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)

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King (chess) - Wikipedia

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grandmaster - Why do high rated players still take so much time to calculate a pawn endgame position close to a game that they (likely) had before? - Chess Stack Exchange

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Magnus Carlsen - Wikipedia

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