Paltrow gives the performance of the year, and perhaps of her career, in this extraordinary and powerful dissection of genius, jealousy, madness and serenity.

An extraordinary thriller... The film centers on two remarkable performances, by Gwyneth Paltrow and Hope Davis.

It's so fluid and cinematic that it's hard to even envision how the piece worked on stage.

Proof is on the side of the lost, blessed souls. Paltrow, as alluring and reassuring as ever, emphasizes the blessedness in the isolation of genius, giving a new dimension to a complex role. New, true and thrilling--she is the Catherine that Proof was waiting for.

The material is intellectual, but the treatment is not. Proof is a stirring motion picture that challenges our views on a great many things about life, some of which we take for granted. And, by opening up the play, Madden has made it less talky and more cinematic without losing the quintessential elements that made it such a success on stage.

Tasteful, thoughtful fare that entertains without ever speaking down to the audience.

But despite less-than-ideal casting of the male roles, and a tendency to soften the Pulitzer Prize-winning work's thorny humor with a more sober tone, director John Madden has woven together an elegant, intelligent drama of a breed increasingly rare in mainstream American movies.

Against considerable odds and despite a shaky start, Proof proves itself in every area.

But at its highest level of ambition, Proof fails to deliver. The film becomes a psychological whodunit where Catherine is shown to be either a martyr to her father or else his intellectual equal. None of it is terribly convincing.

Proof proves undeniably that the intimacy of a stage play can be re-created powerfully on screen.

Hopkins plays "Hopkins," and the buff, terribly miscast Gyllenhaal will be convincing only to viewers who've never set foot on a university campus. What makes it worth seeing, however, is the extraordinary chemistry between the atypically raw and unguarded Paltrow and Davis, a fabulously talented actress once again testing her range with a performance unlike any she's given in the past.

Very, very faithful to Proof the play.

Once you get past that golden swag and curtain of hair, Paltrow's performance is devastating, cutting to the pith and marrow of parent-child relations. The other actors in this stagebound movie fare less well.

Proof is proof that you can drain most of the juice out of a play and still have an enjoyable night at the movies.