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Jan-30-10
 | | johnlspouge: Saturday (Very Difficult)
Ding Liren vs Ni Hua, 2009 (34.?) White to play and win.
Material: Down B for R. The Black Kh7 has 1 legal move, h7, immediately suggesting the candidate 34.h7+, to steal the flight square. Black threatens 34…Bh5+, winning Be2. Otherwise, the White Kf3 is secured from check. The White Bf6 suggests the later candidate Rf4-h4, for Anderssen’s mate with Rh4-h8#. The theme of Anderssen’s mate effectively pins the Black B on h7 to the mate square h8, a theme throughout the following. Candidates (34.): h7+
34.h7+
(1) 34…Kxh7 35.Rh4+ Bh5+ [Kg8 36.Rh8#]
36.Rxh5+ Kg6 [Kg8 37.Rh8#]
37.Rh6+ Kf5 38.Bd3+ Re4 39.Bxe4#
(2) 34…Bxh7 35.Rh5 Re4 36.Rxe4 Bxe4+ 37.Kxe4
White has only 2B for R+P, but with 2Bs, the passed Pd5 will make short work of Black. |
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Jan-30-10
| | johnlspouge: < <gofer> wrote: Okay, this is officially "mixed up" week. > < <remolino> wrote: I think that CG's software to determine a
puzzle's difficulty needs calibration. >
Amen. The variations were straightforward; the candidate, immediately obvious to me. Today was Wednesday difficulty at most. |
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| Jan-30-10 | | gofer: I forgot to mention that 36 ... Re4 is playable and even looks threatening. But Pe3 doesn't make it because Bf6 can come to c3 to stop the promotion. Hence the reason for me looking at Re6... 36 ... Re4
37 Rxh7 Kxh7
38 Bd3 Rfe8
39 Bxe4 Rxe4
40 Kxe4 e2!
41 Bc3 saving the day... |
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Jan-30-10
 | | agb2002: White has the bishop pair for a rook and a bishop. The bishop on f6 and the rook on f4 suggest 34.h7+ Bxf7 (34... Kxh7 35.Rh4+ Bh5 36.Rxh5+ Kg6 37.Rh6+ Kf5 38.Bd3+ Re4 39.Bxe4#) 35.Rh4: A) 35... Ra8 36.Bd3 Rfb8 (36... Bxd3 37.Rh8#) 37.Rxh7 and 38.Rh8#. B) 35... Be4+ 36.Rxe4 Rxe4 (otherwise 37.Rh4 and Rh8#) 37.Kxe4 and Black can only stop White's d pawn at the cost of the rook. C) 35... Re4 36.Rxh7 Kxh7 37.Kxe4 like line B.
D) 35... Re6 36.Bd3 Rxf6 37.Bxh7+ Kg7 38.gxf6+ Kxf6 39.Kxe3 + - [B vs P]. |
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Jan-30-10
 | | kevin86: The bishop is immovable and white can then attack it a second time via Bd3 and mate will follow at h7 by the same bishop or at h8 if the bishop moves. Very easy puzzle for a Saturday. |
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| Jan-30-10 | | mrsaturdaypants: Thanks, <Once>. |
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| Jan-30-10 | | felixd: I don't understand... Is this really a saturday puzzle? I got it in like 10 seconds... But at least it is a great game with a nice pun :) |
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| Jan-30-10 | | Utopian2020: Got it immediately. The only explanation is that I just got a lot smarter. That's my story and I'm sticking with it until Sunday's puzzle. |
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Jan-30-10
 | | Jimfromprovidence: How about giving back the exchange with 28...Rd8!?...
click for larger view ...assuming 29 Bxd8 Rxd8, below.
click for larger viewNow, if 30 K4 f5 it gets interesting.
click for larger viewBlack has a worse position, but at least the heat on the king is gone. |
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| Jan-30-10 | | Brandon plays: Black has a very passive position that is going to be difficult to defend against. Black's immediate threat is Bh5 winning white's bishop. Black's pawns on the queenside are being controlled by white's bishop and a further push of a4 can further strengthen that blockade. Black's rooks are extremely passive and the king looks vulnerable. The immediate Rh4 does not work as the king can play Kh2 and the attack ends. h7+ Khx7?? Rh4 Kg8 Rh8# does not work for black. So, h7+ Bxh7 Rh4 Rb8(or something) and Bd3! and black is dead. This seems a lot easier than yesterday's puzzle. |
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| Jan-30-10 | | BOSTER: The black castle almost destroyed ,and black king mobility is very limited, rooks on e8 and f8 create the barrier to escape.
