Judd Trump puts together a "wonderful" break, a tournament-high 141, as he pulls a frame back against Thailand's Thepchaiya Un-Nooh at the Crucible.

Ronnie O'Sullivan talks through his shock defeat to amateur James Cahill in the first round of the World Snooker Championship at the Crucible in Sheffield.

Watch the shot which lead to five-time champion Ronnie O'Sullivan suffering a shock first-round defeat by amateur James Cahill at the World Snooker Championship.

Amateur James Cahill pulled off the biggest shock in Crucible history as he completed an astonishing 10-8 first-round win over five-time champion Ronnie O'Sullivan.

O'Sullivan trailed 5-4 overnight and the increasingly rattled world number one slipped 8-5 behind, missing countless simple chances against the 23-year-old qualifier.

A jaded-looking O'Sullivan then somehow found some form, scoring breaks of 104 and 89 to level.

But Cahill, who does not even have a world ranking, showed remarkable composure under pressure to get over the line. Read the full report here.

Image source, Getty Images

Amateur and crucible debutant James Cahill stuns Ronnie O'Sullivan in the opening frame of their first-round match at the 2019 World Snooker Championship.

Image source, Lab42

World number eight Kyren Wilson unwinds playing snooker's new computer game ahead of his opening World Championship match.

Read more here.

Three-time champion Mark Selby survived a scare to beat world number 67 Zhao Xintong 10-7 and reach the second round of the World Championship.

An out-of-sorts Selby fell 5-1 behind but dug deep to reduce the gap to 5-3 at the end of the morning session.

The world number two took control, using all his experience to win five of the next seven frames and progress.

Read the full report here.

Image source, PA

Last year’s final saw Mark Williams win his third World Championship - 15 years after his last - by holding off John Higgins' stunning fightback in a classic Crucible final.

Williams, 43, won 18-16 to become the oldest champion since fellow Welshman Ray Reardon, who was 45 in 1978.

He won seven frames on the trot to take a 14-7 lead but Scot Higgins, 42, came back magnificently to take eight of the next nine and level at 15-15.

However, Williams responded in style to secure a famous victory. Read the full report here.

Full BBC TV and online listings for day four of the World Snooker Championship.

Tuesday, 23 April

Live

10:00-12:15 & 13:00-18:00,BBC Two

10:00-14:00, 14:30-18:00 & 19:00-23:00, BBC Red Button

Tables one & two, 10:00-14:00, 14:30-18:00 & 19:00-23:00, BBC iPlayer, Connected TV and online

Highlights

23:15-00:05,BBC Two

Extra

00:05-02:05,BBC Two

The World Championship is snooker's biggest event and has been staged since 1927. It has been hosted in its modern form by Sheffield's Crucible Theatre since 1977.

It is one part of snooker's 'Triple Crown' events alongside the UK Championship and the Masters.

The event has seen some of the biggest names in snooker throughout the decades win the trophy, including Stephen Hendry (seven titles) and Ronnie O'Sullivan (five titles).

Image source, Getty Images

Whether you choose to play competitively or socially, snooker is sure to get your brain working.

It requires skill and concentration and will improve your focus and hand-eye coordination.

Anyone can play regardless of age, gender or ability and it's not an expensive sport to get into.

Snooker is essentially a simple sport, once the rules of the game have been learnt - to do just that click here, external.