Ireland international Joey O'Brien was shown a straight red card as St Patrick's Athletic punished Shamrock Rovers' indiscipline at Richmond Park.
Kevin Toner and Killian Brennan found the net in the second half after O'Brien saw red for a late challenge on Saints' Ryan Brennan.
The challenge looked more clumsy than deliberately reckless, but referee Graham Kelly took his time before upgrading the yellow card to a red.
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