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May1911   et 9: I made today's puzzle much more complicated than it was.
35.Rf7+ Ke5
36.Rg5+ Kd4
37.Rf4+ Kd3
38.Rb4!?
White has separated the black king from the soontobepromoted pawn, blocked the rooks' attack, and left black with no other attack. Grandiose but not necessary. A simple discovery check is just fine. 

May1911   Zaldi: Have any developped
29......,QxA3 

May1911
  Sastre: If 29...Qxa3, 30.Rf7+ Ke5 31.Rg5+ Kd4 32.Qxb5 is winning for White. 

May1911
  Marmot PFL: looks like white has good chances to win with 35 b4, stops Rxb2+ and threatens Rxe3. If Nxd5 then Rf7+ and Kxc2. 

May1911   Patriot: I decided on 35.b4 but missed a few mate threats. I noticed black was threatening at least a perpetual, but not mate in two starting with 35...Rcxb2+ (36.Ka1 Nc2# or 36.Kc1 Rc2#). Plus I missed a mating net idea noted by <mccarthpm>: <b4 runs into a mating net axb3 36.g7 Nc4 37.queens Na3check then hopeless for white>. But this can be stopped: 37.Rf7+ Ke5 38.Rg5+ Kd4 39.Rf4+ Kd3 40.Rxc4. I'll have to look at this later because I don't feel 100% sure that 35.b4 is the right answer. What I like about this problem is that it requires certain elements of a good thought process to solve. It requires one to first understand what black is threatening. Without this step white would be tempted to play 35.g7? or 35.Rxe3?. Materially, black is slightly ahead (2 pawns for a piece) so with this information alone white would be happy for a draw. But white has a strong passer on g6 and if he can prevent black from mating him or forcing a draw, he should win. That's where deductive logic comes in and is why I first examined 35.Rf7+ Ke5 36.Rg5+ Kd4 37.Rf4+ Kd3 38.Rb4. Then I turned my attention to the much more simple 35.b4, seeing that 35...axb3 e.p. 36.Rf7+ Ke5 37.g7 Rc8 38.Rf8. Also after 35...Rc8 36.Rf7+ followed by 37.Rf8. 

May1911   CHESSTTCAMPS: In this dynamic endgame position, white has 2 pawns (including a dangerous gpawn) for a knight , but must deal with serious threats directed against b2. In fact, black to move would win with 35... R5xb2+ 36.Ka1 Ra2+ 37.Kb1 Rcb2+ 38.Kc1 Nc4 39.Rf7+ Ke5 40.Rb5+ Kd4 41.Rf4+ (41.Rb4+ Kd3 is no better) Kd3 42.Rxc4 Kxc4 43.g7 Kb3 and 44... Ra1# follows. If white plays 35.Rxe3?? R5xb2+ is an obvious draw. Therefore, white's only possible winning plan is to interfere with the Rb5. This suggests the simple 35.b4!
(Actually, I looked at 35. Rf7+ first, with a sequence that gets a R to b4). Now black can't stop the gpawn if white continues correctly: A) 35... ab 36.g7 Nf4 37.Rf7+! (g8Q?? Na3+/e2+ forces mate) Ke5 38.Rg5+ Kd4 39.Rf4+ K any 40.Rxc4 R(K)xc4 41.g8=Q wins A.1) 36... Nxd5 37.Rf7+ Ke5 38.Rg5+ Kd4 39.Rxd5+ K(R)xd5 g8=Q wins without difficulty, given the intact fpawn. B) 35... Nxd5 36.Rf7+ Ke5 37.Kxc2 wins
C) 35... Rc8 36.g7 Rg8 (otherwise 37.Rf7+ and 38. Rf8) 37.Rxe3 Kf6 38.Re6+ Kf7 39.Rxd6! and the Rb5 is trapped. Time to verify..... 

