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|Mar-21-10|| ||RandomVisitor: After 19...Bd6:
click for larger view
[+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
|Mar-21-10|| ||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.
|Mar-21-10|| ||ChocolateCakeLover: I did not get it. :)|
|Mar-21-10|| ||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.
|Mar-21-10|| ||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 Q-side. Under check, therefore, the Black Ke8 will flee through f8 to safety on the K-side. 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.
|Mar-21-10|| ||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 ;>)
|Mar-21-10|| ||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 0-0. Less snatching, more hearing the king's flight aids him.|
|Mar-21-10|| ||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 (Qa4-c6). 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.
|Mar-21-10|| ||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.|
|Mar-21-10|| ||patzer2: In the final position, after 22. Qc7! 1-0, 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).
|Mar-21-10|| ||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.|
|Mar-21-10|| ||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.
|Mar-21-10|| ||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.
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.
|Mar-21-10|| ||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?|
|Mar-21-10|| ||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...|
|Mar-21-10|| ||kramputz: The chess monster ate my post.|
|Mar-21-10|| ||Bondsamir: 20.Qa4+..Kf8,21.Qc6..Rd8,22.Qc7..Rd7,23.Qc8+..Ke-|
|Mar-21-10|| ||turbo231: My Rybka doesn't make the move Rd8, nor the move Kf8. That would be simple.|
|Mar-21-10|| ||nonmaster1781: <Mar-21-10a 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?
|Mar-22-10|| ||nonmaster1781: Mar-21-10 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 winning
maybe i missed something?>
|Jun-03-12|| ||vinidivici: dude, what happen if black trying to save his knight at #17 retreating to g8 (17....Ng8)?|
|Jun-03-12|| ||falso contacto: <vinidivici> 18.Qxd5, resign. (1-0) Mañana será otro día.|
|Jun-03-12|| ||falso contacto: Meaning "tomorrow will come" (awful). Today, not black's day.|
|Jan-09-18|| ||RayDelColle: Why doesn't black move 12) ... R x h2 (pawn) instead of b5?|
|Jan-09-18|| ||RayDelColle: Why doesn't white protect the h pawn?|
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