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Miguel A Quinteros vs Ron W Henley
Lone Pine (1976), Lone Pine, CA USA, rd 3, Mar-09
English Opening: Agincourt Defense. Neo Catalan Declined (A14)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Given 5 times; par: 45 [what's this?]

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sac: 36.Rxg6+ PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
Aug-28-04
Premium Chessgames Member
  Reisswolf: Doesn't 36. exf7 also win?

If 36....Bxe5 then 37. Rxg6+ Kh7 38. Be4 wins for White.

If 36...Rxf7 then 37. Qe4 wins for White.

At least that was what I had worked out (without a board, so I could be wrong).

Aug-28-04  BeautyInChess: I didn't see the second rook sac. I saw 37 Qc7+ it turns out Fritz finds that this move is mate in 8.
Aug-28-04  notsodeepthought: <Reisswolf> After 37 R:g6 then simply R:g6 (the rook protects the g pawn once the sixth row is cleared). <BeautyinChess> That's the line I saw too, though I won't pretend that I figured out the mate in 8... in any case I must admit the actual solution is more elegant.
Aug-28-04  misguidedaggression: I saw The single rook sac as well. I was looking at the double rook sac and it didn't seem to work after 39.Qg3+ Bg5 so I gave up and started calculating the single rook sac. That's when I saw 37.Qc7 Kh8 38.Rxg6 with the threat of 39.Rxh6+ Kg7 40.e7+/Qh7# I didn't see any defence without losing massive amounts of material, but I didn't think that it would mate after all the material was gone. Of course, I never thought to combine the two lines.
Aug-28-04
Premium Chessgames Member
  patzer2: The 36. Rxg6+!! solution to today's puzzle is a great example of the "demolition of pawn structure" theme, via sacrifice on g6. It also relies heavily on the theme of deflection, and in one alternate line themes of discovered check and a pawn promotion threat, to put Black into an inescapable mating web.

The power of the White Queen and Bishop in the midst of Black's disorganized pieces and demolished pawn structure is amazing!

If 36...Kh7??, then 37. Qxf6! fxg6 38. Qxg6+ Kh8 39. Qh7#.

If 37...Kh7, then 38. Qh5! Bg7 39. Rxh6+ Bxh6 40. Be4+ Kg7 41. Qg6+ Kh8 42. Qh7#.

White can also vary and win pretty with 37. Qc7+! Kh8 38. Rxg6 Rb7 (38...Rxe6 39. Rxh6+ Kg8 40. Qh7#) 39. Rxh6+ Kg8 40. Qg3+ Bg7 41. e7+ Qe6 42. Bxe6+ Rf7 43. e8Q#.

Notice the essential role of the White pawn on e6 in making this combination work (e.g. imagine the pawn removed from e6 after 39. Qc7+ Rf7). However, in the actual final position (with the pawn on e6) after 39. Qc7+, Black can only sacrifice a couple of pieces to delay the coming 42. Qh7#.

Aug-28-04  misguidedaggression: This is what CM 7000 recomends after 37.Qc7+ Kh8:

38.Rg6+ Bxb2? 39.Rxh6+ Kg8 40.Rg6? Kh8 41.Qe7 Rxf2? 42.Qd8+? Kh7 43.Qg8#

Notice 40.Qh7# and 42.Qh4#. I think I need to start looking into the latest version of Fritz. :P

Of course, this was the Solve for mate feature. On infinite time, it gives a much more believable mating sequence.

Aug-28-04  Dick Brain: I thought it was 36. Rxg6+ fg6 37. Qc7+ Kh8 38. Rxg6 which does win but I didn't figure out any more variations since the game is clearly won after that. I'm impressed with those of you who could figure this one out all the way to mate even starting with Black's rook give-away with 38...Ra7. But I would have preferred the double rook sacrifice of course if I had seen it.

I didn't solve this one too efficiently since I was looking at 36. Qf5 for quite a while and I only game myself a fixed time to solve the problem. I cannot believe that I didn't look at the sacrifices first :(

Aug-28-04
Premium Chessgames Member
  cu8sfan: Now this is almost too easy! (-:

I was thinking about possibilities after 36.♕h5 followed by ♖xg6. This doesn't seem to work because of 36....♖f8 moves and then after 37.♖xg6 the Black ♔ can flee via f8-e7-d6.

I couldn't find an immediate mate but maybe <crafty> can?

