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Alex Sherzer vs Sergey Kudrin
13th World Open (1985), Philadelphia, PA USA, Jul-??
Sicilian Defense: Dragon Variation. Yugoslav Attack (B77)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
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Mar-10-16
Premium Chessgames Member
  Penguincw: Thursday puzzle, entering today 3/3.

Damn, nearly got it! I got 24.Rxh7+ Kxh7 25.Rh1+. At this point, I went for 25...Kg8 26.Ne7++ 1-0 (double check and mate). 26.Nf6++ 1-0 works as well.

However, black here played 25...Kg6. While I didn't consider that in my calculation, I'm not sure if I would've seen the rest of the moves OTB.

Mar-10-16  diagonalley: 24.RxN+ is an absolute must! ... easy for a thursday :-)
Mar-10-16  dfcx: white is already up an exchange with B+P for a rook. But the material count does not matter as much here, as white hunts down the king.

24.Rxh7+ Kxh7 (Kg8?? 25.Nxf6#) 25.Rh1+ Kg6 26.f5+ (not Q+ as black plays f5) Kxf5 27.Ne3+ Kg6 28.Qxg6 Kf7 29.e6+ Kg8 30.Bh6 Rf7 31.Qg6 and mates in two.

Mar-10-16  stacase: <diagonalley: 24.RxN+ is an absolute must! ... easy for a thursday :-)>

Pretty much my thoughts, but like Penguincw I don't know that I could have concluded the merry chase that ensued with a win. Great positions can sometimes evaporate.

Mar-10-16  FlashinthePan: After 30.Bh6, Black has only 30...Rf7 and now the zwischenzug of 31.Qg6! before 31.exf7 (allowing 31...Kxf7 then 32.Qxg7 Ke6 and avoids immediate mate) is crushing.
Mar-10-16  Lowie: <Shadout Mapes: Here's a nice game with a humorous ending.> Funny too, that after 20...Bf6 the bishop stays en prise for 10 moves. And when he finally does move, it is to end the game.
Mar-10-16  gofer: Well lets start at the very beginning, its a very good place to start...

<24 Rxh7+ ...>

24 ... Kg8
25 Nxf6#

<24 ... Kxh7>
<25 Rh1+ ...>

25 ... Kg8
26 Nxf6#

<25 ... Kg6>
<26 f5+ ...>

26 ... Kxg5
27 Qf4#

26 ... Kf7
27 Nxf6+! d5 (e6 Qxe6#)
28 e6#

<26 ... Kxf5>
<27 Ne3+ ...>

28 ... Kxe5
29 Qd5#

28 ... Kxg5
29 Qxg4#

<27 ... Kg6>
<28 Qxg4 ...>

White threatens Bh6+ mating and Qf5+ mating and Qh5#!

<28 ... Kf7>
<29 e6+ Kg8>
<30 Bh6 Rf7>
<31 Nf5 > mating!


click for larger view

The only other attempt at defence for black is to try to create some "luft", by giving up a bishop, but this fails to actually work though it does make the mate a little trickier, but in some ways it is even nicer!

<25 ... Bh5!>
<26 Rxh5+ Kg6>
<27 f5+! ...>

27 ... Kf7
28 Nxf6+ mating as given above

27 ... Kxh5
28 Ne3! ...

White threatens Qxg4# but mate is unavoidable...

29 ... Kxg5
30 Qxg4+ Kh6
31 Qg6#/Qh4#!

29 ... fxg5
30 Qxg4+ Kh6
31 Qh3#!

