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Luis Valenzuela Fuentealba vs Boonsueb Saeheng
Yerevan Olympiad (1996), Yerevan ARM, rd 7, Sep-23
Queen's Indian Defense: Kasparov-Petrosian Variation. Main Line (E12)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Nov-23-16
Premium Chessgames Member
  Phony Benoni: OK, are we going to use mate threats to force a promotion, or a promotion to force mate threats?

The immediate promotion doesn't look promising with Black's threats to check on a1 if the rook gets to lively, so look to the king.

<37.Bxg5+> is about the only forcing move availab.e, so let's see: <37...Kxg5 38.Qg7+< and:

38...Kf5 39.Qg4+ Ke5 40.Qe4#. This might be promising.

38...Kh5 39lg4+ Kh4 40.Qh6#. Also good.

But what if 37..fxg5? Must b3 38.Qe++. Now 38...Kh5 39.g4+ and we've seen that act before. but after 38...Kg7/Kh7 39.Qxe7+ followed by 40.d8Q Rxd8 41.Qxd8, and our back rank remains guarded.

Nov-23-16
Premium Chessgames Member
  agb2002: White has an extra pawn.

Black threatens Qxd1# and gxf4. If the white rook moves horizontally then Qxd7.

White can expose the black king with 37.Bxg5+:

A) 37... fxg5 38.Qe6+

A.1) 38... Kh5 39.g4+ Kh4 40.Qh6#.

A.2) 38... Kg(h)7 39.Qxe7+ Kg(h)6 (39... Kg(h)8 40.d8=Q+ wins) 40.Re6+ and 41.Qe4# or 41.Qh7#.

A.3) 38... Bf6 39.Qxf6+ as in A.1 or A.2.

B) 37... Kxg5 38.Qg7+

B.1) 38... Kf4 39.Qg4+ Ke3 (39... Ke5 40.Qe4#) 40.Qe4+ Kf2 41.Qe1#.

B.2) 38... Kf5 39.Qg4+ Ke5 40.Qe4#.

B.3) 38... Kh4 39.Qg4#.

B.4) 38... Kh5 39.g4+ Kh4 40.Qh6#.

Nov-23-16  stacase: 37.Bg5+ is obvious, but then the choice between 38.Qg7+ or 38.Rd5+ is a bit more challenging.
Nov-23-16  Cybe: 34… Rf8 is obvious – Black is losing a little bit later.
Nov-23-16  gofer: Due to the back rank mate threat today's POTD was much easier easier than yesterday. There is only one move that looks to provide chances for white...

<37 Bxg5+ ...>

37 ... fxg5
38 Qe6+ ...

38 ... Bf6
39 Qxf6+ K anywhere
40 d8=Q

38 ... Kg5
39 g4+ Kh4
40 Qh6#

38 ... Kg7/Kh7
39 Qxe7+ K anywhere
40 d8=Q

<37 ... Kxg5>

At this point, I missed 38 Qg7+ and went for 38 f4+ ... which is rubbish... due to 38 ... Kh6

Nil Point...

Nov-23-16  Lambda: I immediately went for 38.Rd5+ to get the rook involved in the action, and after 38...Kf4 39.g3+ just concluded that it must be impossible for black to survive, instead of calculating any more lines.
Nov-23-16  R4f43l L3 M4550n: I found today's puzzle (37. ?) a little easier than yesterday's.

Almost instantly identify the Bishop sacrifice as candidate (37. Bxg5), as the colleagues too. Black is menacing mate in one. Besides, Black's passed pawn (Queen side) is too dangerous, so no tempo for quiet move.

Now, Black King is too exposed! After the sacrifice it's taken me about two minutes to calculate mates threats.

Nov-23-16  Pedro.Akcio: I played 38.Qd5..not a bad move, but not the BEST also
Nov-23-16  saturn2: Bxg5 and the black king will find no rest anymore.

a: ..KxB 38 Qg7+
b: ..fxB 38 Qe6+

Nov-23-16
Premium Chessgames Member
  patzer2: For today's Wednesday puzzle position (37. ?), White faces the threat of 37...Qxd1#. So desperate measures are required to force a win.

The winning desperado is 37. Bxg5+! which forces mate-in-six.

P.S.: For a Black improvement, in the opening phase, I prefer 7...dxc4 = over 7...Nbd7 8. cxd5 to . See Dmitry Anikonov vs P Maletin, 2015 for an example of play after 7...dxc4 =.

Nov-23-16  ChessHigherCat: When I was playing through the game, I couldn't believe that black could get away with letting white play 34. Qf7+ and it turns out he couldn't.
Nov-23-16  Conrad93: Go away Chris Owen...
Nov-24-16  john barleycorn: <Conrad93: Go away Chris Owen...>

Why? There is no mention of the en-passant rule.

Nov-24-16  Conrad93: <Why? There is no mention of the en-passant rule.>

You're like a broken record.

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