patzer2: Here's my look at the game and puzzle position (28. ?) with the chessgames.com Opening Explorer and Fritz:<10...Qc7> I was surprised to find the Opening Explorer indicates this is most popular move at master level.
Another popular alternative that seems to give Black good play is 10... Nf6 = to
.
An interesting example of play in this line is the game Kamsky vs Karpov, 1993, when Black won after 10...Nf6 11. Qh4 Ke7!?
Another example of the potential for 10...Nf6 is Black's win in Adams vs Speelman, 1995.
<11. O-O b6 12. Qg4 Kf8 (Not 12... O-O?? 13. Bxh6
) 13. b3 Bb7 14. Bb2 Nf6 15. Qh3 Nd5 16. g3 Nb4>
A good alternative is 16... c5 as in Black's win in Yifan Hou vs Qun Ma, 2014.
<17. dxc5 Bxc5 18. Ne5 Kg8 19. Rad1 Rd8) 17. Be4 f5 18. Ng5! Qe7 19. Nxe6+!>
This positional sacrifice of a piece for two pawns is where the game gets really interesting.
<19...Qxe6 20. Bxf5 Qf7 21. Rae1 Re8 22. Re6 Rxe6 23. Bxe6 Qf6?> This seems to be the losing move, as Black's game rapidly goes down hill after White's reply.
Fritz indicates Black can put up more resistance with 23... Qe7, but White holds the advantage after 24. d5 Ke8 25. dxc6 Bxc6 26. Be5 h5 27. Qf5 Bxe5 28. Qxe5 Qf6 29. Qb8+
when play might continue 29...Qd8 30. Qxa7 Qe7 31. Qxb6 Qxe6 32. Qxb4 Qd5 33. Re1+ Kd7 34. Qe7+ Kc8 35. Qe6+ Qxe6 36. Rxe6 Bf3
.
<24. Bc8! Ba8> Black can put up more resistance with 24...Qe7, but is still lost after 25. Bxb7! Qxb7
26. Re1! Be7 27. c4! Bd8 28. a3 Na2 29. Qe6 Qe7 30. Qf5+ Qf7 31. Qc8
.
<25. Re1 Nd5 26. Re6 Qd8 27. Qf5+ Nf6 28. d5!> This clever move solves our Friday puzzle.
If 28...Qxc8, then White wins the Black Queen and the game after 29. Rxf6+! Ke7 30. Rf7+ Kd8 31. Bf6+! gxf6 32. Qxf6+ Ke8 33. Qxh8+ Kxf7 34. Qxc8
.
<29. Rxf6+ gxf6 30. Be6+ Kg7 31. Qg4+ Kf8>
If 31... Kh7, then 32. Bf5#
<32. Qg6 Qe7>
If 32... Qe8, then 33. Qxf6+ Qf7 34.
Qxf7#
<33. Bxf6 Qh7 34. Qg4 cxd5>
If 34... h5, then 35. Qf3 Rg8 36. Bh4+ Ke8 37. dxc6 Rf8 38. c7! Qxc7 39. Qxa8+ Qb8 40. Qc6#.
<35. Bxh8 1-0> Black resigns in lieu of
<35...Qxh8>
If 35... Bc5, then White wins with 36. Qf4+! Ke7 (36... Ke8 37. Qb8+ Ke7 38. Qxa7+ Kxe6 39. Qxh7
) 37. Qf6+ Ke8 38. Bg7 Be7 39. Qf7+ Kd8 40. Qf4 Ke8 41. Qa4+ Kd8 42. Qd7#.
If 35... Ke8, then White wins with 36. Bf5! Qxh8 37. Qg6+ Ke7 38. Qe6+ Kf8 39. Qxd6+ Kf7 40. Qd7+ Kf8 41. Qd8+ Kg7 (41... Kf7 42. Qxh8
)42. Qe7+ Kg8 43. Be6#.
<36. Qf5+ Kg7>
If 36... Ke7, then 37. Qf7+ Kd8 38. Qd7#
If 36... Ke8, then 37. Qf7+ Kd8 38. Qd7#
<37. Qf7#>