|Jun-13-15|| ||Penguincw: Wow. When I first saw the puzzle, I thought a rook sac was to be played. I considered 27.Rxf6 exf6 28.Re7+ Kf8 29.Rxd7, but also 27.Rxe7+ Bxe7 28.d5+/28.Ne6+, but it wasn't really getting anywhere.|
Just before I clicked on the solution, I thought that maybe the first move was 28.d5 or 28.Ne6+, and got 28.d5, 29.Bxf6 (28...Bxc3 29.Rxe7+).
|Jun-13-15|| ||mike1: saw the first move d5 this time and could not (still cant) find a win after Kf7.|
|Jun-13-15|| ||lanfeust: Rh7,Cxd8 ;RxR ,d6xe7 ,et le pion va à Dame|
|Jun-13-15|| ||al wazir: I got a zero on this. What happens after 27...Rxc7 ? If 28. d6, then black seems to be all right after 28...Rxc3. If 28. Bxf6, then 28...Nxf6, and black is a ♘ up.|
|Jun-13-15|| ||diagonalley: nah.... i went for 27.RxB too but wasn't overly confident that it was the key move... particularly as the puzzle was categorised as "very difficult"... but... it looked/looks playable - (would be interested to know how an engine would score it). happy weekend all|
|Jun-13-15|| ||patfoley: 227...rxc7 28 Rxe7 Ke8 29 Rxf6 Kxe7 30 ed6ch etc or 29 ...Nf6 30 Rxc7|
|Jun-13-15|| ||agb2002: The material is identical.
Black threatens 27... Rxc7.
The bishop x-rays the black king and the rook on h8. This suggests 27.d5:
A) 27... Rxc7 28.Rxe7+
A.1) 28... Kf8 29.Bxf6 Rc1+ (29... Nxf6 30.Rxc7 followed by 31.Rxf6 wins) 30.Re1 Rxe1+ 31.Kxe1 Nxf6 32.Rxf6+ Kg7 33.Rd6 with an extra pawn and a much better ending.
A.2) 28... Kg8 29.Bxf6 Rh7 (29... Re1+ looks similar to A.1) 30.Rxh7 Kxh7 31.Bd4 with an extra pawn and a much better ending.
B) 27... Bxc3 28.Rxe7+ Kg8 29.bxc3
B.1) 29... Rxc7 30.d6 Rc8 31.Rxd7 with an extra pawn and a won ending. For example, 31... Rh7 32.Rxh7 Kxh7 33.Rf7+ Kg8 34.Rxb7 Rxc3 35.d7 Rd3 36.Rb8+ wins.
B.2) 29... Rh7 30.Rxh7 Kxh7 31.Rf7+ Kg8 32.Rxd7 + - [N+P].
C) 27... Kf7 28.d6
C.1) 28... e5 29.Bxe5 Nxe5 30.Rxe5 Kg7 (due to 31.Re7+ winning the bishop) 31.Ne6+ Kf7 32.d7 wins.
C.2) 28... e6 29.Nxe6 wins a pawn with a much better position.
C.3) 28... exd6 29.Nd5 wins decisive material.
|Jun-13-15|| ||legi: mike1: If 27.Kf7, I guess 27...d6 and if 28.ed then the bishop is endangered. e.g. 28...BxB 29.NxB Nd5 winning a piece.|
|Jun-13-15|| ||morfishine: Black had to play 27.d5 <27...Rxc7>|
<patfoley> Thanks for the post
|Jun-13-15|| ||wooden nickel: I was trying to think but nothing happened!?... a rook sac seemed obvious for a puzzle, however 27.Rxe7+ fails and 27.Rxf6 turned out to be a dead end. The trick to 27.d5 is although the knight on c7 is hanging, it's poisoned:
27.d5 Rxc7 28.Rxe7+ Kg8 29.Rxf6 Nxf6 30.Rxc7
click for larger view
|Jun-13-15|| ||gofer: It is obvious what is about to happen. White is going to exploit the pin
along the a1-h8 diagonal, by advancing the d pawn. But the move order that
is necessary to best effect this is absolutely not obvious!!|
We could start with any of Rxf6, Rxe7, Nd5 or d5. But although I think
Rxf6 looks very promising, I think we instead play the <GOOT>.
<27 d5 ...>
White threatens 28 Rxe7+ Kg8 29 Rxd7
Neither of the rooks can come to black's aid...
