Republic of Ireland defender Louise Quinn thumped home a header to help Arsenal move to within a win of the Women's Super League title after a 2-1 victory against Everton at Meadow Park.
The Gunners took full advantage of their game in hand on second-placed Manchester City, moving four points clear at the top of the table with two matches remaining.
Quinn and Vivianne Miedema put Arsenal in control before Chantelle Boye-Hlorkah reduced Everton's deficit.
Birmingham came from behind to win 2-1 at West Ham, who had goalkeeper Anna Moorhouse sent off just before half-time for handling the ball outside the box.
Hayley Ladd scored from the resulting free-kick to cancel out Adriana Leon's opening goal. Chloe Arthur punished an error from substitute goalkeeper Becky Spencer at a corner to complete the turnaround.
Rinsola Babajide scored a hat-trick in Liverpool's 5-2 home win against Bristol City. Yana Daniels and Ashley Hodson were also on the scoresheet for the Reds while Danique Kerkdijk and an own goal from Galway woman Niamh Fahey made up City's goals.