In 2014, at the age of 11, Sophie tried to learn how to play chess after watching her friends play the game at school. She really enjoyed it, so she decided to play in her first tournament soon afterwards. Since then, her rating skyrocketed to above 1500 in July 2015, and then, in February 2016, she broke the 2000 barrier. Later that year, she won second place in the U14 section of the 2016 All-Girls National Championship. The following year, she won the 2017 New York Girls State Championship and the 2017 All-Girls National Championship (in the U18 section). She also carried the Stuyvesant High School chess team to first place victories in the 2016 K-12 Grade Championships and the 2017 All-Girls National Championship. Morris-Suzuki is a returning competitor from the 2018 U.S. Girls' Junior Championship.