<27 ... Kxf5>
<28 Bh6+! ...>


click for larger view

28 ... Kg6
29 Qxg4+ Kf7
30 e6+! Ke8
31 Qg6+ Rf7
32 Qxf7#

28 ... Ke6
29 Nf4+ Kd7
30 e6+ Ke8
31 Qb5+ Qd7
32 Qxd7#

~~~

Yep... BUT, lots to see and plenty of choices. Very nice POTD !!!

Mar-10-16  WorstPlayerEver: I can't take this game any seriously.
White plays Bc4-Bb3-Bc4 to finally get uh Black rook on c4 (RxB). That's just too ridiculous!
Mar-10-16  morfishine: <24.Rxh7+> Yada, Yada, Yada...
Mar-10-16
Premium Chessgames Member
  Dionysius1: Ah now that is a heartlift! Talk about a mating net. I particularly like 27. Ne3+ when black can't make either of the legal captures, and 28.Qxg4. Not even a check but the threat of Qh5 is lovely/horrible.
Mar-10-16  CHESSTTCAMPS: Not only does white have the material advantage of an exchange for a pawn, but the black king is very exposed. With both the bishop and Rh5 en prise, white can commit to the forcing exchange sacrifice without thinking twice.

24.Rxh7+! initiates a king hunt, pretty much forced anyway. 24... Kxh7 (Kg8 25.Nxf6#) 25.Rh1+ Kg6 (Bh6 26.Bxh6 is winning) 26.f5+! and now:

A.26... Kxg5 27.Qf4#

B.26... Kxf5 27.Ne3+ Kg6 28.Qxg4! Kf7 (fxg5 29.Qh5#) 29.e6+ Kg8 30.Bh6 wins

B.1 27... Kxg5 28.Qxg4#

B.2 27... Kxe5 28.Qf4#

C.26... Kf7 27.Nxf6+ d5 (e6 28.Qxe6#) 28.Nxd5 and the panoply of threats (Nxe7+, Bxe7, Qxg4) is overwhelming.

Mar-10-16
Premium Chessgames Member
  agb2002: White has a rook for a bishop and a pawn.

Black threatens 24... Bxh5 and 24... fxg5.

White can expose the black king with 24.Rxh5+ Kxh7 (24... Kg8 25.Nxf6#) 25.Rh1+:

A) 25... Kg6 26.f5+

A.1) 26... Kxg5 27.Qf4#.

A.2) 26... Kxf5 27.Ne3+ Kg6 (27... Kxg5 28.Qxg4#; 27... Kxe5 28.Qd5#) 28.Qxg4

A.2.a) 28... fxg5 (or 28... f5) 29.Qh5#.

A.2.b) 28... Rh8 29.Bxf6+ Kf7 30.e6+ Kf(g)8 31.Qxg7#.

A.2.c) 28... Kf7 29.e6+ Kg8 30.Bh6 and mate in three.

A.2.d) 28... Bh8 29.Bxf6+ Kf7 30.e6#.

A.2.e) 28... Rg8 29.Bxf6+ Kf7 30.e6+ Kf8 31.Bxg7+ Rxg7 32.Rh8+ Rg8 33.Q(R)xg8#.

A.3) 26... Kf7 27.e6+ Kg8 28.Bd2 and Black is helpless against Qxg4, Rg1, etc.

B) 25... Kg8 26.Nxf6#.

C) 25... Bh5 26.Rxh5+ Kg6 27.Qd3+ f5 (27... Kxh5 28.Qh7+ Bh6 29.Qxh6#; 27... Kf7 28.Bh4 + - [N vs P]) 28.Rh4 + - [N vs P].

D) 25... Bh6 26.Bxh6 just loses a piece.

Mar-10-16
Premium Chessgames Member
  patzer2: Today's Thursday puzzle reminded me of the Carole King song "You're so far away" with the lyric "Doesn't help to know you're just time away."

Got as far as 24. Rxh7+! Kxh7 25. Rh1+ Kg6 26.f5+ Kxf5 27. Ne3+ Kg6 in my calculation, but did not see enough ahead in this King Hunt to realize that 28. Qxg4! (diagram below) forces mate-in-five (Deep Fritz 15 @ 25 depth):


click for larger view

Here (diagram above) after 28. Qxg4!:

If 28...fxg4?, then 29. Qh4#.

If 28... Rh8, then 29. Bh6+ Kf7 30. e6+ Kf8 31. Qxg7#.

If 28...Kf7, as in the game continuation, then the mate-in-five goes 29. e6+ Kg8 30. Bh6 where Black resigns in lieu of 30...Rf7 31. Qg6 Bc6 (31...d5 32. exf7+ Bxf7 33. Qxg7#) 32. Qxf7+ Kh7 33. Qxg7#.

In looking for a Black improvement, the computer suggestion 18...Rxc3! looks much better than 18...Rxc4 =.

After 18...Rxc3! (diagram below),


click for larger view

Deep Fritz 15 indicates play (diagram above) might go 19. Qxc3 Nxg5 20. hxg5 dxe5 21. fxe5 Qb8 22. Qe3 Qxe5 23. Rhe1 Qxe3+ 24. Rxe3 Re8 25. Ne2 Bc8 (-0.83 @ 20 depth) with two pawns for the exchange and an advantage for the second player.

