Wu Yize and Mark Allen’s semi-final is poised at seven frames all after their afternoon session ended with the longest frame in World Snooker Championship history, clocking in at just over 100 minutes.

Allen began the afternoon trailing 6-2 overnight to an opponent high on confidence and belief, but fought back in style, winning five frames in a row to edge 7-6 ahead.

The session at the Crucible Theatre concluded with a bizarre 14th frame, with a cluster of eight reds jammed around the black ball on the edge of a corner pocket. It resulted in a lengthy stalemate, 55 minutes passing without a ball being potted.

Allen led the frame 47-13, making it difficult for the referee, Marcel Eckardt, to call for a re-rack.…