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Rune Hvalsoe vs Per Hansen
DEN-ch int U18 (1982), Soro DEN, rd 7
Sicilian Defense: Dragon Variation. Yugoslav Attack (B77)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Aug-26-15  patzer2: I also fired too early with 20. Rxg6+, when White is only up a pawn after 20...Bg7 21. Rxg7+ Qxg7 22. Qf2 Kh8 23. Qh4+ Qh7 24. Qxe7 f6 25. Bxd6 Bc6 26. Qxh7+ Kxh7 27. Bxf8 Rxf8 28. Bd5 Bxd5 29. exd5 (+0.77 @ 21 depth, Deep Fritz 14).

Instead the Wednesday puzzle solution and game continuation 20. Rxd4! forces 20...Qxd4 to prepare the decisive 21. Rxg6+!, when Fritz indicates it's mate-in-11 after 21...Qg7 22. Qg2! .

Black's decisive error was 18...Nxf4?, allowing 19. Bxf4! (+1.85 @ 21 depth).

Instead, 18...Kh8 19. Rd3! (+0.72 @ 20 depth) keeps Black in the game.

Earlier 16...Nxe3 (instead of 16...Nxb2?!) 17. Qxe3 Kh7 = would have improved and given Black fully level chances.

Aug-26-15  stst: Since Black got the mate Qa1 supported by B, White can take the B@d4 first: Two lines:
(I)
20.Rxd4 QxR (what else to compensate?)
21.Rxg6+ Qg7 (fP pinned by White's B)
If ..... Kh8, 2. Qh5#
22.RxQ KxR
23.Qh5 to close in....

(II) Give a direct check first:
20.Rxg6+ Bg7 (if .... Kh8, 21.Qh5#)
21.e5 (cut the link between Q and B) d5 (maybe)
22.Bxd5 etc
This line is not so effective....

Aug-26-15  Moonwalker: Hmm.. Would have expected 21...♕g7. Very obliging of black to walk right into the mate.
Aug-26-15  schachfuchs: hehe, I got it until 21...Qg7 but couldn't see the "mate-in-11 after 22. Qg2!" Hope this counts nevertheless?! ;-)
Aug-26-15  morfishine: White wins with <20.Rxd4> an indirect “remove the defender” theme that also eliminates all Black counterplay

*****

Aug-26-15  nisharaj31: I had the same chess blindness as Phony Benoni :(
Aug-26-15
Premium Chessgames Member
  agb2002: White is two pawns down.

Black threatens 20... Qa1#, 20... Qb2# and 20... Bxg1.

The hasty 20.Rxg6+ is met with 20... Bg7 (else 21.Qh5#). Therefore, 20.Rxd4:

A) 20... Qxd4 21.Rxg6+ Qg7 22.Qg2 Qxg6 23.Qxg6+ Kh8 24.Qh5+ (or 24.Bxf7 Rxf7 25.Qxf7 + - Q vs R])

A.1) 24... Kg8 25.Bh6 Kh7(8) (else 26.Qg5+ Kh7(8) 27.Qg7#) 26.Bxf8+ Kg8 27.Qxf7+ Kh8 28.Qg7(8)#.

A.2) 24... Kg7 25.Bh6+ Kf6 (25... Kg8 26.Qg5+ and 27.Qg7#; 25... Kh7(8) transposes to A) 26.Qg5#.

B) 20... Kg7 21.Rd3 + - [B vs 2P] and attack. For exanple, 21... Qc5 22.Rg5 Qc6 23.e5 dxe5 24.Bxe5+ f6 25.Rxg6+ Kxg6 26.Rg3+ Kf5 27.Qg4+ Kxe5 28.Re3+ Qe4 29.Q(R)xe4#.

C) 20... Kh7 21.Rd3 + - is similar to B.

Aug-26-15  morfishine: <schachfuchs> Well, starting with <20.Rxd4> and continuing 20...Qxd4 21.Rxg6 Qg7 22.Qg2 Qxg6 23.Qxg6+ Kh8 Black is kaput after <24.Bxf7> so I think it counts and no need to calculate 9 more moves
Aug-26-15  wooden nickel: Almost goofed this one up with 20.Rxg6+ Bg7 21.e5, but then Black just plays the simple 25... QxBb3+ after which 26.axQb3 and fxRg7 more or less equalizes... I was expecting 21... Bf5 which leads to an interesting position for White


click for larger view

...but not far as good as 20.RxBd4 immediately.

