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Larry Mark Christiansen vs Javier Benito Campos-Moreno
Chess Olympiad (1980), Valletta MLT, rd 2, Nov-21
Queen's Indian Defense: Spassky System (E14)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Sep-26-04  ConLaMismaMano: What was the main error? Maybe instead of 18...b5, could g6 be better?
Jun-27-14  SimonWebbsTiger: a case of "storming the barricades", <Big Larry C> style, with a "ROVER" a la St. Louis style.

The "official" annotations to help solvers.

<20. Nd7>

<a> 20...Nxd7 21. Bxh7 Kh8 22. Bg6 Kg8 23. Rh8 Kxh8 24. Qh5

<b> 20...Nf4 21. Qc2 Nxh3 22. gxh3 Be4 23. Nxf6 Bxf6 24. Qxe4 g6 25. Ne5

<20...Qc7 21. Bxh7 1-0>

If 21...Nxh7 22. Qh5; 21...Kh8 22. Bb1 Kg8 23. Nxf6 Nxf6 24. Bh7 Kh8 25. d5 g6 26. Bxg6 Kg7 27. Rh7 Kxg6 28. Qd3

(Byrne, Mednis)

Jun-27-14
Premium Chessgames Member
  Cheapo by the Dozen: I'm starting out stumped. White doesn't have much of an attack unless he can get rid of the f6 knight, which has an outpost knight defending it. The one promising approach I see is 20 Nd7, because

20 Nd7 Nxd7
21 Bxh7+ Kh8
22 Bb1+ Kg7
23 Qh5

wins via the unstoppable threat of Qh8+.

But if Black declines his knight, it's hard for White to just snatch the exchange, because Black has his own fork with ... Nf4, as in:

20 Nd7 Qc7
21 Nxf8 Nf4

So what I'd play over the board is

20 Nd7 Qc7
21 Nxf6+ Nxf6
22 Ne5

I like this position for White, Black's various open lines notwithstanding, but I hardly feel I've solved the puzzle.

Jun-27-14
Premium Chessgames Member
  al wazir: White can play 20. Nd7, forking ♕ and ♖ , but black can fork right back with Nf4. But so what? 21. Qc2 Nxh3+ 22. gxh3, and now if black plays 22...Qc7, white has 23. Nxf6+ and Qxh7#. Black must play 22...Rd8, giving up his ♕ for ♖+♘.
Jun-27-14  M.Hassan: "Difficult"
White to play 20.?
Sides are equal

At first I tempted to go for 20.Bxh7+ but dropped it out soon as being immatured and there were no results, instead I thought to deviate the supporter of h7 square, i.e Nf6

20.Nd7 Nxd7
21.Bxh7+ Kh8
22.Bf5!+ Kg8
23.Qh5
Threatening mate on h7 or h8
<23...N7f6 Qh8#>
<23...f6 opening an escape square for the King 24.Bxe6+ Rf7 25.Qxf7#

I saw another line of solution:
Line 2
20.Nf7 Nf4 Forking Queen & Rook
21.Qc2 threatening mate on h7
21.........Nxh3+
22.gxh3 g6
23.Nxb8
Time to check
=============
Why Black resigned after 21.Bxh7?

Jun-27-14  M.Hassan: 21.Bxh7+ Nxh7
22.Qc2 Ndf6
Black can defend and can continue playing. Am I correct?. Appreciate comments
Jun-27-14
Premium Chessgames Member
  Marius: Hassan; 22. Qh5, target is h8 not h7 which knight could hve protected
Jun-27-14
Premium Chessgames Member
  al wazir: <M.Hassan: 21.Bxh7+ Nxh7 22.Qc2 Ndf6. Black can defend and can continue playing. Am I correct?> No: 22. Qh5 Ndf6 23. Nxf6+, followed by 24. Qxh7# or 24. Qh8#.
Jun-27-14
Premium Chessgames Member
  pawn to QB4: <20.Nd7 Nxd7
21.Bxh7+ Kh8
22.Bf5!+ Kg8
23.Qh5 >
also, in this line not 23. Qh5 but 23. Rh8+, 24. Qh5+ and mate on h7.
Jun-27-14
Premium Chessgames Member
  morfishine: <20.Nd7>
Jun-27-14  Balmo: All hail Larry Christiansen, King of the cheapos! Great tactical player.
Jun-27-14
Premium Chessgames Member
  Penguincw: I got 21.Nd7+ with 22.Bxh7+ to follow, so good enough for me. :)
Jun-27-14  Eduardo Leon: 20.♗xh7+ fails to 20...♘xh7 21.♕h5 ♘df6. We have no way to dislodge the ♘d5, but we do have...

