D11k — Slav: Breyer Variation

1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nbd2 * ● Trait aux Noirs

Ouverture — Centre fermé

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Avantages : case forte e5, paire de fous.
Faiblesses adverses : Bc8 enfermé, Bf8 enfermé, roi noir au centre.
Problèmes : roi au centre, Bc1 enfermé, Bf1 enfermé, 4 pièces non développées (C1, F1, A1, H1).
Plans :
● O-O — Mettre le roi en sécurité, connecter les tours
● e4 — Centre d4+e4, menace e5, libère Bf1
● Bg5 — Clouer Nf6
● h3 — Empêcher ...Bg4

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Avantages : case forte e4, case forte g4, paire de fous.
Faiblesses adverses : Bc1 enfermé, Bf1 enfermé, roi blanc au centre.
Problèmes : roi au centre, Bc8 enfermé, Bf8 enfermé, 5 pièces non développées (B8, C8, F8, A8, H8).
Plans :
● O-O — Mettre le roi en sécurité, connecter les tours
● ...Nbd7 — Développer Nb8
● ...Bg4 — Développer Bc8, clouer Nf3
● ...Bd6 — Développer Bf8
● ...c5 — Rupture

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

D11k — Breyer Variation

1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nbd2

Eval: [+0.05]

Les coups candidats

4…Bf5 — 54.5% (1639 parties)

Ambassadeurs : Ipatov, Alexander (15x), Kalavannan, Koby (13x), Can, Ecrin Azra (9x), Reich, Thomas (8x), Rivas Maceda, Juan (8x), Injac, Teodora (8x), Lampert, Jonas (8x), Peric, Slavisa (8x)

4…e6 — 19.7% (593 parties)

Ambassadeurs : Injac, Teodora (5x), Drabek, Miloslav (4x), Teske, Henrik (3x), Gadimbayli, Abdulla (3x), Zakhartsov, Vladimir (3x), Zalys, Ignas (2x), Laketic, Gojko (2x), Young, Angelo (2x)

4…g6 — 16.4% (492 parties)

Ambassadeurs : Mamedyarov, Shakhriyar (8x), Ipatov, Alexander (5x), Stahlberg, Gideon (4x), Tu, Hoang Thong (4x), Socko, Bartosz (4x), Osnos, Viatcheslav (3x), Sandler, Leonid (3x), Skoulakis, Charalambos (3x)

4…a6 — 3.5% (105 parties)

Ambassadeurs : Tournier, Mathieu (2x), Botsari, Anna-Maria (2x), Tu, Hoang Thong (2x), De Filomeno, Simone (2x), Vogt, Andreas, Prof. Dr. (1x), Pieper-Emden, Carsten (1x), Charnushevich, Aliaksei (1x), Malakhov, Vladimir (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	4…Bf5	4…e6	4…g6	4…a6
<1800	58	43%	36%	7%	—
1800-2200	1067	50%	25%	12%	4%
2200-2600	1558	59%	16%	18%	4%
2600+	55	60%	—	40%	—

Évolution par décennie (% des parties)

Décennie	N parties	4…Bf5	4…e6	4…g6	4…a6
1920s	7	57%	43%	—	—
1930s	18	56%	17%	22%	—
1940s	8	38%	12%	50%	—
1950s	18	33%	11%	33%	—
1960s	21	33%	14%	48%	—
1970s	20	40%	25%	30%	—
1980s	32	44%	19%	28%	3%
1990s	192	49%	22%	17%	1%
2000s	538	51%	22%	15%	5%
2010s	1644	56%	19%	16%	4%
2020s	507	60%	20%	13%	3%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
4…Bf5	56%	60%	▲ +4.6%
4…e6	19%	20%	▲ +1.5%
4…g6	16%	13%	▼ -3.5%
4…a6	4%	3%	▼ -0.6%

Joueurs célèbres

Champions du monde dans cette position

Botvinnik, Mikhail — 1 partie
Smyslov, Vladimir — 1 partie
Carlsen, Magnus — 1 partie

Parties historiques

4…Bf5 — 54.5% (1639 parties)

1924 — Gruber, Sebastian vs Muller, Hans — 0-1 — Gyor
1925 — Mueller, Hans vs Wolf, Siegfried — 0-1 — Vienna AUT
1925 — Speijer, Abraham vs Van Hoorn, Peter — 0-1 — NED
1927 — Sergeev, Alexander vs Geiler, E. — 0-1 — Moscow RUS
1931 — Lichtenstein, Bernhard vs Lokvenc, Josef — 0-1 — Vienna AUT

