sentences:  His method was to consider normal surfaces "Z" with a birational proper map to "Y" and show that there is a minimal one with minimal possible arithmetic genus.He then shows that all singularities of this minimal "Z" are pseudo rational, and shows that pseudo rational singularities can be resolved by repeatedly blowing up points.The problem of resolution of singularities in higher dimensions is notorious for many incorrect published proofs and announcements of proofs that never appeared.