sinan: There are missing solutions in A4 variation (unfortunately labeled as incorrect) such as (c2-d2-b3-a4-b2-b1-b4 or c2-d2-b3-a4-b2-b1-e2-a2-d3-c3-e3).
Ivan Detkov: I added your variant #1, but #2 looks like ko to me. Could you please clarify your idea?
I added your variant #1, but #2 looks like ko to me. Could you please clarify your idea?