4…e6 — 19.7% (593 parties)

1923 — Lasker, Edward vs Kupchik, Abraham — 1-0 — Lake Hopatcong
1925 — Duran Reca, Mateo vs Lynch, Julio — 1-0 — Buenos Aires ARG
1927 — Davidson Gallego, Jorge vs Olland, Adolf George — 0-1 — Utrecht NED
1931 — Abata Molina, Santiago Andres vs Piazzini, Luis — 0-1 — Argentina
1933 — Luckis, Marcos vs Voisin, Andreleon — 1-0 — Folkestone olm

4…g6 — 16.4% (492 parties)

1937 — Stahlberg, Gideon vs Steiner, Lajos — 1-0 — Sopot
1938 — Stahlberg, Gideon vs Tartakower, Savielly — 1/2-1/2 — Lodz POL
1938 — Stahlberg, Gideon vs Larsson, Ernst — 1-0 — Orebro SWE
1939 — Stahlberg, Gideon vs Gershman, Solomon — 1/2-1/2 — Buenos Aires ARG
1944 — Luckis, Marcos vs Liebstein, Arturo — 0-1 — Mar del Plata ARG

4…a6 — 3.5% (105 parties)

1984 — Vogt, Andreas, Prof. Dr. vs Pieper-Emden, Carsten — 1/2-1/2 — Bad Oeynhausen GER
1999 — Charnushevich, Aliaksei vs Malakhov, Vladimir — 1-0 — Lvov UKR
2001 — Tu, Hoang Thai vs Nguyen, Thanh Son — 0-1 — Can Tho
2004 — Benkovic, Petar vs Kurmann, Oliver — 1-0 — Zurich SUI
2004 — Verat, Laurent vs Nguyen, Thanh-Tong — 1/2-1/2 — Paris FRA

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

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● e5 (2v0)	● e4 (2v1), ● g4 (2v0)
Cases faibles	—	—
Centre	● d4 (1v0), ● e5 (2v0)	● d5 (3v1), ● e4 (2v1)

Colonnes et diagonales

♔ Blancs

♚ Noirs

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 0)
Bf1	● Bf1 Non développé (mob. 0)
Bc8		● Bc8 Non développé (mob. 5)
Bf8		● Bf8 Non développé (mob. 0)
Paire de fous	● Oui	● Oui
Non développées	4 (c1, f1, a1, h1)	5 (b8, 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	fermé
Ruptures	● c4-c5	● …c6-c5, ● …e7-e6, ● …e7-e5

