MatPlus.Net

 Website founded by
Milan Velimirović
in 2006

3:34 CET
 
  Forum*
 
 
 
 

Username:

Password:

Remember me

 
Forgot your
password?
Click here!
SIGN IN
to create your account if you don't already have one.
CHESS
SOLVING

Rating lists
01-Jul-2019

B P C F





 
 
MatPlus.Net Forum Misc Construction task
 
You can only view this page!
Page: [Previous] [Next] 1 2
(1) Posted by Michael McDowell [Tuesday, Sep 8, 2009 16:31]

Construction task


Has the following construction task been shown before?

Can it be beaten?

M.McDowell

Original (?)

(= 8+5 )


1.gxf8Q will mate a black king standing on any one of 31 squares.
 
(Read Only)pid=4070
(2) Posted by Jacques Rotenberg [Wednesday, Sep 9, 2009 09:09]; edited by Jacques Rotenberg [09-09-09]

This is a Kriegspiel 1#. Very nice.
 
 
(Read Only)pid=4073
(3) Posted by Hauke Reddmann [Wednesday, Sep 9, 2009 10:21]

Yes, this is known, but I don't recall *where*, *when*,
and from *who* I saw it, or if the position is identical.
But at least you now know you're anticipated :P

Hauke
 
   
(Read Only)pid=4074
(4) Posted by Joost de Heer [Wednesday, Sep 9, 2009 12:55]; edited by Joost de Heer [09-09-09]

Close, but with 2 mating moves:
Karl Fabel
Fairy chess review 1939
(= 7+6 )

#1 for how many squares of the black king?

 QUOTE 

This is a Kriegspiel 1#. Very nice.

Is gxf8 legal in Kriegspiel? White can't know that there is a piece on f8, can he?
 
   
(Read Only)pid=4078
(5) Posted by Juraj Lörinc [Wednesday, Sep 9, 2009 15:12]

Of course he can know, e.g. if something unknown has just captured something known there. It is even possible to know it is knight, as White has already captured all remaining black force, he could have discovered the type of remaining piece by trying to move his king in the knight's vicinity.
 
   
(Read Only)pid=4079
(6) Posted by Joost de Heer [Wednesday, Sep 9, 2009 15:36]

In a Kriegspiel game he might now, but not in a Kriegspiel problem.
 
   
(Read Only)pid=4080
(7) Posted by Juraj Lörinc [Wednesday, Sep 9, 2009 16:07]

Actually, in a Kriegspiel problem it is much easier. Author just sets the board and gives stipulation. He is free to set up black pieces on the board. There are many Kriegspiel problems featuring pieces of both sides.

http://jurajlorinc.tripod.com/chess/krieg1.htm
http://jurajlorinc.tripod.com/chess/krieg2.htm
 
   
(Read Only)pid=4081
(8) Posted by Jacques Rotenberg [Wednesday, Sep 9, 2009 21:16]; edited by Jacques Rotenberg [09-09-09]

Here, you can bring it to 32 :

(= 9+7 )


To my taste, the Fabel is much less interesting : it is not a Kriegspiel.
 
   
(Read Only)pid=4085
(9) Posted by Geoff Foster [Wednesday, Sep 9, 2009 23:46]

Why not a bishop on h8?
 
   
(Read Only)pid=4087
(10) Posted by Joost de Heer [Thursday, Sep 10, 2009 00:13]

You lose g6 as a mating square.
 
   
(Read Only)pid=4088
(11) Posted by Jacques Rotenberg [Thursday, Sep 10, 2009 07:59]

slightly lighter :

(= 8+6 )

 
   
(Read Only)pid=4089
(12) Posted by Siegfried Hornecker [Thursday, Sep 10, 2009 16:32]

Refutation:
bKa6; 1...b6-b5!
 
   
(Read Only)pid=4090
(13) Posted by Zalmen Kornin [Thursday, Sep 10, 2009 17:24]; edited by Zalmen Kornin [09-09-10]

this is starting to become like the 'Belén Story' :)
 
   
(Read Only)pid=4092
(14) Posted by Jacques Rotenberg [Thursday, Sep 10, 2009 18:04]

@Siegfried : The bK cannot be on a6 !

@Zalmen : what is "Belen story" ?
 
   
(Read Only)pid=4093
(15) Posted by Zalmen Kornin [Thursday, Sep 10, 2009 18:15]

Jacques: The most animated online problem 'workshop' so far - some of the original posts appeared in the disappeared "Rebnora" forum. But most is still online in other places , for instance http://www.chessproblem.net/viewtopic.php?f=7&t=60

On the topic: Bravo, it seemed very hard to improve Michael's position
 
   
(Read Only)pid=4094
(16) Posted by Joost de Heer [Saturday, Sep 26, 2009 16:48]

In fairy chess, this can be improved of course. So far, the maximum I've been able to find is 57:
(= 2+2 )

=UbiUbi
1. gh8=UU and the king is mated on all 57 squares it could've legally been before white's last move (last move was in all cases f7xg6, unless the black king is on f7, then it was Kxf7).

And if the white king doesn't have to be present, this can be improved to 59:
(= 2+1 )

=UbiUbi
1. gh8=UU and the king is mated on all 59 squares it could've legally been before white's last move.
 
   
(Read Only)pid=4154
(17) Posted by Jacques Rotenberg [Sunday, Sep 27, 2009 06:05]

If you go to fairy field with no limitation, it seems that you can do (much) better.
 
   
(Read Only)pid=4158
(18) Posted by Kevin Begley [Sunday, Sep 27, 2009 11:02]; edited by Kevin Begley [09-09-27]

The UbiUbi problem works on an infinite board, no?
Can't do much better than this, and marvelous economy.

I'm not certain this improves, but if you stipulate that black's Royal unit is a King...

white Royal-Pawn g7
black UbiUbi h8

(= 1+1 )

#1 Kriegspiel

Then extend the board infinitely (South and West).
Of course, the position is almost certainly retro-illegal.
 
   
(Read Only)pid=4159
(19) Posted by Siegfried Hornecker [Sunday, Sep 27, 2009 11:47]; edited by Siegfried Hornecker [09-09-27]

And if black's king stands on h7 or g8, white is already checkmated. However, this would certainly be retro-illegal.
 
   
(Read Only)pid=4160
(20) Posted by Jacques Rotenberg [Sunday, Sep 27, 2009 13:25]; edited by Jacques Rotenberg [09-09-27]

a single non-capturing immune and transparent pawn on h7, with promotion in powerful ubi-ubi allowed.
Then 1.h8=Ubi-ubi gives mate with the black K being possibly on 64 cases !

Then, of course, you can extend the chess board .... as suggested ....
 
   
(Read Only)pid=4162

Read more...
Page: [Previous] [Next] 1 2

MatPlus.Net Forum Misc Construction task