Brumbies head coach Stephen Larkham rued the "stupid mistakes" made by his side as they fell to a shock 27-21 Cheetahs loss.
The former Wallabies fly-half said precision cost the Brumbies in Bloemfontein.
"We struggled to find a bit of rhythm in that first half, a few decisions went against us and we left a few points out there,'' Larkham told AAP.
''We made a few stupid mistakes and that certainly hurt us.
"In the second half, we let in two relatively soft tries and then we had to claw it back.
"We had opportunities to create a little bit of rhythm, but again similar to the first half, a couple of decisions went against us, or individuals again made some silly mistakes.''
Larkham appeared disappointed but not surprised that Henry Speight's try had been chalked off by the TMO after centre Tevita Kuridrani was ruled to have obstructed the Cheetahs defence.
"Tevita ran on the outside of the defending number 12 and it looked to me like the 12 made the decision to tackle Tevita, as opposed to making the decision to tackle Henry.
"But you're not going to get any of those 50-50 decisions over in South Africa, so we had to move on from that.
"I thought we moved on pretty well from that decision, but those little decisions really interrupt your momentum in the game.''