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Larry Evans vs Arthur Bisguier
US Championship (1958/59), New York, NY USA, rd 9, Dec-30
Russian Game: Kaufmann Attack (C42)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
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Oct-01-08
Premium Chessgames Member
  Once: constraints

A check, a cross pin, two discovered attacks, a queen sacrifice, an x-ray attack and a back rank mate.

Ain't chess great?

Oct-01-08  SimSim314: Missed Bc6. But After 27. Qxe7+ Kxe7 28. Bxh7+ white are pawn up.

Oct-01-08
Premium Chessgames Member
  TheaN: 3/3

This was seconds work... strange, because Bc6 is not as obvious.

<26.?>

White: a2, f2, g2, h2, Be4, Rd1, Qa7, Kg1

Black: b6, f7, g7, h7, Be8, Rh8, Qe6, Kf8

Candidates: Qa3†

-ML-
To find the correct idea here: well, actually, just do: with the threat of Qxe1‡, White cannot move his Bishop. Moving the Rook could leave the Bishop en prise and is probably a useless move: no, the Queen has to get back in. That that happens with a fatal check is something different.

<26.Qa3†> although in general a useful move, it puts Black with two seemingly decent replies and one blunder, but neither three work.

/A\
<26....Qd6 27.Qxd6† Kg8 28.Qe7 g6 29.Qxe8† > and mate somewhere very soon: just giving away the Queen is pointless.

/B\
<26....Qe7> seems to be the best reply, but Black's bank rank breaks him apart.

<27.Bc6!> nice. Qe7 is pinned to Qa3, and with the Rook's power on the e-file, Black's replies are useless.

/BA\
<27....Qxa3 28.Rxe8‡ 1-0>

/BB\
<27....Bxc6 28.Qxe7† Kg8 29.Qd8† Be8 30.Rxe8‡ 1-0>

/BC\
<27....g6 28.Qxe7† Kg7 29.Bxe8 > not very helpful either: it avoids immediate mate, though.

/C\
<26....Kg8> normal a blunder of a move: Black is avoiding the discovery by keeping his King on black squares, but now he has to go to a checking white square forced.

<27.Bxh7†>

/CA\
<27....Rxh7> keeping the King on the back rank, but avoiding some clear pawn loss: in the end it actually loses the piece or Rook to it.

<28.Rxe6 fxe6 29.Qe7!> and Black is in quite some trouble for keeping his King on the back rank.

/CAA\
<29....Bf7 30.Qd8† Be8 31.Qxe8‡ 1-0>

/CAB\
<29....Ba4 30.Qxe6† Kf8 31.Qf5† > and the Rook falls.

/CAC\
<29....Rh6 30.Qxe8† >

/CB\
<27....Kxh7> clearing the Rook's way, but it does lead to a two pawn loss forced.

<28.Rxe6 fxe6 29.Qh3† Kg8 30.Qxe6† Kf8 31.Qxb6 > and White should be able to win it relatively easy.

Oct-01-08
Premium Chessgames Member
  TheaN: <zenpharaohs
27 Qa3+ Kg8
28 Bxh7+ Kxh7
<29 Qd3+?!> Bg6
30 Qh3+ Kg8
31 Qb3 Rh4
32 Qxb6 Rc4
33 h3>

? on what depth was it thinking? It seems to me that <29.Qh3† Kg8 30.Qxe6† Kf8 31.Qxb6> is completely forced and winning easily...

Oct-01-08  VooDooMoves: White has a discovered attack, however it doesn't work at this moment because the bishop is pinned to the rook. To make it work the bishop move needs to be forcing i.e. a check. Since the black king is on a dark square we need him to move. One candidate comes to mind: 26. Qa3+

1) 26. Qa3+ and now black has two responses

A) 26...Kg8 27. Bxh7+ K/Rxh7 28. Rxe6 and white wins queen for bishop & rook

B) 26...Qe7 27. Bc6 ! and now white threatens mate THROUGH the black queen.

B1) 27...Qxa3 28. Rxe8#

B2) 27...Bxc6 28. Qxe7+ Kg8 29. Qe8+ Bxe8 30. Rxe8#

Oct-01-08  karnak64: <Once: constraints

A check, a cross pin, two discovered attacks, a queen sacrifice, an x-ray attack and a back rank mate.

Ain't chess great?>

This really is an amazing position!

Oct-01-08  kirchhoff: I agree with <zenpharaohs:> and <tcfix:>. I saw 26. Qa3+ Kg8 27. Bxh7+ Kxh7
28. Rxe6 leading to a Queen and pawn or two versus the Bishop and Rook, but felt that there was still play here for Black. I spent some time trying to see if I could capture Black's b pawn but reachd the end of my capabilities. Nice to see that Rybka went down this same path.
Oct-01-08  Woody Wood Pusher: 26.Qa3+, Kg8 27. Bxh7+, Kxh7 28.Rxe6,fxe6 29.Qb3 was my line, then 29..b5 30.Qxe6 leaves Q+4P against R+B+2P

however, the Rybka line seems stronger (surprising lol) picking up the b-pawn.

Oct-01-08  eblunt: <lost in space: 26. Qa3+ is the winning move.