Aug-28-04
Premium Chessgames Member
  crafty: 36. ♕h5 ♗g5 37. ♕g4 ♖d6 38. ♕e4 ♖fd8 39. ♕e5+ f6   (eval 1.10; depth 14 ply; 500M nodes)
Aug-28-04  cuendillar: <the Solve for mate feature> I have the older version CM 4000 at home. I don't know if they've changed it but that matesolver only look for forced mate in an exact number of moves, ignoring quicker mates.

Concerning the problem I looked at 36.Qf5 treathening 37.Rxg6+ fxg6 (Kh7 38.Rxh6+ Kg7 39.Qh7#) 38.Qxg6 Kh8 39.Qxh6#

possible defences:36...g5 37.Rxg5+ hxg5 38.Rxg5+ Bxg5 39.Qxg5+ Kh7 (Kh8 40.Qh6+ Kg8 41.Be4 mate should follow) 40.Be4+ Kh8 41.Qh6+ Kg8 42.Qh7#

I didn't consider the 36...Bg5 defence that was shown in the game.

Aug-28-04
Premium Chessgames Member
  kevin86: I solved this one by first trying 36 exf7 ♗xe5 37 ♖xg6+ fxg6 38 ♖xg6+ but black takes with his now revived rook on third rank

Therefore,white must capture with his rooks first!

Aug-28-04
Premium Chessgames Member
  patzer2: <Kevin 86> You are correct that 36. exf7?? is bad, but 36. exf7 Bxe5 37. Rxg6+ <fxg6> is not possible. However 36. exf6 Bxe5 37.Rxg6+ Rxg6 wins decisively for Black as <notsodeepthought> noted.
Aug-28-04  ryuuchida: I thought the continuation was 36. Rxg6+ fg6 37. Rxg6+ Kxg6 38. Be4+ Kg7 39. Qf5 when mate in two is inevitable. I didn't see Qc7+ which would mate as well. I personally like Qf5 better because it's a quiet move without check. What do you think?
Aug-28-04  DexterGordon: 39.♕f5 looks pretty strong to me, <ryuuchida>!

If 39...♖h8, then 40.♕g6+ and 41.♕f7#.
If 39...♗g5, then 40.♕g6+ and 41.♕h7#.

Good catch.

Aug-28-04  RisingChamp: I took two minutes for this because let alone seeing the sacrifice of the second rook, I didnt even notice white had a rook on g1 till i looked at it for two minutes!
Aug-28-04  Whitehat1963: Nicely done. Couldn't have seen it if I had taken all day!
Aug-28-04  EXIDE: I did not see the double rook sacrifices. My move was 36. Qc7 with threat of Rxg6+ to follow. The rook sacrifices are ofcourse very elegant. Great moves!!
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Aug-28-04  PivotalAnorak: Yep <ryuuchida> I saw 39. Qf5 as well. The mate is quicker with Qf5 as with Qc7+. And like you, I definitely LOVE the fact that Qf5 is a "quiet" move...
Aug-28-04  Andrew Chapman: I felt that 15...Nxe5 was a mistake giving white a strong pawn at e5. Better to remove the knight with f6 at some point I would have thought.
Aug-29-04  dwojiow: The double rook sacrifice is the quickest and most elegant solution, but there are many ways to win this position.

I started with 36.Qf5 with the idea of Rxg6 and after 36...g5
37.Be4 (threatening Qh7#) 37...Rh8
38.Rxg5+! hxg5
39.Rxg5+! Kf8 (note that Black can't capture with the bishop because of mate) 40.Qxf6 Rxe6
41.Qxh8+
White is a piece and a pawn up with a safe King. Easy win. It's not mate, I know, and I should probably get the words "find the better move" tattoed on my right hand... Still, we have the words of Capablanca: "The strongest move is the one that causes your opponent to resign the quickest"

Aug-29-04
Premium Chessgames Member
  kevin86: <Patzer 2> Of course you are right,the pawn cannot retake as it was liquidated-but the rook can capture and it is defended by king and queen.
Aug-29-04
Premium Chessgames Member
  patzer2: After 36. Qf5! g5 37. Rxg5+ Rxg5+ hxg5 38. Rxg5+ Kf8 [38...Bxg5 39. Qxf7+ Kh6 40. Be4! Rxe6 41. Qh6#] 39. Qxf6 Rxe6 40. Bxe6 Qxe6 41. Qd8+ Qe8 42. Rg8+ Kxg8 43. Qxe8+, White wins easily.

However, I prefer the immediate 36. Rxg6!! because it wins quicker and with fewer complications.

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