The previous post "konkurs dla taty" was my reply to my father's quiz for me. He sent me five old photos and asked to find him on them. In four cases I am 100% sure that I identified him correctly, and only in the case of the first photo I have doubts if I made a correct choice.
EDIT: My father confirmed that I made a mistake on this one. He is the third boy from left in the front row (that would have been my second choice).