hard · LSAT Logical Reasoning
Since switching from a five-minute time control to a fifteen-minute time control for its weekly ladder matches, the Bellhaven Chess Club has seen its members' average tournament rating rise by 47 points over six months. The club's president concludes that longer time controls in practice matches directly improve players' tournament performance.
The president's conclusion requires which one of the following assumptions?
- Every single member of the Bellhaven Chess Club takes part in the weekly ladder matches without exception.
- Fifteen-minute time controls are already used in most outside tournaments that the club's own members enter.
- The rating rise was not mainly due to weaker-rated members leaving the ladder and stronger members joining in their place.
- No individual Bellhaven Chess Club member's personal tournament rating ever fell or declined during the entire six-month period in question.
- The club's required membership dues stayed exactly the same when the new time control was introduced.
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