amidama wrote:there are more ways of doing it
But anyway, if its quite strange if its considered normal
it does give game advantage from one side and its enourmously increase the time needed to finish the turn from another
example for 10 attacking units and 2 options per unit:
>10 actions for normal game
>100 just for order changing
>10 000 000 with turn redo

This number is amount of checks required to check the whole tree of decisions.
Bigger the tree that youve checked - more chances that you will find a branch, where you are stronger

and aparently even more people know about it than i though, if the first comment was correct
what mean that its essential for everyone for rank. am I wrong?

  amidama wrote:as for me there is a quick workaround. at the beginning of the turn send a random number representing this particular try. then if turn data is destroyed somehow, and new attemt is made, new random number will be generated and send to the server.

It will not stop people from using it, but will clearly show who are using it and who are not.
for example bad connection may force user to try again few times a day.
but heavy redo using will cause a few attempts per turn.

and yes, i mean that there are some easier way of destroying data than reinstall/logoff/delete file

and even with the turn redo is prohibited, order changing still allow a significant boost.