[Retros] Die Schwalbe 222 nr 13237

[Otto Janko]

My interpretation:
 
A set of marked squares is not compliant if there is at least one setup of
pieces on these squares which forms an illegal position. What is the largest
compliant set of squares?
 
Thus, for example, two adjacent squares are not allowed in any compliant set
of squares because you can put the two kings on it yielding an illegal
position.
 
~ÔttÔ~
 



  _____  

From: retros-bounces at janko.at [mailto:retros-bounces at janko.at] On Behalf Of
peter.fayers at virgin.net
Sent: Sunday, January 21, 2007 1:05 PM
To: retros at janko.at
Subject: [Retros] Die Schwalbe 222 nr 13237



What have I missed here? why is e1 g3 h1 legal - put wP on e1!

Rgds,

Peter.

 

13237 - Gerald Irsigler

How many squares can you mark at most on a chess board so that every 
possible position with pieces on those squares (including wK and bK) is 
legal?

(e.g.: mark e1 g2 h1 isn't valid, since wKe1, wBh1 wKg2 isn't legal. e1 
g3 h1
is valid though)



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