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Up Topic The Rybka Lounge / Test Positions / Move c4 is the best move here. It is fairly hard to find it
- - By user923005 (****) [us] Date 2015-09-23 06:10
r1bqkb1r/ppp3pp/n3pn2/1N1p1p2/3P1B2/4P3/PPP2PPP/R2QKBNR w KQkq - acd 38; acs 3191; bm c4; cce 158; ce 46;
pm c4 {33} Nf3 {10} a3 {4} a4 {1}; pv c4 Bb4+ Nc3 c5 a3 Bxc3+ bxc3 O-O Nf3 Bd7 Ne5 cxd4 exd4 Nb8 c5 Nc6 Nxc6 Bxc6 Bd3 b6 cxb6 axb6 O-O Ne4 Qe2 Re8 Qb2 b5 Rfb1 h6 Qc1 Re7 Qe1 Nd6 Bxd6 Qxd6 Bxb5 Bxb5 Rxb5 Rxa3 Rxa3; white_wins 28; black_wins 12; draws 5;
Parent - - By Peter Grayson (****) [gb] Date 2015-09-23 10:39
Fritz 5.32 finds 6.c4 and sticks with it but other engines I tried preferred 6.Nf3. Despite White seemingly getting the better of it, for this opening there is a scarcity of games at the higher levels. I have included a compendium of the games that I could find, the last being in 2010.

Peter

[Event "ROM-chT"]
[Site "Romania"]
[Date "1992.??.??"]
[Round "?"]
[White "Golod, Vitali"]
[Black "Cosma, Ioan"]
[Result "1-0"]
[ECO "A80"]
[WhiteElo "2300"]
[BlackElo "2375"]
[Annotator "Various sources"]
[PlyCount "59"]
[EventDate "1992.??.??"]
[EventType ""]
[EventRounds "9"]
[EventCountry "ROM"]
[Source "ChessBase"]
[SourceDate "1996.11.15"]

1. d4 f5 2. Nc3 d5 3. Bf4 Nf6 4. e3 e6 5. Nb5 Na6 6. c4 ({Fritz 5.32:} 6. c4
Bb4+ 7. Nc3 c5 8. a3 Ba5 9. Qb3 dxc4 10. Qb5+ Bd7 {[%eval 22,15]}) 6... Bb4+ (
6... Be7 7. Nf3 O-O 8. a3 Ne4 9. Qc2 (9. Bd3 c6 10. Nc3 g5 11. Be5 Qe8 12. cxd5
cxd5 13. Qb3 Bd7 14. O-O Bc6 15. Rfc1 g4 16. Ne1 Nxc3 17. Bxa6 bxa6 18. Rxc3
Qd7 19. Qc2 Rac8 20. Rc1 Bb7 21. Bc7 Bd6 22. Nd3 Bxc7 23. Rxc7 Rxc7 24. Qxc7
Rf7 25. Qb8+ Rf8 26. Qxa7 Qb5 27. Rc3 f4 28. exf4 e5 29. dxe5 Qa4 30. b3 Qa5
31. Qc5 Qd8 32. Qc7 d4 33. Qxd8 Rxd8 34. Rc1 Be4 35. Nc5 Bd5 36. b4 a5 37. Rd1
axb4 38. axb4 Bc4 39. h3 Be2 40. Rd2 d3 41. hxg4 Rd4 {1-0 Astrom,R (2460)-Berg,
E (2390)/Ronneby 1998/EXT 1999}) 9... c5 10. Bd3 Qa5+ 11. Ke2 Bd7 12. Nc3 cxd4
13. exd4 dxc4 14. Bxe4 fxe4 15. Qxe4 Bc6 16. Qxe6+ Kh8 17. Be5 Bf6 18. Qxc4
Bxf3+ 19. gxf3 Bxe5 20. dxe5 Qxe5+ 21. Qe4 Qf6 22. Kf1 Nc5 23. Qe3 Rae8 24.
Qxc5 Qxf3 25. Rg1 Qd3+ 26. Kg2 Qf3+ 27. Kf1 Qd3+ 28. Kg2 Rf5 29. Rge1 Qf3+ 30.
