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Mar2909   5hrsolver: 29.Rh7!! I will take full credit for this one. The first time I can say that for a sunday problem. Kramnik missed it, that is how hard todays problem is. It actually helped that I was not looking too deeply into any variations. I was looking for a knockout punch and I found it. 

Mar2909   patzer2: I noticed a few comments about "Kramnik cannot play sicilians." According to the repetoire explorer for Kramnik his winning percentage after 1. e4 c5 with Black is 33.9% versus only 14.7% losses and 51.4% draws. With wins or draws in 85.1% of his games as Black with the sicilian, I'd say this remark about Kramnik's play in the sicilian is a hasty generalization. 

Mar2909   patzer2: It almost appears as if Akopian had prepared today's puzzle solution as a trap when he played 27. Nf5! to invite 27...Nc4 28. Qc3 Rc7? 29. Rh7!! . Or Perhaps he saw that the alternative 27. Bxb7 might fizzle out to near equality after 27. Bxb7 Nc4 28. Qc3 Nb6 29. Bxc8 Na4 30. Ne6! Nxc3 31. Rd8+ Be8 32. Bxc3 Qc4 33. Rxe8+ Kf7 34. Bd4 Rxc8 35. Rxc8 Qxc8 36. Re1 g4 37. f4 = to . 

Mar2909   ounos: I settled for the correct first move! Disappointed though because I couldn't figure out this mess. Still happy to see Rh7 had potential :) 

Mar2909   CHESSTTCAMPS: Material is even and both sides are directing force in an attempt to exploit a weakened enemy king position. Black's threats against the white king look serious if he can double rooks on the cfile. An assessment of mobility indicates an advantage to white due to the bad bishop on g7. A focus on this one element reveals a limitedtime tactical opportunity, given that black can force an exchange of queens. 29.Rh7!
A direct attack against the immobile bishop is possible because of the deadly battery and the open hfile. A short calculation shows that the rook can't be taken: A. 29... Kxh7 30.Nxe7+ Kh3 31.Rh1+ Bh5 32.g4 Qxb2+ 33.Qxb2 Nxb2 32.Rxh5# A.1 30...Kh1 31. Rh1+ Bh6 32.Rxh6+ Kg7 33.Qxf6+ Kf8 34.Kh8# A.2 30...Bg6 32.Bxg6+ Kh8 (Kh6 33.Rh1#) 33.Rh1+ Bh6 34.Qxf6# Declining the rook does not appear much more promising: B. 29...Qxb2+ 30.Qxb2 Nxb2 31.Rxg7+ Kf8 32.Rh1 wins
C. 29...Nxb2 30.Rxg7+ Kf8 31.Qxb2 (Qxc7?? Qa1+ 32.Kd2 Qxd1+ 33.Ke3 (Kc3 Na4#!) Nc4+ wins the queen) Qxb2+ 32.Kxb2 e6 Here white has a choice of favorable endings, but I like 33.Rh7 (Rxf7+ also keeps an advantage, but B+N may not coordinate well against black's Kside pawn mass) exf5 34.Bxf5 (34.Rh8+ Bg8 35.Bd5 Rg7 seems to hold) with an extra pawn, control of c8, and the threat of Bg6 yields a won rook and pawn. C.1 31...Qe6 or 31....Rac8 are met by 32.Rdh1
D. 29....Bf8 30.Rdh1 Be6 (...Bg6 31.Bd5+) 31.Rh8+ Kf7 32.R1h7+ Ke8 33.Ng7+ Kf7 34.Nxe6+ Kxe6 35.Bd5+ Kf5 36.Qd3+ leads to a quick mate. Time to see if there's a better defense I missed. 

Mar2909   CHESSTTCAMPS: <johnlspouge> <wrote Hi, <dzechiel>. Indeed, my analysis was done while sleep deprived.> Yep, we East Coasters have it tough if we want to post solutions early after the puzzle is posted. I propose that the time when the puzzle is posted should be rotated 8 hours every month or so, so everyone gets a fair shot. 

