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Posted by bunta
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12/29/2006
21:39:56

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Subject: help mate puzzle

Message:
-> www.chessbase.com

I havent read it, its chessbases's christmas present =D


Posted by ionadowman
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12/30/2006
13:12:06

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Here's the puzzle:

Message:
Black to play; helpmate in 2 (White delivering mate).

b


If it's White to play, the thing's pretty quick:
1.Re4 Rg7 2.Rh4#
Interestingly, if the WN were absent from the board, the position would still be checkmate. A clue here, maybe?
My usual approach to this kind of thing is to look for a mating configuration, but I'm finding it difficult (except for the pseudo-solution shown) to discover one... The problem is that it's hard to arrange for the g6-rook to be unpinned whilst retaining the bishop's presence on that diagonal. I think I'll go away and think about it for a while... Trust John Nunn to come up with something challenging...
Cheers,
Ion



Posted by ionadowman
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12/31/2006
00:13:29

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Help in 3 is easy:

Message:
...but there are several ways of achieving it. The tastiest is:
1...Bh4+ 2.Nxg6 Bf6 3.Rc6 Bg7 4.Nf8#

Stick a pawn at h6 and the 2-mover is simple:
1...Bxe5 2.Rg4 Bg7 3.Bxg6#

Still no cigar, though... :-/

———
Shirov Wins Shanghai Masters — Alexei Shirov of Spain has won the Shanghai Masters chess tournament, with a round to spare. Tuesday, he beat Wang Hao of China, clinching first place. It was Shirov’s third consecutive win. Under the scoring system used in Shanghai (3 points for a win, 1 point for a draw), Shirov has 11 points (three wins and two draws). Levon Aronian of Armenia and Vladimir Kramnik of Russia are tied for second with 6 points each (one win, one loss and three draws), while Wang has 2 points (three losses and two draws). The top two scorers advance to the Bilbao Final Masters next month in Spain, which means that the final-round games on Wednesday will be pivotal. Aronian will be Black against ...
Posted by sf115
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1/01/2007
11:19:37

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Answer

Message:
1... Bh4 2. Bd1 Rg7 3. Rxh4++ is the answer to the helpmate in 2
———
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Posted by sf115
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1/01/2007
11:21:48

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Message:
ionadowman said, "If it's White to play, the thing's pretty quick:
1.Re4 Rg7 2.Rh4#" that's illegal as the rook on g7 is pinned by the bisiop.

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Posted by vanleeuwenhoek
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1/01/2007
17:47:53

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Message:
No, that was the point of the Re4 move, to block the bishop's diagonal and unpin the rook.
———
Aronian Leads Shanghai Masters — In 2008, the Grand Slam Chess Final Masters was created to bring together the winners of the top chess tournaments of the year. Last year, the final was reduced to four competitors from six because of the economic downturn, but it still included the winners of the year’s elite chess events. This year the formula was changed. While the grand slam still includes top chess players, their selection is more arbitrary. And there are two events: A final that will be, as in the first two years, in Bilbao, Spain (and to which Viswanathan Anand of India, the world chess champion, and Magnus Carlsen of Norway, the world’s top-ranked chess player, are already invited), and a preliminary tournament in Shanghai, China, to ...
Posted by chrisp
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1/02/2007
05:01:40

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Not the answer, sf115

Message:
After 1.....Bh4,

white cannot play Bd1 as he is in check, so that solution isn't correct!!

———
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Posted by juve_leo
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1/02/2007
08:07:22

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Message:
...but there are several ways of achieving it. The tastiest is:
1...Bh4+ 2.Nxg6 Bf6 3.Rc6 Bg7 4.Nf8#
your numbers are wrong Nxg6 should be Nxf6

1...Bh4+ 2.Nxf6 Bf6 3.Rc6 Bg7 4.Nf8#


Posted by ionadowman
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1/02/2007
10:58:08

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No...

Message:
2.Nxg6 is correct. But in general, we agree the line ends in a 3-move helpmate.
vanleeuwenhoek is correct: 1.Re4 blocks the bishop's action and hence releases the pin on the rook, allowing it to retire (1...Rg7). But this obviously isn't the solution: the White knight doesn't have a role.
It is very easy to get things wrong in this kind of thing. I had another "3-mover" I was about to post, but I saw, just in time, it wasn't a mate.
Something to point out, too, in puzzles of this nature. Every element is there for a reason, and every move is essential. Suppose 2.Bd1 in sf115 his solution were legal. Would it have been the only move that led to mate? No. 2.Bb3 would have done just as well. Not a solution then.
The solution begins with a "key move" by Black. So far, I still haven't found it. Anything other than a Bishop move seems to free up Black's King, but a bishop move is a check, which limits White's response. I almost wish the position were incorrect and that there was supposed to be a Black pawn on h6!
Cheers,
Ion


Posted by ionadowman
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1/02/2007
20:19:21

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It might help...

Message:
... to try out this "quintet" puzzle - got from the same site...

Black to play, helpmate in 2:

b

The difficulty here is that although R+N can mate unaided in the corner, such a setup would take more than 2 moves here. So the Black Q has to cooperate.

It gets better, though. having solved it, replace the queen with a black rook, and solve. Then solve for a bishop, then a knight, then a pawn. For the last, remember thet the pawn is 5 squares away from queening, not two!
I found these 5 a lot easier than than the one given to begin this thread (though the bishop one is a bit tricky). But its ideas may be a help in solving the latter.
Cheers,
Ion



Posted by vanleeuwenhoek
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1/03/2007
15:40:35

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Aha!

Message:
The solution! So don't scroll down if you don't want to see it..













1...Qa8 2. Bb3 Rh6 3. Rc7#


Posted by honololou
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1/03/2007
16:45:08

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Well done…

Message:
vanleeuwenhoek. Now I can get a good night's sleep tonight.

Posted by ionadowman
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1/04/2007
11:11:22

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Very neat...

Message:
... I hardly looked at 1...Qe8 at all (though I did wonder - very briefly - if there might be something in ...Qa8 and ...Rb8!). I did look at Bb3 and Rc7 as possibilities within the sequence but not in conjunction with Black's Qa8. Thanks, vanleeuwenhoek. The beauty of this solution is that every piece participates in the final mate.
;-)
Ion