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| Apr-24-10 | | David2009: White has an immediate draw by perpetual check, whilst Black is threatening mate in two starting ...Rd3+: so the problem is to find the win.
click for larger view Even setting it up on Crafty http://www.chessvideos.tv/endgame-t...
I couldn't solve it: and yet it is a simple forced mate in 5.
Ref: Saturday's puzzle Chiburdanidze vs P Feustel, 1976 White 43? |
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| Apr-24-10 | | lost in space: Hmmm, seems to be a forced mate in 5 or so.
43. Rg7+ Kf6 (forced) 44. g5+ hxg5
(44...Kf5 45. Re5#)
45. Rgf7+ Kg6 (forced) 46. f5+ (the only small hurdle; not 46. fxg5) 46...Kh5 or 46...Kh6 47. Rh7#
Is it Wednesday or Saturday? |
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| Apr-24-10 | | lost in space: <<chessgames.com:> We have so many new users among us today for the WCC we thought we'd be generous on this very important Saturday. See you all at 10:00 USA/Eastern for the big game!> It IS Saturday, but a special one. ;-) |
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| Apr-24-10 | | SamAtoms1980: This is NOT a "Monday". Wednesday or Thursday would be more like it. I did not see either 45 Rgf7+ or 46 f5+ without the help of the brown arrows (as seen by using ChessBase). |
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| Apr-24-10 | | gofer: Whatever white does it has to be very forcing. Black is about to play 43 ... Rd3+ 44 Kh4 Rh2#. The trick to this one is to use black h6 pawn against him! Offer two alternatives, take me and block in your king and don't take me a get taken instead! 43 Rg7+ Kf6
44 g5+! ...
44 ... hxg5 45 Rgf7+ Kg6 46 f5+ Kh6/Kh5 47 Rh7#
44 ... Kf5 45 Rgf7+ Kg6 46 Rf6+ Kh5 47 Rxh6#
So a forced mate in 4 moves... ...perhaps this isn't "Very Difficult"!? Or maybe I just got lucky! Time to check... |
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| Apr-24-10 | | gofer: My solution was okay. My rudimentary maths still needs a little work! :-) |
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Apr-24-10
 | | patzer2: For today's Saturday puzzle solution, 43. Rg7+! forces mate-in-five in this double Rook endgame. Instead of 42...Rc7?, allowing the quick mate, 42...Rd1 or 42...Rd2  would have put up more resistance with some practical drawing chances. |
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Apr-24-10
 | | agb2002: The material is even.
Black threatens mate in three with 43... Rd3+ 44.Re3 Rxe3+ 45.Kh4 Rh2#. The black king is surrounded by five enemies, enough to force mate with 43.Rg7+ Kf6 44.g5+ (to block the square g5) hxg5 (44... Kf5 45.Re5#) 45.Rgf7+ Kg6 46.f5+ Kh5(6) 47.Rh7#. |
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| Apr-24-10 | | RobertLangdon: Can <OBIT's> rook ending be won? |
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| Apr-24-10 | | johnlspouge: < <dzechiel> wrote: Most kibitzers here are capable of finding this if they don't give up too easily. > Indeed. My analysis today was pure process of elimination. |
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| Apr-24-10 | | johnlspouge: Saturday (Very Difficult)
Chiburdanidze vs P Feustel, 1976 (43.?) White to play and win.
Material: Even. The Black Kg6 is stalemated. Black has a mate threat: 43…Rd3+ 44.Kh4 Rh2#
Thus in the following, any candidate must be a check or have defensive qualities, pruning the decision tree enormously. The Black Rc2 is loose and can be skewered, if the Black K runs to the c-file. Candidates (43.): f5+, Rg7+
[43.f5+ Kg5 44.Rg7+ Kf6 45.Ref7+ Ke5 46.Rfe7+ Kf6 repeats.] 43.Rg7+ Kf6
Candidates (44.): Ref7+, g5+
[44.Ref7+ can only transpose to the variation above.] 44.g5+ hxg5 [Kf5 45.Ref7+ Ke6 46.Rf6#]
Candidates (45.): fxg5+, Rgf7+
[45.fxg5+ Kf5 46.Ref7+ Ke5 makes no progress]
45.Rgf7+ Kg6 46.f5+ Kh6 [or Kh5] 47.Rh7# |
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| Apr-24-10 | | Patriot: It sounds like most kibitzers found this easily. It took me way too long, but figured it out after going thru each possibility. Black has a mate threat: 43...Rd3+ 44.Kh4 Rh2#. So white must play forcibily with a check, create flight squares for the king, or force a draw by creating a mate threat of his own. 43.Kh4 is shooting for a draw after 43...Rh2+ 44.Kg3 Rc2. But this is no way to finish a game without even looking to see if there's a win. I spent a lot of time on 43.f5+ and could only find a perpetual. I also considered 43.g5 and saw that this lost to 43...Rd3+ 44.Kh4 Rh2+ (44.Kg4 h5+ 45.Kh4 Rh2#) 45.Kg4 h5#. So I switched over to 43.Rg7+ Kf6 and toyed with 44.Ref7+ Ke6 45.f5+ seeing another draw. Then I backed up and saw 43.Rg7+ Kf6 44.g5+ hxg5 (44.Kf5 Re5#) 45.Rgf7+ Kg6 46.f5+ Kh6/Kh5 47.Rh7#. I was happy that I solved it, but not happy with my approach and that it took too long. This is why it's good to not get too deeply involved in certain variations without considering other candidates first along the way. In that sense I failed. |
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| Apr-24-10 | | Eduardo Leon: White to play. 43.?
