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Gustavo Kanefsck vs Ruben Cristobal
City-ch (1999), Mar del Plata ARG, rd 9
Pirc Defense: Classical. Schlechter Variation (B08)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
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Feb-19-13
Premium Chessgames Member
  patzer2: <lost in space: I saw 19. Nxf7 Kxf7 20. Qxe6+ Kf8 21. Bd6#> Me too! It's demolition derby time (i.e. demolition of pawn structure combination theme) with 19. Nxf7!, and the Black King can't capture the pawn wrecking Knight without getting mated.
Feb-19-13
Premium Chessgames Member
  ZUGZWANG67: If 19...Rf8 then 20.Nd6 Qa6 21.Qxe6+ wins 2 pawns.

This is typical problems for a 3 rank defence: no good squares available for your pieces! :)

Feb-19-13  SamAtoms1980: This puzzle made me think of this game, even though it's not quite the same thing:

W Von Holzhausen vs Tarrasch, 1912

Feb-19-13  Abdel Irada: I used to know someone who routinely used "fsck" in place of a well-known profanity ... or so I thought.

Only now do I recognize it as a veiled reference to Kanefsck.

Feb-19-13  M.Hassan: "Easy"
White to play 19.?
Equal

19.Nxf7
<if...Kxf7 20.Qxe6+ Kf8 21.Bd6#>

19.........Rf8
20.Nxh6+ Kh7
21.Ng4
Knight gains two pawns and lands on a safe square.
Time to see how the game was played

Feb-19-13
Premium Chessgames Member
  Gregor Samsa Mendel: Kanefsck's opponent was probably the one saying "fsck" here. Or, more likely, "Porque no te vas al gran carajo?"
Feb-19-13
Premium Chessgames Member
  agb2002: The material is identical.

The light squares around the black king are momentarily weak. This suggests 19.Nxf7, attracting the king to a mating net:

A) 19... Kxf7 20.Qxe6+ Kf8 21.Bd6#.

B) 19... Re8 20.Nd6 + - [R+P vs N].

C) 19... Rf8 20.Nxh6+ + - [2P].

D) 19... Kh7 20.Nxd8 + - [R+P vs N].

E) 19... Nh5 20.Bxh6

E.1) 20... Kxf7 21.Qxe6+ Kf8 22.Qe7+ Kg8 23.Qxg7#.

E.2) 20... Bxh6 21.Nxh6+ Kh7 22.Ng4 + - [2P].

E.3) 20... Rf8 21.Bxg7 again two pawns ahead.

F) 19... g5 20.Nxd8

F.1) 20... Qxd8 21.Qxe6+ + - [R+P vs N].

F.2) 20... gxf4 21.Qxe6+, etc.

Feb-19-13  holy tramp: Yeah Black had trouble seeing White's plans here- even using a Cristobal.
Feb-19-13  Abdel Irada: You have to understand that what Black had here was a Ruben Cristobal, which shows nothing but an enticing view of a popular sandwich. This limits the options for clairvoyance.
Feb-19-13  morfishine: <19.Nxf7> Threatens 20.Nxd8 plus 20.Nxh6+ <19...Rf8> White mates after 19...Kxf7 20.Qxe6+ Kf8 21.Bd6 # <20.Nd6 Qd8 21.Qxe6+ Kh7> Black's position is a shambles

**********
PM1: I don't see a huge difference in 19...Rf8 & 20...Nf8; Since the Knight is immune after sacrificing on f7, the Knight will continue its rampage unabated until the game is effectively over

PM2: I noticed that White didn't have to grab the exchange; After 20.Nxh6+ Bxh6 21.Bxh6 Kh7 22.Bxf8 Rxf8 23.Qxe6 Qxe6 24.Rxe6


click for larger view

By simply simplifying, White is up 3-pawns

Feb-19-13  Abdel Irada: <morfishine>: In your PM2, I don't think 21. ...Kh7 is Black's best. Stronger appears 21. ...Re8, holding the e-pawn and greatly prolonging the game.

Black is still much worse and will eventually lose, but I think taking the exchange (to be returned later in return for that selfsame third pawn) *was* simplifying and probably the more efficient course.

Feb-19-13
Premium Chessgames Member
  Oxspawn: White appears o be able to break open the black position due to the weakness of the f pawn.

19. Nxf7
if 19.........Kxf7
20. Qxe6+ Kf8 (forced)
21. Bd6++

If 19. Nxf7 Re8
20. Nd6 forks rook and queen I guess it would continue

20...... Qc2
21 Nxe8 Qxf4
22 Nxg7 Kxg7
23 Qxe6

And white has a rook, bishop and two pawns for bishop and knight. I suspect I have missed something better for white after black plays Qc2...