27 ... Rcf8/Rhf8
27 ... Rxc7
28 Rxe7+ Kg8
29 Rxf6! Rxc3
30 Rxg6+ Kf8
31 Rxd7 Rc1+
32 Ke2 Rc2
33 Kd3 Rxb2
27 ... Bxc3
28 Rxe7+ Kg8
29 bxc3 Rxc7
30 d6 Rc8
27 ... Kf7
It all looks pretty bleak, but have I even got the first move right...?
Hmmm, well yes and no...
|Jun-13-15|| ||kevin86: White will gain a rook or mate by the Arabian Method|
|Jun-13-15|| ||chrisowen: Trip d5 again thought as good in ever angle,
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|Jun-13-15|| ||chrisowen: Descry am bane give on drive free trys tomb in delve i et tu brute in under guffaw heartily aid f4 after horse acts e5 line i do give glorify oh door as put in het up fatefuls as ever line frugals and got fashion of am pair of f3 rooks off an e1 stipulate give monarch g8 as no da vow in let up again dives f6 am read rep lie now dutiful
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focus focal point corroborate 30.Nd5 f5 31.Rc7 Nb6 32.Nxb6 axb6 swap in b7 all d6 rook takes back and light has passers.
|Jun-13-15|| ||CountryGirl: This is an excellent combination, hats off to Negi.|
|Jun-13-15|| ||patzer2: here's my look at the game and the Saturday puzzle position (27. ?) with the chessgames.com Opening Explorer and Deep Fritz 14:|
<7... Nf6> Here I prefer the more popular 7...Nd7 as in Wei Yi vs M Rodshtein, 2015
<9...Nbd7> Several strong GMs prefer this move, but I like the more simple 9... Bxd3 as
in A Filipenko vs M Turov, 2010
<13...Qd5> A good alternative is 13... Rd8 when play might continue 14. exf7+ Kxf7 15. Qe2 e6 16. Bf4 Nf6 17. Re1 Qd5 18. Rh3 Bc5 19. Be5 Qd2 20. Bc3 Qxe2+ = (+0.03 @ 21 depth, Deep Fritz 14).
<15...g6> Perhaps a safer alternative is 15... fxe6 when play might continue 16. Bf4 Rc8 17. Nd4 Nf6 18. c3 Kf7 19. Re1 Ne4 20. f3 Nc5 21. Re3 g6 22. b4 Na4 23. Nxe6 Rxc3 24. Nd8+ Ke8 25. Ne6 Rc4 26. Kf2 Rxb4 27. Rhe1 Rh7 28. Kg3 d4 29. Re5 Nb6 30. R5e4 Ra4 31. Nxd4 Nd5 32. Ne6 Rxe4 33. Rxe4 b6 = (+0.21 @ 21 depth).
<17...Bg7> A good alternative is 17... g5 when play might continue 18. exf7+ Kxf7 19. Nh5 Rd8 20. c3 Rg8 21. hxg5
dxc3 22. g6+ Rxg6 23. Bxc3 Nf6 24. Nxf6 exf6 25. Rh4 Rd5 26. Re1 h5 27. Ree4 Bd6 28. g3 = (+0.06 @ 21 depth).
<18...Nf8> Here Fritz finds the stronger 18... Rc8! when play might go 19. c3 g5 20. Nh5 Be5 21. Re1 dxc3 22. bxc3 Bf6 23. Nxf6+ (23. hxg5 hxg5 24. f4 gxf4 25. Nxf6+ exf6 26. Bxf4 Ke7 27. exf7+ Kxf7 28. Rd1 Ke6 29. g4 b6 =) 23...exf6 24. hxg5 hxg5 25. f4 Rd8 26. Be3 fxe6 27. fxg5 Kf7 28. gxf6 Nxf6 29. Bxa7 Rxh3 30. gxh3 Rd3 31. Bd4 Nd5 32. Rb1 Nxc3 33. Rxb7+ Kg6 34. Rg7+ Kf5 35. Bxc3 Rxc3 36. Rf7+ Kg5 37. a4 Rxh3 38. a5 Ra3 39. Ra7 Kf4 40. Ra8 Ke5 41. a6 Kd5 42. Rd8+ Kc6 43. Re8 Kd5 44. Ra8 Kc6 45. Ke2 e5 46. Re8 Rxa6 47. Re6+ Kb7 48. Rxe5 =.
<21...Nd7?> This allows White a near decisive advantage. Instead, Black can hold with 21... Rd8 when play might continue 22. Bb4 Nh7 23. c4 dxc3 24. Bxc3 g5 25. Nd3 Rhe8 26. Ne5+ Kg7
27. hxg5 hxg5 28. g3 (+0.52 @ 22 depth).
