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Alexander Shabalov vs Igor Naumkin
Ch URS ( 1/2 ) (1987), Norilsk
Horwitz Defense: General (A40)  ·  1-0

ANALYSIS [x]

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sac: 28.Rxh6 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Dec-20-17  Cheapo by the Dozen: I didn't make 28 Nxh6 work as smoothly as I would have liked, so I switched to

28 Qh7 Re7
29 Ne5

That threatens 30 Qh8++ and obviously wins. What's more, it unblocks the h-rook for Rf4+. Once you see that threat too, it's clear that White's position is overwhelming.

Dec-20-17  Cheapo by the Dozen: For a while Black's pieces were so blocked into the corner that it looked like a Madhouse Chess position. (That's the single-board variant from which Double Bughouse obviously got its name.)
Dec-20-17  diagonalley: <cheapo> ... me too
Dec-20-17  Walter Glattke: B2) 28.Nxh6 Rf6 29.Qh7 Rxh6 30.Rxh6 gxh6
31,Qxh6+ Kf7 32.Re5 Qf6? 33.Qh7+ Kf8 34.Rf5 Qxf5 35.Qxf5+ Ke8 36.h4!! wins Other moves possible as "B3"
Dec-20-17  ChessHigherCat: 27. Alexander to shabble off to gore buffalo.

I found the solution (which is really cool, I must admit) just because it had to be either Nxh6 or Rxh6, and I couldn't make Nxh6 work. I probably never would have seen if it hadn't been a puzzle.

Dec-20-17  et1: What is the answer to Qh7 ?
Dec-20-17
Premium Chessgames Member
  malt: First went for 28.N:h6 Rf6 29.Qh7 R:h6
(28...gh7? 29.Q:h7+ Rg7 30.Rg4/Rf4+)
Then went for
28.R:h6 gh6 29.N:h6 Rg7
30.Qf5+ wins
Dec-20-17  Cheapo by the Dozen: <et1>,

As noted above there's no good one.

But none of us seems to have calculated how long Black can postpone mate by pitching massive amounts of material.

Dec-20-17
Premium Chessgames Member
  malt: Black could close the e file with
28.R:h6 Ne6 29.Rh8+ Ke7
but 30.R:e6+! de6 31.Q:e6#
Dec-20-17
Premium Chessgames Member
  Diocletian: I also chose 28. Nxh6. When I looked ahead to the answer 28. Rxh6 I wondered what might be wrong with my move. Oh! 28...Qxh4 killing the white rook might be the trouble. However, I did not study the matter further as I am playing blitz today! Hope this helps!
Dec-20-17
Premium Chessgames Member
  whiteshark: Unlike Tal I calculate to sac my minor first.
Dec-20-17  patzer2: I had difficulty calculating 28. Rxh6 gxh6 29. Nxh6 because I saw 29...Rg7 (diagram below)


click for larger view

and immediately stopped my evaluation of this line.

If I had bothered to consider the tactical Queen retreat 30. Qf5+!, I'm sure I would have seem the mate-in-three 30. Qf5+ Qf6 31. Qxf6+ Rf7 32. Qxf7#.

Dec-20-17  DrGridlock: ... Qh7 is crushing.

Just not "as crushing" as Rxh6.

Dec-20-17
Premium Chessgames Member
  kevin86: White threaten mate in three different ways!
Dec-20-17  tino72: If you didn't pick Rxh6 then you got the puzzle wrong - no prizes for 2nd or 3rd choice moves.
Dec-20-17  morfishine: <tino72: If you didn't pick Rxh6 then you got the puzzle wrong - no prizes for 2nd or 3rd choice moves> Nice try, but sorry tino72, you are wrong. According to <patzer2> there are 17 winning moves, so if you picked one of these 17 moves that wins, then you have "solved" this puzzle

class dismissed

*****

Dec-20-17  lzromeu: <Nice try, but sorry tino72, you are wrong. According to <patzer2> there are 17 winning moves, so if you picked one of these 17 moves that wins, then you have "solved" this puzzle class dismissed>
Wait, maybe alphazero can win this game for black. :)
Dec-20-17  Patriot: <agb2002> After 28.Nxh6 Rf6, <patzer2> revealed 29.Qh7!. Without an engine, I think it may go like this: 29...Rxh6 30.Rf4+ Rf6 31.Rg4 g6 32.Rh4! and it's over. Do you see a reasonable defense? 30...Qf6 is no good since white can simply play 31.Rxf6+ Rxf6 32.Qh8+ and 33.Qxa8.
Dec-20-17  Patriot: <morf> <...there are 17 winning moves, so if you picked one of these 17 moves that wins, then you have "solved" this puzzle> I agree! OTB the only reasons I can think of to find the shorter win is time is getting low and a longer complicated win could cost you the game or even if you have enough time it would be better to find a forced mate rather than winning a piece. But choosing between a forced mate in 5 vs. 6, 7, etc. is crazy...Kramnik or just about any world champion would simply follow the forced mate line without further thought. They make check it and re-check it but they would follow it. Good to see you again!
Dec-21-17  ChessHigherCat: To the cogent arguments of my colleagues, I would add that "win" having only 3 letters, a shorter win (wi, in or wn) would be incomprehensible!
Dec-22-17
Premium Chessgames Member
  agb2002: <Patriot: <agb2002> After 28.Nxh6 Rf6, <patzer2> revealed 29.Qh7!. Without an engine, I think it may go like this: 29...Rxh6 30.Rf4+ Rf6 31.Rg4 g6 32.Rh4! and it's over. Do you see a reasonable defense? 30...Qf6 is no good since white can simply play 31.Rxf6+ Rxf6 32.Qh8+ and 33.Qxa8.>

I've just noticed your post, sorry.

29... gxh6 loses to 30.Rg4 and after 29... Rxh6 30.Rf4+ Rf6 31.Rg4 g6 32.Rh4 Ne6 (32... g5 33.Qh8+ Kf7 34.Rh7+ Kg6 35.Rg7+ Kf5 36.Qh3+ g4 37.Qxg4#) 33.dxe6 dxe6 34.Qh8+ Ke7 35.Qg7+ Rf7 36.Qxg6 seems to win (36... Rf6 37.Rh7+ wins material; 36... Qd5(6) 37.Rh6).

Perhaps I'm missing a quicker alternative.

Dec-24-17  Patriot: <agb2002> No problem--I'm surprised you found my post!

I think your analysis looks good!

I was curious how we did so I checked with Crafty and it likes 31.Rg4 g6 but instead of 32.Rh4, it likes 32.Rxg6 Rxg6 33.Qxg6 d6 34.Re3 Qe8 35.Rxe8+ etc. although 32.Rh4 is also winning.

Dec-24-17
Premium Chessgames Member
  agb2002: <Patriot: <agb2002> No problem--I'm surprised you found my post!>

I often search for <agb> and <agb2002> to see whether someone found problems with my analyses, alternatives, interesting comments, etc.

<I think your analysis looks good!>

Thank you!

<I was curious how we did so I checked with Crafty and it likes 31.Rg4 g6 but instead of 32.Rh4, it likes 32.Rxg6 Rxg6 33.Qxg6 d6 34.Re3 Qe8 35.Rxe8+ etc. although 32.Rh4 is also winning.>

My daughter would say that optimal moves are overrated...

Dec-25-17  Patriot: <agb2002> <My daughter would say that optimal moves are overrated...> Your daughter must be very smart because she is right! Merry Christmas!
Dec-25-17
Premium Chessgames Member
  agb2002: <Patriot> Thank you and Merry Christmas!
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