May1911   sevenseaman: After 29. Rg1
<If 29...Qxa3, 30.Rf7+ Ke5 31.Rg5+ Kd4 32.Qxb5 is winning for
White < Sastre>> There looks to be a small window of opportunity for Black. Let us
explore it more fully.
29. Rg1 Rxb2+
30. Kxb2 Qc3+
31. Kc1 Qa1+
32. Kd2 Qxg1
33. Qxe3 Rxc2+
34. Kxc2 Qxe3
35. g7 Kf7
And Black has the edge. 

May1911   Patriot: Correction: At the end of the post: <Also after 35...Rc8 36.Rf7+ followed by 37.Rf8.> This should say 37.g7 Rg8 followed by 38.Rf8. 

May1911   Patriot: Correction (again): 35...Rc8 36.Rxe3 looks easier. :) This is what happens when I get preoccupied with "plans" as opposed to looking at forcing replies. 

May1911
  Sastre: <sevenseaman> Your suggestion of 29...Rxb2+ is an interesting one. After 29...Rxb2+ 30.Kxb2 Qc3+ however, I think 31.Ka2 is good for White. Black has nothing better than <31...Qxc2+ 32.Qxc2 Rxc2+ 33.Kb1 Rg2 34.Rxg2 Nxg2 35.g7 Kf7 36.g8Q+ Kxg8 37.Rxe7> . After 30.Kxb2, I think 30...Qb6+ is Black's best reply. <31.Ka1 Nxc2+ 32.Qxc2 Rxc2 33.Rf7+ Ke5 34.Rg5+ Kd4 35.Rf4+ Kc3> would be winning for Black. Therefore 31.Kc1 seems to be White's only chance. <31.Kc1 Rxc2+ 32.Qxc2 Nxc2 33.Rf7+ Ke5 34.Rxe7+ Kxd5 35.Rg5+ Kc4 36.Kxc2> is probably the safest way of making a draw for White. 36.g7 would lead to a unclear position where Black would probably have to find a perpetual to force a draw. 

May1911   sevenseaman: < Sastre> I think you have the general drift. Its tricky and has to be played accurately. 30...Qb6+! I considered it a good move, then somehow it went out of my mind I do not know why and when. Draw looks to be a bit lucky for White, but fair dinkum! 

May1911   Ghuzultyy: White can't capture the knight yet because black has perpetual check. <35.b4!>
click for larger viewIf black tries to defend both pieces with 35...Rc3; white will play g7,Rf7+,Rf8 and win the game. If black plays 35...axb3, white simply captures the knight. Black has to move rooks to stop g pawn and white will win easily. If black plays 35...Rc8, it still can't stop g pawn after 36.Rf7+, 37.g7,38.Rf8 Okay, puzzle is over, but I would like to show a line that I liked during the analysis. <35.b4! axb3 36.Rf7+?>
Rf7 worked against 35...Rc8 and 35...Rc3 but can it be used against 35...axb3 <36...Ke5 37.g7 Nxd5!> click for larger viewLet's see what white can do;
A)<38.g8=Q Nc3+ 39.Ka1 b2#> 01 B)<38.Re1+ Kd4 39.Rd1+ Ke3> C)<38.Rg5+ Ke6!>
A big mistake would be to play like this 38...Kd4?? 39.Rxd5+! Rxd5 40.g8=Q Also note that after 38...Ke6, white can't play 39.Rxd5 because black wins after 39...Rxd5 40.g8=Q Rd1# <39.Rg6+ Ke5 40.Rg5+>
White draws the game. A good looking move, 36.Rf7+, ended as a disaster for white. 

May1911   AliTervia: What about 35 Ka1? Not foolproof but it slows black down. Over the board, 35......Rbxb2 still looks good, but allows
36. Rf7+ Ke5
37. Rg5+ Kd4
38. Rf4+ Kd3
39. Rb4
interrupting the mate or perpetual check possibilities. White's pawn now has a chance to promote, and material and attacking options even out. White might have to take a draw but this seems not too hard to work out and gives a fighting chance? 

May1911
  Penguincw: Hmm. This game isn't won by white, but saved by white. 

May1911   sevenseaman: <Ghuzultyy> Interesting analysis after 37... NXd5. 

May1911
  dzechiel: Looked at this briefly last night. I only considered forcing moves (following my own advice) and therefore overlooked b4! as the saving move. I like to think that if I was in the game, I would have considered b4, but can't promise it. 

