@Wolfram_EP Right now im doing this as simple as possible and fast, just to do the homework. I made 2 surveys/quiz, same tasks one of the survey i gave only to chess players and 1 survey to non-chess players who I consider not being stupid at all (Having great marks at school, good jobs). But now it seems that chess players are dominating the non-chess players and that is what my hypothesis was that chess increases logical thinking. I know that there are many aspects what may affect this. If i would take it much serious probably i should go to labratory and check how the people brain works while solving.. now it is just some small project. Probably doing this on kids would be the best, but don't have that much time for this. If i wouldn't do it on last possible moment, than i would have thinked more and done it better. Making the survey wasnt the hardest part now i need to make alot of paper work what affects my time (stupid rules). Many aspects and much resources might be needed for the perfect project and probably internet is not the best choice, because some might lie, might make 2nd and better attempt, but dunno will see. The third task with horses now seems to be the most difficult for chess players, probably because didnt check that picture carefully, probably you can make good conclusion from that too. The 2nd has pretty good ratio solving it. thx for the feedback