Arsenal maintained their bid for a Champions League spot as they edged past Brighton for a sixth straight Women's Super League win.
Vivianne Miedema put a good chance past the far post, while Emily Simpkins was inches away from an equaliser.
But as Brighton pushed forward, Arsenal broke and Beth Mead teed up Nobbs for a simple finish to seal the points.
Having seen rivals Manchester United replace them in the Champions League places with victory in their lunchtime kick-off, Arsenal responded in kind to retake third spot on goal difference with a game in hand.