Michael Howe wrote on Sun, Dec 18, 2005 04:39 PM EST:
'In Case 2, 4 BCQ pieces must be placed on 4 squares (c1, d1, e1, d2),
giving only 1 combination of filled squares. The same applies to Case 3.
Removing this factor of 4 reduces Case 2 to 72 combinations and Case 3 to
144, making the total number 864, which matches the figure I found by
counting in a somewhat different way.'
Yes, you are of course correct. Thank you, and I will update the webpage
soon.