Northern Ireland’s Mark Allen conceded his match in remarkable fashion as Ali Carter won 4-1 to reach the last eight at the World Grand Prix in Cheltenham.
The 32-year-old, who won three titles last year, was only 24-2 behind in the fifth frame when he conceded, having gone in off after missing a yellow.
There were 11 reds left on the table at the time – and a possible 115 points.
Carter will next face last week’s German Masters runner-up David Gilbert, who beat Ding Junhui 4-0.
Gilbert, who made the 147th official 147 maximum break last month, rolled in breaks of 101, 66 and a total clearance of 138.