illustration and have three
marked A, three marked B, and three marked C.
At the intersection of lines there are nine
stopping-places, and a tenth stopping-place
is attached to the outer circle like the tail of a Q.
Place the three counters or engines marked A, the three marked B, and
the three marked C at the places indicated.
Move the engines, one at a time, along the lines, from
to stopping-place, until you succeed in getting an A, a B, and a C on
each circle, and also A, B, and C on each straight line.
You are required to do this in as few moves as possible.
How many moves do you need?