<Tr> <Th> Snape / James Relationship </Th> <Td> Albus Dumbledore explains to Harry why Snape shows such dislike towards Harry . The two went to Hogwarts together and were great enemies . However, when James' best friend Sirius Black attempted to lure Snape into a room where Remus Lupin, transformed completely into a deadly werewolf, James realized this would put Snape's life in danger, and he stopped him from entering the room . Snape hated James from that day forward, because he realized he would have to repay his debt by helping Harry . Though these details are not explained in particular in this book, they can be pieced together from all of the stories to form the preceding tale . </Td> <Td> Harry does not find out why Snape was so mean to him all year, or that his father even knew Snape . </Td> </Tr> <Tr> <Th> Tasks Leading to Climax </Th> <Td> Each major faculty member--Professors Sprout, Flitwick, McGonagall, Quirrell, and Snape--has offered a protection to the Philosopher's Stone in regard to their subject . Sprout's challenge is Devil's Snare . Flitwick enlarged hundreds of keys and charmed them so that they would fly around the room; only one fit the door to the next room and to capture it one would have to fly on a broom . McGonagall made a life - size Wizard's Chess game . Quirrell offers a troll to guard the next room . Snape made a logic puzzle / riddle that encorporates seven potions, three of which are poision, two of which are nettle wine, one of which returns the drinker to the previous room, and the last of which advances the drinker to the next and final room . </Td> <Td> Only the first three tasks are shown--Quirrell's and Snape's are not . </Td> </Tr> <Tr> <Th> Wizard's Chess </Th> <Td> Chess pieces confer with their player and recommend moves . If they capture a piece of the other color, they drag it off the board . </Td> <Td> Chess pieces are mute but are quite savage when they capture a piece of the other color; they destroy the piece with a sword that is part of the outfit of the piece . When the king is checkmated, his sword falls forward as a symbol of defeat . </Td> </Tr>

Differences between book and movie harry potter sorcerer's stone