[2] Sukandar was joint winner, with Vietnamese player Pham Bich Ngoc, of the under-16 girls' section of the 6th ASEAN Age Group Chess Championships in Pattaya, Thailand in June 2005.

[4] In March 2008, Sukandar won the women's event of the 10th Rector Cup in Kharkiv, Ukraine edging out on tiebreak Ukrainian player Galina Breslavska.

[9] In December 2013 she won two individual gold medals, for rapid and blitz chess, at the 2013 SEA Games held in Naypyidaw, Myanmar.

She won the G section (a ten-player round-robin tournament for female students) of the 2015 Moscow Open with a score of 7.5/9, two points ahead of the runner-up, Alina Kashlinskaya.

In 2016, she shared first place in the Master section of the Continental Class Championships in Herndon, Virginia with Julio Sadorra, Sergey Erenburg and Priyadharshan Kannappan,[13] and won the North Carolina Open with a score of 5/5 points.

[18] Subur's account was later closed for alleged cheating, which drew sympathy from Indonesian netizens and resulted in Rozman being harassed on social media.

[21] Subur was beaten with a score of 3–0 to an audience that peaked with 1.25 million concurrent viewers online, becoming the most-watched chess stream in history.