I just realized that this blog still lists as goal of this project an engine that does not play stupid moves and is strong enough to beat myself.
I think this is accomplished, I don't remember the last time I was able to beat my engine, even if I give the engine a short time control and use infinite time for myself I have no chance.
So its time to set a new goal.
I will try to make the engine strong enough that it enters the Top 100 of the CCRL (Computer Chess Rating List). This is really a long term goal and will keep me motivated for the next time.