It has been argued that "Blade Runner" thematically enfolds moral philosophy and philosophy of mind implications of the increasing human mastery of genetic engineering, within the context of classical Greek drama and its notions of hubris—and linguistically, drawing on the poetry of William Blake and the Bible. This is a theme subtly reiterated by the chess game between J. F. Sebastian and Tyrell based on the famous Immortal Game of 1851 symbolizing the struggle against mortality imposed by God. The "Blade Runner" FAQ offers further interpretation of the chess game, saying that it "represents the struggle of the replicants against the humans: the humans consider the replicants pawns, to be removed one by one. The individual replicants (pawns) are attempting to become immortal (a queen). At another level, the game between Tyrell and Sebastian represents Batty stalking Tyrell. Tyrell makes a fatal mistake in the chess game, and another fatal mistake trying to reason with Batty."