AIRDRIE 4-1 PETERHEAD
Airdrie pounced on a second half collapse from Peterhead, who missed the chance to make up ground on the teams above them.
It had looked promising for the Blue Toon after Rory McAllister had given them an interval lead.
However, the hosts turned the match in their favour by scoring three goals in quick succession and they added a fourth in stoppage time.
Chasing a third straight win, Jim McInally's men were unchanged after winning so impressively against Queen's Park and they were on course for a second victory of the season at New Broomfield thanks to McAllister's 36th minute strike.
Holding off a challenge from Diamonds' recent recruit Simon Mensing, McAllister unleashed a shot, which flew past Rohan Ferguson and went in off the post.
Jack McKay, on loan from Leeds where his twin brother Paul also plays, came close to restoring parity in the 62nd minute when he rattled the upright.
The hosts nearly fell two goals behind in the 67th minute, Grant Anderson blazing a great chance over the crossbar and it proved to be a turning point.
Instead of being two-up, Peterhead were pegged back just a couple of minutes later. McKay beat Graeme Smith with a close range shot after the visiting defence failed to clear Sean McIntosh's cross.
Mark Wilson's team then gained the upper hand in the 71st minute. Adam Brown rattled the post with a crisp effort and Ryan Conroy was on hand to tuck home the rebound.
Peterhead's chances of finding a route back into the match were effectively over when Andy Ryan netted in the 76th minute. The former Forfar frontman collected a Brown pass and from the left side of the box, he rifled a shot inside the far corner.
The suffering was not quite over for the visitors as substitute Scott Stewart added Airdrie's fourth deep in added time with a fine solo goal.
With only bottom of the table Stranraer managing a win from the other four League 1 fixtures, this was a chance missed for the eighth placed Blue Toon to climb a congested table.
By Glenn Moir