Store a history for a certain number of choices (perhaps around 100) so that if the matchmaker determines the same two items to be compared as one that is stored in the history, the earlier choice is automatically selected for the user again and bypassed without being displayed.
Exclude duplicate choices from the history for efficiency.
History should always reset to zero items stored if the session is closed (don't store store a user's history on the server).
Store a history for a certain number of choices (perhaps around 100) so that if the matchmaker determines the same two items to be compared as one that is stored in the history, the earlier choice is automatically selected for the user again and bypassed without being displayed. Exclude duplicate choices from the history for efficiency. History should always reset to zero items stored if the session is closed (don't store store a user's history on the server).