Kg1 Ref8 31. Qe3 Qh5 32. Ne4 {1-0 Vaisser,A (2580)-Koch,J (2500)/Hilversum
1993/CBM 039}) (6... c6 7. Nc3 dxc4 (7... Bd6 8. Bxd6 Qxd6 9. Nf3 O-O 10. c5
Qc7 11. Bxa6 bxa6 12. Ne2 Rb8 13. O-O Rxb2 14. Nf4 a5 15. Ne5 g5 16. Nfd3 Rb8
17. h4 Ba6 18. hxg5 Ng4 19. Nf3 f4 20. exf4 Bxd3 21. Qxd3 Rxf4 22. g3 Rf5 23.
Qe2 e5 24. Nxe5 Nxe5 25. dxe5 Qxe5 26. Qxe5 Rxe5 27. f4 Re3 28. Kg2 Rc3 29.
Rae1 Rxc5 30. Re7 Rd8 31. Rh1 d4 32. Rexh7 Rf8 33. Rd7 Rc2+ 34. Kf3 c5 35. Rhh7
Re8 36. Kg4 Rxa2 37. Kf5 Rae2 38. g6 a4 39. Kf6 R2e6+ 40. Kg5 Re2 41. f5 {1-0
Hillarp Persson,T (2549)-Tozer,R (2317)/Copenhagen 2000/CBM 077 ext}) (7... Be7
8. Nf3 O-O 9. a3 (9. Be2 Nc7 10. O-O Nce8 11. Ne5 Nd6 12. Qc2 Bd7 13. Rab1 Be8
14. h3 Nf7 15. b4 Nxe5 16. Bxe5 Rc8 17. a4 g5 18. b5 Bg6 19. bxc6 bxc6 20. c5
Nd7 21. f4 Nxe5 22. fxe5 Rc7 23. Bd3 Qc8 24. a5 Bd8 25. a6 Rg7 26. Ne2 h5 27.
g3 Bh7 28. g4 hxg4 29. hxg4 f4 30. Bxh7+ Rxh7 31. Rb7 Rff7 32. exf4 gxf4 33.
Rxf7 Rxf7 34. Qg6+ Rg7 35. Qe8+ Kh7 36. Qh5+ Kg8 37. Nxf4 Bg5 38. Ng6 Be3+ 39.
Kg2 Rh7 40. Rf8+ Qxf8 41. Qxh7+ Kxh7 42. Nxf8+ Kh6 43. Nxe6 Kg6 44. Kf3 Bg1 45.
Nf4+ {1-0 Savchenko,S (2565)-Gvetadze,S (2361)/Harkany 2008/CBM 127 Extra})
9... Nc7 10. Be2 Nce8 11. O-O Bd7 12. Qb3 b6 13. Rac1 Nd6 14. Ne5 Nf7 15. cxd5
cxd5 16. Nxd7 Qxd7 17. Bb5 Qd8 18. Bc6 Rc8 19. Bb7 Rc4 20. Ba6 g5 21. Be5 b5
22. Bxb5 Rc8 23. Qa4 Bd6 24. Bxd6 Nxd6 25. Ba6 Rb8 26. b4 Qb6 27. Ne2 Nfe4 28.
Rc6 Qd8 29. Rfc1 f4 30. exf4 gxf4 31. f3 Qh4 32. Rf1 Ng3 33. Rxd6 Nxf1 34. Kxf1
Rf6 35. Qd7 Qh6 36. Qxa7 Rbf8 37. Bd3 Qxh2 38. Rd7 Rh6 39. Rg7+ Kh8 40. Rf7 Rg8
41. Nxf4 Rh3 42. Nxh3 Qh1+ 43. Ke2 Rxg2+ 44. Nf2 {1-0 Berg,K (2418)-Boe Olsen,
M (2389)/Nyborg 2001/CBM 083}) 8. Bxc4 b5 9. Bb3 b4 10. Na4 Bd6 11. Bxd6 Qxd6
12. Nf3 O-O 13. O-O Ne4 14. Rc1 Rf6 15. Ne5 Bb7 16. f3 Ng5 17. Nc5 Nxc5 18.
Rxc5 Rh6 19. Qe1 Nf7 20. Qxb4 Ba6 21. Rfc1 Nxe5 22. dxe5 Qd3 23. Qd4 Qxd4 24.
