Post Closed as "duplicate" by Herb Wolfe, Glorfindel, GloriaVictis, Ywapom, gdrt of
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Are there any legal positions known to be impossible to come to in a normal game?

There are some fairly obvious ways to set up a chess board that cannot possibly happen: both kings simultaneously in check would be one.

There are some positions that seem impossible in a normal game... for example, one side has all of it's original pawns in their original location and the other side has NONE of its pawns remaining - but with both sides displaying all pieces in their original positions (perhaps knights can do this, I don't know.)

However, seems like there may be some impossible positions that are not at all obviously difficult.

The question is if there are any known legal positions (preferably ones that a normal human might think are the result of a game) that cannot be played into?