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Gerardo Fabián Barbero vs Gilles Andruet
Montpellier (1986), Montpellier FRA
Queen's Indian Defense: Kasparov-Petrosian. Andersson Variation (E12)  ·  1-0

ANALYSIS [x]

FEN COPIED

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sac: 30.Nf5+ PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
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Nov-30-17  mel gibson: The computer says mate in 12

30. Nf5+ (30. Nf5+ (♘h4-f5+
e6xf5 ♕h5xh6+ ♔g7-g8 ♕h6-g5+ ♔g8-f8 ♖c6-h6 ♔f8-e8 ♕g5-f6 ♕b7-c7 e5-e6 f7xe6 ♕f6xe6+ ♔e8-f8 ♖h6-f6+ ♔f8-g7 ♖f6-g6+ ♔g7-h8 ♕e6-f6+ ♔h8-h7 ♖g6-h6+ ♔h7-g8 ♖h6-h8+) +M12/17 26)

Nov-30-17
Premium Chessgames Member
  patzer2: Got the first four moves of today's Thursday puzzle (30. ?) with 30.Nf5+ exf5 31.Qxh6+ Kg8 32.Qg5+ Kf8 33. Rh6 +-.

After 33...Ke8, instead of 34. e6 +- (mate in 23, Stockfish 8) my pick was 34. Qxf5 (mate in 28, Stockfish 8). The quickest route to mate is 34. Qf6 (mate in 8, Stockfish 8).

P.S.: For a possible early Black improvement, instead of 8...Bxd3 9. Qxd3 = to ⩲ (+0.20 @ 33 ply, Stockfish 8) I slightly prefer 8...d5 = to ⩲ (+0.14 @ 32 ply, Stockfish 8) as in Kramnik vs Vaganian, 1995.

Nov-30-17
Premium Chessgames Member
  ajk68: Black has so many bad pieces in the middle of the game. There isn't a strategy here. The development is haphazard.
Nov-30-17
Premium Chessgames Member
  ajk68: 21...g6 really has me stymied. Why weaken the king side?
Nov-30-17
Premium Chessgames Member
  morfishine: Pathetic play by Black

*****

Nov-30-17  saturn2: Blacks pieces are in the corner far from the king. I dont know if 31 Rxh6 also works after 31..Rg8
Nov-30-17
Premium Chessgames Member
  agb2002: The material is identical.

Black threatens Qxc6.

The position of the black king suggests 30.Nf5+:

A) 30... exf5 31.Qxh6+ Kg8 32.Rf6 (threatens 33.Rxf5 and 34.Rg5#; 32.Qg5+ Kf8 33.Rh6 Ke8 34.Rh8+ Kd7 35.Qxf5+ Kc6 36.Rh6+ Kc7 37.Qxf7+ Kb8 unclear)

A.1) 32... Qc8 33.Qg5+ Kf8 (33... Kh8 34.Rh6#) 34.Rh6 Ke8 (34... f5(6) 35.Qf6+ and mate soon) 35.Rh8+ Kd7 36.Qxf7+ Kc6 37.Rxc8 wins decisive material.

A.2) 32... Qd7 33.Qg5+ Kf8 34.Rh6 f5(6) 35.Qf6+ and mate next.

A.3) 32... Qe7 33.Rxf5 f6 (33... Qf8 34.Rg5+ Qg7 35.Qxg7#) 34.Rxf6

A.3.a) 34... Qg7 35.Rg5 wins decisive material.

A.3.b) 34... Qh7 35.Qg5+ and either 36.Rh5 or 36.Rg5 will pin the black queen.

A.3.c) 34... Rf8 35.Rg6+ Kf7 36.Rg7+ wins decisive material.

A.4) 32... Nc5 33.Rxf5

A.4.a) 33... Ne4 34.Rh5 f5(6) 35.Qh8+ Kf7 36.Qh7+ and 37.Qxb7 wins.

A.4.b) 33... f6 34.exf6

A.4.b.i) 34... Kf7 35.Qh7+ wins.

A.4.b.ii) 34... Rf8 35.Qg6+ and mate in two

A.4.b.iii) 34... Qf7 35.Rg5+ and mate next.

A.4.b.iv) 34... Ra7 35.Qg6+ Kf8 (35... Kh8 36.Rh5+ Qh7 37.Qe8#) 36.Rh6 wins.

B) 30... Kh7(8) 31.Qxh6+ Kg8 32.Qg7#.

