Gareth Ainsworth knows Wycombe Wanderers have a survival fight on their hands after losing 1-0 to 10-man Fleetwood Town.
Josh Morris scored the decisive goal at Highbury to keep Graham Alexander's men in touch with the automatic promotion pack and send the Chairboys closer to the relegation zone.
The home side looked in the ascendency until a costly moment of madness in the 13th minute. Alan Goodall swung a boot at the already grounded Nick Arnold, a straight red was justified.
But Wycombe, teetering on the fringes of the relegation zone, created little in a first half dominated by the 10 men. Matty Blair came closest to scoring but he blasted his shot over the crossbar after charging through the visiting defence.
David Ball had a chance to break the deadlock in the opening minute of the second half but Matt Ingram clung on to his blistering shot. But there was nothing the Wanderers goalkeeper could do when Fleetwood did grab the lead just before the hour mark.
A neat move through the middle saw Morris launch a 20-yard piledriver into the bottom corner of the net. It was the on-loan Blackburn midfielder's second goal in two games to help keep Fleetwood's automatic promotion hopes alive.
It forced Wycombe out of their shell and on the attack. Substitute Junior Morias tested keeper Chris Maxwell with a curling effort and with seconds of normal time remaining the forward flashed another shot past the post.
But Fleetwood hung on for victory to stay within three points of both second-placed Chesterfield, who they play on the final day of the season at the Proact Stadium, and third-placed Rochdale.
Ainsworth felt it was an opportunity missed by his team, he said: "I'm really frustrated. We had a glorious chance. We thought even a point would be good.
"When they went down to 10 men it was all very well thinking we could go and win the game but sometimes it's hard. The players didn't react. It was a sloppy goal.
"We've got to put this to bed quickly because we've got a huge game next weekend which to all intents and purposed will probably decide the future of this football club."
In contrast, Fleetwood boss Alexander was amazed by his side's resolve.
He said: "It was a vital result. We knew how important it was to get the three points.
"Then we went down to 10 men after just little more than 10 minutes. I was disappointed with that but from then on the boys were fantastic.
"The discipline, the work rate the boys showed, the good football they played when they got the ball down.
"To win 1-0 with 10 men for nearly 80 minutes is a great achievement."