Partie
19. European Teams 2013 – Round 3.7 – Fridman, Daniel – 1-0 – Nigalidze, Gaioz – G121 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 Bf5 5. Nh4 Bg6 6. Qb3 Qb6 7. Qh3 Nbd7 8. Nxg6 fxg6 9. e3 c5 10. dxc5 Nxc5
1925 Vienna – Round 5 – Mueller, Hans – 0-1 – Wolf, Siegfried – G10 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 Bf5 5. e3 e6 6. Be2 Nbd7 7. O-O Bd6 8. c5 Bc7 9. b4 Ne4 10. Bb2 a6
1931 Argentina – Round 17 – Abata Molina, Santiago Andres – 0-1 – Piazzini, Luis – G55 1. Nf3 d5 2. d4 Nf6 3. c4 c6 4. Nbd2 e6 5. g3 Nbd7 6. Bg2 Bd6 7. O-O O-O 8. b3 b6 9. Bb2 Bb7 10. h3 Ne4
1931 Trebitsch mem14 – Round 12 – Lichtenstein, Bernhard – 0-1 – Lokvenc, Josef – G36 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 Bf5 5. Qb3 Qb6 6. e3 e6 7. c5 Qc7 8. Nh4 Nbd7 9. Nxf5 exf5 10. Bd3 g6
1932 Bad Sliac – Round 1 – Opocensky, Karel – 1/2-1/2 – Spielmann, Rudolf – G6 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 Bf5 5. cxd5 cxd5 6. Ne5 e6 7. Qb3 Qb6 8. Qxb6 axb6 9. e3 Bd6 10. Bb5+ Ke7
1935 Warsaw olm – Round 11 – Luckis, Marcos – 1-0 – Czerniak, Magdalena – G38 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 Bf5 5. Qb3 Qc7 6. e3 e6 7. Bd3 Nbd7 8. Bxf5 exf5 9. Qc2 g6 10. cxd5 Nxd5
1936 Margate Premier Reserves A – Round 7 – Van Seters, Frits – 1-0 – Illingworth, Leonard – G7 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 Bf5 5. g3 e6 6. Bg2 Be7 7. O-O Ne4 8. Nxe4 Bxe4 9. b3 O-O 10. Bb2 dxc4
1937 Parnu – Round 6 – Opocensky, Karel – 0-1 – Schmidt, Pascal – G18 1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. Nbd2 Bf5 5. Nh4 Be6 6. e3 g6 7. Qb3 Qc8 8. Nhf3 Bg7 9. Bd3 O-O 10. Qa3 Nbd7
1938 Lodz – Round 1 – Stahlberg, Gideon – 1/2-1/2 – Tartakower, Savielly – G9 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 g6 5. e3 Bg7 6. Be2 Nbd7 7. O-O O-O 8. b3 c5 9. Bb2 cxd4 10. exd4 Nb8
1939 Buenos Aires Circulo – Round 1 – Stahlberg, Gideon – 1/2-1/2 – Gershman, Solomon – G43 1. Nf3 Nf6 2. c4 c6 3. d4 d5 4. Nbd2 g6 5. e3 Bg7 6. Be2 O-O 7. b3 Ne4 8. Bb2 Qa5 9. a3 Nc3 10. Bxc3 Qxc3
1947 Schlechter Memorial – Round ? – Gereben, Erno – 1/2-1/2 – Kottnauer, Cenek – G56 1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. Nbd2 Bf5 5. g3 e6 6. Bg2 Nbd7 7. O-O Bd6 8. b3 Qe7 9. Bb2 O-O 10. h3 Ne4
1949 URS Ch, semi final – Round 9 – Novotelnov, Nikolai – 1/2-1/2 – Ebralidze, Alexandre – G70 1. c4 c6 2. d4 Nf6 3. Nf3 d5 4. Nbd2 g6 5. e3 Bg7 6. Be2 O-O 7. O-O b6 8. b4 c5 9. bxc5 bxc5 10. Ba3 cxd4
1950 Venice – Round 8 – Szabados, Eugenio – 0-1 – Letelier Martner, Rene – G69 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 c5 5. cxd5 cxd4 6. Qa4+ Qd7 7. Qxd4 Qxd5 8. e4 Qxd4 9. Nxd4 a6 10. e5 Nd5
1952 Tampa US Open – Round 8 – Zalys, Ignas – 1/2-1/2 – Sharp, C. – G8 1. d4 Nf6 2. c4 c6 3. Nf3 d5 4. Nbd2 Nbd7 5. g3 e6 6. Bg2 Bb4 7. O-O O-O 8. a3 Bd6 9. e4 dxe4 10. Ng5 Bc7
1953 POL-ch11 – Round 5 – Kwapisz, Stanislaw – 0-1 – Makarczyk, Kazimierz – G29 1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. Nbd2 g6 5. e3 Bg7 6. Bd3 O-O 7. b3 c5 8. Bb2 Nbd7 9. O-O b6 10. cxd5 Nxd5
