[2] On her final appearance of the season, Polygamy was sent to France to contest the Group One Critérium des Pouliches over 1600 metres at Longchamp Racecourse on 7 October.

She was drawn on the outside of the seventeen runner field and was towards the rear in the early stages before making significant progress in the straight and finishing fourth behind Hippodamia, Comtesse de Loir and La Tulipe.

On her next appearance, Polygamy started 4/1 favourite for the 161st running of the 1000 Guineas over the Rowley Mile at Newmarket against fourteen opponents including Celestial Dawn, Highclere, Bitty Girl and Gentle Thoughts.

The filly appeared to struggle to match the early pace set by Bitty Girl and was under pressure from her jockey for most of the race but made progress into third place two furlongs out.

As in the Guineas, Polygamy had to be pushed along by Eddery from the start as first Riboreen and then Furioso set the pace, and did not move into contention until the field entered the straight.

Dibidale was considered an unlucky loser as her saddle had slipped in the closing stages, forcing Willie Carson to ride bareback in the final furlong.

The French-trained Matuta was promoted to third on the disqualification of Dibidale: the slipping of the saddle had dislodged the filly's weight cloth, meaning that Carson weighed in ten pounds too light.

[4] There was no International Classification of European two-year-olds in 1973: the official handicappers of Britain, Ireland and France compiled separate rankings for horses which competed in those countries.