We introduce a new NCP-function in order to reformulate the nonlinear compl
ementarity problem as a nonsmooth system of equations. This new NCP-functio
n turns out to have stronger theoretical properties than the widely used Fi
scher-Burmeister function and other NCP-functions suggested previously. Mor
eover, numerical experience indicates that a semismooth Newton method based
on this new NCP-function performs considerably better than the correspondi
ng method based on the Fischer-Burmeister function.