  We derive a pair potential from tight binding further neighbours attraction
that leads to superconducting gap symmetry similar to that of the
phenomenological spin fluctuation theory of high temperature superconductors
(Monthoux, Balatsky, Pines, Phys. Rev. Lett. {\bf 67}, 3448). We show that
higher anisotropic d-wave than the simpliest d-wave symmetry is one of the
important ingredients responsible for higher BCS characteristic ratio.
