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Manuel Rivas Pastor vs Andrew Jonathan Mestel
Marbella Zonal Group B (1982), Marbella ESP, rd 10, Feb-18
King's Indian Defense: Saemisch Variation. Panno (E84)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Aug-20-15
Premium Chessgames Member
  agb2002: White has a knight for a rook.

Black threatens 26... Rxg5.

The white rook x-rays the black king. The knight can control the escape square g8 from e7. These details lead to consider the combination 26.Bxg6 fxg6 27.Ne7. Hence, 26.Bxg6+:

A) 26... fxg6 27.Ne7

A.1) 27... Rxg5 28.hxg5#.

A.2) 27... Qe8 28.h5

A.2.a) 28... gxh5 29.Qg7#.

A.2.b) 28... Rxg5 29.hxg6#.

A.2.c) 28... Rxe7 29.hxg6+ Kg8 30.fxe7 and Black is defenseless against 31.Qf(h)6.

A.2.d) 28... Qxe7 29.hxg6+ Kg8 30.fxe7 Rxg5 31.e8=Q+ Kg7 32.Qf7#.

A.3) 27... Rxe7 28.fxe7

A.3.a) 28... Qe8 29.h5 Kg8 (29... gxh5 30.Qg7#) 30.hxg6 transposes A.2.c.

A.3.b) 28... Qg8 29.h5 and the threat 30.hxg6# wins (29... gxh5 30.Rxh5#).

A.3.c) 28... Qd7 29.h5 wins (29... Qg4 30.hxg6+ Kg7 31.Rh7+ Kg8 32.e8=Q#).

A.4) 27... Qxe7 28.fxe7

A.4.a) 28... Rxg5 29.hxg5+ Kg7 30.e8=Q wins.

A.4.b) 28... Rb7 29.Qxe5 dxe5 30.e8=Q wins.

A.4.c) 28... Bd7 29.Qf6 + - [Q+P vs R+B] and many threats (Qf7+ followed by Qf8+, Qxd6, Rf1, Rg1, h5, etc.).

A.5) 27... Qf8 28.Qxg6+ Kh8 29.h5

A.5.a) 29... Be6 30.h6 with the threat 31.Qg7+ Qxg7 32.hxg7# wins.

A.5.b) 29... Rxe7 30.fxe7 Qxe7 31.Rg1 Bf5 (31... Bd7(e6) 32.Qh6+ Qh7 33.Qf6+ Qg7 34.Qxg7#) 32.exf5 and the game ends with Black's spite checks.

A.6) 27... Bf5 28.exf5 looks crushing.

B) 26... Kg8 27.Bh7+ Kf8 (else 28.Qg7#) 28.Qg8#.

C) 26... Kh8 27.Qh6+ Kg8 28.Qg7#.

Aug-20-15  saturn2: Seeing 26 Ne7 after a while I had an eureka experience: The king is locked on the h file and will die after white's opening the h file. I considered the puzzle solved at this moment.

However I did not think of the resacrifice of black's queen.

<dfcxA.26...Rxg5 27.hxg5 and black can only avoid mate by giving the queen back 27...Qxe7 (otherwise Bxg6#) 28.fxe7 Be6>.

What happens after 28..Bd7 instead of Be6?
Does not this stop the threat of white's e pawn queening?

Aug-20-15
Premium Chessgames Member
  agb2002: I've just applied for the 26.Bxg6+ club.
Aug-20-15  morfishine: Oddly, usually a Thurs POTD is easier than a Wed POTD for me, but not today. The only reason I finally found <26.Ne7> was its the only move that leads to a common, identifiable pattern [ie: Anastasia with Knight on e7 conveniently covering g8 & g6 and the attack coming down the h-file]. True, its not a "pure" Anastasia with the Q-sac on h7, but the pattern/theme remains the same

I pondered 26.Bxg6 for awhile before abandoning it

*****

Aug-20-15  ndg2: Immediate 26.Ne7 is better than 26.Bxg6+ (what I would have played) because after 26..fxg 27.Ne7 Qg8 white must use a tempo to avoid Qc4+ with perpetual. After 28.Kd2 white is still better but it's not as clear as in the game.
Aug-20-15  awfulhangover: I am a not that proud member of the 26.Bxg6 club.
Aug-20-15  Nick46: <diagonalley: wow! .."medium"(?!) ...no way... this one was hard.> too right!
Aug-20-15  wooden nickel: A couple of moves earlier and Black was still doing fine... White to play 23.?


click for larger view

23.Bxh5 seems to lead to nice play after the nasty fork on the rooks but is it solid? After 23... Nxh1 and 24.Rxh1, the logical looking move 24... Re8 seems to even lose! Like yesterday, it's a matter of deciding between 2 attractive moves 26.Bxg6 vs 26.Ne7, both full of mating threats.

Aug-20-15  CHESSTTCAMPS: White is down an exchange and appears to be in a mess with the attacking queen being skewered by the black rook. After 26. Q moves Rxh5 leaves black a rook up and the king position safely locked down. But who says the queen has to move?