1954 Munich zt – Round 7 – Bouwmeester, Hans – 1/2-1/2 – Wade, Robert G – G43 1. d4 Nf6 2. c4 c6 3. Nf3 d5 4. Nbd2 g6 5. g3 Bg7 6. Bg2 O-O 7. b3 c5 8. Bb2 cxd4 9. O-O dxc4 10. Nxc4 Be6
1956 Budapest Alekhine – Round 1 – Sandor, Bela – 1/2-1/2 – Gereben, Erno – G52 1. Nf3 d5 2. d4 c6 3. c4 Nf6 4. Nbd2 Bf5 5. g3 e6 6. Bg2 Nbd7 7. O-O Be7 8. Nh4 Bg4 9. cxd5 cxd5 10. h3 Bh5
1963 Budapest Ch – Round 1 – Barczay, Laszlo – 0-1 – Cs. Kovacs, Laszlo – G11 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 Bf5 5. e3 e6 6. Be2 h6 7. O-O Nbd7 8. b3 Bd6 9. Bb2 O-O 10. Ne5 Qc7
1965 FRG Ch – Round 10 – Troeger, Paul – 1/2-1/2 – Hodakowsky, Georg – G25 1. d4 Nf6 2. Nf3 d5 3. c4 c6 4. Nbd2 Bf5 5. Qb3 Qc7 6. e3 h6 7. Bd3 Bxd3 8. Qxd3 e6 9. O-O Be7 10. b3 O-O
1967 DDR Ch 16th – Round 15 – Golz, Werner – 1/2-1/2 – Malich, Burkhard, Dr. – G80 1. Nf3 d5 2. d4 Nf6 3. c4 c6 4. Nbd2 g6 5. e3 Bg7 6. Be2 O-O 7. O-O Nbd7 8. b3 b6 9. Ba3 Bb7 10. Rc1 Re8
1967 FRA Ch 42nd – Round 8 – Thiellement, Andre – 0-1 – Cormier, Kristian – G9 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 g6 5. e3 Bg7 6. Be2 O-O 7. O-O Bg4 8. h3 Bxf3 9. Bxf3 e6 10. cxd5 cxd5
1967 Moscow RUS – Round ? – Taimanov, Mark E – 0-1 – Botvinnik, Mikhail – G35 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 g6 5. e3 Bg7 6. Be2 O-O 7. O-O b6 8. b4 Bb7 9. Bb2 Ne4 10. Nxe4 dxe4
1967 October Revolution 50 – Round 1 – Szabo, Ladislav – 1-0 – Fuchs, Raimond – G74 1. Nf3 Nf6 2. c4 c6 3. d4 d5 4. Nbd2 Bf5 5. Nh4 Be6 6. e3 g6 7. Bd3 Bg7 8. O-O O-O 9. Nhf3 dxc4 10. Nxc4 c5
1967 POL Team Ch 20th – Round 8 – Doda, Zbigniew – 1-0 – Borchardt, Adam – G50 1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. Nbd2 Bf5 5. Nh4 Bg6 6. g3 e6 7. Bg2 Qb6 8. Nxg6 hxg6 9. e3 Nbd7 10. O-O dxc4
1968 Hoogovens – Round 1 – Doda, Zbigniew – 1-0 – Crabbendam, Hans – G11 1. d4 Nf6 2. Nf3 d5 3. c4 c6 4. Nbd2 Qa5 5. e3 g6 6. Be2 Bg7 7. O-O O-O 8. a3 Nbd7 9. b4 Qd8 10. Bb2 Nb6
2. Sinquefield Cup 2014 – Round 5.1 – Nakamura, Hikaru – 0-1 – Caruana, Fabiano – G13 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 Bf5 5. Nh4 Be4 6. f3 Bg6 7. e3 e6 8. g3 Be7 9. a3 Nbd7 10. cxd5 cxd5
63. ch-USA 2019 – Round 10.6 – Gareyev, Timur – 1-0 – Robson, Ray – G60 1. Nf3 d5 2. d4 Nf6 3. c4 c6 4. Nbd2 Bf5 5. Nh4 Be4 6. Qb3 Qb6 7. f3 Qxb3 8. Nxb3 Bc2 9. Bd2 h6 10. g4 e6
84. Tata Steel Masters 2022 – Round 2.4 – Rapport, Richard – 1-0 – Van Foreest, Jorden – G11 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 Bf5 5. Nh4 Be6 6. e3 g6 7. b3 Bg7 8. Bb2 O-O 9. Rc1 Ne4 10. Nhf3 Qa5
FIDE Candidates 2014 – Round 1.4 – Mamedyarov, Shakhriyar – 1/2-1/2 – Topalov, Veselin – G4 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 g6 5. e3 Bg7 6. Bd3 c5 7. dxc5 Na6 8. Nb3 dxc4 9. Bxc4 Qxd1+ 10. Kxd1 Ne4
FIDE World Blitz Championship 2014 – Round 10.4 – Mamedyarov, Shakhriyar – 1-0 – Wang, Hao(ZJWZ) – G85 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 g6 5. b3 Bg7 6. Bb2 O-O 7. e3 Bf5 8. Be2 Nbd7 9. h3 h6 10. O-O Ne4
