil – G106 1. Nf3 Nf6 2. c4 c6 3. e3 d5 4. Nc3 e6 5. d4 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 Bb7 10. O-O b4
1946 Pittsburgh Open – Round 1 – Kupchik, Abraham – 1-0 – Westbrock, J. – G5 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 e6 5. Nc3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 a5
1946 Zagreb ch YUG – Round 14 – Vidmar, Milan Jr – 1/2-1/2 – Rabar, Braslav – G20 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 c5
1947 GER Ch 11th – Round 11 – Ernst, Wilhelm – 0-1 – Nuernberg, Friedrich – G16 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Nb1 c5
1947 Nt – Round 11 – Hoenlinger, Baldur – 0-1 – Rellstab, Ludwig – G29 1. d4 e6 2. c4 Nf6 3. Nf3 d5 4. Nc3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 c5
1948 GBR Ch 35th – Round 4 – Ritson-Morry, William – 1/2-1/2 – Alexander, Conol Hugh – G12 1. d4 d5 2. c4 e6 3. Nc3 c6 4. e3 Nf6 5. Nf3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 Bb7 10. O-O b4
1948 JUG Ch – Round 17 – Nedeljkovic, Srecko M – 0-1 – Trifunovic, Petar – G71 1. d4 d5 2. Nf3 e6 3. c4 Nf6 4. Nc3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 Be7
1949 Leningrad – Round 11 – Levenfish, Grigory – 1-0 – Zagorovsky, Vladimir – G78 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 c5
1949 Moskou ch-URS – Round 1 – Levenfish, Grigory – 0-1 – Geller, Efim P – G29 1. d4 d5 2. c4 e6 3. Nc3 c6 4. e3 Nf6 5. Nf3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 Bb7
1949 Moskou ch-URS – Round 1 – Taimanov, Mark E – 1/2-1/2 – Bronstein, David I – G33 1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. Nc3 e6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 Bb7
1949 URS-ch17 – Round ? – Levenfish, Grigory – 0-1 – Geller, Efim P – G8 1. d4 d5 2. c4 e6 3. Nc3 c6 4. e3 Nf6 5. Nf3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 Bb7
1952 POL-ch10 – Round 9 – Tarnowski, Alfred – 0-1 – Makarczyk, Kazimierz – G61 1. d4 d5 2. Nf3 Nf6 3. c4 e6 4. Nc3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 c5
1953 Kbenhavnsmesterskabet – Round 7 – Fich, Johannes – 0-1 – Blom, Kaj – G10 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 Bb7
1958 Munich olm prel – Round 8 – Reshevsky, Samuel – 1/2-1/2 – Pomar Salamanca, Arturo – G174 1. c4 c6 2. Nf3 d5 3. d4 Nf6 4. Nc3 e6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 Bb7 10. O-O b4
1958 YUG Ch sf – Round 6 – Udovcic, Mijo – 1-0 – Ciric, Dragoljub M – G17 1. d4 d5 2. c4 e6 3. Nc3 c6 4. e3 Nf6 5. Nf3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 c5
1959 Kragujevac ch14-YUG – Round 1 – Udovcic, Mijo – 1-0 – Ivkovic, Danijal – G28 1. d4 d5 2. c4 c6 3. Nf3 e6 4. Nc3 Nf6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 c5
1960 Leningrad ch-URS – Round 14 – Taimanov, Mark E – 1-0 – Sakharov, Yuri G. – G126 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 Bb7
1961 Dortmund – Round 1 – Udovic, Andraz – 1/2-1/2 – Abalde Perez, Fernando Jose – G2 1. c4 e6 2. Nf3 d5 3. d4 c6 4. Nc3 Nf6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Nb1 c5
1965 Hoogovens – Round 3 – Van Scheltinga, Theo – 1-0 – Johannessen, Simon T – G30 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 e6 5. Nc3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 c5
1966 Titovo Uzice – Round ? – Udovcic, Mijo – 1/2-1/2 – Jovcic, Milan – G100 1. d4 d5 2. c4 e6 3. Nc3 c6 4. Nf3 Nf6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 Bb7 10. O-O b4
1967 Hastings6768 – Round 2 – Hort, Vlastimil – 1-0 – Whiteley, Andrew Jonathan – G6 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Nf3 e6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 Bb7
63. ch-USA 2019 – Round 10.5 – Akobian, Varuzhan – 1/2-1/2 – Shankland, Sam – G59 1. d4 d5 2. c4 e6 3. Nc3 c6 4. e3 Nf6 5. Nf3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 Bb7 10. b3 b4
Hoogovens 1987 – Round 1 – Korchnoi, Viktor – 1-0 – Nogueiras Santiago, Jesus – G1 1. d4 d5 2. c4 e6 3. Nc3 c6 4. e3 Nf6 5. Nf3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 b4 10. Ne4 c5
XXVII SuperGM 2010 – Round 5 – Aronian, Levon – 1/2-1/2 – Gelfand, Boris – G12 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. a4 Bb7 10. b3 bxa4

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