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Grigory Yuryevich Serper vs Eric Lobron
Dortmund (1993), Dortmund GER, rd 2, Apr-11
English Opening: King's English. Four Knights Variation Fianchetto Lines (A29)  ·  1/2-1/2

ANALYSIS [x]

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Jun-26-10
Premium Chessgames Member
  patzer2: <RV> Thanks for the analysis of 70...c4! . Now there's an interesting surprise move worthy of study, involving two sham pawn sacs and four Knight moves to escort the passed g-pawn!
Jun-26-10
Premium Chessgames Member
  jessicafischerqueen: We are announcing an award for the best contribution or series of contributions to the <Puzzle of the Day> by a non-premium member in the past year. The award—a one-year premium membership from the <Rinus Award> fund in memory of User: Rinus –will be used to encourage non-premium members to contribute to the <chessgames.com> community through the posting of analysis or other chess-related discussion at the <POTD>.

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Jun-26-10  Marmot PFL: White needs to eliminate some pawns -

1st try - 71 ng6 c4, black has 2 passed pawns and white probably can't stop both

2nd try - 71 Bxc5 gh5, also looks hopeless but suggests an idea

3rd try - 71 h6 Nxh6 (Kf7 Bxc5) 72 Bxc5 and black has an extra pawn, but only 1 passer. With careful play white should likely draw. The bishop can defend white's remaining pawns and attempts by black to win the a pawn would cost both his king side pawns.

Jun-26-10  kramputz: <zooter: I'm thinking 71.h6 Nxh5> It is Nxh6. Learn the board.

/

Jun-26-10
Premium Chessgames Member
  jessicafischerqueen: no need to <kramputz> zooter's style- everyone prints mistaken squares sometimes.

<zooter> was just nominated for a the <POTD Rinus Award> with one year premium membership prize!

Jun-26-10
Premium Chessgames Member
  kevin86: it looks like white saved this one with a pawn sac that gained a few tempi.
Jun-26-10  kb2ct:

Black missed 70....Pc4
The concept with Pg4 is flawed. Better to go passive.

:0)

Jun-26-10
Premium Chessgames Member
  Breunor: Can white avoid losing a pawn by playing 11 B x f3?

Thanks for any help!

Jun-26-10  Ferro: Es Fortuíto el silencio que pesa
Jun-26-10
Premium Chessgames Member
  johnlspouge: Saturday (Very Difficult)

Serper vs E Lobron, 1993 (71.?)

White to play and win.

Material: B for N+P. White has an advanced Ph5, presently stopped by Nf5 at h6, but able to capture Pg6. The White Bg1 stops the passed Pg3. Apparently, White cannot permit 71...gxh5, yielding Black 2 connected passed Ps. The White Bg1 has trouble if it has to stop Ps not on a common diagonal.

Candidates (71.): hxg6

I had another clean miss today.

Jun-26-10
Premium Chessgames Member
  johnlspouge: I am traveling, so I cannot do a computer analysis of 71.hxg6. I might have missed a good variation for Black, but the position after 71.hxg6 seems drawn, although I see more chances for White than Black.
Jun-26-10
Premium Chessgames Member
  chrisowen: You Serper need head seeing to. 6.Bg2 go down a general trading (see on way Ehlvest vs C Hansen, 1993) drawing line. Aims that are blown out of all proportion, black erect a fortress passing the buck over let white dig. It was a complex finish good nevertheless landing Bg1 receives attentions e6 sidestep sharing the point bag h6.
Jun-26-10  Ferro: NO. Se puede...
12.Nxf6+ Qxf6
13.Qxf6 gxf6
14.exd4 Bxd4
15.Bxc6 bxc6
16.c5 Bxc5
17.Bh6 Rfe8
18.Rac1 Re4
19.Rfe1 Rae8
20.Rxe4 Rxe4
21.b4 Bxb4

o 21.Rc3

Jun-26-10  RandomVisitor: <Breunor>Yes, 11.Bxf3 looks like a better move than what was played, 11.Qxf3.

White probably thought he would get some compensations for the pawn, but it turns out that even after 11.Qxf3 exd4 <12.Nxf6+> Qxf6 13.Qxf6 gxf6 14. exd4 Bxd4 15.Rd1 (likely better than 12.Nxb6) that it might not be enough.