FIDE World Blitz Championship 2014 – Round 14.19 – Ipatov, Alexander – 1/2-1/2 – Fressinet, Laurent – G124 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 Bf5 5. Nh4 Be4 6. f3 Bg6 7. Qb3 Qb6 8. cxd5 cxd5 9. Nxg6 hxg6 10. Qxb6 axb6
FIDE World Blitz Championship 2014 – Round 7.11 – Mamedyarov, Shakhriyar – 1-0 – Potkin, Vladimir – G53 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 Bf5 5. Nh4 Be6 6. e3 g6 7. Qb3 Qc7 8. Nhf3 Bg7 9. cxd5 cxd5 10. Bb5+ Nc6
FIDE World Rapid 2014 – Round 2.8 – Harikrishna, Pentala – 1-0 – Najer, Evgeniy – G13 1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. Nbd2 g6 5. e3 Bg7 6. Be2 O-O 7. O-O dxc4 8. Nxc4 c5 9. dxc5 Ne4 10. Qc2 Nxc5
FIDE World Rapid 2014 – Round 6.27 – Mamedyarov, Shakhriyar – 0-1 – Najer, Evgeniy – G67 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 g6 5. b3 Bg7 6. Bb2 Ne4 7. e3 Bg4 8. Be2 Nxd2 9. Nxd2 Bxe2 10. Qxe2 O-O
FIDE World Rapid 2014 – Round 7.4 – Carlsen, Magnus – 1/2-1/2 – Fressinet, Laurent – G121 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 Bf5 5. Nh4 Be4 6. Qb3 Qb6 7. e3 e6 8. Be2 h6 9. Nxe4 dxe4 10. g3 c5
SportAccord Basque Men 2013 – Round 1.1 – Mamedyarov, Shakhriyar – 1-0 – Le, Quang Liem – G6 1. Nf3 d5 2. d4 Nf6 3. c4 c6 4. Nbd2 Bf5 5. Nh4 Be6 6. e3 g6 7. Qb3 Qc7 8. Qc2 Bg7 9. cxd5 Nxd5 10. Nb3 O-O
SportAccord Blindfold Men 2012 – Round 6.7 – Giri, Anish – 1-0 – Fressinet, Laurent – G47 1. Nf3 d5 2. d4 Nf6 3. c4 c6 4. Nbd2 Bf5 5. Nh4 Be4 6. e3 e6 7. Be2 Nbd7 8. O-O Bd6 9. g3 Qe7 10. a3 g5
SportAccord Blitz 2014 – Round 19.4 – Mamedyarov, Shakhriyar – 1-0 – Gelfand, Boris – G147 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 g6 5. e3 Bg7 6. Bd3 c5 7. cxd5 Nxd5 8. O-O cxd4 9. exd4 O-O 10. h3 Nc6
SportAccord Blitz Men 2013 – Round 1.8 – Mamedyarov, Shakhriyar – 1-0 – Wang, Yue(SH) – G8 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 g6 5. e3 Bg7 6. Bd3 O-O 7. O-O Bg4 8. b3 e6 9. h3 Bxf3 10. Qxf3 Nbd7
SportAccord Blitz Men 2013 – Round 23.5 – Mamedyarov, Shakhriyar – 0-1 – Ponomariov, Ruslan – G178 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 g6 5. e3 Bg7 6. Bd3 O-O 7. O-O a6 8. b4 Bg4 9. a4 e6 10. Ba3 Re8
SportAccord Blitz Men 2013 – Round 9.4 – Mamedyarov, Shakhriyar – 1-0 – Wang, Hao(ZJWZ) – G65 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 g6 5. e3 Bg7 6. Bd3 O-O 7. O-O b6 8. b4 a5 9. b5 cxb5 10. cxb5 Bb7
World Blitz 2015 – Round 4.57 – Edouard, Romain – 1-0 – Naumann, Alexander – G257 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 Bf5 5. Qb3 Qc7 6. g3 e6 7. Bg2 Nbd7 8. Nh4 Bg6 9. Nxg6 hxg6 10. O-O Be7
World Blitz 2015 – Round 9.31 – Mamedyarov, Shakhriyar – 1-0 – Schneider, Ilja – G549 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 Bf5 5. Nh4 Be6 6. e3 g6 7. Nhf3 Bg7 8. b3 O-O 9. Bb2 Bf5 10. Be2 Ne4
World Blitz 2018 – Round 19.30 – Vallejo Pons, Francisco – 1-0 – Al-Sayed, Mohammed – G1121 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 Bf5 5. Nh4 Bd7 6. e3 g6 7. b3 Bg7 8. Bb2 O-O 9. Be2 Ne4 10. Nhf3 Nxd2

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