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Oct2508   Ladolcevita: I got the previous two moves,25.g4,bc2 26.Ra2,but then i thought black resigned,because i didnt see if Qxa2,then the queen also will protect the f7pawn~~~
Anway,its not difficult to checkmate afterwards,right?I still successfully found the correct logical clue!And this is a Saturday Puzzle!~~ 

Oct2508
  patzer2: For today's Saturday puzzle solution, the decoy and deflection sham sacrifice 25. g4! decisively undermines Black's overworked Bishop. Here's a look at some of Black's options after 25. g4! If 25... Bxg4, then 26. Ng5 .
If 25... Be6, then 26. Rab1 .
If 25... Be4, then 26. Ng5 .
If 26... Qc3, then 27. Rxc2 Qxc2 28. Ng5 .


Oct2508   cyclon: This is (tactical) surgery. 26.Ra2!! (idea connected to 25.g4!). Very difficult, yes. 

Oct2508   Ladolcevita: No,its not!
You see,first you notice that Ng5,Qh7# is touchable.But then,you found black queen is just in the crucial a1h8 diagonal to defend it.So why not Rb1?Then the queen cannot still defend this diagonal while taking care of his knight or capture the rooks.But then you find the abhorrent black bishop is hanging there.So it comes to how to wipe bishop away.Then suddenly you discover g4 a very natural and effective move.Since the bishop is destined to not be comfortable any more in any possible square.Finally its ending like this.Huh~~ 

Oct2508
  FSR: Woops! It just dawned on me that I forgot to put 28.Qh7+ and 29.Qh8+ into my analysis. D'oh! Hope people knew what I meant. Hiarcs is right about 32.Qf4+ leading to a forced mate; not that the game continuation was half bad. I think 32.Nxf7+ looks more natural to humans since it gets the knight into the action. 

Oct2508   skemup: found the first 3 moves in 15 minutes :) 

Oct2508   realbrob: My idea was more or less the following:
what is preventing White from playing Ng5? The Black queen. This means we have to remove the defender. 25.Ra2 could be a patzer trap, but it's never going to work, Black can just move the queen back to g7. 25.Rab1 instead threatens to win the black N if Black's queen moves. What is preventing White from playing Rab1? The Black bishop. So let's start removing it. 25.g4
Now if 25..Bxg4 White has 2 ways to win a piece, 26.Ng5 (slightly better maybe) 26..Qg7 27.Qxg7+ Kxg7 28.Bxg4 or 26.Rab1 Qg7 27.Qxg7+ Kxg7 28.Rxb6. 25..Be4 loses a piece as well (26.Ng5 Qg7 etc.)
25..Bc2 26.Ra2 (always the same theme) if Black moves the queen White wins a piece again. I must admit I had not calculated the whole variation after 26..Qxa2 27.Ng5 Rfe8. But we could say this is a desperate defense by Black, considering that his king gets stuck in the middle of the board with all the White pieces attacking him. Fabula docet: big structural weaknesses around your king are nearly always a source of big trouble.. 

Oct2508   hedgeh0g: Got it! 

Oct2508
  patzer2: After 25. Ra2! Qxa2 26. Ng5 Re1, White plays a short pursuit combination using two Queen checks (deflection) and a key discovered check to win back material and force the helpless, exposed King into a lost position. 

Oct2508   veerar: Blacks 6 thro' 8 is against the spirit of KID,in which the aim is King's side play,starting with f5 in the early stages of the game! 

Oct2508
  whiteshark: 25.g4! wins a minor piece! 

Oct2508
  kevin86: I did answer the first move,though I didn't come up with the proper continuations. I did see the possibility of luring the queen away with a juicy rook as bait. 

Oct2508
  johnlspouge: Saturday (Very Difficult)
G Agzamov vs Tringov, 1983 (25.?) White to play and win.
Material: Even. The Black Kg8 is stalemated. The Black Qb2 has the burden of preventing mate: 25.Ng5 Qg7 [or Qh8] [else, 26.Qh7#]. The Black Qb2 could be skewered to Nb6, but Bf5 prevents Ra1b1. All White pieces except Qh6 require activation, but the open nature of the position encourages rapid deployment. Except for suicidal Q moves, checks and captures are unavailable, so any forcing candidate must be a threat. Candidates (25.): g4
25.g4 (threatening 26.gxf5 or the skewer 27.Rab1 28.Rxb6) Black cannot accept the P sacrifice:
(1) 25…Bxg4 26.Ng5 Qg7 [or Qh8] [else, 27.Qh7#]
27.Qxg7+ Kxg7 28.Bxg4
Because of the skewer threat, Bf5 must remain on the b1h7 diagonal. (2) 25…Be4 26.Ng5 Qg7 [or Qh8] [else, 27.Qh7#]
27.Qxg7+ Kxg7 28.Nxe4
(3) 25…Bc2
The original sacrifice is already justified, because White can win Pc5 with (3.1) 26.Ng5 Qg7 [or Qh8] [else, 27.Qh7#]
27.Qxg7+ Kxg7 28.Rac1
forcing Bc2 to move and permitting Rxc5. <Toga evaluates the line at +0.56.> I thought the best continuation was:
(3.2) 26.Rac1
(threatening 27.Rxc2 Qxc2 28.Ng5 Rf8moves [else 29.Qh7#] 29.Qh7+ Kf8 30.Qf7#)
Unfortunately, 26...Bb3 prevents the skewer. <Toga evaluates the resulting position at about +0.90 P vs. +3.84 P for the aggressive and forcing 26.Ra2.> 

Oct2508   Woody Wood Pusher: I saw 25.g4,Bc2 26.Ra2,Qxa2 27.Ng5,Re8 28.Qh7+,Kf8 led to a big attack with probable mate and called it a day. Key moves are 25.g4 and 26.Ra2! IMO 

Oct2508   Woody Wood Pusher: 32.Qf4+ forces mate in 6.
Anybody who saw this all the way to mate gets my applause! 