exd4 Bb7 25. R1c4 Rd8 26. Ra4 a6 27. Rb4 Rd7 28. g3 Kf7 29. Ba4 f4 30. Bxc6
Bxc6 31. Rxc6 a5 32. Rbc4 fxg3 33. hxg3 Rd5 34. R6c5 {1-0 Law,A (2328)-Zeidler,
S (2222)/England 1999/EXT 2000}) (6... dxc4 7. Bxc4 Nd5 8. Ne2 c6 9. Nbc3 Nac7
10. Be5 Nf6 11. Nf4 Ncd5 12. Nh5 Kf7 13. Nxf6 gxf6 14. Qh5+ Kg7 15. Bxd5 cxd5
16. Bf4 Rg8 17. h3 Bd7 18. g4 Be8 19. Qh4 Bg6 20. g5 Be7 21. gxf6+ Bxf6 22. Qg3
Kh8 23. Be5 Bh5 24. Qf4 Rg6 25. Kd2 Qf8 26. Rac1 Qb4 27. Bxf6+ Rxf6 28. Qg5 {
1-0 Wu,W (2570)-Zhao,X (2440)/Suzhou 2001/EXT 2002}) (6... Ne4 7. Nc3 (7. f3
Bb4+ 8. Ke2 Nd6 9. Nxd6+ Bxd6 10. Bxd6 Qxd6 11. c5 Qe7 12. f4 O-O 13. Kf2 Nb8
14. Nf3 Bd7 15. Ne5 Nc6 16. Nxd7 Qxd7 17. Bb5 a6 18. Ba4 b5 19. cxb6 cxb6 20.
Bxc6 Qxc6 21. Rc1 Qb7 22. Qb3 Rac8 23. Qb4 Kf7 {1/2-1/2 Riediger,M (2275)
-Poettinger,H (2222)/Austria 2002/EXT 2004}) 7... Nxc3 8. bxc3 c6 9. Bd3 Qa5
10. Ne2 Be7 11. O-O O-O 12. a4 Nc7 13. Qc2 Ne8 14. Rab1 Qd8 15. cxd5 exd5 16.
c4 dxc4 17. Bxc4+ Kh8 18. Be5 Nd6 19. Ba2 Bf6 20. Nf4 Qe7 21. Nd3 Nf7 22. f4
Nd8 23. a5 Qa3 24. Bc4 Bxe5 25. Ra1 Qe7 26. Nxe5 Rf6 27. Rfb1 Be6 28. Rb3 Rc8
29. Bxe6 Qxe6 30. Rc3 Kg8 31. Rd1 Qe7 32. d5 Rd6 33. a6 b5 34. dxc6 b4 35. Rxd6
Qxd6 36. c7 {1-0 Ortega,L (2487)-Genocchio,D (2278)/Estensi 2001/CBM 082 ext})
7. Nc3 O-O (7... c5 8. Bd3 (8. Nf3 Ne4 9. Rc1 Qa5 10. Qb3 b5 11. cxb5 c4 12.
Qc2 Nc7 13. Nd2 Nxc3 14. bxc3 Ba3 15. Bxc7 Qxc7 16. Rb1 Bd7 17. Nf3 Bd6 18. Be2
O-O 19. a4 Rfb8 20. Ne5 Bxe5 21. dxe5 a6 22. f4 axb5 23. axb5 Bxb5 24. Qd2 Ba4
25. O-O Rxb1 26. Rxb1 Bb3 27. Bf3 Qc5 28. Qd4 Qxd4 29. exd4 Ra2 30. g4 g6 31.
gxf5 gxf5 32. Re1 Rd2 33. Re3 Bc2 34. Be2 Be4 35. Kf2 Bd3 36. Ke1 Rc2 37. Bxd3
cxd3 38. h3 Rxc3 39. Kd2 Rc2+ 40. Kxd3 Ra2 41. Re1 Ra3+ 42. Ke2 Rxh3 43. Rb1
Kf7 44. Rb7+ Ke8 45. Ra7 Rh6 46. Kf3 Kf8 47. Ra8+ Kf7 48. Ra7+ Ke8 49. Rb7 Kd8
50. Ra7 Rh4 51. Ra8+ Kc7 52. Ra6 Rh3+ 53. Kg2 Rh6 54. Kf3 Kc8 55. Ra7 Kd8 {1/
2-1/2 Rozum,I (2480)-Bulanov,D (2379)/Peterhof 2010/CBM 137 Extra}) 8... Qa5 9.