Aug-26-15  saturn2: So the black dragon beast on d4 has to be killed first.
Aug-26-15  CHESSTTCAMPS: White is down two pawns and faces direct mates threats (Qa1# and Qb2#), rendering the threat of 20... Bxg1 irrelevant. The simplest course for white is to chop the bishop and continue with a winning attack:

20.Rxd4! Qxd4 (e5? 21.Rxg6+ Kh8|h7 22.Qh5#) 21.Rxg6+ Qg7 (K moves 22.Qh5#) 22.Qg2! Qxg6 23.Qxg6+ Kh8 24.Bxf7 Rxf7 (otherwise 25.Qh6#) 25.Qxf7 wins.

Less convincing is 20.Rxg6+ Bxg7 21.e5 where black can complicate with e6 or Qxb3+.

Aug-26-15
Premium Chessgames Member
  whiteshark: <20.Rxd4!> removes the Dragon ♗
Aug-26-15  schachfuchs: ja morfishine, that's what I mean.
I would have been satisfied with the simple 22.Rxg7+, which also reduced the calculations for 20.Rxd4
Aug-26-15  lost in space: 20. Rxd4 and 21. Rxg6+ and thats it
Aug-26-15  starry2013: Penguincw: <Remember, when you get a choice between 2 moves, play the one that is more forceful.>

I did the forceful move Rxg6 and it didn't work. So it seems from the posts here like the indirect move Rxd4 was the right one. I couldn't get the moves to win against the computer with Rxg6 anyway.

Aug-26-15  patzer2: Black was thinking if I remove the White Bishop's guard with 18...Nxf4?, I win a pawn after 19. Bxf4 Bxd4.

White was thinking if I remove the Black Bishop's guard with 20. Rxd4!, I win a King after 20...Qxd4 21. Rxg6+ .

Aug-26-15
Premium Chessgames Member
  kevin86: Chop off the bishop and force mate with rook and queen.
Aug-26-15  jith1207: Good point, <pATZER2>.

Sadly, Black opted to sacrifice his king in order not to lose the queen. May be, opted for a quick end after Rxd4!

Aug-26-15  HowDoesTheHorsieMove: First one I got this week, and probably the last. It still feels good!
Aug-26-15
Premium Chessgames Member
  Jimfromprovidence: I got 20 Rxd4 Kg7 Be3.


click for larger view

Still work to do.

Aug-26-15
Premium Chessgames Member
  Penguincw: < starry2013: Penguincw: <Remember, when you get a choice between 2 moves, play the one that is more forceful.>

I did the forceful move Rxg6 and it didn't work. So it seems from the posts here like the indirect move Rxd4 was the right one. I couldn't get the moves to win against the computer with Rxg6 anyway. >

Sorry, I was referring to what to play after 20.Rxd4 Qxd4. Let's just say that's a general statement.

Aug-26-15  M.Hassan: "Medium/Easy"
White to play 20.?
White is 2 pawns down.

I thought of the obvious 20.Rxg6+
If 20......Kh8/h7
21.Qh5#

What if 20.......Bg7
Mate can not be achieved and there is still threat of mate by Black Queen on a1/b2. So, one of the long diagonal predators have to be removed and it is the Bishop on d4:

20.Rxd4 Qxd4
21.Rxg6+
and mate next move

Aug-26-15  starry2013: With these kind of puzzles there isn't a straightforward checkmate against a computer, so that makes judging and playing the best line difficult for me. It looks like the computer will give up its queen quicker with the rxg6 line. In both lines a white rook seems to get exchanged for black queen. Plenty of play though, not a checkmate puzzle.
Aug-26-15  CHESSTTCAMPS: <Jimfromprovidence> and <agb2002> appear to have found the best defense (20... Kg7), which I did not consider.
Aug-26-15
Premium Chessgames Member
  gawain: Count me among those who wrongly imagined that 20.Rxg6+ Bxg7 21.e5 would win.
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