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Wan Yunguo vs Shakil Abu Sufian
8th Asian Continental Chess Championship (2009), Subic Bay Free Port, rd 6, May-18
Sicilian Defense: Old Sicilian. Open (B32)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 4 OF 4 ·  Later Kibitzing>
Nov-19-10  CHESSTTCAMPS: <Jimfromprovidence:> In fact, I think this is a very clean, technical way to win and Crafty EGT can't improve black's play in your line.
Nov-19-10  gmalino: 24.e5 dxe5 (forced because of Qf6+, mate follows) 25.Qxe5+ f6
26.Rxd7+ Kg8
27.Qh8#

If black plays Kf8 on move 25

26.Rh7 is the killer

Nov-19-10  scormus: <Jimfromprovidence:> Great find! Right line, wrong day ;-)
Nov-19-10  MaczynskiPratten: <Cardinal Fang, Once>; One nice piece of musing on "to resign or not to resign" is Anand's in A Zapata vs Anand, 1988 after he reached a losing position on move 6. The story of how he came to do so is also rather amusing ... see the kibitzing ... basically don't believe everything you read in books or even Informator!
Nov-19-10  Martha Stewart: I found 24. Rh7+ Kh7 25. Qf6 puts a quicker pin on the king, with no where to run. 25.. Qe3+ creates a small but insignificant delay.
Nov-19-10  Sleeping kitten: I did'nt see the mate after 29. ♕g5+, so I chose the longer 29. ♖e1+ ♔f2 30. ♕h4+ ♔xg2 31. ♕g4+ followed by 32. ♖e2+ and a mate on g2 within two moves. Efficient, but not very graceful.

By the way, I always resign late, but before mate. In fact, I resign when I think my opponent advantage has grown so big that he won't have to afford any more work to win. Not before and not after.

Nov-19-10
Premium Chessgames Member
  sethoflagos: I got 24. e5

Discounting the sacrificial continuations such as 24..Qf3+ (a dyed in the wool dragonista, black's position is all too familiar to me and too slow), I looked at a couple of key defences:

24...dxe5 25 Qxe5+ f6 (25...Kf8 26 Rh8+ Ke7 27 Qg5+ f6 28 Rh7+ Kd8 29 Rdxd7+ Ke8 30 Qxg6+ Kf8 31 Qf7#) 26 Rxd7+ Kg8 27 Bxe6+ Qxe6 28 Qxe6+ Kf8 29 Rh8#.

24...f5 25 Qh6+ Kf7 26 Qh7+ Kf8 27 Qh8+ Kf7 28 Rh7#

24... Kg8 25 Qf6 Qe3+ I didn't analyse out (see above)

I didn't see 24 Rh7+!

Nov-19-10  DarthStapler: I got the first move
Nov-19-10  weary willy: <Martha Stewart: I found 24. Rh7+ Kh7 25. Qf6 puts a quicker pin on the king, with no where to run.> 25 .... Qc5?!
Nov-19-10  wals: Not even close.

Rybka 4 x 64

depth: 19 : 6 min :
White error
(=0.12):17.h5. Best, axb4, + 0.73.

depth: 17 : 6 min :
Black error
(+0.62):18...Qb6. Best, bxa3, =0.00.

depth: 18 : 3 min :
White error
(=0.00):19:b3. Best, 0-0-0., +0.62.

depth: 18 : 6 min :
Black blunder
(+3.74):20...Rfc8. Best, Qc5, -0.12.

depth: 16 : 5 min :
Black blunder
(+#31):21...hxg6. Best, h5, +3.74.

23...Kg7, (+#8), hastened the end,
Ke7, (+#26), would have delayed it.
depth: 18 : 10 min :

(#26) 23...Ke7 24.Qg5+[] f6 25.Rh7+[] Kd8 26.Qxf6+[] Kc7 27.Rxd7+[] Kxd7 28.Qxe6+[] Kd8 29.Rxd6+[] Qxd6 30.Qxd6+ Ke8 31.Be6[] Rb7 32.Bxc8[] a2 33.Qxg6+[] Kd8 34.Qg8+[] Kc7 35.Kb2 Rb4 36.Kxa2 a4 37.Qf7+ Kb8 38.Qf4+ Ka8

Nov-19-10  scormus: <weary willy: 25 .... Qc5?!>

26 Qxf7+ perhaps?

If instead 25 ... Qe3+ 26 Kb1 Rf8 27 Rh1 Qh6 and B survives, I think slightly better

Nov-19-10  YoungEd: When YoungEd gets a Friday puzzle right, something is amiss. Maybe it's not really Friday...
Nov-19-10
Premium Chessgames Member
  Jimfromprovidence: <CHESSTTCAMPS> <In fact, I think this is a very clean, technical way to win and Crafty EGT can't improve black's play in your line.>

Thanks. I wish I had had the vision to see 24 Rh7+ with the forced mate, or 24 e5. I missed both.

