Definition: In this task, you will be given a short story. One sentence from the story is chosen. Consider the events that happen before that sentence, or are likely to have happened before it. Does any of them directly cause it, or simply make it possible? You should write your answer in the form " A >causes/enables> B". Try to use phrases and sentences from the story to compose your answer when possible.
Input: story: Stew really wanted to learn how to play chess. He checked a few books out of the library about how to play. Then he went to the store to buy a chess set. After a few days he had a good grasp on the basics of the game. Now he's president of his high school's chess club.
 selected sentence: After a few days he had a good grasp on the basics of the game.

Stew checks out books about chess >Causes/Enables> Stew has a grasp on chess