John Mousinho hailed a special day as Pompey took another step towards promotion with a hard-earned win at the home of Peterborough.
A superb defesive performance ended in the Blues becoming the first team to stop Posh scoring at home in the league this season - while Kusini Yengi's fine finish 14 minutes from time, set up by Gavin Whyte, turned one point into three.
Pompey lead the table by five points - and are nine clear of third place. They have seven games to play while a couple of rivals have one extra.
Delighted Mousinho told the club media: 'It was a superb result. At this stage of the season that’s what it’s all about, but I thought it was a great performance as well. We had a couple of things to adjust at half-time against a really good Peterborough side – if you get the slightest thing wrong they can punish you.
'You need to get the press just right and land on those second balls otherwise they will really get at you. Christian went off with a hamstring injury and we think it’s a neural one like he’s had before, rather than a tear. Hopefully it will be no longer than a couple of weeks out.
'With the way the game was panning out, and knowing that Colby can do that 10 position, it made sense to get Kas on. It seemed like it would be the right decision and it’s obviously paid off – if you’re a centre-half facing those two then it’s going to be a difficult proposition.
'I thought it was probably the best defensive display of the season and because we pressed so high up the pitch, it can leave you exposed. But Peterborough look extremely good if you drop off them and let them have possession, so we took the risk and restricted them to so few chances.
'Gav came on and was excellent – we rightly expect a lot from him and so we know that’s what he can produce. We broke from deep and Kas got at his man and then put the ball in the net, so I’m thrilled for him. It wasn’t an easy decision to leave him out of the starting line-up.
'There was pure relief at the final whistle and it was a special day because that’s probably the best away atmosphere I’ve experienced.'
Pompey now have the best part of a fortnight off before travelling to Wycombe on Good Friday then hosting Derby the following Tuesday.