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Aleksander Petkov Delchev vs Boris Nikolov Chatalbashev
TCh-BUL (2001), Pamporovo BUL, rd 2, Oct-04
Sicilian Defense: Hyperaccelerated Dragon (B27)  ·  0-1


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Kibitzer's Corner
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Apr-04-06  WarmasterKron: I got this as soon as I realised that it was black to win. Nice to see my endgame knowledge isn't completely non-existant.
Apr-04-06  euripides: Rook versus 2 minor pieces can be very difficult to assess; perhaps Delchev overestimated the strength of the a pawn, or perhaps he went wrong somewhere in the endgame itself, where the tactics are continuously intricate and interesting (34 Ka1 and 50 Ra6 are both nice). I don't know if any book gives a good treatment of this material balance in the endgame ?
Apr-04-06  Cogano: Great endgame! I find it especially neat that, in order for Black to win, he actually has to sacrifice his only remaining piece -- even though, usually, having a piece is supposed to make queening a pawn a certainty! I'm glad I got it as soon as I saw the position! Either this was soooo easy or I must be improving under the guidance & instruction of <>! Thanks much to all at <>. :) Most obliged to you. :) Cheers! :)
Apr-04-06  NotABanker: Very easy. I saw it right off the bat.
Apr-04-06  jamesmaskell: Two days in a row now...yey me!
Apr-04-06  eaglewing: Question: From which point on the endgame was lost for White or was it always lost during its develoement since 27...fxg?

It seems to me that:
a) 42. Kb1 might be a lost tempo regarding Ka2 was played later on and

b) From 45.Rxg6 on a variant trying Rg8/a8Q/RxBa8/Rh8/Ka2/Kb3 just loses by one tempo

So how to invest tempo 42 better?
I suspect several holes but what about

42. Ra4 Ba8
(Kf5 Ka2 Bd5 Kb1 and Bd5 needs to be moved due to horizontal pin threat) 43. Rc4 Kf5
(Bg2 Ka2 Bd5 Ka3 wins a tempo, the king is one square nearer the c3) 44. Rc5+ Kg4
45. Rg5+ Kxh4
46. Rxg6 Kh3
47. Rg8 wins one tempo by threatening the Ba8 (which compared to the game would still be on g2)

47. ... Bg2
48. a8Q Bxa8
49. Rxa8 h4
50. Rh8 Kg2
51. Ka2 h3
52. Kb3 Be5
Now without the tempo gained, the game with the pawn already on h2 would be lost but here on h3 it seems to hold with

53. Rg8+ Kf2/f3
54. Rf8+ Ke2/e3/e4
55. Rf5/f1
I crosschecked this endgame position (but without the c2) in an endgame tablebase, indicating these results.

Do you see a winning variation for Black?

Apr-04-06  apawnandafool: There's no way I'd sacrifice a bishop just to promote some pawn, unless it was in the endgame. Bishops are cool.
Apr-04-06  iamverywellatchess: Black did not need the pawn! He wins the game anyways because of the guard advantage (up 8 points)! Not a good puzzele!
Apr-04-06  Richerby: You could always promote the pawn to a bishop, <apawnandafool>.
Apr-04-06  awfulhangover: In my opionion, there should be much more endgame puzzles here. At least 2-3 each week.
Apr-04-06  Zplane: What a slaughter! Whites 14th move landlocks it's B and appears to be a major blunder. Interesting end game. You would think white should have pushed it's pawn forcing the bishop sac but it seems it never had a chance.
Apr-04-06  Cogano: Just some info for the record:

In defence of <>: If anyone has reason to question how good the puzzles they post are, then these individuals are more than welcome to submit what they consider to be superior puzzles. :) Otherwise, be thankful that the folks at <> take the time to post as good puzzles as they can. :) & I'm sure many a user can & will testify to the fact that they've been immeasurably helped by them! :)

As for the frequency of the puzzles, in case certain users are new to the site & haven't noticed, there's a new <Game of the Day> & <Puzzle of the Day> <EVERY DAY> of the week!

Cogano :)

Apr-04-06  Halldor: Excellent demonstration of the deflection theme, I've never seen it as simple and clear.
Apr-04-06  jperr75108: Easy problem because its obvious the king wins after taking opposition.
Apr-04-06  SickedChess: quite easy two seconds to find!
Apr-04-06  euripides: Even easy puzzles can be useful, because they help to fix a basic pattern in the mind. This makes it more likely that, when you need to spot the idea 12-ply ahead, you succeed in doing so.
Apr-04-06  dakgootje: Pure intuition today, saw the puzzle and this obviouly was the first move considered.

I think personly i would have done this as a monday puzzle, instead of a tuesday, but well its chessgames decision ;-)

Apr-04-06  The17thPawn: Love this game! I think I may adopt the accelerated fianchetto into my own repetoire if it makes for exciting chess like this.
Apr-04-06  alexandrovm: nice ending puzzle
Premium Chessgames Member
  YouRang: Good puzzle -- I love endgame puzzles. But it was made simple because there really was no other viable move for Black to play!
Premium Chessgames Member
  Sneaky: While very easy it's not a motif that I'm particularly familar with. I'm glad I saw it today.
Apr-04-06  Jim Bartle: This is one of those games where it's much easier to find the right move when it's presented as a puzzle.

I found the answer in a second because Be5+ is the only move that isn't an immediate draw. During play I'm not so sure I'd see it...

Apr-04-06  Alterno: What coincidence: yesterday at the club I had a similar problem (somewhat more pawns). Saw this one in a fraction of an hour.
Premium Chessgames Member
  kevin86: This one was very easy. The text is the only move to save the pawn-and there was no winning without it. If white takes at e5,then Ke3 gains the fatal opposition.IF he refuses the sac the black bishop will hold his pawn while the black king elbows white's king away for the white pawn.
Apr-04-06  gerpm: I got it right away
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