< Earlier Kibitzing · PAGE 3 OF 3 ·
|May-26-10|| ||agb2002: Black has a rook for a knight and two pawns.
White threatens 63.Nxa6.
The black king is stalemated so that Black can draw at least with 62... Rf7+ 63.Kxf7 (63.Ke8 Qc6+ 64.Kxf7 transposes to the main line; 64.Nd7 Qe6+ 65.Qe7 Qxe7#) Qg6+ 64.Ke7 (64.Kf8 Qf7+ =) Qf7+ 65.Kd6 Qd5+ 66.Kc7 (66.Ke7 Qf7+) Qc6+ 67.Kxc6 =.
Other moves lose:
A) 62... Qa2 63.Qc7+ Ka8 64.Qb7#.
B) 62... Qb6 63.Qd7+ Kb8 (63... Ka8 64.Qd5+) 64.Qe8+ Kc7 (64... Ka8 65.Qa4+ Kb8 66.Nd7+) 65.Qd8+ Kc6 66.Qa8+.
C) 62... Qc6 63.Qa5+ Kb8 64.Nd7+ Kb7 (64... Kc8 65.Qd8+ Kb7 66.Qb8+ Ka6 67.b5+ Qxb5 68.Qa8#) 65.b5 Rf7+ (65... Qg6 66.Nc5+ Kb8 67.Qd8+ Ka7 68.Qc7+ Ka8 69.Qb7#) 66.Kxf7 Qxd7+ 67.Kf6 with a won endgame.
|May-26-10|| ||gofer: I can see no vistory for black, the queen must move and the only real option is Qb6 as it stops
62 Qc7+ Ka8 63 Qb7#. But Qb6 quickly turns into disaster...|
62 Qb6 Qd7+
63 Kb8 Qe8+ (Ka8 loses to Qa4+ Kb8 Nd7+)
64 Kc7 Qd8+ (Ka7 loses to Qa4+ Kb8 Nd7+)
65 Kc6 Qd7#
So we must be looking for a stalemate...
62 ... Rf7
63 Kxf7 Qg6+ (Kf8 Qg8+)
64 Ke7 Qf6+
65 Kd7 Qc6+
66 Ke7 and stalemate will ensue...
63 Ke8 Qc6+ (Nd7 Qe6+ winning! Qd7 Rxd7 winning!)
64 Kxf7 transposing as above
Time to check...
|May-26-10|| ||stacase: It took a minute or two to remember this week's theme. Then it was only a matter of figuring out how to force White to take both the Queen and Rook leaving the stalemated King.|
|May-26-10|| ||wordfunph: stalemate after sacrificing rook and queen..
i think the key move is 62...Rf7+!
|May-26-10|| ||zb2cr: With a stalemated Black King, the problem is to find out how we can throw away both the Rook and the Queen without allowing White to move his Knight or Queen. 62. ... Rf7+; 63. Kxf7, Qg6+ is the right beginning. Now White must play 64. Ke7 if he wishes to avoid the draw (64. Kf8, Qg8+ transposes). Now Black plays 64. ... Qf7+; 65. Kd6, Qd5+ and now White has three choices: |
a. The immediate capture on d5 leads to stalemate right away.
b. 66. Kc7, Qc6+! forces White to take the Queen with his King and it's finally stalemate.
c. 66. Ke7, Qf7+ with a perpetual instead of stalemate.
|May-26-10|| ||LIFE Master AJ: I think I smell another stalemate coming ... what is this, DRAW WEEK?!???|
|May-26-10|| ||johnlspouge: Wednesday (Medium/Easy)
Pribyl vs A Ornstein, 1977 (62...?)
Black to play and draw.
Material: R for N+2P. The White Ke7 has 2 legal moves and is vulnerable to checks from both Qa6 and Rf3, all checks inviting immediate capture, however. White threatens Nc5xa6, so Black must defend or counter-attack the White Qd8 or Ke7. The Black Ka7 is stalemated, suggesting that Black should seek stalemate, our theme of the week. Both the White Nc5 and Qd8 contribute to the immobility of the Black Ka7, so Black must offer Qa6 and Rf3 to Ke7 or the White Ps. The Qa6 is easier to give away, so the stalemate probably starts with Rf3.
Candidates (62...): Rf7+
62…Rf7+ 63.Kxf7 [Ke8 Rf8+ 64.Kxf8, to avoid repetition, is similar]
For each square on the 7th or 8th ranks to which the White K can flee, the Black Qa6 has a square on the 6th rank to give check, where neither Nc5 nor Qd8 can capture or interpose. (Certain of the squares even permit a Godfather sacrifice, a Q offer that cannot be refused, on the 7th rank immediately after.) The only exception is c8, to which the K can only arrive through the sequence
 Kd7 Qd6+  Kc8 Qb8+  Kd7 Qd6+
The sequence only permits repetition or return to e8, where the chase continues with Qg6+, etc.
|May-26-10|| ||CHESSTTCAMPS: White has a knight+2 pawns for a rook and serious winning chances thanks to the two passed pawns and the restricted mobility of BK and the attacked Qa3. With no winning chances if queens were exchanged, black is happy to force a draw, of course. Knowing the theme that has been running this week, I came up with a forcing solution pretty quickly:|
62... Rf7+! 63.Kxf7 (Ke8 Qc6+ 64.Kxf7 transposes) Qg6+! 64.Ke7 (Kf8 Qf7+ draw) Qf7+! 65.Kd6 Qd5+ 66.Kc7 (Ke7 Qf7 ) Qc6+ draw.
