June 10, 2025 - June 20, 2025
2025 UMB Bank Open Championship — May 16‑18 • $4,200 in prizes • Register now →
Aaron Grabinsky is an American chess International Master. Some of his greatest chess successes include winning the Master’s category in the 2016 US Open with 7/9; placing 4th in the 2016 North American Youth Championships with 6/9; and equal first in the 2017 Chicago Class Championships with 4.5/5.