Danny Wilson was left frustrated as his side continued their sluggish home form in the 1-0 Proact loss to nine-man Peterborough United.
Tom Nichols scored the winner ten minutes after the break, and despite Posh losing two men to red cards and relentless attacking pressure from the hosts, Chesterfield couldn't pull themselves level.
Manager Wilson gave his take on the afternoon: "We had enough chances and enough pressure but we also look at ourselves with the final ball, we got into some fantastic positions but wasted the opportunities to get good balls in.
"It's very frustrating overall to lose the game in the manner that we have, but again the performance was solid. We haven't had anything to worry about for most of the game, and that's another top six team that we've matched."
However, there were shades of controversy in the game's only goal, with Wilson far from satisfied with the referee's part to play in it.
"We've lost a goal from a corner and in the first half the referee didn't stop whistling from people impeding the goalkeeper. It happened for the goal and he didn't do a thing - it's completely flummoxing from my point of view.
"Then their goalkeeper has wasted so much time throughout the game and he doesn't ever receive a booking, if he had it would have quickened things up. The referee's control of the game was very poor today."
The match saw Wilson hand two Spireites debuts in his starting 11, with Gary Liddle captaining and on-loan defender Tom Anderson gaining his first Football League appearance, with their manager pleased with their showings.
"I thought they were both very solid," he said. "Tom was very commanding considering it was his first game and he never looked under pressure. He did what he does best and that's getting his head on things and putting the foot through the ball at times.
"Gary is a seven out of ten every week. He does his job, gets around the pitch and does the job very quietly. I thought they had very good debuts today."