Darren Ferguson challenged his Peterborough side to show more conviction as they need to “ride out the storm” having fallen to another damaging defeat.
Blackpool grabbed all three points thanks to a second-half comeback started by a Shayne Lavery penalty and completed in stoppage time by a deflected Karamoko Dembele strike.
Hector Kyprianou had given Posh the lead after 38 minutes with a near-post header from a Harrison Burrows corner but Posh fell to a fourth consecutive defeat.
“The decision-making in both boxes is not good enough,” said Ferguson.
“It’s a disappointment to lose another game and in the manner we lost it.
“We were in complete control until the goal, totally dominant in the first half but missed too many chances again and their equaliser changed the game.
“We had started the second half really well. We lost conviction and belief after that and started doing things we’d never normally do. We lost all composure for 10 or 15 minutes and didn’t create much at 1-1. They got on top of us.
“We’ve got to ride the storm now, stick together and try and get that belief and conviction back into the squad.
“The penalty incident was certainly right on the edge, it was a bad decision from Jed (Steer). That’s always the key to winning and losing.
“The finishing is not good enough, we’ve had three one-on-ones today, it’s just not good enough and we’re losing poor goals. The second one you can’t do much about but the first is a poor, poor decision.”
Blackpool boss Neil Critchley hailed his side as deserved winners, even if he was disappointed to concede another set-piece goal.
He said: “It was a terrific game, we were excellent. We got what we deserved.
“There wasn’t a lot in the first half, their best opportunities came from us giving the ball away.
“I’m really disappointed with the goal, we’ve shown a vulnerability at set-pieces recently. We wobbled a bit after that but the response in the second half was outstanding.
“We showed real character to come from behind and create the opportunities we did at a really tough place to come against a really good team.
“Kyle Joseph committing himself to get in there for the penalty epitomises the second-half performance. We were much more on the front foot, getting to the ball first and being much more aggressive.
“Him and Shayne were a real handful in the second half, really relentless with their running and work ethic.
“Shayne was the first to put his hand up when we were practising penalties in training yesterday so I was not surprised when he tucked it away very well.”
Bristol City Women 0-4 Man City Women: Hosts relegated as Fowler double inspires WSL leaders
Mary Fowler scored twice to set WSL leaders Manchester City on their way to a 4-0 rout of Bristol City, who suffered relegation as a result, on Sunday.
With Arsenal having drawn with Everton earlier in the day, Man City knew a victory would be enough to take the title race down to two teams.
That victory duly arrived in emphatic fashion, with all four of Man City's goals arriving in the second half.
Fowler's fantastic strike opened the scoring in the 62nd minute, with the Australia international doubling her tally soon after, paving the way for an Amy Rodgers own goal and Alex Greenwood's late header to seal a huge victory.
Arsenal are now out of the title race, with Chelsea - who have two games in hand on Gareth Taylor's team - the only side capable of catching Man City.
The Robins, meanwhile, will be playing in the second tier again next term.
Data Debrief: Bristol heading down with a whimper
Bristol City have failed to score in their last five games in the WSL, a run of 544 minutes without a goal.
They mustered just 0.09 expected goals (xG) to Man City's 3.4, with the visitors having now kept a clean sheet in nine of their 20 league games this season.
De Rossi demands more from 'tired' Roma ahead of crunch run
Daniele De Rossi acknowledged his Roma team may be tired, but he insisted they must not allow themselves to be embarrassed.
Roma fought back to draw 2-2 with last season's Serie A champions Napoli in a pulsating fixture on Sunday.
Tammy Abraham's late header secured a point for De Rossi's team, who took the lead through Paulo Dybala's penalty before going behind to goals from Matias Olivera and Victor Osimhen.
With Serie A set to have five teams in the Champions League next season, Roma occupy fifth spot with four matches remaining, but sixth-placed Atalanta are just two points behind with a game in hand.
There is also the small matter of a Europa League semi-final against Bundesliga champions Bayer Leverkusen on the cards over the coming weeks, and De Rossi set the stall out.
"We drew, it is not a result to throw away, but it is not the result or the performance that we wanted," Roma coach Daniele De Rossi told Sky Sports Italia.
"At times you can steal the ball off Napoli, but we then gave it back again too many times. Napoli had a lot of chances in the first half, we did better in the second, but we have to do better.
"Look, we are tired, but we cannot start thinking that we’re tired and that means we can be embarrassed in the final few weeks of the season."
Roma host Leverkusen on Thursday before taking on Juventus on May 5, with a crunch clash against Atalanta – who are also into the Europa League semi-finals – set to follow after the away leg against Xabi Alonso's team.
Key to a successful end to the campaign for Roma will be keeping Dybala fit. The Argentine has been involved in the joint-most goals (12) in Serie A since the turn of the year, scoring nine and setting up three, level with Juve's Dusan Vlahovic.
PSG's latest Ligue 1 title arrives as Monaco lose to Lyon
Paris Saint-Germain have been crowned as Ligue 1 champions after Lyon overcame Monaco 3-2 on Sunday.
A 4-1 midweek win over Lorient ensured that one more victory would be enough for Luis Enrique's team to get over the line, but PSG failed to get the job done themselves when they faced relegation-threatened Le Havre on Saturday.
That game was the 700th match of the QSI era at PSG, and the club's 1,900th in France's top flight.
However, PSG's wait to win their third straight title did not last long, as less than 24 hours later, Lyon – who will face the Parisians in the final of the Coupe de France at the end of May – came out on top in a topsy turvy encounter with second-placed Monaco.
Substitute Malick Fofana was the matchwinner for Lyon, and ultimately the player who handed the title to PSG.
Wissam Ben Yedder had put Monaco ahead in the opening minute, but quickfire goals from Alexandre Lacazette and Said Benrahma turned the match on its head before half-time.
Ben Yedder netted his second to restore parity on the hour mark, and thought he had sealed his hat-trick when he volleyed in from a free-kick, only to have strayed offside.
With only a win good enough for Monaco to stay in the fight, the visitors were then caught out in the 84th minute, with Fofana racing onto Lacazette's throughball and finishing calmly.
After a dismal start to the season, relegation looked a real possibility for Lyon, but they are now, with three games remaining, still in with a shout of qualifying for Europe.
PSG on the other hand now have 12 Ligue 1 titles to their name, with 10 of those coming under QSI's ownership. Aside from the COVID-impacted 2019-20 season, five of their last six league titles have been secured before the start of May.
It also means Luis Enrique remains in the running for a treble in his first season at the club, with PSG taking on Borussia Dortmund in the Champions League semi-finals next week.
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