C) 30... Kg8 31.Qg4+ Kf8 32.Qg7+ Ke8 33.Rxe6+ (or 33.Nd6+ Kd7 34.Nxb7 Kxc6 35.Qxf7, etc.)

C.1) 33... fxe6 34.Qxb7 wins.

C.2) 33... Kd7 34.Qxf7+ Kc8 35.Re8#.

C.3) 33... Kd8 34.Qf8+ Kc7 35.Qxf7+ Kb8 36.Re8+ Ka7 37.Re7 wins.

D) 30... Kf8 31.Qxh6+ Ke8 32.Nd6+ as above.

Nov-30-17  gofer: Both the rook and knight sacrifices look tempting, but the rook sacrifice seems premature. This is a simple <Thursday> POTD, but only because black has absolutely no defensive pieces on the kingside (i.e. Na6 is well and truly dim and Ra8 isn't much better!).

<30 Nf5+ ...>

30 ... Kh7/Kh8
31 Qxh6+ Kg8
32 Qg7#

30 ... exf5
31 Qxh6+ Kg8
32 Qg4+ Kf8
33 Rh6 Ke8
34 e6! fxe6
35 Qg8+! Kd7/Kd7
36 Qxe6+ Kd8
37 Qd6+! Ke8
38 Rh8+ Kf7
39 Rh7+ Ke8
40 Qg6+ Kf8
41 Qf6+ Kg8
42 Qh8#


click for larger view

<30 ... Kf8>
<31 Qxh6+ Ke8>


click for larger view

Now we seem to have come to a crossroads.

1) We can give up the rook for a queen and a certain win

32 Nd6+ Kd7
33 Nxb7 Kxc6
34 Nd6 +-

OR

2) We can go for something a little more emphatic!

<32 Rxe6+! ...>

32 ... Kd7
33 Re7+ mating

32 ... Kd8
33 Qf8+ Kd7/Kc7
34 Qd6+ Kc8
35 Re8#

<32 ... fxe6>
<33 Nd6+ Ke7>
<34 Qg7+ Kd8>
<35 Qf8+ Kd7>
<36 Qf7+ Kd8>
<37 Qe8+ Kc7>
<38 Qe7+ Kc6/Kb8>