Nge2 cxd4 10. exd4 dxc4 11. Bxc4 Nd5 12. O-O O-O 13. Qb3 Nac7 14. Bxc7 Nxc7 15.
Nf4 Kh8 16. Rae1 Re8 17. Re5 Qb6 18. Nb5 Bd6 19. Rxf5 Nxb5 20. Rxb5 Qxd4 21.
Nxe6 Bxe6 22. Bxe6 b6 23. Rd5 Qb4 24. Qh3 Bc5 25. Rh5 Rxe6 26. Rxh7+ Kg8 27.
Rh8+ Kf7 28. Rxa8 Rf6 29. Rxa7+ Kg8 30. Qb3+ Qxb3 31. axb3 Re6 32. Ra4 Re2 33.
b4 Bd4 34. b5 Bc5 35. b4 Bd4 36. g3 Re5 37. Kg2 {1-0 Manninen,M (2380)
-Lindstedt,J (2325)/Finland 1993/EXT 1998}) (7... Ne4 8. Qc2 (8. Nge2 c5 9. a3
Ba5 10. f3 Nd6 11. cxd5 cxd4 12. Qxd4 O-O 13. dxe6 Nb5 14. Qxd8 Rxd8 15. e7 Re8
16. b4 Nxb4 17. axb4 Bxb4 18. O-O-O Nxc3 19. Nxc3 Be6 20. Nd5 Bxe7 21. Nc7 Ba3+
22. Kb1 Rac8 23. Nxe8 Bb3 24. Nd6 Rc6 25. Bc4+ {1-0 Lalic,B (2491)-Vancini,E
(2282)/Bratto 2005/CBM 108 ext}) 8... c6 9. Bd3 Bd6 10. Bxd6 Nxd6 11. Qb3 Qa5
12. cxd5 exd5 13. Nf3 Be6 14. O-O Nb8 15. Na4 Nd7 16. Rac1 O-O 17. Nc5 Nxc5 18.
dxc5 Ne4 19. Bxe4 fxe4 20. Nd4 Bc8 21. f4 exf3 22. Nxf3 Qc7 23. Nd4 Bd7 24. e4
Qe5 25. Nf3 Qxe4 26. Qxb7 Qe3+ 27. Kh1 Bg4 28. Qxc6 Bxf3 29. gxf3 Rad8 30. Rce1
Qd2 31. Qe6+ Kh8 32. Re2 Qb4 33. c6 Rf6 34. c7 {1-0 Meleghegyi,C (2400)
-Karacsony,A (2235)/Hungary 1996/EXT 2000}) 8. Bd3 (8. a3 Bxc3+ 9. bxc3 c5 10.
Bd3 (10. Nf3 Qa5 11. Qb3 Bd7 12. Bd3 b5 13. cxb5 c4 14. Qb2 cxd3 15. bxa6 Ne4
16. Qb4 Qxa6 17. O-O Ba4 18. Qb2 Rac8 19. Rac1 Rf7 {0-1 Dishman,S (2300)-Wall,
G (2305)/England 1997/EXT 1999}) 10... Qa5 11. Ne2 Bd7 12. O-O dxc4 13. Bxc4 b5
14. Ba2 c4 15. a4 bxa4 16. Bxc4 Nd5 17. Bb3 Nb6 18. Be5 Qb5 19. Ba2 Nc4 20. Rb1
Qc6 21. Bg3 Rfc8 22. Nf4 Nc7 23. Rb4 Nb6 24. c4 Kh8 25. Nd3 Qe4 26. Ne5 Bc6 27.
Nxc6 Qxc6 28. Bxc7 Rxc7 29. Qf3 a3 30. Ra1 Rac8 31. c5 Nd5 32. Bxd5 Qxd5 33.