click for larger viewMaterial is equal. Both sides have very active rooks with direct threats against their respective enemy king. Black's obvious threats are more immediate (43...♖d3+ 44.♔h4 ♖h2#) than white's. But it's white's turn. <43.♖g7+ ♔f6 44.g5+> 
click for larger viewRobbing the black king of one potential escape square. <43...hxg5>
Not 43...♔f5 44.♖e5#.
<44.♖gf7+ ♔g6 45.f5+> 
click for larger viewThe objective has been achieved: The black king is cornered in the h file. <45...♔h(any) 46.♖h7#> |
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| Apr-24-10 | | Eduardo Leon: <johnlspouge: Thus in the following, any candidate must be a check or have defensive qualities, <pruning the decision tree enormously.>> Nice approach to solving the puzzle. I guess it saved you a lot of time compared to other kibitzers, including me. |
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| Apr-24-10 | | Eduardo Leon: <Criswell>, the answer to a chess puzzle <includes> all possible continuation. The first move is... duh... just a move. |
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Apr-24-10
 | | playground player: Here we have another example of how to use the opponent's own pawn against him. Black's h-pawn must take White's g-pawn...and then it becomes an obstacle blocking Black's escape from checkmate. |
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| Apr-24-10 | | Eduardo Leon: 19...h6 was a serious mistake that allowed 20.♘e6!. Instead, 19...♖ae8 should have kept the balance. |
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| Apr-24-10 | | WhiteRook48: failed to spot it, went for f5+ and Rg7+ instead |
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| Apr-24-10 | | jmay: got it. and i'm a patzer, so it must not be that hard |
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| Apr-24-10 | | VincentL: In this "very difficult" position, both sides have mating threats. In fact black can mate straight away with Rd3+ followed up by Rh2 mate. White can start with f5+ or Rg7+. Of these I prefer f5+ We than have 47. f5+ Kg5 48. Rg7+ Kf6 49. Ref7+ Ke5 and white is not making progress. Of course white can get a perpetual by playing 49. Rgf7+ in this line. But we are surely looking for a win. The only other possible continuation I see in this line is 49. g5+. Now if 49...hxg5 50. Rgf7 is mate. The alternative is 49....Kxf5. Here I cannot see a winning continuation.
I keep wanting to play gxh6, but I cannot get it to work. So....is the first move in fact Rg7+?
We then have 47. Rg7+ Kf6 Now there are two possibilities, g5+ or Ref7+ followed by f5 +
After 48. g5+, if 48....hxg5+ 49. fxg5+ Kf5 50. Ref7+ Ke6 51. f6 and I think white may be able to queen the pawn. If 48....Kf5 49. Ref7+ (to deflect black's king and so remove
the mating threat) Ke6 50. gxh6 and this pawn will queen. This looks to be the solution, but I am not entirely convinced. Even if it wins, there may be something easier. I am going to check. |
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| Apr-24-10 | | VincentL: No! I am embarrassingly blind to a simple mate. |
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| Apr-24-10 | | wals: I went for Rf8 which was a blunder and
-#3. Ya cant help laughing. Really pathetic.
Rybka 3 1-cpu: 3071mb hash: depth 22:
Up to move 41 White's lead was +1.94,
then disaster,
42.f4 blunder + 0.83 (better was Rxb7 +1.94).
Black must have thought " you are not going to hand me the game that easy"
so -
42...Rc2 +#5 and so it ended. Better was Rd1 +0.83. |
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| Apr-24-10 | | tacticalmonster: I did not get this puzzle. I stubbornly try to make 45 Ref7+ worked. I totally forget about 45 Rgf7+. |
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| Apr-25-10 | | TheaN: 5/6
Grrrr. How was I looking at this for well over 15 minutes with the right ideas (pretty identical to <OBIT's>) but no good combination? Weird. |
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| Jan-20-16 | | whiteshark: The last move should indicate mate (#)
click for larger view |
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