<39 Qxb7#>


click for larger view

~~~

<Patzer2: I am suprised that <34 e6> takes another 23 moves!>

<34 ... fxe6> seems to be only 8 more moves to mate, so it must be from black giving up Q+R+N to form a "defence", with something like... <34 ... Qe7 35 Rh8+ Qf8 36 Qf6 Ra7 37 Rxf8+ Kxf8 38 Qh8+ Ke7 39 exf7> that black puts up more resistence, but another 17 moves to mate...!?

Nov-30-17  clement41: I cannot claim full credit for this one, as I missed 34 e6. Instead I went 34 Rh8 Kd7 35 Qf5 Kc6 36 Qc2 and was not even 100% sure I can force a repetition/perpetual
Nov-30-17  ChatGrognon: Missed e6. That was a nice finish.
Nov-30-17
Premium Chessgames Member
  malt: 30.Nf5+ ef5
(30...Kg8 31.Qg4+ Kf8 32.Qg7+ Ke8 33.Nd6+) 31.Q:h6+ Kg8 32.R:b6 Qa7 33.Qg5+ Kf8 34.Rh6 Ke8 35.Qf6 Qc7/Qb8 36.Rh8+
Nov-30-17
Premium Chessgames Member
  WorstPlayerEver: Not so hard as yesterday

A Schwarz vs Bird, 1873

However, it's adviced to thoroughly study the meaning of open lines when a King is under pressure. Especially a move like 30... Kg8 where White has two pieces hanging, but the threatening fork of the Knight and the open lines make Black's situation hopeless.


click for larger view

20 pieces (10/10): WS: 6, BS: 14 / QS: W4-B6, KS: W6-B4 / Kg2-Kg8

The position may even become more illustrative when we apply the concept of metamorphose on it:


click for larger view

Nov-30-17
Premium Chessgames Member
  mike1: Could please someone advise why 31.Rxh6 does not work? Next either Qxg5+ or Rh7+...
Nov-30-17  Walter Glattke: A5) 31.Nf5+ exf5 32.Rf6 Rh8 I think A) is
no good ides.
Nov-30-17
Premium Chessgames Member
  paavoh: After the straight-forward 30.Nf5+ exf5 31.Qxh6+ Kg8 32.Qg5+ Kf8 33.Rh6, I ended up chasing the Black King over to the Q side, without a mate. I failed to spot the power of 34.e6.

Seems that I have company...

Nov-30-17
Premium Chessgames Member
  WorstPlayerEver: 34. Qf6 Qc7 35. e6 fxe6 36. Qxe6+ Kf8 37. Rf6+ Kg7 38. Rg6+ Kh7 39. Rh6+ Kg7 40. Qf6+ Kg8 41. Rh8#
Nov-30-17
Premium Chessgames Member
  patzer2: <Mike1> Your 31. Rxh6 +- also works. The Stockfish application on our Olga viewer gives the following analysis:

1) +7.62 (25 ply) 31...Rg8 32.e6 Kf8 33.Rf6 Rg7 34.exf7 Qxf7 35.Rxf7+ Rxf7 36.Qh8+ Ke7 37.Qc8 f4 38.gxf4 Rxf4 39.Qb7+ Kf6 40.Qxb6+ Kg5 41.Qxa6 Rg4+ 42.Kf3 Rf4+ 43.Ke3 Re4+ 44.Kd3 Rf4 45.Qxa5 Rxf2 46.Qxd5+ Kg6 47.Kc3 Kg7 48.Kb3 Rf6 49.Qg5+ Kf7 50.Qc5 Rf2

Nov-30-17  Marmot PFL: Very tricky puzzle as I underestimated the power of 34 e6! Helps that Na6 might as well be off the board for all the use it is to black.
Nov-30-17
Premium Chessgames Member
  WorstPlayerEver: Perhaps the most clear demonstration of positional passivity/activity exposes itself when when we study the following position:


click for larger view

Because now it's just a mate in 2 really. I bet y'all missed it. In a brute state of denial regarded to my obvious hint. That what was expected, however.

Never mind, nothing to worry about..

Nov-30-17  wtpy: Clearly there are lots of ways to win after knight sac.
Nov-30-17  Lambda: I went all around the houses with this one: 30.Nf5+ exf5 31.Qxh6+ Kg8 32.Qg5+ Kf8 33.Rh6 Ke8 34.Qxf5 Kd8 35.Rh8+ Kc7 36.Qxf7+ Kc6 37.Qg6+ Kb5 38.Qd3+ Ka4 39.Qc2+ Kb5 40.Qb3+ Kc6 41.Rh6+ Kc7 42.Rh7+ Kc8 43.Rxb7 Kxb7
Nov-30-17  varishnakov: I went with Rxh6, which is also winning. My ideas are laid out below. There were so many variations that I had to go more with a feel for the attack rather than seeing all the possible defensive options and responses.

30.Nf5+

> 30...Kf8 31.Qxh6+ Ke8 32.Nd6+ wins the queen > 30...Kg8 31.Nxh6+

>> 31...Kf8 32.Rxb6
>> 31...Kg7 32.Nf5+

30...exf5 31.Rxh6 with a strong attack

>31...Rg8 32.Rh7+ Kf8 33.e6
>31...Kf8 32.e6

In fact, now that I think of it, perhaps an immediate e6 is called for after 31...Rg8

Nov-30-17
Premium Chessgames Member
  Breunor: Ironically sad, both players died young.
Nov-30-17
Premium Chessgames Member
  eternaloptimist: I saw the combination all the way until right before 34.♙e6!. ♙e6! is a difficult move to see & b/c of this I think this puzzle should be ranked difficult instead of medium. I see that quite a few of u guys missed ♙e6!. This is a very good combo by the Argentine GM Barbero!
Nov-30-17
Premium Chessgames Member
  Bubo bubo: The sac 30.Nf5+ opens the 6th rank for the rook: after 30...exf5 (otherwise Black gets mated or loses his queen by a knight fork on d6) 31.Qxh6+ Kg8 32.Qg5+ Kf8 33.Rh6 Ke8 34.Qxf5 threatens mate-in-three (35.Rh8+ Ke7 36.Qf6+ Kd7 37.Qd6#), and Black has no sufficient response:

A) 34...Rd8 35.Rh8+ Ke7 36.Qf6+ Kd7 37.Qd7+ Kc8 38.Rxc8#

B) 34...Ke7 35.Qf6+ etc.

C) 34...Kd8 35.Rh8+ Kc7 36.Qxf7+ Kc6 37.Rh6+ loses the queen

D) 34...Qb8/Qe7 35.Rh8+

E) 34...Qc7 35.Rh8+ Ke7 36.Qf6+ Kd7 37.Qxf7+ Kc6 38.Qxc7+ Kxc7 39.Rxa8, and 40.RxN simplifies to a trivially won pawn ending.

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