Their UK number ones included Knowing Me, Knowing You, Take A Chance On Me and The Winner Takes It All.

BBC: Abba will 'never' perform again

What we see happening is almost the winner takes it all.

BBC: Tech decision-makers 'need to take risks'

It is not yet winner-takes-all in the race for the Scottish Premier League title, but the psychology of victory could prove immensely important.

BBC: Brown & Diouf re-match adds spice to Old Firm derby