  The paper is devoted to a detailed study of the effects of quantum
corrections on the chaotic behavior in the dynamics of a (massless) probe
particle near the horizon of a generalized Schwarzschild black hole. Two
possible origins inducing the modification of black hole metric are considered
separately; the noncommutative geometry inspired metric (suggested by Nicolini,
Smailagic and Spallucci) and the metric with quantum field theoretic
corrections (derived by Donoghue). Our results clearly show that in both cases,
the metric extensions favour chaotic behavior, namely chaos is attained for
relatively lower particle energy. This is demonstrated numerically by
exhibiting the breaking of the KAM tori in Poincar\'e sections of particle
trajectories and also via explicit computation of the (positive) Lyapunov
exponents of the trajectories.