FWIW, Rybka freeware finds a nice improvement in my line with 30 f4!


click for larger view

This move blocks the black queen from getting to g6 after 30...exf4 31 Qh4+. (since 30...Qxf4 31 Rf1 wins the queen).

Nov-19-10  lzromeu: I found a funny king hunt.
Start: e5, dxe5
End: 34 Qe1#
Nov-19-10  ruzon: <Martha Stewart: I found 24. Rh7+ Kh7 25. Qf6 puts a quicker pin on the king, with no where to run. 25.. Qe3+ creates a small but insignificant delay.>

I thought so too, but after 26. Kb1 Qh6! White is busted.

Nov-19-10  BOSTER: <Once> <The sytrategic plan is clear- you are going to lose> After reading your lecture about defeat I have to say,that such deep knowledge in this field, your unique experience impress'es.
Nov-19-10  JeanGiskan: 24. Rh7+ is without any doubt the strongest move. But after contemplating the position for about 20 seconds i opted for 24.Rd6:. Absolutely sound, winning the game, and, from a practical point of view, much more effective. I lost a lot of games because I was somehow ''lost in combination''. ( zeitnot). During a real game there is noone standing near you, whispering '' hey, there s a pretty nice combination here, don t you see it?'' And 24. Rd6 is a winning move, it s only drawback is that it isn t the fastest one on the road to checkmate
Nov-19-10  WhiteRook48: I epically failed
Nov-19-10  euripides: 28.Rh4+ also seems to do the job.
Nov-19-10  James Bowman: Rh7+ took about ten seconds, simply because it's obvious all black protection is on the queens side isolated by his own pawns and also white has another rook to join in the fray plus a light squared bishop to boot. On move 27 I thought h4+ was best but after running in cirlces for about 10 moves I think Wan Yunguo did much better so I guess I will give myself a c+ as I could have still one just too many moves to get there.
Nov-19-10  Eduardo Leon: White can force things for three moves with the following evident rook sacrifice:

<24.♖h7+ ♔xh7 25.♕xf7 ♔h6 26.♖h1+ ♔g5>


click for larger view

So far, so good. But now white must avoid 27.f4+?? ♔g4 28.♗e2+ ♔g3 29.♖h3+ ♔xg2 30.♕xg6+ ♖xh3 31.♕g4+ ♔h2 32.♕h4+ ♔g2, getting nothing more than a draw. (I am not sure what the result of 29...♔f2 would be, but, if I were black, I would rather err on the safe side and take the draw.) This line shows that the white queen is somewhat misplaced at f7, and the following move prepares her comeback through the dark squares:

<27.♕e7+! ♔f4 28.♕f6+ ♔e3 29.♕g5+>

Now there are two possibilities. The first one is:

<29...♔f2 30.♕d2+ ♔g3 31.♖h3#>


click for larger view

And the other one is:

<29...♔d4 30.♖d1+ ♔c3 31.♕d2#>


click for larger view

Nov-19-10  SuperPatzer77: <Eduardo Leon - 29...Kf2 30.Qd2+ Kg3 31.Rh3#>

29...Kf2, 30. Rf1# instead of 30. Qd2+. 1-0

SuperPatzer77

Nov-19-10  CHESSTTCAMPS: <Eduardo Leon> <But now white must avoid 27.f4+?? Kg4 28.Be2+...>

In this line, the lemon is not 27.f4+, but 28.Be2+??. White forces mate with 28.Qxg6+ Kxf4 29.Qf6+ (or 29.Rf1+). See post by <agb2002> among others.

Nov-19-10  Eduardo Leon: <SuperPatzer77>, <CHESTTCAMPS>, thanks for the corrections.
Nov-20-10  patzer2: I took a different approach in solving yesterday's Friday puzzle with 24. Rxh7+! Kxh7 25. Qxf7+ Kh6 26. Qf6! .

It doesn't lead to a forced mate, as in the game continuation and other lines so well analyzed here. Yet, it is still winning.

Now several posters have pointed out 24. Rxh7+! Kxh7 25. Qh6? loses to 26...Qe3+! 27. Kb1 Qh6! and they're absolutely right. However the line with 24. Rxh7+! Kxh7 25. Qxf7+ Kh6 26. Qf6! is significantly different, as it leaves Black with a lost game even after the best reply 26...Qe3+.

After 26...Qe3+ 27. Kb1 a2+ 28. Kxa2 Rc5 29. g4! Rh5 30. gxh5 White is clearly winning.

P.S.: Because the forced mate line with 26. Rh1+! is still the strongest line, leading to a quick pursuit mate in the middle of the board after 26...Kg5 27. f4+! or 27. Qe7+!, I've classified it as such in my tactical game collections.

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