The B-T phase diagram of alpha-(ET)(2)KHg(SCN)(4) has been studied under qu
asi-hydrostatic pressure by means of resistance measurements. Our proposed
B-T phase diagrams at different pressures are qualitatively very similar to
the theoretically predicted diagrams of an imperfectly nested charge-densi
ty-wave system. Furthermore, we observed indications of the existence of th
eoretically proposed field-induced charge-density-wave transitions. The phe
nomenon of phase inversion in the quantum oscillations and its relation to
the phase diagram is also discussed.