  We consider a new approach to the nucleon-nucleon scattering problem in the
framework of the higher-derivative formulation of baryon chiral perturbation
theory. Starting with a Lorentz-invariant form of the effective Lagrangian we
work out a new symmetry-preserving framework where the leading-order amplitude
is calculated by solving renormalizable equations and corrections are taken
into account perturbatively. Analogously to the KSW approach, the (leading)
renormalization scale dependence to any finite order is absorbed in the
redefinition of a finite number of parameters of the effective potential at
given order. On the other hand, analogously to Weinberg's power counting, the
one-pion-exchange potential is of leading order and is treated
non-perturbatively.
