Plymouth boss Paul Sturrock admits he was 'gutted' to see his side slip up at Derby on Saturday.
The Pilgrims looked as though they had done enough to earn a share of the spoils at Pride Park as the game drifted towards a conclusion.
However, Rams ace Miles Addison had other ideas, with the youngster snatching a dramatic winner to keep the points in the Midlands.
Uncertainty within the Plymouth defence was to blame for the late drama, with Sturrock admitting his back four endured a costly lapse in concentration.
The Pilgrims coach explained: "Roman (Larrieu) called for it, he said he was going to come for the ball so the players left it to him and the next thing it's in the back of the net.
"I am gutted because the players gave everything they had today.
"It looked as if our hard work and desire was going to get us a result, but it's a strange game and it can kick you in the teeth at times.
"I thought we had weathered the storm, in fact a minute before the goal we should have scored at the other end.
"We have now got seven days to wait until our next game but I wish we had one tomorrow to get this frustration out."
Alan Judge had fired Plymouth ahead from the penalty spot after 17 minutes at Pride Park, only to see Jake Buxton level matters five minutes before the interval.
That is how things stood until the closing moments, with Derby boss Nigel Clough delighted with the manner in which his side continued to battle right to the death.
He admitted: "It's important at home that you get results.
"I thought we deserved to win on the balance of play. We were a little bit tentative early on for some reason but when we got going, we dominated possession.
"I thought we were dangerous from corners and free-kicks against a side that are good themselves at set-pieces."
Derby's celebrations were slightly tainted by an injury to striker Steve Davies, with Clough admitting he is uncertain as to how serious the problem is.
He said: "Steve is strapped from thigh to ankle but we don't know what the problem is at the moment.
"It could be a knee, ankle or both."