patzer2: Here's my look at the game and today's Saturday (25...?) puzzle with the chessgames.com opening explorer (OE) and Deep Fritz 14:<1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nge2> The popular choice is 5.
Bd3 as in A Dale vs Wei Yi, 2015.
<5... d5 6. a3 Be7 7. cxd5 exd5 8. b4> This is the second most popular move.
Most often played is 8. g3 as in
Carlsen vs W So, 2015.
The Fritz preference is 8. Nf4 as in Tomashevsky vs Karjakin, 2013 or A Fier vs E Karavade, 2015.
<8...c6 9. Ng3 Be6> This appears to give Black a slight advantage.
Another good option for Black is the popular choice 9... Re8 as in A Smirnov vs Tomashevsky, 2009.
<10. Bd3 Nbd7> This was first
introduced in A Shimanov vs Wang Hao, 2011, and has been good for Black. There are four games with 10...Ndb7 in the OE, and Black won all four of them.
<11. O-O b5 12. Bd2> The game enters previously unexplored territory.
<12...Nb6 13. Nce2 g6 14. Nf4 Bd6 15. Bc2 Nc4 16. Bc3 Qc7 17. Nd3 Rae8 18. Nc5 Bg4 19. Qc1 h5 20. Re1 h4 21. Nf1 Ne4>
Fritz prefers 21...h3 even though it fizzles out to a
level game after 22. g3 a5 23. bxa5 Bxc5 24. dxc5 Nd7 25. Bd1 Bxd1 26. Qxd1
Nxc5 27. Qd4 Qe5 28. Qxc5 Qxc3 29. Qxc6 Qxa5 30. Reb1 Rd8 31. Qxb5 Qc3 =
(-0.14 @ 21 depth).
<22. Bxe4 dxe4 23. a4?> This slight mistake turns the game in Black's favor.
Instead, White can hold with 23. h3 when play might continue 23...Bh5 24. Nd2 Nxd2 25. Qxd2 Qe7 26. Rec1 Bc7 27. Na6 = (+0.29 @ 23 depth).
<23... Qe7 24. axb5 cxb5 25. Qb1?> This is the decisive error, allowing
Black's surpise winning reply.
Instead, White can maximize resistance and hold on with 25. Qc2 when play might continue 25...h3 26. Nxe4 Qxe4 27. Qxe4 Rxe4 28. f3 Bxf3 29. gxf3 Re7 30. e4 Rc8
(-0.60 @ 21 depth)
<25...Bf3!!> This strong move wins the game and solves our Saturday puzzle.
My attempted solution was 25... h3
(-0.51 @ 21 depth, Deep Fritz 14)
which gives Black a good game, but is not as strong as the game continuation.
Surprisingly, Fritz finds a win for Black after 25...h3 26. Qxe4 Qxe4 27. Nxe4 Rxe4 28. f3 Bxf3 29. gxf3 Re7 30. e4 Rc8 31. Kf2 Nb6 32. Re3 Bf4 33. Rd3 f5 34. Ng3 Rc4 35. Ne2 (35. exf5? Nd5 36. Ra3 gxf5?? 37. Nxf5 Rec7 38. Be1 Rc2+ 39. Kf1 Rxh2 40. Ng3 Rcc2 41. Kg1 Rcg2+ 42. Kf1 Bxg3 43. Bf2 Rxf2+ 44. Kg1 Rhg2+ 45. Kh1 Rf1#) 35... Bxh2 36. e5 Nd5 37. Rh1 Bf4 38. Rxh3 Rec7 39. Rh1 R4c6 40. Be1 Rc2 41. Kf1 Bc1 42. Nxc1 Rxc1 43. Rd2 R7c2 44. Rxc2 Rxc2 45. Rh3 Ne3+ 46. Kg1 Rg2+ 47. Kh1 Re2 48. Bh4 Nd5 49. f4 Re4 50. Bg5 a6 51. Ra3 Nxb4 52. Be7 Rxd4 53. Bxb4 Rxb4 54. Rxa6 Kg7
(
2.77 @ 27 depth).
<26. gxf3>
If 26. Ra2, Black wins after 26...Qg5! 27. Ng3 (27. g3? Qf5
) 27... hxg3 28. hxg3 Re7! 29. gxf3 exf3 30. Ne4 Qf5 31. Nd2 Qh5 32. Nxf3 (32. Qd3 Nxd2 33. Rxd2 f5 34. Qf1 Rh7
) 32... Qxf3
(-3.95 @ 20 depth).
<26... Qg5+ 27. Kh1 exf3 28. Ng3 hxg3 29. fxg3 f2 30. Re2 Bxc5>
This wins but even stronger is 30... Bxg3! which threatens 31. hxg3 Qh5+ 32. Kg2 Qxe2
.
<31. dxc5>
If 31. Rxf2, Black wins easy with 31...Qd5+ 32. Rg2 Bd6
.
<31... Rxe3 32. Rxe3 Qxe3 0-1>
White resigns due to the dual threat 33...Qf6# and 33...Qxc6
.