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Can you think about an impossible position ?

#17, #18 You are correct. I am wrong. I lost and I resign.
Actually, in chess960 there are positions conceivable where you really can lose/win a tempo. ;)
@jposthuma : Any position containing this 3-pawn structure lichess.org/editor/8/8/8/8/8/7P/6PP/8_w_-_- is impossible to reach as well as this one with only one single pawn only lichess.org/editor/8/8/8/8/8/8/8/P7_w_-_-

Generalizing the last case, it is immediately obvious that actually no position with only one piece can ever be reached. Hence there are already 12*64 impossible positions (take any of the twelve different pieces and put it on an arbitrary square - not promoting pawns on the last rank...) These must be the simplest ones - except for the empty board...
#26
The first one is the possible one (with the black bishop on e5).
Don't want to spoil with a solution here.
#25 Black to move is an easy win. White to move easy draw.

Question: What does this have to do with yes/no impossible?

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