A Location Game On Disjoint Circles



determined by m and some point in C. A point placed in a key position
will be called a
key point and an interval formed by two key points will be
called a
key interval.

Before presenting our results in the next section, we report the main
result from Ahn et al. [2004] for the case
K = 1. Consider the following
strategy,
S* used by player G (where key positions are simply N equidistant
points on the circle:

Strategy S*

if there is an empty key position left then

(a) |_ place a point on s key position

else if if r < Z then

(b) |_ place a point in the middle of a maximal interval of the opponent
else

(c) if there is more than one interval of the opponent then
place a point in the middle of a maximal interval of the
opponent

else if there is exactly one interval of the opponent and its length
is l
then

place a point in a bichromatic key interval at distance less

_ than 1/N — l from endpoint of the opponent

Theorem 1 (Ahn et al. [2004]) Let hN, {Cj}jK=1i define a game on a sin-
gle circle such that K
= 1. Then S* is a winning strategy for G although R
can always bring the difference S
G — SR as close as possible to zero.



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