May1911   psmith: Found b4 only after spending far too much time on R checks. 

May1911   gofer: <Ghuzultyy> One line I liked was one where white promotes and dies... <35 b4 Rc3>
<36 g7 Rxa3>
<37 g8=Q ...>
<GOOT>
<37 ... Rxb4+>
<38 Kc1 Rc3+>
<39 Kd2 Rc2+>
<40 Kxe3 Rb3+>
<41 Kd4 Rd2+>
<42 Kc4 b5#>
<I DID GOOT> 

May1911   cyclon: 35.b4, cufflinks. 

May1911   ZUGZWANG67: White has 2 pawns for the piece, these pawns are passed and the one at g6 is very dangerous (R behind p). Black has no piece to fight it. But Black has a possibility for a perpetual. Before cashing on his advantages White must make sure that the game won't end in a draw. At 1st I thought that 35.Rf7+ Ke5 36.Rg5+ Kd4 37.Rf4+ Kd3 (the R needs to remain protected in (!)case the N has to go after the g6pawn) 38.Rb4 should win but 38...Rxd5! 39 Rxd5 Nxd5 is not that obvious. So I found out that I needed more candidates. As I was going from candidate to candidate I could see that it was far more complicated (to me!) than I thought. I had 35.Rf7+, 35.Rg5+ and finally 35.Ka1(!!!)
Is it possible 35.Ka1 to be the move? In fact without a check ...Rbxb2 is not a so strong defensive move, after all. And ...Rcxb2 is not dangerous: the Rg1 covers b1. However the problem with 35.Ka1 is that it is a quiet move. This allows Black to do something unless 35.Ka1 has more than just removing the 38...Rxd5 option from Black's hands and preventing mate once the Rg1 has left the back rank (35.Ka1 Rbxb2 36.Rf7+ Ke5 37.Rg5+ Kd4 38. Rf4+ Kd3 39.Rb4; 35...Rcxb2 36.Rf7+ Ke5 37.Rg5+ Kd4 38. Rf4+ Kd3 39.Rb4!). But does not Black have anything else than just 35...Rxb2? There,s 35...Rc8 36.g7 Rg8 37.Rg8. This earns White a R for p or a Q for a R+p. That's all I have. Rather tough for a thursday. Either I'm right on the spot or it will be shame on me; I missed an obvious one. 
What? 

May1911   ZUGZWANG67: Ok. Let's call Rybka for help. I just can't believe that. 

May1911   chesskidnate: <Zugzwang67> didn't check with a computer but in your 35.Ka1 Rbxb2 line what about 38... Kc3 because if 39.Rb4 Rxb4 40. axb4 Rb2! threatens 41...Nc2# which I think forces white to sacrifice his rook and be dead lost 

May1911   ZUGZWANG67: <<<chesskidnate>: Zugzwang67> didn't check with a computer but in your 35.Ka1 Rbxb2 line what about 38... Kc3 because if 39.Rb4 Rxb4 40. axb4 Rb2! threatens 41...Nc2# which I think forces white to sacrifice his rook and be dead lost> You are right. My analysis is flawed. And worse than 39...Rxb4, Black has 39...Rc1 mate. Peace! 

May1911   ZUGZWANG67: <<AliTervia>: What about 35 Ka1? Not foolproof but it slows black down. Over the board, 35......Rbxb2 still looks good, but allows 36. Rf7+ Ke5
37. Rg5+ Kd4
38. Rf4+ Kd3
39. Rb4
interrupting the mate or perpetual check possibilities. White's pawn now has a chance to promote, and material and attacking options even out. White might have to take a draw but this seems not too hard to work out and gives a fighting chance?>38...Kc3 (<chesskidnate>) 39.Rb4 Rc1 mate. 

May1911   ZUGZWANG67: 35.b4. Too easy. Missed it.
Surprising that after spending soooo long trying to avoid a perpetual, this move never received the consideration it deserves in my analysis. I saw it, of course. But no more than that! Sigh! 



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