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Vladimir V Kravchenko vs Evgeny E Vorobiov
Kaissa CC (2000), Kharkov UKR, rd 4
Philidor Defense: Larsen Variation (C41)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 1 OF 2 ·  Later Kibitzing>
Oct-02-07  ericlgame: Second, :)
Oct-02-07  not yet a patzer: YES!

KxR Rh4#

Got it and got it quickly. A strong recovery after missing yesterday's.

Oct-02-07  TrueBlue: yes, I solved a Tuesday, in your face :)
Oct-02-07  Tactic101: Rxh7+! with mate. What we would expect of a Tuesday.
Oct-02-07  Zorts: Why didn't black simply block 29...Re8? It's not a winning move but still.
Oct-02-07  willyfly: Material is equal and Black's ♕ is really hedged in on the a-file while White has an advanced passer on the e-file which is good position to fork Black's ♘ and ♖ and possibly promote - if it were not for Black's a6♖. However - Tuesdays are frequently ♖ sac days so how about...

33 ♖xh7+ ♔xh7 34 ♖h4+ ♔g7 35 ♕h8#

Oct-02-07  MostlyAverageJoe: <not yet a patzer> Hey, I am not picking on you, really. But the complete checkmate needs one more move. Here's the full line:

33. Rxh7+ Kxh7 34. Rh4+ Kg7 35. Qh8#

I think today was easier than yesterday (and Hiarcs agrees). One rather interesting (mis?)behavior that I've noticed is that in the initial position, the engine finds the mate in 7 seconds (at its lowest ELO setting), but after 33. Rxh7+ Kxh7, it fails to continue along the previously discovered line!

While I have some vague idea why this might happen, I am a bit unsure how this affects my approach to puzzle difficulty evaluation. I'll have to sleep on this and ponder.

Oct-02-07  Confuse: I agree MostlyAverageJoe. Taking that long on a Monday puzzle almost made me quit chess. : P just kidding, but yeah todays was much easier. Hooray for life!
Oct-02-07  Fezzik: The term "CC" in a tournament is sometimes used to denote a correspondence tournament.

I hope that here it merely means "Chess club". How else can one explain a 2300+ elo player falling for this simple combination?

Oct-02-07  syracrophy: But if we see every move from move 31, all is forced! 31.♕d8! forces the ♖ to move to f7, since he can't abandon the ♘. 32.♖g4! gains an important tempo by attacking the queen and allowing now the following combination, since the ♙ on g6 was covering the <h5> point, and the ♖ now has the <h4> point free. 33.♖xh7+! the decisive destructive blow. The h-file is now open for the other ♖ to make his job. 33...♔xh7 34.♖h4+ ♔g7 35.♕h8#
Oct-02-07  jimy1968: 29...,Nd8 with some more time
Oct-02-07  dzechiel: Pretty easy, saw it in just a couple of seconds. Spent most of my time looking all over the board for the remote bishop that was going to quash my combination.

<MAJ> has posted the line, and it's 100% forced.

I am curious why this three move combination should feel easier than the two-mover yesterday (especially for software).

Oct-02-07  jimy1968: i met 29...,ne8
Oct-02-07  jimy1968: would give black some more time to organize
Oct-02-07  MostlyAverageJoe: <jimy1968> Or 30 ... Ne8 with yet more time.
Oct-02-07  MostlyAverageJoe: <syracrophy> the mate is not really forced from move 31. Black had an option to exchange his Q for white R and avoid an immediate mate :-)
Oct-02-07  MostlyAverageJoe: <dzechiel: I am curious why this three move combination should feel easier than the two-mover yesterday (especially for software)>

For software it is clear - sacrificing a rook is considered before sacrificing a queen. Yesterday, Hiarcs went into exactly the same lines that some of the kibitzers did: first it wanted to play Rxf8, then Nf7, and finally found Qh8. De-rating the engine's performance (if engine implements it reasonably correctly, as in Hiarcs - by slowing down the computations) is a great way of learning how they search the solution space.

For humans, I am not sure why today feels easier. For me, it was the recognition of the mating pattern where king on g7 is blocked by its own pieces from escaping to g6 and f7, and white Q on h8 takes care of the rest, so the question was: how do I get my Q there without letting the blocking pieces move. Maybe yesterday's back rank mate (a variation on Anastasia's mate) is less familiar.

Oct-02-07  not yet a patzer: <MAJ> You see, this is my problem. I did not consider g7 as an escape for the king, because a piece was already there. Of course when the king moves to h7 to capture the rook, then g7 is open, and he can move back out of check from the rook on the h-file.

I think maybe I would do a little better at this if I used a board instead of trying to keep track of everything in this seive that used to be a brain.

And it's okay, pick on me all you want.

Oct-02-07  MostlyAverageJoe: <not yet a patzer: <MAJ> You see, this is my problem...>

I replied here: not yet a patzer chessforum.

Oct-02-07  mkrk17: Isn't Rxg6+ winning too.. ?
Oct-02-07  MostlyAverageJoe: <mkrk17: Isn't Rxg6+ winning too.. ?> Look at what's waiting on the square a6 to pounce on that move.
Oct-02-07  Squares: See where black's other Rook is.
Oct-02-07  Squares: On move 28 Rf7 seems better for black.
Oct-02-07  krusheto: Missed it yesterday like a complete idiot. Today's puzzle though seems easier. I don't know why. Maybe it's because it involves a pseudo sacrifice and that's what I first look for to solve a puzzle. And I have no excuse too - Monday is a queen sac day... I guess this is just a result from the countless nights spent in the library studying lol
Oct-02-07  Aurora: Simple. 33.Rxh7+ KxR 34.Rh4+ Kg7 35.Qh8#
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