Mar-10-16  Eduardo Leon: I haven't consulted with an engine, or even used a physical chessboad to check the following lines, so this analysis might be flawed. The main line is highlighted.

<24.♖xh7+ ♔xh7 25.♖h1+ ♔g6 26.f5+! ♔xf5>

26...♔xg5 27.♕f4#, 26...♔f7 27.♘xf6+ d5 28.e6#.

<27.♘e3+ ♔g6>

27...♔xg5 28.♕xg4#, 27...♔xe5 28.♗f4#.

<28.♕xg4! fxg5>

28...♔f7 29.e6+ ♔g8 30.♗h6.

<29.♕e6+ ♖f6>

29...♗f6 30.♕f5+ ♔f7 31.e6+ ♔g7 32.♕h7#.

<30.exf6 exf6>

30...♗xf6 31.♕g8+ ♗g7 32.♖h7.

<31.♕g8 ♕e7 32.♕h7+ ♔f7 33.♘f5 ♕f8 34.♖e1>

And there's no way to stop both threats 35.♘xg7 ♕xg7 36.♖e7+ and 36.♕xg7+ ♔xg7 37.♖xe8.

Mar-10-16
Premium Chessgames Member
  kevin86: The king is forced out in the open by a sacrificial rook.
Mar-10-16  YetAnotherAmateur: 24. Rxh7+ is the obvious place to start.

24. ... Kxh7
25. Rh1+ Kg6 (Kg8? 26. Nxf6# or Nxe7# due to double-check) 26. f5+ Kxf5 (Kf7? 27. Nf4+ e6 28. Qxe6#)
27. Ne3+ Kg6 (Kxe5 28. Qd5#, Kxg5 28. Qxf4#)
Now this is where things get a bit trickier, because white can no longer succeed by simply playing checks. Most of those ideas are met with f5, which stops a lot of the lines of attack on the king.

28. Qxg4 (threatening Qh5#)

A) 28. ... Kf7
29. e6+ Kg8
30. Bh6 and now it's completely hopeless for black.

B) 28. ... Bh6
29. Qh5+ Kg7
30. Bxh6+ Kg8
31. Rg1+ and again there's little for black to do but throw in the towel.

Mar-10-16  schachfuchs: The whole game was a very clear, stringent execution by Sherzer!

@Eduardo In my calculations, I prefered 29.Qh5+ after a short look at 29.Qe6+ ;-)

@Patzer Thanks for great move 18...Rxc3! that changes things completely!

Mar-10-16
Premium Chessgames Member
  whiteshark: Got it in the second running. <27.Ne3+!> was the hardest move to find.
Mar-10-16  Eduardo Leon: <schachfuchs> D'oh! I knew I was missing something. Thanks.
Mar-10-16  scholes: After 27 kg6 i gave up. seemed too long for thursday
Mar-10-16  stst: The inviting initiative is RxB+, else White's R is under attack and other moves loses momentum. So try

24.RxB+ KxR (if
(A) ..... Kg8 will get it into a mating net:
25.Nxf6 dbl+ Kg7
26.Rh7 Kg6
27.Qe4#)
(B)28.Rh1+ (B-i) Kg6
26.f5+ Kxf5
27.Ne3+ Kg6 (if ..... KxB, 28.QxP#)
28.Qxg4 Kf7
29.e6+ Kg8
30.Qh4 and no defense to Qh7#

(B-ii)
25.......... Bh6
26.RxB+ Kg7
27.f5 fxg5
28.Re6 Rxf5
29.Qxg4 Rf8
30.Qxg5+ Kh8
(else if .... Kf7, 31.Qg6#)
31.Rh6#

see if the game proceeds in other lines...

Mar-10-16  dehanne: sac, sac, sac, mate

Dragon variation in a nutshell.

Mar-10-16  Cheapo by the Dozen: What I missed was that on

26 ... Kf7
27 Nxf6+

White's knight is covering g8, and hence 27 ... d5 allows 28 e6#

So I didn't bother calculating out the lines after Black's other 26th move possibilities either.

I like to think I've have played the correct line over the board, given the chance; at the point where I got stuck, White is down a pawn but has a raging attack.

Mar-11-16  saturn2: with RxN 23..Be8 white was begging for RxNh7, so I would have fulfilled him this wish. Then instead of playing immediatly Rh1+ I went for e6, hampering the black position but offering the bishop on g5. After this there is Qf5+ or Rh1+. I dont have a computer but I think black is als lost in this way.
Nov-09-16  clement41: Crushing attack.
I reckon this h4 h5, Bg5 Rc5 line was pionneered by Soltis but I may be wrong
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