Any chessman other than a pawn symbolises disturbance, tumult and argument.
The same is the interpretation if a person uses walnuts or almonds instead of chessman in a chess game.
Content related to the chessman symbol in the dream to be added later. Keep searching for other symbols you see in your dream
The dream symbol you are looking for is absolutely there, try searching the symbol one by one.
I was in a highschool restroom and a woman was hiding in there to hurt others, i was trying to solve the mystery and got a woman and man to help, first it was nearly empty, then there were lots of women in there