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Subject: Re: Chess960 - how many "different" castles?

Author: John Merlino

Date: 11:56:57 01/18/06

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On January 18, 2006 at 04:30:48, Gerd Isenberg wrote:

>On January 17, 2006 at 20:04:19, John Merlino wrote:
>
>>On January 17, 2006 at 14:40:38, Gerd Isenberg wrote:
>>
>>>I guess 21 (1+2+3+4+5+6) per side and wing is correct - but it would be nice if
>>>some Chess960 expert can comfirm this number.
>>>
>>>Enumerating moves...
>>>
>>>Thanks,
>>>Gerd
>>
>>http://www.talkchess.com/forums/1/message.html?480441
>>
>>jm
>
>Thanks John,
>i see there are 56 different KRK positions - but is it therefore correct to say
>there are 56 different ways to castle in FRC if there are only 21-possible
>queen- and 21 possible king castles per side?
>
>wK #0-0-0 #0-0    *
>b1      1    6    6
>c1      2    5   10
>d1      3    4   12
>e1      4    3   12
>f1      5    2   10
>g1      6    1    6
>-------------------
>sum    21   21   56
>
>Gerd

Ok, I misunderstood you. I thought you wanted the number of different
COMBINATIONS of castling possibilities.

So, yes, if what you wanted was the number of different possible castling MOVES,
then it is indeed 42.

jm



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