[2] Blackmore stayed with Abertillery for the majority of his amateur career, spending just two seasons outside the team when he left after a disagreement with the club.

[4] In 1909 Blackmore won his first full test cap when he was selected for the Wales team to face England in the opening game of the 1909 Home Nations Championship.

Played at the Cardiff Arms Park, Blackmore was the only new cap into the team, and joined Abertillery teammate, Jim Webb in the pack.

In 1910, Blackmore decided to turn professional, and left Abertillery to join English rugby league team, Hull Kingston Rovers.

[6] Jake Blackmore played as a forward in Hull Kingston Rovers' 10-22 defeat by Huddersfield in the 1911–12 Yorkshire Cup Final during the 1911–12 season at Belle Vue, Wakefield on Saturday 25 November 1911, in front of a crowd of 20,000.