Nihal was the National Under-9 Champion, 2013 in Chennai, the National Under-11 Bronze medalist in 2014 at Puri, and the National Under-11 Silver medalist, 2015 in Pondicherry.
Nihal's first big break came at the World Youth Chess Championship in the Under-10 category, which was held in Durban, South Africa in September 2014. He scored 9/11 to be crowned the Under-10 World Champion. For this achievement, he was conferred the Candidate Master (CM) title by FIDE.
In 2014, Nihal began to work with Ukrainian Dimitri Komarov, an experienced coach with international success in his playing days. Right after his World Youth success in 2014, Nihal scored his first victory over a titled player—IM Jonathan Westerberg of Sweden—at the World Junior Championship 2014 in Pune, India. For a year, Nihal was a regular in all the tournaments of importance held in India including the National Challengers Championship in Nagpur. He would regularly hold titled players to draws.