Hull FC overcame the first-half dismissal of Liam Watts to edge out Castleford Tigers 26-24 and tighten things up at the top of Super League.
With Leeds Rhinos not in league action this week, Castleford had the opportunity to move two points clear at the summit on Sunday.
However, Daryl Powell's men were made to pay for an awful start that saw them slip 18-0 down before Watts was sent off for a high shot on Luke Gale.
The Tigers were able to get back into the contest with a numerical advantage and ultimately scored five tries to their opponents' four, yet it was Hull who prevailed as Marc Sneyd's accuracy with the boot proved decisive.
Hull are now one point behind the leaders, along with Wigan Warriors, whose youthful backline impressed in a 42-22 victory over Catalans Dragons.
Tom Davies and Liam Forsyth each crossed twice and there was also a brace for Joe Burgess as the reigning champions ran in eight tries in total.
Catalans fought back from 16-0 down to briefly lead through Louis Anderson's second score, but Wigan finished strongly to triumph with a degree of comfort.