Feb-19-13  morfishine: <Abdel Irada> I see your point though 'greatly' seems a stretch; Black already was able to drag it out even after losing the exchange

Either way, as you noted, Ruben's getting sandwiched :)

Feb-19-13
Premium Chessgames Member
  HeMateMe: Pretty straight forward. Black can lose two pawns and the exchange or immediately get mated.
Feb-19-13  maxfrank: In the game, 21d5 with the idea ...cxd5 22cxd5 exd5 23Nxd5 NxN 24Qc4. Wonder what engines like in move 21?
Feb-19-13  zb2cr: Found this. I have nothing to add to the commentary posted by <Patriot>, <lost in space>, <FSR>, <Abdel Irada>, <patzer2>, <ZUGSWANG67>, <agb2002>, <morfishine>, and <Oxspawn>.
Feb-19-13
Premium Chessgames Member
  chrisowen: Needed in flight I accedence 19.nxf7 in his aim, cinch in cooped up pieces again cruise a wave in cashing back begot head for heights free cap in light knight a lip in afore match in crikey it is camp i chuckings 19.Kxf7 20.qxe6+ a lick our black king boot off rim in see freedom I cage light rook here backings fab ko good in afraid it horded 20...kf8 21.bd6#
Feb-19-13
Premium Chessgames Member
  chrisowen: As i said incase of a wasting move like a fastening,

19...Nf8 in a hope for low having got, in free call light oomph 20.nxd8 Qxd8 in see edge for open shute light,

pawn up plus the exchange should go on to win forges the path queen in etc i seekings essays i neck e6 a binding ace in the knight cackle free card it toy in black sixes and sevens be daffy it duck in a stagnates 19.rf8 in has bullseye stakes pride in we knight sees aid for duty it double in mish mash feel it ruck in good 20.nxh6 in a hook it esp in every it single a mind dual pawn group have castle give in blew accordance sacrifice ogle d6,

instead black under the cosh a grip piles it metered in carpes tink diem in for dutifuls on 20.Nd6 20...qd8 in crumble what circuit you in race off to a 21.qxe6+ in cap district coil in kingh7 came gold mellow in manage go st 22.bh2 at crossroads in crackerjack black is too pawns down in burning effigy it cloy in.

Feb-19-13
Premium Chessgames Member
  gawain: I saw (after a long think) the mate after 19 Nxf7 Kxf7. How can d6 and e6 be so unprotected at this stage of the game? Surprising. After a longer think I decided that Black is positively lost even if he refuses the knight. Difficult puzzle for a Tuesday in my opinion.
Feb-19-13
Premium Chessgames Member
  whiteshark: What <zb2cr> said...
Feb-19-13  James D Flynn: Material is equal even down to the square colour of the Bs but Black is somewhat cramped and seems to have overlooked the obvious pseudo- sacrifice of the N on f7: 19.Nxf7 Re8(not Kxf7 20.Qxe6+ Kf8 21.Bd6#) 20.Nd6(if Nxh6 Bxh6 21.Bxh6 Kh7 White has won 2 pawns and exposed Black‚Äôs K and should obviously win, but White remaining pieces cannot be readily mobilized on the K-side and the pawn on h3 inhibits attacks by the Rs on the h file so material gain looks better) Qa6 21.b4 (there is no hurry to win the exchange when the Q is isolated on a6 and subject to attack ) Rac8(to defend c7 if the c3 N retakes after b5, if instead b5 c5 leaves the Q hopelessly entombed) 22.b5 cxb5 23. Nxb5 threatening to win 2 exchanges) Qh5(ifQh4(ifRe7 24.Bd6 Rf7 25.Qxe6 and the R is lost)24.b3 Qb4 26.Bd6 wins the Q) 25.Bd2 Qh4 26.Rb1 Qa6 27.Nxe8 Rxe8 28.Nc7 Qc8 29.Nxe8 Qxe8 30Qxe6+ Qxe6 31.Rxe6 White is up 2 pawns and 2Rs versus 2 Ns so the endgame is hopeless for black.
Feb-19-13
Premium Chessgames Member
  kevin86: The knight sac leads to a quick win.
Feb-19-13
Premium Chessgames Member
  ZZpatzer: First move not so hard, Nxf7. It's one of those "move first, ask questions later" kind of puzzles.

Endgame trainer link: http://www.chessvideos.tv/endgame-t...

Feb-19-13  Patriot: <ZZpatzer> Thanks for the link. After the third try or so I finally won in a rook and pawn ending.
Feb-20-13  snakebyt: I chose Nxf7 threatens his Rook but hoped he would take with pawn so my Queen can take Pawn and check. That didn't happen.
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