Chelsea surrendered top spot in the Women's Super League after Lucy Bronze's own goal meant they drew 1-1 with Everton at Stamford Bridge.
Sandy Baltimore gave Chelsea a deserved lead, but Everton found an unlikely equaliser as Bronze inadvertently turned the ball into her own net on her 150th WSL appearance.
Chelsea are now second in the top flight, two points behind Manchester City who thrashed West Ham on Saturday.
Sonia Bompastor's side dominated the early exchanges and eventually found a breakthrough from a well-worked corner routine, with a cushioned header across goal from Bronze allowing Baltimore to nod home.
Everton had been forced to withstand sustained pressure but drew level against the run of play when Yuka Momiki delivered a dangerous cross which struck the back of Bronze's heel and flew past goalkeeper Hannah Hampton.
Bronze almost made amends before the break when she rose to meet another delivery when a corner was recycled, but her header struck the crossbar.
Chelsea continued to pose a threat in attack but found Everton tricky to break down and were unable to create the clear-cut chances needed to get back in front.
The result leaves Chelsea trailing Manchester City in the WSL title race, who they host on Saturday, 14 November (13:30 GMT). Before that, they travel to BK Hacken in the Champions League on Tuesday (17:45 GMT).
Everton face Durham in the Players' Cup on Wednesday (19:00 BST), before they visit Tottenham in the league on Saturday (15:00 GMT).