Sentence 1: Ally wasn't sure what to get for Tyler's birthday. 
 Sentence 3: Since he liked chess, she made him custom chess pieces 
 Sentence 4:  He was delighted to receive the gift 
 Sentence 5:  Now Ally and Tyler play chess every week with her beautiful pieces 
 Option 1: She decided to make him a gift. 
 Option 2: Ally completely forgot about Tyler's birthday.