Jun-26-10  Ferro: Breunor

Tb:
18...Re2
19.Rc3 Rxb2
20.Rf3

Jun-26-10  Ferro: 19.Rc4
Jun-26-10  DarthStapler: I didn't get it
Jun-26-10
Premium Chessgames Member
  Breunor: Thanks RandomVisitor!
Jun-26-10  sleepyirv: <Once> That's a beautiful little essay. It's nice to see the creativity (on and off the board) these puzzles can bring out of people.
Jun-26-10  CHESSTTCAMPS: White is down a pawn and has an unfavorable instance of bishop versus knight because of the higher quality (and lower vulnerability to attack) of black's pawns. With black threatening 71... gxh5, creating connected passed pawns on g & h-files, white has two obvious candidates to consider (71.Bxc5, 71.hxg6) and a slightly less obvious, but more forcing candidate, 71.h6. Considering each candidate in turn:

1. 71.Bxc5 gxh5 can be rejected quickly on the general principle that two connected passed pawns are much stronger than one. A sample line is 72.a5 h4 73.Kf3 Kd5 74.Bb4 h3 75.Be1 h2 76.Kg2 Ke4 77.Bd2 Nh4+ 78.Kh1 Ng6 winning the f-pawn and black can resign at any time.

2. I didn't like the looks of 71.hxg6 c4 when I first saw the puzzle, but it required a night's sleep to see the full tactical reason:

2A) 72.g7 (expecting Nxg7 73.Kd4) Kf7!! The knight must be laughing. 73.Kxf5 c3 74.Kg4 c2 75.Be3 g2 wins

2A.1) 73.Kd5 c3 similarly promotes either the c-pawn or g-pawn.

2A.2) 73.Kf3 Kxg7 74.Ke2 Nh4! and the WK can't approach the c-pawn due to Nf3(+) and the approach by the BK guarantees an easy win by black.

2B) 72.Kf3 Kf6 followed by 73... Kxg6 and black's separated passed pawns will win as in the preceding lines

By process of elimination, the correct candidate has to be:

3A) 71.h6! Nxh6 (worse is Kf6/f7? 72.Bxc5) 72.Bxc5 Nf5 73.Kf3 Kd5 74.Bg4 Kc4 75.Be1 Kb3 76.a5 Ka4 77.Kg2 and black can't make progress because a N move abandons protection of g3.

Now how many people might have played 71.hxg6 on "looks" without doing any OTB analysis? I'll raise my hand.

Time to see how this played out.

Jun-26-10  turbo231: missed it mostly clueless.
Jun-26-10  TheBish: Serper vs E Lobron, 1993

White to play (71.?) "Very Difficult"

No time now for the analysis, but it looks like forced is 71. h6! Nxh6 72. Bxc5 and White should draw.

Jun-27-10  turbo231: Maybe I got it. I was trying for a win as white when all I could see was a draw. My very first Saturday solve? I'll have to play against a computer and see if I can get a draw.

On second thought no I can't because I've already watched the game. Or can I because my first move would have been different I was going to try hxg6. Let me see if that move gets a draw.

Jun-27-10  turbo231: No got mated using hxg6. Wrong move.
Jun-27-10  tacticalmonster: 1) White has two choices of capturing the pawn: either Bxc5 or hxg6. which one? Any other alternatives?

2) Black has two passed pawns. The g3 pawn is restrained but the c5 pawn will decentralize the WK giving BK inroad to penetrate.

3) White is down a pawn but Black's extra pawn is doubled on the g file.

4) White's pawns are significantly weaker than Black's pawns. White only passed pawn is threatened and prevented from advancing. Black has a unbreakable light-square blockade on f5. The a4 pawn is not passed.

Candidate: hxg6 and h6

a) 1 hxg6 b6 ( White is in zugawang) 2 Kf3 (if 2 Kd3 Kd5!) Kf6 3 Ke4 Kxg6 4 Kd5 (if 4 Kf3 Kh5 5 Ke4 Kg4 6 Ke5 g2 7 Ke4 Nh4 8 Ke3 Nf3 9 Kf2 Nxg1 10 Kxg1 Kxf4 11 Kxg2 Ke4 ) Nd4! 5 Ke4 Kf6 6 Ke3 Kf5 7 Kd3 Nf3

b) 1 h6 Nxh6 2 Bxc5 Nf5 3 Bb6! (prevents Kf6 follwed by g5 because of Bd8+) Nh4 4 Bd4 g2 5 Bg1= - Black cannot make progress: If BK go to the queenside, W will sacrifice the bishop for the g-pawn and march WK to capture g6. If BK penetrate to g4 via h7-h6-h5, W will also sacrifice the bishop for the g pawn and goes after b7 pawn with the WK.

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