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)

On an 8x8 chessboard, a pawn has been placed on the third column and fourth row (C4). Is it possible to place nine rooks on this board so that no two rooks

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

Bughouse chess - Wikipedia

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King (chess) - Wikipedia

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strategy - Weak and strong squares - Chess Stack Exchange

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