I am tanking 3 of 5 accounts this season. There are easy ways to do it, and yes, you try your best to not win. It makes is easier when you play your GK out and put a weak player in as GK. But dont let that fool you - I have won games I tried to lose and won games I had no right to win. The game engine is the judge, jury and executioner when it comes to winning/losing and it is illogical at the best of times.