<20.♘d7 ♕(any) 21.♗xh7+ ♘xh7 22.♕h5 ♘df6 23.♘xf6+>

Game over.

Jun-27-14  sombreronegro: Black's two most important pieces are the queen materially and the knight on f6 positionally.

20 Nd7 forks those pieces. B X h7+ and a discovered check to open the h file? Looks too easy for a Friday.

Time to receive correction as needed...

Ah really? This is a Tuesday puzzle. Yes I got it but too easy for Friday IMHO

Jun-27-14
Premium Chessgames Member
  Oxspawn: I started with
20. Nxf7 and things went downhill from there.
Playing the game out, as described by <SimonWebb'sTiger> I was struck by the way that after 20. Nxd7, the white bishop, rook and queen conduct a stately dance with the King (who gavottes between h8 and g8) before the queen discomforts him on h7. It is a kind of ceremonial execution. No wonder black resigned. And no, <sombreronegro>, this is not a Tuesday puzzle. I can do Tuesday puzzles. I can only observe Friday puzzles.
Jun-27-14
Premium Chessgames Member
  kevin86: Black's position is horsemeat.
Jun-27-14  Chess Dad: I saw 20. Nd7, but wasn't expecting Qc7, and I'm not sure what I would have played in response. I clicked through too quickly after seeing that I had move 20 correct.
Jun-27-14
Premium Chessgames Member
  chrisowen: Bad for d7 won key in flight a knight at fly f6,

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devious f8 room too descend my thin picking g8 band it's my curious nature got avow a digger c7 bill of health aim crappy b8 mug off catch in the vale e5 rhyme no reason ar blip d5 gives right rise good 20.Nd7 Qc7 it book cramper nod in not right maybe stipulate arm b4 all d5 and f4 angle too cute in germane famile thrust back to off f4 load cook you save light in case a rich as lide hinge box 20...Nf4 21.Qc2 (2.14) man takes at amp f6 exchange again down winning position aim e4 hive bed buys e5 time knight d7 batten down and barricade the hatch f6 accustom as have in a tour aim e4 swop off at h3 and light looks set to burn piece up or a 21.Bxh7+ has a flake headlong gave check king rook at h3 would fine to dull a spade f6 leeway given circus offside (7.41) zoo descend upon black an e2 queen rampant or knight wins effect slam pop now early f6 bath bishop and rook cast to the hilt wins at by a foot plink plonk a h7 koinus hideway agree register key pave e5 up rid f6 and slots in to ebony f6 place.

Jun-27-14  kjr63: 20.Nd7 Nf4 and takes a rook with a check
Jun-27-14
Premium Chessgames Member
  agb2002: The material is identical.

Black threatens 20... bxc4.

The first idea that comes to mind is 20.Bxh7+, but after 20... Nxh7 21.Qh5 Ndf6 22.Qh4 Rfd8 23.Ng4 bxc4 25.Nxf6+ Bxf6 26.Qxh7+ Kf8 27.Ba3+ Ke8 White is one piece down and the black king seems to escape. This suggests 20.Nd7, trying to divert the knight on f6 or to remove one of them:

A) 20... Nxd7 21.Bxh7+ Kh8 22.Bb1(c2..g6)+ Kg8 23.Rh8+ Kxh8 24.Qh5+ Kg8 25.Qh7#.

