patzer2: Here's my look at the game and the Sunday puzzle (21. ?) with the chessgames.com opening explorer (OE) and Deep Fritz 14:<1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bc4 Qb6> With 917 games in the OE, this is the second most popuar move. The most popular move, with 1,575 games in the OE, is 6...e6 as in D Aldama Degurnay vs G Kacheishvili, 2014.
<7. Nb3> This prudent reply is the popular move and the Fritz first choice.
If 7. Be3?! Black's position is fine after taking the "not so
poisoned" pawn with 7... Qxb2 when play might continue 8. Ndb5 Qb4 9. Bd3 (9. Qe2 Nxe4 
) 9... Qa5 10. Rb1 e6 11. O-O Be7 12. Qd2 O-O 13. h3 a6 14. Nd4 Qc7 
(-0.60 2 20 depth, Deep Fritz 14).
<7... e6 8. Bg5> There are only 41 games in the OE with 8. Bg5. Black
won 44% and White won 29% of those games , and the last time 8. Bg5 was played in the OE data base was in 2012. So despite White's fine victory here (and the fact Fritz evaluates 8. Bg5 equal) it is a move that is seldom played.
The popular move and the Fritz first choice, with 246 games in the OE, is 8. O-O as in M Bartel vs A Jankovic, 2009.
<8... a6 9. O-O Be7> An interesting alternative is the Fritz favorite 9... Ne5 as in A Yegiazarian vs I Ivanisevic, 2000.
<10. Bxf6 gxf6 11. Qh5 Ne5> Here
the game enters unexplored territory, as this is the only game with this move in the OE.
<12. Be2 O-O> Here Fritz prefers 12... Bd7 13. a4 O-O-O 14. a5 Qc7 15. f4 Ng6 16. g3 Kb8 17. Rad1 Rhg8 18. Kh1 Bc6 = (+0.12 @ 20 depth, Deep Fritz 14).
<13. Kh1 Kh8 14. a4 Bd7 15. a5 Qc7 16. Nd2 Ng6 17. Nc4 Rad8 18. f4 d5?>
This is a mistake which gives White a clear advantage.
Black can hold it level with 18... Bc6 when play might continue 19. Rad1 d5 20. exd5 exd5 21. Ne3 Nxf4 22. Qh6 Nxe2 23. Rf3 Bd7 24. Rxd5 Rg8 25. Rh5 Rg7 26. Nxe2 f5 27. Rg3 Qe5 28. Nd5 Rdg8 29. Nxe7 Qxe7 30. Rxg7 Rxg7 31. Qd2 Bc6 = (0.00 @ 23 depth, Deep Fritz 14).
<19. exd5 Nxf4?> One mistake leads to another, as Black is very nearly lost after White's reply.
Instead, Black can make a fight of it with 19... f5 when play might continue 20. Qf3 Bc5 21. Rad1 Rg8 22. g3 f6 23. d6 Qb8 24. Qd3 e5 25. Nd5 Bxd6 26. Bf3 Bb5 27. Nxf6 Be7 28. Nd5 Bf8 29. Qe2 exf4 30. Nxf4 Bg7 31. Bd5 Rge8 32. Qh5 Nxf4 33. Rxf4 Qc7 34. b3 Re7 35. Qxf5 Bc6 36. Kg1 Bd7 37. Qh5 Be8 38. Qf3 Bg6 39. Qf2 Bh6 40. Rh4 Rf8 41. Qd4+ Bg7 42. Qd2 Rd8 43. Kg2 Qd7 44. Qg5 Qe8 45. Rd2 Re2+ 46. Kf3 Rxd2 47. Qxd2 Qd7 48. Nb6 Qf5+ 49. Kg2 Qe5 50. c4 Be4+ 
(+ 0.41 @ 22 depth, Deep Fritz 14).
<20. Qh6!> This strong move sets up our (21. ?) Sunday puzzle.
<20...Nxe2??> This loses quickly.
Black can put up more resistance with 20... exd5 when play might continue 21. Rxf4 dxc4 22. Rxc4 Qb8 23. Rh4 Bf5 24. Bd3 Rxd3 25. cxd3 Qd6 26. d4 Rc8 27. Qf4 Bg6 28. Qxd6 Bxd6 29. g3 f5 30. Kg2 Kg7 31. d5 f4 32. gxf4 Rc4 33. Ra4 Rxa4 34. Nxa4 Be4+ 35. Kg3 Bxd5 36. Nc5 f6 37. b4 
to 
(+1.30 @ 21 depth, Deep Fritz 14).
<21. d6! > (+7.38 @ 20 depth, Deep Fritz 14) This is the winning move which punishes 20...Nxe2?? and solves today's Sunday puzzle.
<21...Bxd6 22. Nxd6 Qxd6 23. Ne4 Qc7 24. Rf5!> This is by far the
strongest follow up, forcing mate-in-19 according to Fritz.
White can also win with the "obvious" 24. Nxf6 but it takes longer as White puts up more resistance after 24...Qxc2 25. Nxd7 Qg6 26. Qxg6 hxg6 27. Nxf8 Rxf8 when play might continue 28. Rad1 e5 29. Rd7 f5 30. Rxb7 Rd8 31. Rb6 Kg7 32. Rxa6 e4 33. Rb6 (+4.41 @20 depth, Deep Fritz 14).
<24... Rg8 25. Nxf6 Rg7 26. Rg5 1-0>
Black resigns in lieu of 26...Ng3+ 27. hxg3 Rdg8 28. Nxg8 Rxg5 29. Qxg5 h6 30. Nxh6 Kh7 31. Ng4 Qxc2 (31... Qd8 32. Qxd8 ) 32. Qh6+ Kg8 33. Nf6#.
Kibitzing
sac: 20.Qh6
