Sing. Plural 1st person If I had loved If we had loved 2nd person If you had loved If you had loved 3rd person If he had loved If they had loved ... Read more of PAST PERFECT TENSE at Speaking Writing.comInformational Site Network Informational
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BISHOPS IN CONVOCATION.





(Chessboard Problems)
[Illustration:
+---+---+---+---+---+---+---+---+
| B | B | B | B | B | B | B | B |
+---+---+---+---+---+---+---+---+
| | | | | | | | |
+---+---+---+---+---+---+---+---+
| | | | | | | | |
+---+---+---+---+---+---+---+---+
| | | | | | | | |
+---+---+---+---+---+---+---+---+
| | | | | | | | |
+---+---+---+---+---+---+---+---+
| | | | | | | | |
+---+---+---+---+---+---+---+---+
| | | | | | | | |
+---+---+---+---+---+---+---+---+
| | B | B | B | B | B | B | |
+---+---+---+---+---+---+---+---+
]
The greatest number of bishops that can be placed at the same time on
the chessboard, without any bishop attacking another, is fourteen. I
show, in diagram, the simplest way of doing this. In fact, on a square
chequered board of any number of squares the greatest number of bishops
that can be placed without attack is always two less than twice the
number of squares on the side. It is an interesting puzzle to discover
in just how many different ways the fourteen bishops may be so placed
without mutual attack. I shall give an exceedingly simple rule for
determining the number of ways for a square chequered board of any
number of squares.


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