Blues coach Pat Lam says they got their tactics wrong in their 11-23 loss to the Reds at Auckland's Eden Park on Friday.
The Blues have now lost eight Super Rugby matches this season from nine starts and seemed to take a backward step in Round 10 after losing 30-27 to the higher ranked Highlanders.
The Blues defence let two Reds tries slip through in the first 5 minutes of the match and then another try early in the second half.
The Blues controlled much of the possession and territory in the second half after they trailed 8-15 at half time but they could not produce more than one Gareth Anscombe penalty with the advantage.
Blues coach Pat Lam said he was disappointed with his players effort and especially with the way they played tactically in wet weather conditions.
"As soon as the conditions caved in, it's quite a simple game," Lam told the NZ Herald.
"You've got to play field position and it's going to come down to who makes the least mistakes."
Lam also said that the Blues early mistakes which allowed the Reds to build points led to their sixth consecutive loss.
"It was quite a messy game but you really want to get on the front foot first and get ahead."
"Right from the start, we were chasing the game. They struck early and then fed off our errors."
Lam said that the match left him feeling frustrated again.
"Not with commitment and effort - I can see the boys working - but tactically it was poor," he said.
"Trying to play rugby in our own half when it's been bucketing down was pretty much suicide.
"It certainly wasn't part of the plan and that's something we need to address really fast this week."
"It's fair to say I was not happy at halftime."