Mar2909
  agb2002: Black threatens ... Rac8 and ... Nxb2 Qxc7? Nc4. However, the Black castle is so weak that White can start a decisive attack with 29.Rh7: A) 29... Kxh7 30.Nxe7+ Kh6 (30... Kh8 31.Rh1+ and mate soon; 30... f5 31.Qxg7#; 30... Bg6 31.Bxg6+ and mate soon) 31.Rh1+ Bh5 32.g4 A.1) 32... Qxb2+ 33.Qxb2 Nxb2 34.Rxh5#.
A.2) 32... Bf8 33.Qxf6#.
A.3) 32... Bh8 33.Rxh5+ Kg7 34.Qxf6#.
B) 29... Bh8 30.Nxe7+
B.1) 30... Rxe7 31.Rxh8+ Kxh8 32.Qxf6+ and 33.Qg7#
B.2) 30... Kf8 31.Rxh8+ followed by 32.Qxf6+ winning. B.3) 30... Kg7 31.Qxf6#.
C) 29... Bf8 30.Rdh1
C.1) 30... Be6 31.Rh8+ Kf7 32.R1h7+ Ke8 (32... Kg6 33.Nh4#) 33.Rxe7+ Rxe7 34.Rxf8+ Kd7 (34... Kxf8 35.Qxf6+ and mate soon) 35.Qd4+ Kc7 36.Qc5+ Kd7 37.Qxe7#. C.2) 30... Bg6 (or Be8) 31.Bd5+ winning.
D) 29... Qxb2+ 30.Qxb2 Nxb2 31.Rxg7+ Kf8 32.Rdh1 Ke8 33.Rh8+ winning. E) 29... Nxb2 30.Rxg7+ Kf8 31.Qxc7 Nc4 32.Qxe7#.
Time to post, check and have dinner. 

Mar2909   CHESSTTCAMPS: <agb2002:> wrote <E) 29... Nxb2 30.Rxg7+ Kf8 31.Qxc7 Nc4 32.Qxe7#> 31.Qxc7 loses to 31...Qa1+. I noticed because I nearly fell into this. 

Mar2909   znprdx: Although 29.Rh7!? certainly gets the adrenalin going  I'd like to know more about the time on the clocks ..However I do not understand why Black can't defend with the simple ...e6
30.Rx[B]g7+ Kf8 Now is 31. Rh1 really playable? After e6x[N]f5 32.R(h)h7 seems a little slow given f5 x[B]d4 but I guess 33.Qxf6 forces Qxb2+ 34.Qx[Q]b2 Nx[Q]b2 35. Kx[N]b2 the best Black has is R(a)c8 which can met with 36.c4! at which point e3 looks interesting 37.Rxg5
Re8! Now this is insane indeed 38.Rh8+ Ke7
39. Re5+ Kd7 40.R(h)x[R]e8 Bx[R]e8 time control 41.c5! but this is no sure win. Perhaps 32.Rx[B]f7+ Rx[R]f7 38. Rh8+ Ke7 39.Rx[R]a8 Rh7! 41 40.Kd1 Nx[B]b2+ 41.Ke2 is more promising 

Mar2909
  agb2002: <CHESSTTCAMPS: <agb2002:> wrote <E) 29... Nxb2 30.Rxg7+ Kf8 31.Qxc7 Nc4 32.Qxe7#> 31.Qxc7 loses to 31...Qa1+. I noticed because I nearly fell into this.> You're right. For some reason I thought that 32... Qxd1+ was not possible. Krogius should know... 

Mar2909   WhiteRook48: easy, 29. Qxg7#
I only wish it were legal. 

Mar2909
  Open Defence: <Oliveira> please check my post on the kibitzer's cafe 

Mar2909
  whiteshark: <Oliveira> D Ciuksyte vs V Golod, 2003
click for larger view <19...>? 

Mar2909
  tpstar: <Once> upon a time
DarthStapler our zen master
"I didn't get it"
<znprdx> After 29 ... e6 30. Rxg7+ Kf8 31. Rh1 exf5 32. Rh8+! mates as <TheBish> stated, so it truly is 29. Rh7!! here. 

Mar2909   qjuice14: "znprdx: Although 29.Rh7!? certainly gets the adrenalin going  I'd like to know more about the time on the clocks ..However I do not understand why Black can't defend with the simple ...e6 30.Rx[B]g7+ Kf8 Now is 31. Rh1 really playable? After e6x[N]f5 32.R(h)h7 seems a little slow given f5 x[B]d4 but I guess 33.Qxf6 forces Qxb2+ 34.Qx[Q]b2 Nx[Q]b2 35. Kx[N]b2 the best Black has is R(a)c8 which can met with 36.c4! at which point e3 looks interesting 37.Rxg5 Re8! Now this is insane indeed 38.Rh8+ Ke7
39. Re5+ Kd7 40.R(h)x[R]e8 Bx[R]e8 time control 41.c5! but this is no sure win. Perhaps 32.Rx[B]f7+ Rx[R]f7 38. Rh8+ Ke7 39.Rx[R]a8 Rh7! 41 40.Kd1 Nx[B]b2+ 41.Ke2 is more promising" If 29...e6 30. Rxg7 Kf8 then 31. Rxf7+ is devesating due to the undefended f6 square and BQ combo on that diagnol and the knight on f5 

