We consider a two-type contact process on Z in which both types have equal
finite range and supercritical infection rate. We show that a given type
becomes extinct with probability 1 if and only if, in the initial
configuration, it is confined to a finite interval [−L,L] and the other type
occupies infinitely many sites both in (−∞,L) and (L,∞). We
also show that, starting from the configuration in which all sites in
(−∞,0] are occupied by type 1 particles and all sites in (0,∞)
are occupied by type 2 particles, the process ρt defined by the size of
the interface area between the two types at time t is tight