<22. Nd5!> White has a near decisive advantage with this move.
<22...Kg7> Black is probably lost against a GM or computer, but can still put up more resistance with 23... dxc3 when strong play might go 24. Bxc3 g5 25. h5 Rhf8 26. g4 b6 27. Bb4 Kg8 28. Bxe7 Bxe7 29. Rxe7 Rxf3 30. Rxe8+ Kg7 31. Re6 Rf7 32. Ne3 Kh7 33. Nf5 Nf6 34. f3 Ng8 35. Rc6 Nf6 36. Kf2 Ng8 37. b4 Rb7 38. b5 Rd7 39. Ke2 Rb7 40. Ke3 Rf7 41. Ke4 Rb7 42. Ke5 Rf7 43. Ke6 Rf6+ 44. Kd5 Rf7 45. Ke5 Rd7 46. Ke6 Rb7 47. Rd6 Kh8 48. Rd8 Kh7 49. Rf8 Kh8 50. Nxh6 Re7+ 51. Kf5 Re3 52. Rxg8+ Kh7 53. Kxg5 (+24.74 @ 20 depth).
<25. Bc3> Stronger here according to Fritz is 25. Ra3! when play might go 25...a6 26. Rc3 e6 27. Rc7 exd5 28. Rxd7+ Kf6 29. Rxe8 Rxe8 30. Bxh6 Re7 31. Rxd5 Ke6 32. Re5+ Kd6 33. Re2 (+1.80 @ 23 depth).
<27. d5!!> This strong move solves today's Saturday puzzle.
<27...Kg8> The strongest reply in a lost position.
If 27... Bxc3, White wins after 28. Rxe7+ Kg8 when play might continue 29. bxc3 Rxc7 30. Rff7! (Also winning is 30. d6! Rc8 31. Rxd7 Rh7 32. Rxh7 Kxh7 33. Rf7+ Kg8 34. Rxb7 Rd8 35. d7 Kf7 36. Rxa7 Ke7 37. Ke2 h5 38. a4 ) 30... Rxc3 31. Rg7+ Kf8 32. Ref7+ Ke8 33. Rxd7 Rc1+ 34. Ke2 Rc2+ 35. Ke3 Rc8 36. Rge7+ Kf8 37. d6 b6 38. Rxa7 Rb8 39. Kd4 h5 40. Reb7 Rxb7 41. Rxb7 h4 42. Rb8+ Kg7 43. Rxh8 Kxh8 44. Ke5 Kg8 45. Kf6 Kf8 46. d7 Kg8 47. d8=Q+ Kh7 48. Qf8 g5 49. Qg7#.
<28. Bxf6! exf6 29. d6! Rd8 30. Rfe3! Ne5 31. f4! Nc6 32. Re8+! Kf7 33. R1e7+! Nxe7 34. Rxe7+ Kg8>
If 34...Kf8, then it's mate-in two with 35. Ne6+ Kg8 36. Rg7#.
<35. Ne6 1-0> Black resigns. The threat 36. Rg7# is decisive. If 35...Rh7, then simply 36. Nxd8 wins easy.
|Jun-13-15|| ||RandomVisitor: <patzer2><<13...Qd5> A good alternative is 13... Rd8>R4 disagrees... with best play|
click for larger view
Rybka 4.1 x64:
<[+0.23] d=23 13...Qd5> 14.exf7+ Qxf7 15.Qe2 e6 16.Be3 Be7 17.Rh3 0-0 18.Re1 e5 19.a3 b6 20.Kg1 Rad8 21.b4 Qd5 22.Nh5 Nf6 23.Rg3 Nxh5 24.Qxh5 Qf7 25.Qg4 Kh8
<[+0.29] d=23 13...fxe6> 14.Qe2 Rd8 15.c4 Nf6 16.Bf4 Qb4 17.b3 Qc3 18.Re1 Qd3 19.Qxd3 Rxd3 20.Ke2 Rd7 21.Kf3 Rd3+ 22.Re3 Rd2 23.a4 g6 24.Rhe1 Kf7 25.Rxe6 Rd7 26.Bb8 a5 27.R6e3
|Jun-13-15|| ||patzer2: <RV> What does R4 show after 13... Rd8
14. Qe2 fxe6 15. c4 (transposing to your line above) 15...Nf6 16. Bf4 Qb4 17. b3 Qc3 18. Re1 Qd3 19. Qxd3 Rxd3 20. Ke2 Rd7 21. Kf3 g6 (instead of 21...Rd3+)? |
At 26 depth, Deep Fritz 14 is giving 21...g3 22. Rxe6 Kf7 23.Re2 Bg7 24.Ne4 Nxe4 25.Rxe4 Rd3+ 26.Re3 Rhd8 27.Rhe1 h5 28.g3 Rxe3+ 29.Bxe3 Bc3 30.Re2 b6 31.Bf4 e6 32.Kg2 c5 33.a3 Rd3 34.Re3 Rxe3 35.Bxe3 Bb2 36.a4 Bg7 37.Bg5 Bf6 38.Bf4 = (+.003 @ 26 depth).
