Tatmadaw, without air power.

According to unverifiable local sources, the Kokang rebels scored a major victory by inflicting over 70 enemy casualties  (there are graphic photos of the body-count elsewhere) belonging to the Tatmadaw 66th Light Infantry Division two days ago.  The rebels credited their victory by the absence of the Myanmar air force
 

http://www.rfa.org/english/news/myanmar/kokang-border-03182015165838.html

Kokang rebels fighting against Myanmar’s army captured a government position near the country’s border with China on Wednesday, killing seven Myanmar soldiers while losing two rebel fighters, local sources told RFA’s Mandarin Service.

Government forces shifted to using ground forces and artillery to attack the rebels after an incident last week in which Myanmar’s air force mistakenly dropped bombs on Chinese territory, killing four sugar cane farmers and drawing a stern warning from China.

"Gun battles continued from last night until dawn as the Myanmar military launched an artillery bombardment against rebels. Even though we don’t know where the government force is targeting, but we can hear explosions from heavy artillery fires,” said a Kokang border area resident who gave only his surname, Yuan.

“There are no more Myanmar military air planes in the sky, however. They might fear Chinese fighter jets,” he told RFA, referring to sorties China’s military has been staging in response to the cross-border attack on March 1