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In page Two-round system:

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Two-round system advocates counter[citation needed] that the voter's first preference is more important than lower preferences because that is where voters are putting the most effort of decision and that, unlike Condorcet methods, to win under the TRS requires a good showing among the full field of candidates in the first round and also a plurality in the final head-to-head competition. Condorcet methods can allow candidates to win who have minimal first-choice support and can win largely on the compromise appeal of being ranked second or third by more voters.