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PerfectTablePlan will do an automatic seat assignment if you select File>Auto Assign Seats or the equivalent Main tool bar button.
Note The automatic assignment may try to put 2 'near to' proximity guests next to each other if no 'next to' proximity guests are available.
You can run File>Auto Assign Seats as often as you like. Click on the Stop button at any time during calculation to keep the best (highest scoring) plan so far. Select Edit>Undo to go back to the previous plan.
Note Guests who have been locked by you will not be (re)assigned by the automatic assignment.
A plan is scored as follows:
In addition VIP scores are multiplied by 3.
The scoring simply takes account of whether guests are sat next to or on the same table as other guests. It doesn't allow for whether the guests might be able to see each other or be within talking distance. This simplification allows the genetic algorithm to search the vast space of possible solutions reasonably quickly. You may have to tweak the automatic assignment a little 'by hand' to get the best possible result. For example you might have to move/rotate tables so that people who don't like each other aren't sat back to back. However you should find that the automatic assignment will be quite close to ideal, and this will save you a great deal of time.
You can set the stopping criteria for the automatic assignment in the Preferences window. The automatic assignment time goes up rapidly with the number of guests. This is in the nature of combinatorial problems.
The longer the automatic assignment is run, generally the better it will be. Select Edit>Preferences and on the Auto assignment tab click on seconds and set an appropriate number of seconds (1 hour = 3600 seconds). Then select File>Auto Assign Seats.
Note If you have a single core/processor PC you won't be able to do much else on your computer while the automatic assignment is running, as it will try to use all the power of the processor.