If the team had practised well, they could have won the trophy.
Explanation:
This sentence is an example of a third conditional. Third conditionals are used to express hypothetical situations in the past and their possible outcomes.
The structure follows the pattern: "If + past perfect, ... would/could/might have + past participle".
In this case, "had practised well" is the past perfect form, and "could have won" expresses a hypothetical outcome that didn't happen in the past.
This sentence reflects a situation that didn’t occur but imagines a different result if the team had prepared better.