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Konstantin Aseev vs Vladimir Nevostrujev
Russian Championships (2002), Krasnodar RUS, rd 1, Aug-27
King's Indian Defense: Orthodox Variation. General (E91)  ·  0-1
ANALYSIS [x]

FEN COPIED

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sac: 31...Bxh2 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 4 OF 4 ·  Later Kibitzing>
May-14-10  wordfunph: i considered 31...Bxh2 32.Qxh2 but i didn't see 32...Bxg2+ and the final nail on the coffin 33...Qe3+ hitting white's bishop and rook.
May-14-10  Hoozits: I'm sorry, but is 31...,Bd4 not equally sufficient?
May-14-10  Hitokiri Battousai: 2 smoking barrels !!
May-14-10  MarbleSkull: Dang, Once. I liked today's bit of cleverness almost as much as your detective one from a few days ago. =) It makes me wonder how long you've been doing these. Maybe I'll curl up in front of the screen with a hot cup of cocoa some day and go through your backlogs.
May-14-10  Crowaholic: This puzzle could have started a move earlier because every move other than 31. Qg1 leads to a quick mate, e.g. 31. Kg1 Bxh2+ is mate in 3.
May-14-10
Premium Chessgames Member
  johnlspouge: Friday (Difficult)

K Aseev vs V Nevostrujev, 2002 (31...?)

Black to play and win.

Material: B for N. The White Kh1 is stalemated. The Black Bc6 pins Pg7 to Kh8. The White Qh2 bears the absolute burden of preventing both Qh3xg2# and Qh3xh2#. The White Qg1 also shares with the loose Be2 the burden of protecting Rd1 from Rd7. The Black Kg8 is secured from check.

Candidates (31...): Bxh2

31Bxh2 (threatening 32Bg3+ 33.Qh2 Qxh2# or 32Qxg2#)

32.Qxh2 [Qf1 Bg3+ 33.Kg1 Qh2#]

[Qf2 Bg3+ 33.Kg1 Qh2+ 34.Kf1 Bxf2 suffices]

32Bxg2+ 33.Kg1 Qe3+ 34.Kxg2 Qxe2+ 35.Kg3 [Kg1 Rxd1#]

[Kh1 Rxd1+, etc.]

Black now emerges with R+P for N:

35Qxh2+ 36.Kxh2 Rxd1 probably suffices, but

35Qe3+ 36.K any Rxd1 is better.

[Toga declares 35Qxd1 as much better than 35Qe3+.]

May-14-10  Patriot: This took me too long, since I couldn't immediately see why I should invest a bishop (31...Bxh2 32.Qxh2). But the investment is not that terrible even without seeing the entire combination since you are at least acquiring two pawns for a bishop (31...Bxh2 32.Qxh2 Bxg2+).

After that, it was hard for me to invest another bishop (33.Kg1 Qe3+). But once you've made that consideration it's easy to see that 34.Kxg2 Qxe2+, followed by 35...Qxh2 and 36...Rxd1 wins a lot of material.

<<Hoozits>: I'm sorry, but is 31...,Bd4 not equally sufficient?>

What's your plan after 31...Bd4 32.Qf1?

May-14-10
Premium Chessgames Member
  chrisowen: Every chance the double sac bishop will test. I see lesson in assessing viable king's safety. Nyet constantly dominate it was the method used. 31..Bxh2 Qxh2 Bxg2+ looks to seal him then Qe3+ queers his pitch.
May-14-10
Premium Chessgames Member
  whiteshark: You know you got it, if it makes you feel good...
May-14-10
Premium Chessgames Member
  kevin86: I got this one-after all of the exchanges,black is ahead Rook and Two Pawns vs a Knight.
May-14-10  Voices0fdoom: I agree with Tactical Monster, Rook Vs a Knight? 37.Kg3, Rd2! No win Situation for White.
May-14-10
Premium Chessgames Member
  lost in space: Nice and sweet---- but I haven't got it.

Sigh

May-14-10
Premium Chessgames Member
  DarthStapler: I picked Bd4 instead
May-14-10  VincentL: "Difficult"

I haven't got much time to look at this today.