White has very strong power on black squares in the black king castle.
Idea to mate on h8 by rook.
First we have to open h file.
34.h7 Bxh7-forced.
35. Rh4 Rd8 Black has to find 4 tempo to escape.
36.Bd3-deflection -to take the bishop on h7 from h8 square and white wins. |
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Jan-30-10
 | | MrMelad: Wednesday? Tuesday at most. |
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| Jan-30-10 | | wals: for those who just have to know the end
34.
h7+ Bxh7 35. Rh4 Re6 36. dxe6 fxe6 37. Rh6 Rf7 38. Kxe3 Kf8 39. Bg4 Bg8 40.
Bxe6 Rh7 41. Be5 Bxe6 42. Rxh7 Bf7 43. a4 a5 44. Kf4 Ke8 45. Rxf7 Kxf7 46. Kf5
Kf8 47. Kf6 Ke8 48. Bd6 Kd7 49. Ke5 Kc6 50. g6 Kd7 51. g7 Kc6 52. g8=Q Kb6 53.
Bb8 Ka6 54. Qe6+ b6 55. Qc8# 1-0
Rybka 3 1cpu: 3071mb hash: |
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| Jan-30-10 | | WhiteRook48: i had rh4 before h7+ dang it |
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Jan-30-10
 | | patzer2: For today's Saturday puzzle solution, the sham pawn sacrifice 34. h7+ sets up a decisive pin with a mate threat. In the final position, Black has no good reply to the threat of 36. Bd3  . |
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Jan-30-10
 | | Marmot PFL: Pretty straightforward once you see the idea of the mating net, which is not so unusual with Bf6 and open h file, pf7 trapping king etc. Easier than one i missed on thu or fri. |
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Jan-30-10
 | | hedgeh0g: I'm going to make a typically constructive remark for this Saturday's puzzle: waaaaaaaaaaay too easy. |
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| Jan-30-10 | | kurtrichards: The first "Very Difficult" puzzle I've ever solved. |
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| Jan-30-10 | | Caissas Clown: "Jan-30-10 gofer: Okay, this is officially "mixed up" week.
So what treat are we going to get tomorrow?".
Gofer - The "INSANE" puzzle will be :-
1.F4 ..E5
2.G4..black to play and win.
Sorry if that's a "spoiler" :-) |
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Jan-30-10
| | patzer2: As the winner of the Chinese Championship in 2009, and with his thorough beating of a Super GM in this game, 17-year-old GM Ding Liren
is an up and coming player worth watching. See http://en.wikipedia.org/wiki/Ding_L... for a bit of back ground information on this Chess protege. Black's most obvious mistake appears to be 20...e4?? Now White could probably have won immediately with 21. g4! hxg4 22. h5 Bh7 23. h6 . However, 21. Bxh5!  turns out to be just as decisive. Earlier, perhaps 18...Qd7 might have been Black's best chance for equality. |
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Jan-30-10
| | patzer2: Now the discovered check exchange sacrifice 27. Bf6+!! as noted by <notyetagm> would make for an insanely difficult puzzle. |
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| Jan-30-10 | | Sydro: Easiest saturday puzzle yet? |
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| Jan-30-10 | | turbo231: This puzzle looks very interesting. |
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| Jan-30-10 | | VincentL: The next puzzle will be up in about one hour, so for this one I am probably the last poster
of the day.
In this "very difficult" position, white is an exchange down. The idea is clearly to bring about mate on h8 (with Rh8). The task is to see how to prevent black's bishop on g6 from impeding this mate. The rooks on the 8th rank cannot get round fast enough to offer defensive support. The key is the move order. After a little thought, I am sure the first move is 34. h7+ Now 34... Bxh7 35. Rh4. The threat is 36.. Bd3 ! After 36.....Bxd3 37. Rh8 mate
If 36..... some other move 37. Bxh7 mate
If 34.... Kxh7 35. Rh4+ Now 35.... Kg8 36. Rh8 mate. 35.....Bh5+ 36. Rxh5+ Kg6 (Kg8 37. Rh8 mate)
37. Rh6+ Kf6 38. Bd3+ Re4 39. Bxe4 mate
This must be the solution. Very simple once you see it. |
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| Apr-02-12 | | Whitehat1963: Clever finish. |
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sac: 27.Bf6+