Qxd5 exd5 34. Rxa3 Re8 35. h4 Kg8 36. g3 Kf7 37. Kg2 Kf6 38. Ra6+ Re6 39. Rba4
h6 {1-0 Shtyrenkov,V (2450)-Krouzel,J (2240)/Pardubice 1996/CBM 055 ext}) (8.
Nf3 Ne4 9. Qb3 c6 10. Bd3 Qa5 11. Rc1 Be7 12. h4 Nb4 13. Be2 Qb6 14. O-O Qd8
15. g3 h6 16. h5 Na6 17. Nxe4 fxe4 18. Ne5 Nb8 19. Ng6 Rf7 20. Bg4 Na6 21. Rc2
Nb4 22. Ne5 Nxc2 23. Nxf7 Kxf7 24. Qxc2 Bf6 25. f3 exf3 26. Qg6+ Ke7 27. Be5
Qf8 28. c5 Bxe5 29. dxe5 Bd7 30. Rxf3 Qg8 31. Rf4 Rf8 32. Kf2 Be8 33. Qc2 g6
34. hxg6 Qxg6 35. Qxg6 Rxf4+ 36. exf4 Bxg6 37. Ke3 Kf7 38. Bd1 Bb1 39. a4 Kg6
40. b4 h5 41. b5 Ba2 42. Bc2+ Kf7 43. b6 a5 44. f5 exf5 45. Bxf5 Bc4 46. Bc8
Ba6 47. Kd4 Ke7 48. e6 Kf6 49. Bd7 Bc4 50. Bxc6 Kxe6 51. Bxb7 Bb3 52. c6 Bxa4
53. c7 Bd7 54. c8=Q Bxc8 55. Bxc8+ Kd6 56. b7 Kc7 57. Kxd5 a4 58. Kc4 {1-0
Reiss,T (2255)-Antal,G (2339)/Paks 2000/EXT 2004}) 8... dxc4 (8... c6 9. a3 Bd6
10. Nge2 Nc7 11. O-O dxc4 12. Bxc4 Ncd5 13. Bxd5 exd5 14. h3 Ne4 15. Bxd6 Qxd6
16. f3 Nf6 17. Qd2 b6 18. Nf4 Ba6 19. Rfe1 Rae8 20. b4 Bc4 21. Nd3 Nd7 22. Nf2
Qg3 23. Nh1 Qh4 24. Qf2 Qh6 25. Ng3 Qg5 26. Nf1 Bxf1 27. Kxf1 Re6 28. Re2 Nf6
29. Kg1 Rfe8 30. Rae1 Nh5 31. Kh2 Qe7 32. g4 fxg4 33. hxg4 Nf6 34. Kg2 a5 35.
Na2 h5 36. g5 Ne4 37. fxe4 Rxe4 38. Qf5 Rf8 39. Qg6 Rg4+ 40. Kh1 Rxg5 41. Qc2
Rf3 42. Rg2 Rh3+ 43. Kg1 Rxg2+ 44. Qxg2 Qh4 45. Kf1 Rh1+ {0-1 Suran,J (2300)
-Sluka,R (2320)/Usti nad Labem 1996/Juniors}) 9. Bxc4 Nd5 10. Nge2 Nxf4 11.
Nxf4 Qe7 12. Qb3 Re8 13. O-O c6 14. Bxa6 bxa6 15. Nd3 Bd6 16. Na4 Kh8 17. f4 g5
18. Ne5 gxf4 19. exf4 c5 20. Nxc5 Bxc5 21. dxc5 Qxc5+ 22. Kh1 a5 23. Rac1 Qb4
24. Qh3 Qb7 25. Qc3 Qg7 26. Rf3 Rf8 27. Qd4 Ba6 28. Rc7 Qxc7 29. Nf7+ Kg8 30.
Nh6# 1-0
Parent - By user923005 (****) [us] Date 2015-09-23 11:32
Statistically, c4 performs better in my database.  It takes Stockfish a very long time to find it, but when it does find it it sticks to it.  Not a convincing centipawn evaluation though.
Up Topic The Rybka Lounge / Test Positions / Move c4 is the best move here. It is fairly hard to find it

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