Kinnock then resigned as leader and was replaced by John Smith. Smith's leadership once again saw the re-emergence of tension between those on the party's left and those identified as "modernisers", both of whom advocated radical revisions of the party's stance albeit in different ways. At the <answer>1993</answer> conference, Smith successfully changed the party rules and lessened the influence of the trade unions on the selection of candidates to stand for Parliament by introducing a one member, one vote system called "OMOV" — but only barely, after a barnstorming speech by John Prescott which required Smith to compromise on other individual negotiations.
When did Smith change the party's rules?
1993