Ok, this bug is fixed now (at least 4 years old ... ). The explanation is
simple : the parameter "Always keep games with variations" was hidden
because of a simple UI bug, hence always ON : so even if those games are
strictly identical, the fact that they contain vars prevent them from
deletion.
I have a base I was maintaining with the latest sourceforge version (3.6.1 I
think) and I discovered that some duplicated games were not being detected with
the delete twins function. I tried exporting the games to pgn and then
importing to a new base but this did not fix the problem. If I imp
