Magnon exchange between holes in a doped antiferromagnet provides a
potential mechanism for the preformation of the Cooper pairs of
high-temperature superconductivity. A systematic low-energy effective
field theory for holes located inside pockets centered at lattice momenta
(pi/2a,+/- pi/2a) is constructed and the corresponding one-magnon exchange
potentials between pairs of holes are derived. The resulting two-hole
Schroedinger equations leading to d-wave pairing are studied in detail.
The existence of spiral phases is also investigated.