B) 20... Qc7 21.Bxh7+

B.1) 21... Nxh7 22.Qh5

B.1.a) 22... Ndf6 23.Nxf6+ and mate next.

B.1.b) 22... f5 23.Nce5 Bh4 (23... Ndf6 24.Nxf6+ Rxf6 25.Qxh7+ Kf8 26.Qh8#) 24.Rxh4 Ndf6 25.Nxf6+ Rxf6 26.Qxh7+ Kf8 27.Qh8+ Ke7 28.Qxg7+ wins decisive material.

B.1.c) 22... f6 23.Qxh7+ Kf7 24.Nxf8 Bxf8 (24... bxc4 25.Qg6+ Kg8 (25... Kxf8 26.Rh8#) 26.Rh8+ Kxh8 27.Qh7#) 25.Ne3 + - [R+P vs B] and attack.

B.2) 21... Kh8 22.Bb1+ Kg8 23.Nxf6+ Nxf6 (23... Bxf6 24.Rh8+ and mate in two; 23... gxf6 24.Qg4#) 24.d5

B.2.a) 24... bxc4 25.Bxf6 Rfd8 (25... gxf6 26.Qg4#; 25... Bxf6 26.Rh8+ and mate in two; 25... g6 26.Rh8#) 26.Rh8+ Kxh8 27.Qh5+ Kg8 28.Qh7+ Kf8 29.Qh8#.

B.2.b) 24... g6 25.Qe3 and the threat 26.Qh6-27.Qh8# looks decisive.

C) 20... Nf4 21.Qc2 (with the double threat 23.Nxf6+ followed by 24.Qxh7# and 23.Nxb8) 21... Nxh3+ 22.gxh3 g6 23.Nxb8 bxc4 24.bxc4 Rxb8 25.d5 + - [Q+P vs R+N].

Jun-27-14
Premium Chessgames Member
  Cheapo by the Dozen: I might need a board to play through the last bit of <agb2002>'s analysis. ::sigh:: My calculation abilities are NOT what they were 4 decades ago ...
Jun-28-14
Premium Chessgames Member
  TheBish: Christiansen vs J B Campos-Moreno, 1980

White to play (20.?) "Difficult"

Material is even. White has a knight under attack, but maybe can ignore that with a direct assault on h7, as two pieces (Bb1 and Rh3) are aimed there already, and the White queen is ready to join the party.

Candidate moves: Bxh7+, Nd7

The problem with 20. Bxh7+ Nxh7 21. Qh5 is 21...Ndf6, stopping the attack dead in its tracks. A better try is 20. Bxh7+ Nxh7 21. Nd7, but Black has 21...Nf4! 22. Qc2 Nxh3+ 23. gxh3 Qf4 and the attack is killed.

20. Nd7! is the right move order. Now:

(A) 20...Nxd7 21. Bxh7+ Kh8 22. Bf5+! Kg8 23. Qh5 f6 24. Bxe6+ Rf7 25. Qh8#.

(B) 20...Nf4 21. Qc2! Nxh3+ 22. gxh3 Be4 23. Nxf6+ Bxf6 24. Qxe4 g6 25. Ne5 and White has two pieces for a rook.

(C) 20...Qc7 21. Bxh7+! and wins, e.g. 21...Nxh7 22. Qh5 Ndf6 23. Nxf6+ and mates, or 21...Kh8 22. Nxf6 Nxf6 23. Ne5 and White's attack continues, a pawn up.

Jun-28-14
Premium Chessgames Member
  agb2002: <Cheapo by the Dozen: I might need a board to play through the last bit of <agb2002>'s analysis. ::sigh:: My calculation abilities are NOT what they were 4 decades ago ...>

I do use a board to solve the puzzles (without moving the pieces, of course). My eyes get very tired when I try to use the diagram only.

Jun-10-16  Howard: I don't know where else to post this inquiry, so I might as well do it on this page.

Why were Browne, Kavalek, and Robert Byrne--of all people--absent from the U.S. team at the 1980 Olympiad. There obviously must have been SOME concrete reason, but I don't know why.

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