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Johann Echavarria vs Jorge Szmetan
III Open (1999), Cali COL, rd 3
Alekhine Defense: Modern Variation. Main Line (B05)  ·  0-1

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 1 OF 2 ·  Later Kibitzing>
Mar-16-07  syracrophy: It's understandable that the pair of ♗ are better, but it was too optimistic by White to expose his ♔ in that way. What a beatiful mate!
Mar-16-07  iceman77: A beautiful smothered mate. The bishop pair is useless in this position.
Mar-16-07  mckmac: I got 50..Nb6 51.b5 c5 52.bxa6 but,alas, missed the correct follow through.Forgot that bxa6 leaves an empty square behind so 52.Nb2+ is not mate!DratDratDrat. Very good puzzle.Thinking time:7 mins.
Mar-16-07  nimzo knight: what about 50..b6+ 51 Ka4 b5+ 52 cxb5 cxb5+ 53. Ka5 Nc6
Mar-16-07  MostlyAverageJoe: Indeed, as someone mentioned yesterday, the theme for the week seems to be "puzzles easier than usual."

White has his king hopelessly crowded by its own pieces, so it was a big hint that a mate should be achievable. For me, the key to the solution was noticing that the white king can move only to a3 and b4 (after moving the b4 pawn) and both routes are easily cut off by Kb6 and c5 respectively. White's bishop on g5 is useless, and the other one cannot protect both b3 and c4 fields that the black can use.

There is another equivalent mating line in addition to the one in the game: 50. ... ♘b6 51. ♙b5 ♙c5 52. ♙bxa6 ♘xc4+ 53. ♔a4 ♘b2+ 54. ♔a5 ♙b6#

Mar-16-07  MostlyAverageJoe: <nimzo knight: what about 50..b6+ 51 Ka4 ... etc >

51. Kxa6 and good luck chasing it now...

Mar-16-07
Premium Chessgames Member
  al wazir: I saw the first move and white's forced response, but not the beautiful 51...c5. Maybe in a game I would have seen it. Yes, I'm sure I would. I'll give myself the point.
Mar-16-07  mckmac: ...and of course 51.Bd1 falls to Nxc4+ followed by Nb2+ swiping the Bishop
Mar-16-07  chessmoron: A interesting and fascinating mate. 50...Nb6 is quite obvious and took a minute or two on the continuations.

If 52.Bd1 Nxc4+ 53. Ka4 axb5#

Mar-16-07  MostlyAverageJoe: <mckmac: ...and of course 51.Bd1 falls to Nxc4+ followed by Nb2+ swiping the Bishop>

Nope, followed by ♙b5#.

And, just in case, 51 ♗e2 is not followed by swiping the bishop, either, but by ♘b3# :-)

Mar-16-07  mckmac: <MostlyAverageJoe> You are right sir,the pawn takes the point.
Mar-16-07  MostlyAverageJoe: <alshatranji: What about 50...Nb1, threatineing 51.. b6+, then b5+, and then Nb6#.>

You probably mean 50 ... Nb8.

Refuted by 51. c5

Mar-16-07  mckmac: <MostlyAverageJoe> You get all those lines without using a board.I'm impressed (and depressed!)
Mar-16-07  dzechiel: Boy, I'm really disappointed. I felt certain that there was a checkmate using the knights and pawns against the white king. I looked at the position for six or seven minutes and convinced myself that the key move was 50...c5, but now I see that I got the move order wrong and that white can escape with 51 Be3. Nuts! I was having such a good week too!
Mar-16-07  Tactic101: Felt the same as <dzechiel>
Mar-16-07  Papablanca: Just like yesterdays puzzle I recognize this one from the wonderful 'The Ultimate chezz puzzle book' by Emms.
Mar-16-07  TheBB: I'll give myself half credit for this. I saw the initial mating threat, and the defense, but I went for free pawns. I think it wins, but it's much more work.

Pretty mate.

Excellent week for me this far!

Mar-16-07  TheBB: Hmm... I guess not. But satisfied nontheless.
Mar-16-07  tallinn: I think to score fully it is sufficient to notice that Nb6 threatens mate in at least two ways (Nb3# and Nxc4+ Ka4 b5# - in fact there is a third threat c5 bxc5 Nc6#). White cannot defend against all this - the white squared bishop is useless so b5 is forced but c5 reinstantiates all threats and white has nothing more.
Mar-16-07  Sibahi: missed it completely ...

While I was looking at the puzzle the only thing I was thinking about is : How did it get to this position?

Mar-16-07  NotABanker: nice finish.
Mar-16-07  Shubes82: wait...dumb question but how come white can't capture en passant after black plays 53)...b5#

??

Mar-16-07  Marco65: It's impressive how two knights here are more powerful than the bishop pair. Probably too many pawns on the board, and 46.fxe6 was a better decision.

From move 48 on all White's moves seem forced

Mar-16-07  greensfield: The White King is severely restricted with only one escape square <a4>. I started with 50...Nb6 as this prevents this escape route & threatens ...Nb3#. Got as far as considering

(a) 51.Bd1 preventing ...Nb3 and

(b) 51.b5 creating another escape square

But didn't find the good finish.

Mar-16-07  geraldo8187: <shubes82> en passant would only be possible if the white pawn rested at a5
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