Mark Allen faces a fine from World Snooker after conceding a match-winning frame with 11 reds still left on the table at the World Grand Prix.
The former Masters champion was 3-1 down to Ali Carter and trailing 20 points to two in the fifth frame when he missed a straightforward yellow and screwed the white ball back into the middle pocket.
The Northern Irishman immediately conceded the frame, and with it the match, to gift Carter a place in the quarter-finals of the Coral Grand Prix, where he will play fellow Englishman David Gilbert.
Carter told ITV4: "We both started missing a lot and I think Mark missed the yellow there and he just saw red. We've all done it and fortunately for me it gives me the match, but I didn't want to win like that.
"We all make mistakes. I read in the paper the other day that Sergio Garcia hacked up a couple of greens and went into one in a bunker and you think to yourself 'What's he got to worry about?'
"But you get so entrenched in what you're doing and you are so frustrated, because it is your life. This sport is my life and golf is Sergio's life and it doesn't make an excuse but it gives a reason."
World Professional Billiards and Snooker Association rules state that "each member shall perform and compete to the best of his ability in each tournament in which he competes" and players are subject to disciplinary action if they concede a frame it is mathematically possible to win.
Carter booked his place in the semi-finals with a 5-1 victory over Gilbert.
'The Captain', who only hit one half-century break will face China's Xiao Guodong in the semi-finals.
World number one Mark Selby will attempt to make the final four when he takes on Judd Trump in the quarter-finals on Friday, after beating Noppon Saengkham 4-2 in the last 16.
Kyren Wilson takes on Barry Hawkins in the remaining quarter-final, after a resounding 4-0 win over Stuart Bingham.
World Grand Prix results
- QF Xiao Guodong 5-4 Yuan Sijun
- QF Alli Carter 5-1 David B Gilbert
- Rd 2 Mark Selby 4-2 Noppon Saengkham
- Rd 2 Kyren Wilson 4-0 Stuart Bingham
- Rd 2 Alli Carter 4-1 Mark Allen - (Allen conceded the last frame despite not needing snookers)
- Rd 2 David B Gilbert 4-0 Ding Junhui
- Rd 2 Yuan Sijun 4-2 Stephen Maguire
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