The other puzzles I have studied change from complex to simple, once I found the solution and investigated that. Once a solution has become simple, I can see it. No calculation is required any more. It is clear. But the positions I'm talking about now, remain somewhat cloaked, even after the solution is investigated and has become well known. I am not able to see the entire solution, but I must still calculate parts of the solution.
So far, I haven't found the common factor in these positions. I hope you can help me to find that:
Only 7 out of 80 isn't too bad, of course, but I have the idea that I can learn something specific and important from these positions. Something that would help me in future positions. A way of seeing without the necessity to calculate.