However, my intuition is telling me White is slightly better in this position, despite the optimistic Fritz assessment of equality. Certainly White's position is easier to play.
|Jun-13-15|| ||RandomVisitor: <patzer2>I am running an analysis of 13...Rd8 now and I will post in a bit. Low-ply runs are unexplainably equal...|
|Jun-13-15|| ||RandomVisitor: <patzer2><13...Rd8 14. Qe2 fxe6 15. c4 Nf6 16. Bf4 Qb4 17. b3 Qc3 18. Re1 Qd3 19. Qxd3 Rxd3 20. Ke2 Rd7 21. Kf3 g6>|
click for larger view
Rybka 4.1 x64:
[+0.25] d=22 22.Rxe6 Kf7 <23.Ree1> Bg7 24.Rd1 Rhd8 25.Rxd7 Nxd7 26.Ne4 b6 27.Bc7 Rc8 28.Bg3 Rd8 29.Bf4 Nf6 30.Be3 Nd7 31.h5 Ne5+ 32.Ke2 g5 33.Rd1 Rxd1 34.Kxd1 Ke6 35.Ke2 Ng4
|Jun-13-15|| ||patzer2: <RV> Thanks!|
|Jun-13-15|| ||RandomVisitor: After 13...Rd8:
click for larger view
Rybka 4.1 x64:
<[+0.24] d=23 14.Qe2 fxe6 15.c4 Nf6 16.Bf4 Qb4 17.b3 Qc3 18.Re1 Qd3 19.Qxd3 Rxd3 20.Ke2 Rd7 21.Kf3 g6> 22.Ne4 Rd3+ 23.Re3 Rxe3+ 24.Kxe3 Nd7 25.h5 Rg8 26.hxg6 Rxg6 27.Kf3 Bg7 28.Rd1
|Jun-14-15|| ||RandomVisitor: <patzer2><13...Rd8 14. Qe2 fxe6 15. c4 Nf6 16. Bf4 Qb4 17. b3 Qc3 18. Re1 Qd3 19. Qxd3 Rxd3 20. Ke2 Rd7 21. Kf3 g6>|
Rybka 4.1 x64:
[+0.25] d=26 22.Rxe6 Kf7 23.Re2 Bg7 24.Rd2 Rxd2 25.Bxd2 Rd8 26.Be3 b6 27.Ne4 Nd7 28.Kg3 Nf6 29.Kf4 Ke6 30.Re1 Kf7 31.Re2 Nh5+ 32.Kf3 Nf6 33.Rc2 Nxe4 34.Kxe4
|Jun-14-15|| ||CHESSTTCAMPS: Material is even, but white is in the process of invading, with both rooks lined up on excellent lines. The Nc7 is under attack, but it serves the useful purpose of keeping a black rook away from e8, so why not keep it there? The e7 pawn is the linchpin of the black position, so one way to attack it is to pin the bishop that guards it.|
White quickly recovers material for the sacrificed knight, if accepted. I spent time trying to make 27.Rxf6 work, but keeping the tension makes much more sense with white having control of the key lines. (GMs, of course, wouldn't waste time on a weaker alternative like this.)
A) 27... Rxc7 28.Rxe7+ Kf8 29.d6! (Bxf6? Rc1+ 30.Ke2 Nxf6 31.Rxb7 is better for white, but less convincing) Rxc3 (Rc6 30.Rxd7 and Rf6 falls) 30.bxc3 1-0
A.1) 28... Kg8 29.Rxf6 Rxc3 (Nxf6 30.Rxc7 and the pin wins more material) 30.Rxd7 Rd6 31.Rxg6+ Kf8 31.R6g7 and the doubled rooks on 7th win.
B) 27... Bxc3 28.Rxe7+ Kg8 29.Rxd7! Bxb2 30.R6f7! and black can't stop Ne6 followed by Rg7#, without giving up Rh8.
Time for review...
|Jun-14-15|| ||CHESSTTCAMPS: Failed to analyze the game defense, where Rg7 mate is still a key theme.|