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Mar2110   tarek1: <scormus> A strong woman GM was once asked "who's your favourite female chess player ?" and she answered "Rybka !".
I guess it's because Rybka is a feminine word in Russian. 

Mar2110   Jamboree: So, summing up all the comments above: There seem to be at least FOUR different winning moves: Qa4+
Qc3
Re1+
f4 Problems are better when there's only one definitive solution! 

Mar2110
  RandomVisitor: After 19...Bd6:
click for larger view Rybka 3:
[+6.45] d=17 20.Qc3
[+5.99] d=17 20.Qa4+
[+4.53] d=16 20.Qc2 Bxb4 21.Qc6+ Nd7 22.Qxa8+ Qb8 23.Qxd5 Qd6 

Mar2110   tarek1: <Jamboree>
Nobody claimed Re1+ was a winning move.
It's even a bad move, allowing black to improve his king by Kf8.
As for f4, it's playable but not the last nail in the coffin, so it can't be really considered as a solution.Moreover, multiple solutions are not a problem if they're all correct.
Solving the puzzle is not finding every and all possible solutions, but finding just one that is correct. 

Mar2110   ChocolateCakeLover: I did not get it. :) 

Mar2110
  patzer2: Had to check twice to see if it was Sunday after quickily finding the puzzle solution 20. Qa4+!!, which sets up a winning double attack and pin combination after 20...Kf8 21. Qc6 Rd8 22. Qc7! . Perhaps yesterday's GOTD, in which Fischer made two consecutive Queen moves to win against Benko, provided a clue. According to <RV>, <dziechiel> and <Jamboree>, three other moves also win. However this seems to be the simplest and most forcing line. 

Mar2110
  johnlspouge: Sunday (Insane):
Z Izoria vs F Volkmann, 2003 (20.?) White to play and win.
Material: B for N. The Black Ke8 has 4 legal moves, but is vulnerable to checks from Qb3, Rd1, and Bf1. The White Bb4 attacks Bd6, which forms a mutually protective rubber band with Qh2. The Black Ra8 is loose and undeveloped, like Nf6, so White has a local superiority on the Qside. Under check, therefore, the Black Ke8 will flee through f8 to safety on the Kside. Thus, the candidate 20.Qa3 appears attractive. The White Kb1 is secured from check. Candidates (20.): Qa3
I went for 20.Qa3, finding lines that Toga evaluated at +1.6 P. 

Mar2110
  johnlspouge: < <Jamboree> wrote: [snip There seem to be at least FOUR different winning moves:
Qa4+ Qc3 Re1+ f4 >
At least FIVE, with Qa3. Maybe the puzzle would be more challenging if you had to find a move that did NOT win ;>) 

Mar2110
  chrisowen: I cannot wait ages Qa4+ is hoarier inflecting terminal damage. Then you flew your king into the foothold Kf8 where he strategically dipped the queen. Reguarding Qc6 is a pry cottoning on to the fact it was Freidrich who wears the scar for hating a 00. Less snatching, more hearing the king's flight aids him. 

Mar2110
  agb2002: White has the bishop pair for a bishop and a knight and virtually an extra pawn (on the queen side). Black threatens 20... Rb8, alleviating somewhat the pressure. The king in the center, the weak queen side and the loose pieces on a8 and d6 invite White to consider and invasion with the queen (Qa4c6). Therefore, 20.Qa4+: A) 20... Kd8 21.Qc6 Bxb4 22.Qxa8+ Kc7 (22... Kd(e)7 23.Qb7+ and 24.Qxb4 + ) 23.Rc1+ Kb6 (23... Kd6 24.Qb8+ and 25.Qxa2 + ) 24.Qc6+ Ka5 25.Qb5#. B) 20... Kf8 21.Qc6 Rd8 (21... Bxb4 22.Qxa8+ Ke7 (22... Ne8 23.Bb5 + ) 23.Qb7+ and 24.Qxb4 + ) 22.Qc7 (cross pin) B.1) 22... Rd7 23.Qb8+ Ke7 (23... Ne8 24.Re1 Re7 25.Bxd6 + ) 24.Re1+ Ne4 25.fxe4 Qg3 26.Bxd6+ (26.exd5+ Qxe1+ 27.Bxe1 Bxb8 / +) Rxd6 (26... Qxd6 27.exd5+ Kf6 28.Qxd6 Rxd6 29.Bc4 +  [B+P]) 27.Rc1 +  [B], White has a winning attack. B.2) 22... Ne8 23.Qxd8 Bxb4 24.Bb5 + .
B.3) 22... Ke8 23.Bb5+ and 24.Bxd6 + .
C) 20... Ke7 21.Re1+ with lines similar to A or B.
D) 20... Nd7 21.Qc6
D.1) 21... Bxb4 22.Qxa8+ and 23.Qxd5 +  [R+P vs N].
D.2) 21... Rd8 22.Bxd6 +  and 23.Re1+, winning. 

