Manchester United's dramatic 3-2 victory at the Etihad put Manchester City's Premier League title celebrations on ice - so when can Pep Guardiola's side be crowned champions now?
Leading 2-0 at the break on Saturday evening, it looked as though City had the title wrapped up with six games remaining.
Cue a remarkable comeback from United, with Paul Pogba's double levelling the match before Chris Smalling struck a 69th-minute winner.
Despite the defeat, City still have a healthy 13-point lead over United in the Premier League table - so when can they actually confirm their third title in six years?
No title win at Wembley
City's next league match comes at Wembley against Tottenham on Saturday, April 14 - live on Sky Sports Premier League.
Even if City leave London with all three points, the title will not be confirmed. However, if United then go on to lose at home to West Brom the following day, then the title race will be over.
The only outcome that sees City win the league on the weekend of April 14-15 will be victory over Spurs followed by a defeat for United to West Brom, which is also live on Sky Sports Premier League.
If not April 15 - then when?
With a 13-point gap over United and six games remaining, City essentially need six points - or two wins - to confirm the title.
That means if City can follow up a win at Spurs with victory over Swansea on April 22, then the title is theirs.
However, there is yet another permutation to throw into the mix in the form of United's midweek clash at Bournemouth on April 18. Should the 13-point gap be maintained going into that encounter, then United must avoid defeat to keep their slim hopes alive.
Could it be even later?
Of course, if United keep winning and City keep losing, the gap will continue to close.
If Spurs beat Guardiola's side on April 14, then United know that victory over West Brom and Bournemouth will delay the celebrations until at least City's trip to West Ham on April 29.
The prospect of not confirming the title until May appears highly unlikely, but the calculators could well come back out later this month if City continue to slip up.