The move that has soon come to my mind is 31....Bd4. If 32. Rxd4 Rxd4 and the exchange is lost - of course black cannot play 33. Qxd4 on account of 33....Qxg2 mate.

But after 34. Qf1 I am having problems. 34.....Qe3 looks strong, but I cannot see any immediate win.

Another possibility is 34......Rd6 followed by 35.....Rf6.

I am missing a key move I think, and am out of fime, so I am going to check to see what happened.

May-14-10  VincentL: Ah... 31.... Bxh2. Didn't try this.

Does Bd4 also win?

May-14-10  rapidcitychess: 31...Bxh2!
A 32.Qxh2 Bxg2+ 33.Kg1 and now all battalions fall after 33...Qe3+

I almost missed this because I didn't see the rook.

May-14-10  jsheedy: OK, this is without a board or computer and with a phone call interrupting me. Total time: 20 minutes. Let's see if this is right: 31...Bxh2, 32. Qxh2, Bxg2+, 33. Kg1, Qe3+, 34. Kxg2, Qxe2+, Kh1, Rxd1+, Qg1, Rxg1+ and wins. Time to check...
May-14-10
Premium Chessgames Member
  David2009: K Aseev vs V Nevostrujev, 2002 Black 31...?

This is an intriguing position. The most obvious forcing move is 31...Bd4 but 32 Qf1 holds: this defence also works against 31...Rxd1 32 Bxd1 Bd4. Meanwhile White is threatening Rxd7 winning a piece.

However 31...Bxh2! breaks through, main line 32 Qxh2 Bxg2+ 33 Kg1 Qe3+ 34 Kxg2 Qxe2+ 35 Kh3 Qxh2+ 36 Kxh2 Rxd1 and the ending is hopeless for White. Time to see how the game went:
=====
Yes. Having not solved Wednesday's or Thursday's puzzles, it was time I got one right.

May-14-10  A Karpov Fan: got it quick and easy. makes up for yesterday :-)
May-14-10  Loque7771: This puzzle was more medium than difficult:)
May-14-10
Premium Chessgames Member
  David2009: <Jimfromprovidence: I got 31...Rxd1 32 Bxd1 Qd3 33 Qe1 Bxa4 34 bxa4 Qxc4, winning at least a pawn> and <tarek1> suggested <31...Bd4 32 Qf1 Rd6 Bf3> with an interesting position. I wanted to see how these and positional lines would work out, so I fed them into Crafty End Game Trainer (reversing the colours). In the main line 31...Bxh2 the ever-resourceful Crafty finds a glimmer of hope for the defence: 32 Rd5! limiting White's losses to the exchange and one Pawn down. Against <Jim's> line Crafty defends with 35 Qe2 and if 35...Qxe2 36 Bxe2 with drawing chances because of the opposite-coloured Bishops.

Crafty link to the position with colours reversed http://www.chessvideos.tv/endgame-t... (CraftyEGT always takes Black).

May-14-10  wals: Rybka 3 1-cpu: 3071 mb hash: depth 16:

White's decline.
-0.39 21.e5. Available, all equal, Qh4
0.21, Qe1 0.18,Be3 0.18,Qd2 0.18,Kg1 0.16.

-1.01 24.Qh4.Available, Nd5 -0.31, Qe1
-0.52,h3 -0.61, g5 -0.64, Be2 -0.76.

-1.99 26.Qe1. Available, Qg5 -0.99,Qf2
-1.12, Qh6 -1.25, Rd1 -1.36, Nd5 -1.52.

-4.76 27.Be2. better Ne2 - 1.99 or Qh4
-2.25.

-4.71 30.Qg1. the only move, as Qxf7 #5,
Kg1 #4, Rxd7 #2, g5 #2, Rd5 #1.

May-14-10  ohfluckaduck: Brilliant, I missed it completely.
May-15-10  M.Hassan: <once>: Intersting and charming account of how checkmate/winning is achieved.
May-25-12  LoveThatJoker: What a fantastic game by GM Nevostrujev!

LTJ

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