Oct2508   fouard: Ng5 looks like the obvious thing to try, but after Qg7 or Qh8, I see nothing promising. Seeing nothing better involving pieces, I glance at g4. The bishop obviously can't take the pawn, and my objective is to palay Rab1 anyway. Bc2 is the only move black has now, so white plays Rac1. To not lose the knight, the bishop must play to b3. Knowing the Queen can't leave the long diagonal, white picks up the cpawn. This is probably not the solution, as white is now only slightly ahead, but he does also seem to have more play. 

Oct2508   AlfieNoakes: I got 25 g4 Bc2 but then played Rc1 instead, missing the critical Ra2 which unlocks the whole combination. Am pleased with myself for getting the right start though :) 

Oct2508
  Domdaniel: Had to be 25.g4 Bc2 26.Ra2  the only way to keep making threats and preventing Black's ...Qg7. Clearly 25.Rb1 would work except for the annoying bishop: so get to work on the bishop. I admit I thought that the Re1 would guarantee a quicker mate. Much as <Woody> says. 

Oct2508   Woody Wood Pusher: Hey <Dom> do we have a notation for "big attack with probable mate and good enough for me"? *flashes soft fleshy bits* 

Oct2508   JG27Pyth: Well, I saw the whole position quite clearly, so clearly in fact that I was able to think, "I'll bet a superior player with better imagination than I finds a way to deflect the Queen from defending the long diagonal with some clever move that for some reason completely eludes me." Well reasoned, eh? Damn  g4! of course!
I must in the future remind myself that while chessgames.com puzzles trend very strongly toward first move sacs  or what seem at first glance to be sacs  every now and then the first move is quieter just to keep us solvers honest. 

Oct2508
  lost in space: Took me a while to find the best move.
25. g4! Bc2
or Bxg4 26. Ng5 Qg7 (26...Rfe8 27. Qh7+ Kf8 28. Qxf7) 27. Kxg7 Bxg4
or 25...Rfe8 26. Ng5 Be6 27. Rab1! Qg7 28. Qxg7 Kxg7 29. Rxb6 26. Ra2! Qxa2 27. Ng5 Rfe8 28. Qh7+ Kf8 29. Qh8+ Ke7 30. Bb5 Qe6 31. Rxe6 fxe6 32. Qe5 Ra7 33. Qxe6+ Kf8 34. Qxe8+ and Black is lost Time to check 

Oct2508   JG27Pyth: What a superb puzzle  really an attacking study/analysis study. So much to work with if one can see the creative possibilities latent in the position. 

Oct2508   aazqua: Great puzzle, but I'm not sure it's quite a Saturday difficulty. As has been mentioned, clearly moving the queen off the diagonal is key. Also of interest is that rb1 threatens q & n. Of course black can retreat with qf6, but what if that queen is needed on the diagonal, say after ng5? We now have the ingredients to assemble a combination: Put a rook on b1, threaten with ng5 and then play r*n to win. Of course, there is that pesky bishop ... so g4 is an obvious choice? The bishop has to stay on the b1 diagonal and there aren't many choices. bg4 creates another problem as well  after ng5 the bishop is hanging. Be4 loses after ng5, so bc2 is the only choice, and now the rook can force the queen off the diagonal for the cheap price of one rook (or white once again wins a minor piece and the game). Once the queen is off the diagonal, there's not much left other than hunting down the king. 

Oct2508   PositionalTactician: Quote:
"patzer2: For today's Saturday puzzle solution, the decoy and deflection sham sacrifice 25. g4! decisively undermines Black's overworked Bishop.Here's a look at some of Black's options after 25. g4! If 25... Bxg4, then 26. Ng5 .
If 25... Be6, then 26. Rab1 .
If 25... Be4, then 26. Ng5 .
If 26... Qc3, then 27. Rxc2 Qxc2 28. Ng5 . "
Reply:
It is not that the bishop is overworked or overloaded. It is the queen that cannot move from the a1h8 diagonal. Therefore, the queen is overloaded. This is my thought process:
The queen cannot move from the a1h8 diagonal or else Ng5 wins. Therefore, if we can ensure that the queen has another threat to take care of, then we will win. Since both the queen and the knight is on the bfile, g4 comes to mind, to deflect the bishop and allow for Rab1. If black moves the bishop to e4, Ng5 is a fork of the h7 square and the bishop on e4, so that is not possible. So the only move is the bishop to c2. Now, continuing the theme of overloading, Ra2 can be found (Well, frankly, I tried to make Rb1 work first...). The queen is now overloaded on another line. It has to protect the bishop and the h7 square by Qg7 or h8. Therefore, if the queen remains on the a1h8 diagonal, White can simply play Rxc2, winning a piece. Now, the only move is Qxa2, as it protect the f7 square and prevents checkmate on that square. Now the calculation of lines follows. One still has to find Bb5, but it is much easier compared to the earlier moves. 

Oct2508   DarthStapler: I got the first three moves 

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