Why the extra rank on each side in 4 player chess? - Chess Stack Exchange

Why do we have an extra rank (marked with the red lines) on each side in 4 player chess? What could be the possible logic? (screenshot is taken from chess.com)

matrices - Can a dominance matrix be used for ranking? - Mathematics Stack Exchange

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Four-player chess - Chess Forums

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Understanding Chess Endgames, One Pawn Only

How are 4-player chess ratings calculated? - Chess Forums

rules - Escaping a double check - Chess Stack Exchange