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The problem



 
 
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  #1  
Old January 3rd 04, 01:53 AM
Alex Brunetti
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Default The problem

Board position: http://e4e6.com/?36

or FEN string: b1b1bR1B/1b1b1P1k/b1b1N2p/1Q1R1KpP/8/8/4P1P1/8 w

White to move and mate in 1.

Alex



  #2  
Old January 3rd 04, 02:36 AM
King Leopold
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Default The problem

Thanks, but thats an easy one. Black's only legal move was to play g7-g5
thus White would mate by playing hxg6 e.p. Mate
Leopold


"Alex Brunetti" wrote in message
...
Board position: http://e4e6.com/?36

or FEN string: b1b1bR1B/1b1b1P1k/b1b1N2p/1Q1R1KpP/8/8/4P1P1/8 w

White to move and mate in 1.

Alex





  #3  
Old January 3rd 04, 02:38 AM
Alex Brunetti
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Default The problem

"King Leopold" ha scritto nel messaggio
...

Thanks, but thats an easy one. Black's only legal move was to play g7-g5
thus White would mate by playing hxg6 e.p. Mate


If you say so, you should demonstrate that Black din't play h7 x
something-at-g6 or f6 x something-at-g5.
So, the easiness is not so easy

Alex


  #4  
Old January 3rd 04, 02:52 AM
CeeBee
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Default The problem

"Alex Brunetti" wrote in rec.games.chess.analysis:

If you say so, you should demonstrate that Black din't play h7 x
something-at-g6 or f6 x something-at-g5.
So, the easiness is not so easy



I don't want to be a spoilsport, but from neither the board nor the FEN
you can deduct an en passant possibility.

If the position is:

b1b1bR1B/1b1b1P1k/b1b1N2p/1Q1R1KpP/8/8/4P1P1/8 w - g6 0 1

Then it's mate in one.

With the board on the site and the FEN you posted it's mate in three after
1. Bg7 Bxe6+ 2.Kf6 some bishop capture and 3. Rh8#

--
CeeBee


"I am not a crook"

  #5  
Old January 3rd 04, 02:56 AM
Alex Brunetti
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Default The problem

"CeeBee" ha scritto nel messaggio
. 6.82...

I don't want to be a spoilsport, but from neither the board nor the FEN
you can deduct an en passant possibility.


Of course, in a problem's FEN the en passant part is not indicated, usually,
in this kind of problems, i.e. when the en passant option is all-important
to solve the problem.

If the position is:

b1b1bR1B/1b1b1P1k/b1b1N2p/1Q1R1KpP/8/8/4P1P1/8 w - g6 0 1

Then it's mate in one.


Well, so you only have to prove that Black's last move was g7-g5.

Alex


  #6  
Old January 3rd 04, 03:01 AM
CeeBee
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Default The problem

"Alex Brunetti" wrote in rec.games.chess.analysis:


Of course, in a problem's FEN the en passant part is not indicated,
usually, in this kind of problems, i.e. when the en passant option is
all-important to solve the problem.



In that case the solution is a guess...



Well, so you only have to prove that Black's last move was g7-g5.


In "mate in x" problems you normally only have to prove the mating
sequence )


--
CeeBee


"I am not a crook"

  #7  
Old January 3rd 04, 03:52 AM
King Leopold
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Default The problem

Well Alex did indicate a mate in one and I do not see any other possibility
for a mate in one except for the en passant capture. Do you? If not and this
proves to be the solution than I proved that Black's last move was indeed
g7-g5. :-)
Though the above makes me sound like a smart ass, I'm really not trying to
be.
Leopold


"CeeBee" wrote in message
. 6.82...
"Alex Brunetti" wrote in rec.games.chess.analysis:


Of course, in a problem's FEN the en passant part is not indicated,
usually, in this kind of problems, i.e. when the en passant option is
all-important to solve the problem.



In that case the solution is a guess...



Well, so you only have to prove that Black's last move was g7-g5.


In "mate in x" problems you normally only have to prove the mating
sequence )


--
CeeBee


"I am not a crook"



  #8  
Old January 3rd 04, 11:17 AM
Joost de Heer
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Default The problem

In artikel schreef Alex Brunetti:
Board position: http://e4e6.com/?36

or FEN string: b1b1bR1B/1b1b1P1k/b1b1N2p/1Q1R1KpP/8/8/4P1P1/8 w

White to move and mate in 1.


Black has only two possible last moves: g7-g5 and f6xg5.

6 black pawns promoted on a white square. Suppose the f- and h-pawn didn't
promote. Then the other pawns needed 6 captures (a-pawn one, c-pawn one, e-pawn
one and g-pawn three) to reach white promotion squares. But then there is no
capture left to get the f-pawn on the g-file. So the g- and h-pawn didn't
promote. This results in 5 captures: a-pawn one, c-pawn one, e-pawn one and
f-pawn two. So the g-pawn didn't make a capture. So the last move couldn't have
been f6xg5.

So the last move was g7-g5, and white may mate in 1 with hg6ep#.

Joost
--
Du hast mein Herz zerrissen, meine Seele geraubt
Das es so enden würde hätt` ich nie geglaubt [Aus der Ruinen -]
Ohne Rücksicht auf Verluste, hast Du meine Welt zerstört [L'Âme Immortelle]
Eine Welt, die vor kurzem nur uns beiden hat gehört
  #9  
Old January 3rd 04, 12:55 PM
Alex Brunetti
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Default The problem

"Joost de Heer" ha scritto nel messaggio
...

Black has only two possible last moves: g7-g5 and f6xg5.


And g7xh6, but that doesn't break your solution.

6 black pawns promoted on a white square. Suppose the f- and h-pawn didn't
promote. Then the other pawns needed 6 captures (a-pawn one, c-pawn one,

e-pawn
one and g-pawn three) to reach white promotion squares. But then there is

no
capture left to get the f-pawn on the g-file.


Mo there weren't 6 captures available, check the White light-squared
Bishop

So the g- and h-pawn didn't
promote. This results in 5 captures: a-pawn one, c-pawn one, e-pawn one

and
f-pawn two. So the g-pawn didn't make a capture. So the last move couldn't

have
been f6xg5.

So the last move was g7-g5, and white may mate in 1 with hg6ep#.


Substantially correct

Alex


  #10  
Old January 4th 04, 12:54 AM
King Leopold
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Default The problem

Naa naa naa naa naa :-P
Leopold

hee hee hee


"Alex Brunetti" wrote in message
...
"Joost de Heer" ha scritto nel messaggio
...

Black has only two possible last moves: g7-g5 and f6xg5.


And g7xh6, but that doesn't break your solution.

6 black pawns promoted on a white square. Suppose the f- and h-pawn

didn't
promote. Then the other pawns needed 6 captures (a-pawn one, c-pawn one,

e-pawn
one and g-pawn three) to reach white promotion squares. But then there

is
no
capture left to get the f-pawn on the g-file.


Mo there weren't 6 captures available, check the White light-squared
Bishop

So the g- and h-pawn didn't
promote. This results in 5 captures: a-pawn one, c-pawn one, e-pawn one

and
f-pawn two. So the g-pawn didn't make a capture. So the last move

couldn't
have
been f6xg5.

So the last move was g7-g5, and white may mate in 1 with hg6ep#.


Substantially correct

Alex




 




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