Advantage Detection Guide:
Part of the Beginner's Chess Guide (Section 3)
Equality is simply when both players have the same amount of Pawns and Pieces on the Board and neither has any Positional Advantage over the other.
There's often a lot of Symmetry to the Moves, which help maintain an Equal situation.
If both players make the same, mirroring moves, there'll be Equality.
If both players capture an opposing Pawn or Piece, in a mirrored position, there'll be still be Equality.
Only when different Moves are made and/or when different material is captured, will there no longer be any Equality on the Board.
Moving On: Mobility (Page 5).
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