26.Ne7!

traps the black king on the h-file and threatens 27.Bxg6+ forcing mate. Now none of black's available captures leaves a satisfactory defense:

A) 26... gxh5 27.Qg7#

B) 26... Rxg5 27.hxg5 Qxe7 29.fxe7 Be6 (or Bb7 or Bf5 meets same response) 30.Bd1+! Kg7 31.Ba4 and black can't stop 32.e8=Q winning the rook.

B.1) 27... gxh5 28.Rxh5#

B.2) 27... Bh3 28.Bxg6+ fxg6 29.Rxh3#

B.3) 27... other 28.Bxg6#

C) 26... Rxe7 27.fxe7 Qe8 28.Bxg6+ fxg6 29.h5 Kg7(|g8) 30.hxg6 followed by 31.Qh6 forcing mate.

C.1) 27... Qg8 28.Bd1 (threatening Ba4) Bd7 29.h5 Kg7 30.hg wins.

D) 26... Qe8|f8 27.Bxg6+! fxg6 28.h5! Rxg5 29.hxg6#

D.1) 27... Qxe7 28.hxg6+ Kg8 29.fxe7 wins.

E) 26... Qg8 27.Bd1! and black can't stop h5 (27... Rxg5 28.hxg5#

F) 26... Bf5 27.exf5 wins

G) 26... other 27.Bxg6+ fxg6 28.Qxg6+ Kh8 29.Qh6#

Time for review....

Aug-20-15  patzer2: <White resigns in lieu of 28...Qh7 29. Qf8+ Qg8 30. Qxg8#.> Oops! That should be "Black resigns" in lieu of 28...Qh7 29. Qf8+ Qg8 30. Qxg8#.
Aug-20-15  dfcx: <saturn2, ... What happens after 28..Bd7 instead of Be6? >

28... Bd7 29. Bg4+ gets the bishop

Aug-20-15
Premium Chessgames Member
  Tiggler: Very pleased to have found this one. Not at all obvious to me.
Aug-20-15
Premium Chessgames Member
  Tiggler: The h1 R plays a sinister role in this, while appearing to be a bystander during the final moves.
Aug-20-15  patzer2: An interesting position occurs after 26... Rxg5 26...Rxg5 27. hxg5 Qxe7 (Not 27... gxh5?? 28. Rxh5#) 28. fxe7 Bh3!?


click for larger view

Here 29. Rxh3? lets Black back in the game after 29...gxh5 30. Rxh5+ Kg6 31. Rh6+ (+0.72 @ 28 depth, Deep Fritz 14).

Instead, 29. Bd1 (best move in diagram above) wins the pinned Bishop with decisive advantage, illustrating <Tiggler's> point about the <sinsister role> of the h1 Rook.

Aug-20-15  BOSTER: < paltzer2: Clearly 26.Bxg6+ is not as strong as 26.Ne7>. Finally your Fritz lost.
After 26.Bxg6+ fxg6 27.Ne7 Qg8
28.h5!! this is main idea of combo -double chrck.


click for larger view

Aug-20-15  BOSTER: Even you have Qc4+ which I did not count.
Aug-20-15
Premium Chessgames Member
  kevin86: I think I saw this one. the two discovered attacks follow the queen's capture. If the queen is not taken,black will lose quickly anyway.
Aug-20-15  saturn2: <dfcx 28... Bd7 29. Bg4+ gets the bishop> Yes thanks. I was mislead by your first diagram where the king is already on g7 and a bishop move is no discovered check.
Aug-20-15
Premium Chessgames Member
  Jimfromprovidence: <BOSTER> <After 26.Bxg6+ fxg6 27.Ne7 Qg8 28.h5!! this is main idea of combo -double chrck.>

Unfortunately, black has 28...Qc4+.


click for larger view

Aug-20-15  CHESSTTCAMPS: <<Jimfromprovidence:> Unfortunately, black has 28...Qc4+. > Exactly the reason that I separated line E from line D in my analysis, although I was somewhat surprised that 26... Qg8 turned out to be the game defense.
Aug-20-15  patzer2: <Boster><Jimfromprovidence> Thanks for looking into 26.Bxg6+ fxg6 27.Ne7 Qg8 28.h5!? Qc4+ = which Fritz indicates leads to a draw by perpetual check.

White may be able to win the pawn up endgame which occurs after 26. Bxg6+ (i.e. see Fritz analysis posted earlier), but that still leaves 26. Ne7! as White's strongest and quickest winning move.

Aug-20-15  ehins: not neccessarily a straight forward win for White.If 26 Ne7 Rxg5 27hxg5 Qxe7 28fxe7 Be6 29Bd1+ Kg8.how does White win?
Aug-20-15  BOSTER: In any kind of sport some players like the <beauty>, some result ( money, or points).
Aug-20-15  ehins: Following from my analysis,Just saw 30 Ba4 and white goes on to win
Aug-20-15  BOSTER: In the pos. 28. h5 Qc4 Fritz has to ask draw.
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