62... Qc6 and 62... Qb5 are the only other moves that avoid quick mate or loss of material, but I'll refer to other posts to see if a different draw can be proven.
|May-26-10|| ||CHESSTTCAMPS: The note to 66. should have read (Ke7 Qf7+ =). In the preview, I missed the symbol conversion when a space is omitted.|
|May-26-10|| ||DavidatHunter: I got it quickly, but only because stalemate appears to be this week's theme, otherwise I would have been looking for some sort of (illusory) mating combo. Doubtful I would have ever seen this in a real game!|
|May-26-10|| ||A Karpov Fan: got it (boring week so far :-()|
|May-26-10|| ||chrisowen: Not a differential approach, Ornstein uh lend beck and call for equating draw. Curve constant model of attack proposing we nervously process the checks. Stock Rf7+ as ticking off, string together 63..Qg6+ 64.Ke7 Qf7+ 65.Kd6 Qd5+ drift of queen terminate king's distribution. Dexterous rook fiddles the gap and intergrates queen sustaining it until king's parameters slowly hinder.|
|May-26-10|| ||kevin86: White is forced to draw in three ways:
66 xd5}-surrendering to the stalemate.
66 c7 c6+ 67 xc6...per force.
66 e7 f7+ 67 d6 d5+...by repitititititition
|May-26-10|| ||zooter: Another stalemate?
Though black is up the exchange he is being dangerously hounded and the 2 pawns are bound to count sooner or later
62...Rf7+ and now if
a) 63.Kxf7 Qg6+ forces a draw
b) 63.Ke8 Rf8+ 64.Kxf8 (forced) Qh6+ with a draw
Time to check
|May-26-10|| ||DarthStapler: Got it, although I wasn't sure at first if I was going for a draw or a win|
|May-26-10|| ||belgradegambit: Got it like the others here only because I knew the theme.|
|May-26-10|| ||SensibleHippy: Like a lot of people I found the idea of Rf7+ and Qg6+ to draw very quickly as this seem to be the theme this week. But I do not find these types of problem boring! They demonstrate how easy it is to "switch off" when you have a completely won game and blunder.|
Playing Black in a game earlier this year, I had the following position:
click for larger view
I was just about to play the "obvious" pawn move g3 which looks like it wins easily, but at the last moment noticed that White has the move Qh7+ which immediately draws, so fortunately I was able to play Ng6 instead. You might not immediately notice that a good-looking move like g3 stalemates the White King.
|May-26-10|| ||dzechiel: <SensibleHippy: ... Playing Black in a game earlier this year, I had the following position ...>|
I would have continued 1...Qg3+ followed by 2...Qf3+ to eliminate any further cheapos. But, in any case, "good eye" for spotting the swindle and not falling into it.
|May-26-10|| ||ajk68: Stalemate puzzles really need to be mixed in with winning puzzles. It makes them slightly more useful as practice.|
|May-26-10|| ||LIFE Master AJ: The correct continuation HAS to be 62...Rf7+! (White actually loses if he does not take the Rook.)|
Then 63...Qg6+. After this, there are several ways to draw.
Several kibitzers have fallen into the trap of checking at d6 with the BQ. (In some lines.) This usually fails completely, because White can recapture with the Queen itself, thus lifting the stalemate ... so a little care is needed.
|May-26-10|| ||mworld: knowing its stalemate week is the ONLY reason this is easy. I tried to look at this puzzle like any other 'normal' one and I tell you its pretty hard to think through all the forcing lines of Qf6+ and convince yourself that if a GM was thinking through them that he might not find a mate in the end.|
|May-26-10|| ||wals: Rybka 3 1-cpu: 3071mb hash: 19:
Black, a Bishop for a Knight, down two pawns, blunders,
White, material ditto, blunders,
+3.71 41.Kf5. Much better was, Rd4,+5.04.
41. Rd4 Rxd4+ 42. Nxd4 Kc8 43. e6 fxe6 44. Nxe6 Bb6 45. g5 Kd7 46.
Ke5 Ke7 47. g6 Ba7 48. b4 Be3 49. Nc7 Kf8 50. Kf5 Kg8 51. a4 Kf8 52. Nxa6 Ke7
53. a5 Bd2 54. Nc7 Kd7 55. g7 Bxb4 56. g8=Q (+#8)
|May-26-10|| ||M.Hassan: <scormus:......if the stalemate puzzles were without warning. If I hadn't expected it I wonder how long it would have taken me to figure out that 1/2 is the best B is going to get>
Absolutely! You shot the ball in the net!!. I found it relatively easy because I knew this is apparently the stalemate week|
|May-26-10|| ||SuperPatzer77: <dzechiel: <SensibleHippy: ... Playing Black in a game earlier this year, I had the following position ...>
I would have continued 1...Qg3+ followed by 2...Qf3+ to eliminate any further cheapos. But, in any case, "good eye" for spotting the swindle and not falling into it.>|
Hey, <dzechiel>!! How've you been doing?? You got it right. The player on the side of Black has to be extremely careful of the swindle so, he/she shouldn't have played g3???.
Well, we must not be overconfident like this if we have a winning hand so, we better not let a win slip.
|May-26-10|| ||ohfluckaduck: A very brilliant draw.|
< Earlier Kibitzing · PAGE 3 OF 3 ·