Mar2909   CHESSTTCAMPS: <qjuice14:> wrote <[snip]However I do not understand why Black can't defend with the simple ...e6 30.Rx[B]g7+ Kf8 Now is 31. Rh1 really playable? [snip]> After 29...e6 30.Rh1 is not a good idea. Instead 30.Rh7 exf5 31.Rh8+ Bg8 (Kg7 32.Qxf6#) 32.Qf6+ Rf7 33.Rxg8+ mates next move. If instead 30.Rh7 Qxb2+ 31.Qxb2 Nxb2 32.Kxb2 exf5 33.Bxf5 we reach (by transposition) the same position I analyzed in note C of my initial post. click for larger viewWhite has threats of Rd6 and Be6. In fact, another pawn must fall (or worse), e.g. 33...Ke7 34.Rh6 Rc6 (otherwise 35.Re1+ wins the fpawn) 35.Rd7+ Conclusion  this is an easy win and 29.Rh7! is indeed the winning shot even against best defense. 

Mar2909   CHESSTTCAMPS: My apologies to <qjuice14>. I was actually responding to the post from <znprdx>. 

Mar2909   JG27Pyth: Found Rh7 but the supporting analysis was incomplete... I could see Rh7 was the attack I wanted but couldn't calculate the mating net arising from the discovered check if the rook was taken. When I considered the defense beginning with Qxb2+ I had the White king 'automatically' recapturing the black N... a real blunder. 1/8 credit. 

Mar2909
  Jimfromprovidence: The text 29 Rh7!, is winning.
click for larger viewThe alternative 28…Qxb2+ 29 Qxb2 Nxb2 30 Kxb2 Rc7 31 Rh7??, is losing!
click for larger viewIn the latter case black can simply play 31...Kxh7.
So, how come Rh7 wins in the text and does not in this alternative?? Because, unlike the text, after 32 Nxe7+, black has 32…f5+! ruining white’s day. click for larger view
If instead 28…Qxb2+ 29 Qxb2 Nxb2 30 <Rh7>?, then 30…Nxd1. click for larger viewSince white now lacks the rook support, then after 31 Rxg7 Kg8 black is OK. 

Mar2909   5hrsolver: to <znprdx> after 29.Rh7!! 29...e6 30.Rxg7+ Kf8 31.Rh1 exf5 32.Rh8+ Kxg7 33.Qxf6# if 32.Rh8+ Ke7 33.Qxf6+ Kd7 34.Rxf7# 

Mar2909   CHESSTTCAMPS: <agb2002> wrote <[snip] You're right. For some reason I thought that 32... Qxd1+ was not possible. Krogius should know...> I had problems with Krogius, too. My line against 29...Bf8 30.Rdh1 Be6 involved a phantom rook on Rd1 and was total nonsense, whereas your line was right on target and included the nice crusher 33.Rxe7+! that I missed completely. click for larger viewThe finish from this position provided by <agb2002> in his first post: 33.Rxe7+ Rxe7 34.Rxf8+ Kd7 (34... Kxf8 35.Qxf6+ and mate soon) 35.Qd4+ Kc7 36.Qc5+ Kd7 37.Qxe7# Nice work. 

Mar3009   znprdx: <tpstar: After 29 ... e6 30. Rxg7+ Kf8 31. Rh1 exf5 32. Rh8+! mates as <TheBish> stated...>
ReallyHOW? simply32... Kx[R]g7
<qjuice14: If 29...e6 30. Rxg7 Kf8 then 31. Rxf7+ is devesating..>ReallyHOW? simply31..Rx[R]f7
Now interesting is 32. Nd6 Nx[N]d6 33. Rx[N]d6 f5!? 34. Qh8+ Ke7 and all I see is egg on White's face! <CHESSTTCAMPS:After 29...e6 30.Rh1 is not a good idea...>.that is what I'd suggested <Instead 30.Rh7> ...HOW? it is already at h7 as the supposed star move...Perhaps try setting up the position...or recheck your notes 

Mar3009
  tpstar: <znprdx> The line is 29. Rh7!! e6 30. Rxg7+ Kf8 31. Rh1 exf5 32. Rh8+!: click for larger view"simply 32 ... Kxg7" loses to 33. Qxf6#, and 32 ... Ke7 loses to 33. Qxf6+ Kd7 34. Rxf7#. These variations were already posted by <TheBish> and <5hrsolver>. 

