The World Professional Billiards and Snooker Association has updated the list of the 124 official 147's to include the referees who were lucky enough to witness the perfect breaks close up.

The 124th maximum came only two days ago in the 39th UK Championship in York, sponsored by Betway and was refereed by the German referee Marcel Eckardt, who in his time as a referee has witnessed two other maximums as well as Mark Allen's.

Top snooker referee Jan Verhaas, has officiated six maximums, with the first coming in 2000 when he was lucky enough to have seen the Rocket Ronnie O'Sullivan compile his fourth career maximum against Quinten Hann at the Regal Scottish Masters.

Verhaas officiated O'Sullivan's 13th 147

Verhaas's last maximum was in last year's UK Championship in York when he witnessed Neil Robertson rack a 147 in the final against China's Liang Wenbo. Robertson, of course, was knocked out in the first round of this year of this season's UK by Peter Lines.

Ex-referee Alan Chamberlain, who resigned in 2010, has reffed seven maximums, the last of which came in the Maplin UK Championship when it was the Rocket's eighth career maximum out of 13. Dutch 50-year-old Verhaas also oversaw O'Sullvan's 13th and has officiated on four of O'Sullivan's incredible 147s. Steve Davis, who compiled the first ever TV maximum in 1982 at the Lada Classic, had his maximum overseen by Jim Thorpe, who was lucky enough to have seen the first ever official 147 made that year.

Ben Woollaston's wife Tatiana Woollaston officiated her first maximum this season at the inaugural English Open in Manchester watching Alfie Burden make his first career 147 and the total so far of maximums this season has leapt to six with Mark Allen's. Cliff Thorburn's first ever maximum at the Crucible was officiated in 1983 by John Smith.

The current tour of referees comprises of 25, with more than six female referees.

Ronnie O'Sullivan's controversial and rare 146 (see video), which was at the time slammed for not being his 14th career maximum in the Welsh Open which claimed his 28th ranking title, was refereed by female referee Desislava Bosilhova from Bulgaria, according to Cuetracker. The 24-year-old hasn't yet officiated any maximums so far.