Two second half goals, just eight minutes apart, were the difference as The Magpies recorded a tenth league win and eleventh clean sheet of the season, to keep up the pressure in the National League North.
A spirited first half saw the sides go into the break on an even footing but Chorley turned on the pressure in the second half, and reaped the rewards with captain Dale Whitham netting in the 74th minute and debutant Alex Samizadeh in the 82nd.
Chorley, playing in their black and white stripes started brightly, with Marcus Carver making run at the Galnsborough goal as early as the first minute, however keeper George Willis was able to scoop up the ball easily. A minute later a throw in found the Gainsborough penalty area, however there was nobody near it to make an impact on goal.
Two minutes later there was a moment of danger for Chorley, as the ball fell into the box, however the superb Rowley gathered the ball. In the fifth minute, Matthew Templeton broke on the right and had a free run up he flank, but the Chorley defence - looking as strong as ever with the introduction of on loan Nathan Sheron - were able to snuff out any attempt on goal.
It was then Chorley's turn to turn the screws as Carver crossed the ball to Cottrell, however two Gainsborough defenders were able to take the ball off him to prevent any attempt on goal. On 15 minutes the roles were reversed as Cottrell arrowed the ball to Carver, however he tumbled over a Gainsborough defender while trying to control the ball, which was lost in the process.
Three minutes later, Willis got caught way out of his box and a quick reaction from Carver saw him tapping the ball back to Blakeman, who fired in an almost perfect shot from 40 yards with the ball ending up on top of the net.
On 26 minutes an exquisite ball in from Challoner almost found Walker in a scoring position, however Willis gratefully caught the shot. A minute later saw Gainsborough's best chance of the game so far as Templeton's cross found Jordan Threwlis. The man in blue, in acres of space, had a free header which clattered the crossbar.
On 37 minutes, there were angry scenes as Adam Blakeman went in for a sliding attempt for the ball and appeared to upend Matthew Thornhill in the process and received a push to the chest in return. Whilst home fans appealed to the referee for a red card for the challenge, Mr Sarsfield consulted with his man on the line and pulled out a yellow card.
Blakeman tried another long range shot on goal just before the break but this one didn't have enough power on it to beat the keeper.
HT Gainsborough Trinity 0-0 Chorley FC
Chorley came out for the second half as lively as they finished the first with some lovely passing play on display. However it was the home side who had the first attempt on goal of note with a free kick just outside the Chorley penalty area. The visitors were let off as the ball rebounded off the wall and deflected out of play off a Gainsborough player.
On 56 minutes, Nathan Jarman crumpled to the floor as Roscoe - rising to head the ball - accidentally caught him. The Gainsborough captain temporarily left the field after receiving attention from his physio.
After a couple of minutes it was double danger for Chorley. Jarman took a free kick and his shot almost found the target, however Rowley saved his effort superbly. Shortly afterwards the keeper was called into action again - this time a reflex finger tip save tipped the ball over the cross bar and over for a corner.
A period of end to end football followed with the visitors getting more of a foothold in the game as the clock wound down. With just 16 minutes left to go, Dale Whitham unleashed a volley which was to end up in the back of the net and opened up the scoring for The Magpies.
At the other end of the field just 5 minutes later, Jarman ran through on the Chorley goal with the ball having been poked to him by Alex Wiles. The Boro captain and Rowley slid for the ball and ended up clashing; the referee awarded a free kick against Jarman.
Just ten minutes from time, Matt Jansen decided to make his first sub of the game by swapping Jason Walker for the young loanee from Bolton Wanderers. We'd seen plaudit after plaudit from Wanderers fans for Samizadeh and it wasn't going to be long before we saw why. Just two minutes and one ball after entering the field of play and the young Iranian arrowed a ball expertly into the bottom corner of the net, sending the Chorley faithful into raptures.
The win keeps us in 3rd spot in the National League North, behind Darlington 1883 on goal difference.
Starting XI: Shaun Rowley, Matt Challoner, Adam Blakeman, Nathan Sharon, Scott Leather, Stephen Jordan, Adam Roscoe, Dale Whitham, Marcus Carver, Jason Walker, Jake Cottrell
Subs: Dan Cowan, Will Beesley (89), Waqas Azam, Alex Samizadeh (Walker, 80), Josh O'Keefe
Goals: DALE WHITHAM (74) ALEX SAMIZADEH (82)