Mar3009   znprdx: <tpstar:> & <CHESSTTCAMPS:> }et al{ my sincere apologies  some kind of strange brain freeze had set in  (I guess that is what happened to Kramnik  so I guess I need not be too embarassed) One doesn't see a move like Rh7 very often  it is really amazing ...thanx for your patience... 

Apr1309   butilikefur: After 29. Rh7 Kxh7 30. Nxe7+ Kh6 31. Rh1+ Bh5, instead of 32. g4, as has been suggested, White might simply play 32. Nf5+ and force a win. 32...Kh7 (32...Kg6 33. Nxg7+ Kf7 [33...Kxg7 34. Qxf6+ Kg8 35. Bd5+ Rf7 36. Qxf7+ Bxf7 37. Rh8+ mate] 34. Qxf6+ Kg8 35. Bd5+ Rf7 36. Bxf7+ Bxf7 37. Rh8+ Kxh8, and White moves the knight with checkmate on g7 next move) 33. Rxh5+ (33. Nxg7+ Kg8 34. Bd5+ Bf7 and White is losing) 33...Kg8 34. Bd5+ (34. Ne7+ Kf8 [34...Rxe7 35. Bd5+ Kf8 36. Bxc4 Re8+ <36...Rc8 37. Bxa2 just leaves White up a piece and a pawn> 37. Qxe8 <not 37. Kd2 Qb2 and Black is suddenly looking much better and threatening mate in 1> 37...Qxc4 38. Rh1 followed by Qe4 with a better ending] 35. Nd5 Rd7 [not 35...f5 36. Rh8+ Bxh8 37. Qxh8+ Kf7 38. Qg7+ Ke6 <38...Ke8 39. Nf6+> 39. Bxf5+ Kd6 40. Qf6+ Kxd5 41. Qd4+ Kc6 42. Qc5+ mate] with interesting complications after 36. Nxf6 Rd1+ [36...Qxb2+ 37. Qxb2 Nxb2 38. Nxd7+ Ke8 39. Bxb7 Rd8 40. Bc6 and Black cannot play Rxd7 Bxd7+ Kxd7 given Rh7 pinning the bishop  and the same idea after 39...Ra7] 37. Kxd1 Nxb2+ and 38. Ke2. Just for fun, as I think this possibility can be refuted, I found a curious variation where instead of 34. Ne7+ Kf8 35. Nd5 White plays 35. Ng6+ Kf7 36. Ne5+ fxe5 [after 36...Kf8 there is probably a perpetual] 37. Bd5+ Kg6 38. Qd3+ Kxh5 [38...Kf6 39. Bxc4 Qxc4 40. Bxe5+ Kxe5 <40...Kf7 41. Qf5+ Ke8 42. Bxc7 Qxc7 43. Rxg5 with a strong attack; if 40...Ke6 41. Qg6+ Kxe5 42. Rxg5+ Kd4 43. Qe4+ Kc3 44. Ke1+ Kd4 45. Qd2+ forces mate> 41. Rxg5+ Ke6 42. Qf5+ Kd6 43. Rg6+ Ke7 44. Rxg7+ Ke8 <44...Kd6 45. Qf6+ wins the queen> 45. Qe5+ Kd8 46. Qd6+ Ke8 47. Rxc7 and White is won] 39. Qh7+ Bh6 40. g4+ Kh4 41. Qxh6+ Kg3 42. Bxe5+ Nxe5 [43...Kf2 44. Qh2+ Ke3 45. Qg1+ Ke2 46. Qd1+ Kf2 47. Bd4+ Kg2 48. Qg1+ Kh3 49. Qf1+ Kg3 <49...Kh2 50. Bg1+ Kg3 51. Qf2+ Kf4 42. Bh2+ mate> 50. Be5+ and Black has to take with the knight] 43. Bxa2 Kxf3 44. Qh3+ and White should win the endgame) 34...Kf8 35. Nxg7 Qxb2+ (35...Ne5 36. Qxc7 Qxd5 37. Rh8+ Qg8 38. Ne6+) 36. Qxb2 Nxb2 37. Ne6+ Ke7 38. Nxc7 Rc8 39. Kxb2 Rxc7 40. Rh7+ 



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