patzer2: Here's my look at the game and the Friday puzzle (44. ?) with the chessgames.com Opening Explorer (OE) and Deep Fritz 14:<1. Nf3 Nf6 2. g3 d5 3. Bg2 c6 4. c4 Bg4> This move, transposing into the English Caro-Kahn (A11), is just fine, but I prefer 4... dxc4 as in
R Forster vs Bacrot, 2015.
<5. O-O e6 6. h3> This is the only game with this move in the OE. Most often played is 6. d3 as in R Mamedov vs Dvoirys, 2015.
<6... Bxf3 7. Bxf3 Nbd7 8. cxd5 exd5 9. d3 Nc5 10. Nc3 Be7 11. e4 dxe4 12. dxe4 O-O 13. Be3 Ne6 14. Qxd8 Rfxd8 15. Rad1 Nd7 16. Bg4 Ne5 17. Be2 Bc5 18. Bxc5 Nxc5 19. f4 Ned3 20. Bxd3 Nxd3 21. Rd2 Rd7 22. Rfd1 Rad8 23. Kf1 Nc5 24. Rxd7 Rxd7 25. Rxd7 Nxd7 26. Ke2 h5 27. Ke3 Kf8 28. Kd4 Ke7 29. b4 g6 30. Nd1 f5 31. e5 Nf8 32. h4 Ne6+
33. Kd3 c5 34. b5 Nd4 35. a4 b6 36. Ne3 Ne6 37. Nc4 Nc7 38. Ne3 Kd7 39. Kc4 Ke6 40. a5!> This strong move gives White a slight advantage and sets a trap for Black.
<40...Kd7> If 40... bxa5??, White wins with 41. Kxc5
(+1.89 @ 26 depth).
<41. Nd1! Ke6?> This is the decisive mistake. Black moves to the right square (e6) but with the wrong piece, and with 41...Ke6? falls into the trap White set with 40. a4!
Instead, Black can hold with 41... Ne6! (moving the Knight and not the King to e6), when Fritz indicates play might continue 42. Nc3 bxa5 43. Kb3 Nc7 44. Ka4 Kc8 45. Kxa5 Kb7 46. Na4 Ne6 47. Nb2 Nc7 48. Nd3 Ne6 49. Ka4 c4 50. Ne1 Kb6 51. Kb4 c3 52. Nc2 Nc7 53. Ne3 Nxb5 54. Nd5+ Kc6 55.
Nxc3 Nd4 56. Kc4 Nf3 57. Nb5 Nd2+ 58. Kd3 Ne4 59. Nxa7+ Kd7 = (+0.26 @ 26 depth).
<42. Nc3! Kd7 43. Na4! Na8> Here 42. Nc3! initiates the winning combination, for which our Friday puzzle solution (44. ?) is merely a follow-up.
If 43... bxa5, then White wins with 44. Nxc5+
(+2.04 @ 25 depth).
<44. Nxc5+> This follow-up to 41...Ke6? 42. Nc3!
solves today's Friday puzzle. In my attempt to solve the puzzle I found this move, but missed a key follow-up three moves later.
<44...bxc5>
If 44... Kc7, then White wins with 45. Nb3 bxa5 46. Nxa5 Nb6+ 47. Kc5
(+9.15 @ 23 depth).
<45. Kxc5 Nc7 46. b6 Ne6+>
If 46... axb6+, then White wins with 47. Kxb6! (Not 47. axb6? Ne6+ 48. Kb5 Nd8 49. Ka6 Kc8 50. Ka7 Nc6+ 51. Ka8 Kd7 52. Kb7 Nd8+ =) 47... Kc8 48. a6
(+11.31 @ 21 depth).
<47. Kb5!> This is an essential follow-up which, in my attempt to solve the puzzle, I missed.
My planned follow-up was 47. Kd5?, which Fritz indicates fizzles out to a draw after 47...axb6 48. axb6 Nd8 49. Kc5 Ke6 50. Kb5 Kd5 51. Ka6 Kc6 52. Ka7 Kd7 53. b7 Nc6+ 54. Kb6 Nb8 =.
<47... axb6 48. Kxb6!>
If 48...a6?, Fritz indicates White holds after 48...Kc7 49. a7 Kb7 50. a8=Q+ Kxa8 51. Kxb6 g5 52. fxg5 Kb8 53. Kc6 Kc8 54. Kd6 f4 55. gxf4 Nxf4 56. Ke7 Nd5+ 57. Kf7 Kd8 58. Kg6 Ke7 59. Kxh5 Ke6 = (0.00 @ 37 depth).
<48...g5 49. a6> This wins, but also strong is 49. hxg5
(+18.90 @ 22 depth).
<49...gxh4 50. a7 hxg3 51. a8=Q h4 52.
Qd5+ 1-0>
Black resigns as White will soon mate, as for example after 52.Qd5+ Ke7 53. Qd6+ Kf7 54. Qd7+ Kg6 55. Qxe6+ Kg7 56. Qf6+ Kh7 57. Qxh4+ Kg7 58.
Qxg3+ Kf8 59. Qg6 Ke7 60. Kc7 Kf8 61. e6 Ke7 62. Qf7#.