Mar2110
  agb2002: 23.Qb8+, line B.2, is a blunder which loses most advantage (the bishop is also defended by the knight after 23... Ne8 24.Re1 Re7). The simple 23.Qc8+ wins. 

Mar2110
  patzer2: In the final position, after 22. Qc7! 10, Fritz 10 provides the following winning lines: 22...Rd7 23. Qc8+ Ke7 (23... Ne8 24. Qxd7 Bxb4 25. Bb5 Qb8 26. Rh1 Nf6 27. Rh8+ Ng8 28. Bd3 Ba3 29. b3 Qd6 30. Qc8+ Ke7 31. Rxg8 ) 24. Re1+
Ne4 25. Bxd6+ (even stronger is 25. Bb5! Bxb4 26. Qxd7+ Kf6 27. fxe4 ) 25... Qxd6 26. fxe4 (+6.79 @ 19 depth). 

Mar2110   butilikefur: <20. Qa4+ Kf8> 20...Ke7 21. Qc6 Rd8 22. Qc7+ Rd7 (or 22...Nd7) 23. Re1+ wins <21. Qc6 Rd8 22. Qc7 Rd7 23. Qc8+ Ke7 24. Re1+ Ne4 25. Bxd6+ Qxd6 26. fxe4> ..a little too simple, there must be a stronger defense. 

Mar2110
  chessgames.com: Our computer analysis showed that Qc3 is exactly equal in strength to Qa4+, because when both sides play the strongest moves the lines transpose into one another. There are some other good moves in addition to Qa4+/Qc3, but they are distinctly inferior, giving Black too many resources. To have solved the problem, you should have seen that in the final position the obvious defense of ...Rd8 is met with Qc7!! winning. We thank <tpstar> for pointing out this beautiful combination. 

Mar2110
  David2009: Sunday 21/03/2010 Z Izoria vs F Volkmann, 2003 White 20? Insane A quick glance. How about 20 Qa4+ Kf8 (if Kd8, Qc6 forks R and B) 21 Qc6 Rd8 22 Qc7 Rd7 23 Qb8+ etc.
No time for more. There are probably other defences.
Check:
=====
Spot on  a successful gamble. Win some (today) lose some (Saturday, Friday). NB Black resigned very quickly IMO. Surely there is still play in the position? I'll check against Crafty later  off now. 

Mar2110
  watwinc: Qc7 Rd7 Qc8+ Ne8 Re1 Re7 Bb5 Re1+ Be1 Ke7 Qe8+ Kf6 Qd8+ Be7 Qd5 (threat Bh4+) looks pretty much forced. Any improvements, please? 

Mar2110   WhiteRook48: the 20 Qa4+ and Qc6 idea was insane? come on that was medium, i got it in 6 seconds. Of course i probably missed something though... 

Mar2110   kramputz: The chess monster ate my post. 

Mar2110   Bondsamir: 20.Qa4+..Kf8,21.Qc6..Rd8,22.Qc7..Rd7,23.Qc8+..Ke
7,24.Re1+.. 

Mar2110   turbo231: My Rybka doesn't make the move Rd8, nor the move Kf8. That would be simple. 

Mar2110   nonmaster1781: <Mar2110a gb2002: 23.Qb8+, line B.2, is a blunder which loses most advantage (the bishop is also defended by the knight after 23... Ne8 24.Re1 Re7). The simple 23.Qc8+ wins.> i also looked at the line 23.Qb8 but i dont think it is a blunder.
23.Qb8 Ne8 24.Bb5 i think white is winning
maybe i missed something? 

Mar2210   nonmaster1781: Mar2110 nonmaster1781:
<i also looked at the line 23.Qb8 but i dont think it is a blunder. 23.Qb8 Ne8 24.Bb5 i think white is winningmaybe i missed something?>
24...Re7 

Jun0312   vinidivici: dude, what happen if black trying to save his knight at #17 retreating to g8 (17....Ng8)? 

Jun0312   falso contacto: <vinidivici> 18.Qxd5, resign. (10) Mañana será otro día. 

Jun0312   falso contacto: Meaning "tomorrow will come" (awful). Today, not black's day. 


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