By John Morgan, MMA Underground The win over Gilbert Burns on Saturday was the Chechen’s first UFC fight to go three rounds, but it proved to be more valuable to him than another quick finish. Undefeated welterweight prospect Khamzat Chimaev faced the toughest test of his professional career thus far, but he ultimately outpointed an incredibly game Gilbert Burns at Saturday’s UFC 273 event. After being hit just once in his first four UFC appearances combined, Chimaev was forced to endure 119 significant strikes from “Durinho” in the clash, per UFCStats.com. He was clearly wobbled in the second…