Black to play and win

Indiana State Chess Championship, Indianapolis Indiana
Qain, Bill (1744) vs. Coffey, John (2001)

1 2 3 4 5 6 7 8 h g f e d c b a 0

(black to move) 1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Qb6 6. Bd3 cxd4 7. cxd4 Bd7 8. Bc2 Nb4 9. Nc3 Nxc2+ 10. Qxc2 Rc8 11. Bd2 Qa6 12. Qb3 Ne7 13. Rc1 Nf5 14. Ne2 Rxc1+ 15. Nxc1 Be7 16. Bb4 O-O 17. Bxe7 Nxe7 18. Nd3 b6 19. Kd2 Bb5 20. a3 Bc4 21. Qc3 Rc8 22. Nb4 Qa4 23. Rc1 Kf8 24. Qc2 Bb3 25. Qxh7 Rxc1 26. Kxc1 a5 27. Qh8+ Ng8 28. Nd3 Qc4+ 29. Kd2 Bc2 30. Nfe1 Bxd3 31. Nxd3 Qxd4 32. Qh3 Ne7 33. Qe3 Nf5 34. Qxd4 Nxd4 35. Kc3 Nc6 36. f4 Ke7 37. b4 axb4+ 38. Nxb4 Nxb4 39. Kxb4 f6 40. g4 fxe5 41. fxe5 g5 42. Kb5 Kd7 43. Kb4 Kc6 44. a4 d4 45. Kc4 d3 46. Kxd3 Kd5 47. Kc3 Kxe5 48. Kb4 Kd6 49. Kb5 e5 50. Kxb6 e4 51. a5 e3 52. a6 e2 53. a7 e1=Q 54. a8=Q Qb4+ 55. Ka6 Qa4+ 56. Kb7 Qb5+ 57. Ka7 Kc7

[ Flip the board | Reset | Options… ] Play chess online

 

Options:
	- allow legal moves only;
	- use short algebraic notation;
movement/animation speed: (slow) (fast)
	- show legal moves;

 

Pawn promotion:
	- Queen
	- Rook
	- Bishop
	- Knight

What is the strongest line for White?

Live Chess, Chess.com
Analysis of john2001plus (1859) vs. pkengsoo (1547)

8 7 6 5 4 3 2 1 a b c d e f g h -4

(white to move) 1. Nf3 Nf6 2. d4 g6 3. c4 Bg7 4. Nc3 O-O 5. Bg5 d6 6. e3 Nbd7 7. Be2 h6 8. Bh4 e5 9. Qc2 Re8 10. O-O exd4 11. Nxd4 Ne5 12. Rad1 Bf5 13. Nxf5 gxf5 14. Qxf5 Ng6 15. Bg3 Nd7 16. Bh5 Nde5 17. b3 Ne7 18. Qc2 Qd7 19. Bxe5 Bxe5 20. h3 Qe6 21. Bg4 Qg6 22. Qxg6+ fxg6 23. Nb5 d5 24. cxd5 a6 25. Nd4 h5 26. Be6+ Kg7 27. f4 Bd6 28. Bd7 Nxd5 29. e4 Ne3 30. e5 Nxf1 31. exd6 Rh8 32. dxc7 Ng3 33. Ne6+ Kf6 34. Nc5 Ke7 35. Na4 Rac8 36. Bxc8 Rxc8 37. Nb6 Rxc7 38. Nd5+

[ Flip the board | Reset | Options… ] Play online chess

 

Options:
	- allow legal moves only;
	- use short algebraic notation;
movement/animation speed: (slow) (fast)
	- show legal moves;

 

Pawn promotion:
	- Queen
	- Rook
	- Bishop
	- Knight

White to play and win.

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Analysis of john2001plus (1866) vs. SpeedyChess11 (1747)

8 7 6 5 4 3 2 1 a b c d e f g h 0

(white to move) 1. Nf3 Nf6 2. d4 e6 3. c4 b6 4. a3 Bb7 5. Nc3 Be7 6. d5 exd5 7. cxd5 O-O 8. e4 d6 9. Bc4 Re8 10. O-O Nbd7 11. Nd4 Ne5 12. Bb5 Rf8 13. f4 Ng6 14. Bc6 Bxc6 15. Nxc6 Qd7 16. Be3 Ng4 17. Bd4 Bf6 18. h3 Bxd4+ 19. Qxd4 Nf6 20. e5 Ne8 21. Rae1 dxe5 22. fxe5 Ne7 23. Nxe7+ Qxe7 24. Qc4 Rd8 25. Nb5 Qc5+ 26. Qxc5 bxc5 27. Nxa7 Rxd5 28. Nc6 Rd2 29. a4 Rxb2 30. a5 g6 31. a6 Ng7 32. Rb1 Ra2 33. a7 Ne6 34. Ra1 Rxa1 35. Rxa1 Ra8 36. Rb1 Kg7 37. Rb8 Rxa7 38. Nxa7 c4 39. Rb4 c3 40. Rc4 CHECK!

[ Flip the board | Reset | Options… ] Play chess online

 

Options:
	- allow legal moves only;
	- use short algebraic notation;
movement/animation speed: (slow) (fast)
	- show legal moves;

 

Pawn promotion:
	- Queen
	- Rook
	- Bishop
	- Knight