A. 26...Kg8 27. Bxh7+ Rxh7 28. Rxe6 fxe6. White is the equivalent of 2 pawns up. Should be enough to win>

Then 29 ♕e7 ♗ moves 30 ♕xe6+ and ♕xb6 White is 4 pawns up, and even I could win it OTB from there

Oct-01-08
Premium Chessgames Member
  chrisowen: Good 'evans bit 'andy that black played Kf8. Without making a song and dance about it isnt Be6 worth a plug?
Oct-01-08
Premium Chessgames Member
  whiteshark: 26.Qa3 Kg8 (if 26...Qe7 27.Bc6! Qxa3 28.Rxe8#) 27.Bxh7+ Rxh7 28.Rxe6 fxe6 29.Qe7

3/3 as usual. Go Thursday, challenge me!

Oct-01-08  Samagonka: No big deal in getting this one. Too straight forward.
Oct-01-08  newzild: 26.Qa3

If 27...Kg7 then 38.Bxh7+ wins the queen.

If 27...Qe7 then 28.Bc6! wins as the queen is in a two-way pin.

Nice.

3/3 this week. Or is it 4/4 now?

Oct-01-08
Premium Chessgames Member
  TheDestruktor: Hey, 5.c4 against the Petroff? I will take a closer look at this.
Oct-01-08
Premium Chessgames Member
  johnlspouge: Wednesday (Medium/Easy)

H Evans vs Bisguier, 1959 (26.?)

White to play and win.

Material: Even. Both Ks are vulnerable to back-rank mates. The White Re1 behind Be4 exerts pressure on Qe6 and Bd8, raising the possibility of discovered attacks. The Qa7 is active, both horizontally on the 7-th rank and vertically on the a-file, with a check Qa3+.

Candidates (26.): Qa3+

26.Qa3+ Kg8 [Qe7 27.Bc6 wins Qe7 or mates]

27.Bh7+ Kxh7 [or Rxh7] 28.Rxe6 fxe6

White has Q+P for R+B. The rest is technique.

Oct-01-08
Premium Chessgames Member
  agb2002: Black is not very armonically developed and the king is somewhat exposed. White's back rank deserves attention.

A) 26.Qa3+
A.1) 26... Qe7 27.Bc6 winning
A.2) 26... Kg8 27.Bxh7+ winning

I don't see anything stronger. Time to post and check.

Oct-01-08  desiobu: Most of the candidates jump out but the key was getting the moves in the right order.
Oct-01-08
Premium Chessgames Member
  DarthStapler: Got it
Oct-01-08
Premium Chessgames Member
  sleepyirv: Very nice puzzle. Black has no move to save his queen. Good week for me so far.
Oct-01-08  TheCap: yes! 3/3 so far
Oct-01-08  bunkerputt: 26. Qa3+ Qe7 27. Bc6 was easy to see, as well as 26...Kg8 Bxh7+ and Rxe6. What was a little trickier was evaluating how easy the Q vs R+B endgame would be for white. These are notoriously difficult to convert in my experience. I think because of the extra pawn and the multiple black pawn weaknesses, creating a defensive fortress is impossible from the black perspective, though. So the win shouldn't be too technical. I looked for something better than Qa3+, but not finding anything, went ahead and chose it. The line I'm expecting would be 26. Qa3+ Kg8 27. Bxh7+ Rxh7 (Not 27...Kxh7 28. Rxe6 fxe6 29. Qh3+ Kg6 30. Qxe6+ and with Qxb6 white mops up the pawns) 28. Qd6 Kf7 29. Qxb6 when the a-pawn is a decisive asset.
Oct-01-08  bunkerputt: <VooDooMoves 29. Qe8+ Bxe8 30. Rxe8#> So flashy... 29. Qd8+ Be8 30. Qxe8# saves the queen and mates too. In this case, it doesn't matter, but as a practical decision, I've avoided catastrophe by not giving up material unnecessarily during a combination that halfway into turns out not to work on more than one occasion in my lifetime.
Oct-01-08
Premium Chessgames Member
  chrisowen: <isnt Be6 worth a plug?> i tried this one thinking it is 14. Qxb2?! and black can 0-0, however there is cxd5.
Oct-01-08
Premium Chessgames Member
  YouRang: A very nice puzzle! Our light-square bishop on e4 is clearly the key. Does the black queen have it pinned to our rook, or can it unleash a discovered attack on the black queen?

Opting for the latter, the only useful way to unpin the bishop is to pin the black queen, and such a pin could only come from our queen via the a3-f8 diagonal, and so 26.Qa3+ it is. Clearly black cannot play 26...Kg8, since that puts his king on a light square enabling 27.Bxh7+ & winning the queen.

That leaves black with 26...Qe7, which blocks the check but also pins the queen -- an UNPINs our bishop. Now the very pretty, but not hard to see, finish is 27.Bc6!, a discovered attack on the queen.

Really, the queen is now pinned in two directions: (1) to the king and (2) to the Be8 since moving in along the a3-f8 diagonal (such as 27...Qxa3) allows 28.Rxe8#.

Oct-01-08
Premium Chessgames Member
  Jimfromprovidence: This is the position after 25 Qxa7.


click for larger view

Instead of the text 25...b6, I found it instructive to ascertain the impact of the three pawn moves 25...f6, 25...g6, or 25...h6. The results surprised me.

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