  We show how a theorem about solvability in $C^{1,1}$ of special Isaacs
equations can be used to obtain existence and uniqueness of viscosity solutions
of general uniformly nondegenerate Isaacs equations. We apply it also to
establish the $C^{1+\chi}$ regularity of viscosity solutions and show that
finite-difference approximations have an algebraic rate of convergence. The
main coefficients of the Isaacs equations are supposed to be in $C^{\gamma}$
with $\gamma$ slightly less than $1/2$.
