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)

Steam Workshop::4 Player Chess

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How many blunders does an above advanced chess player make? - Quora

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Everbody knows back-rank checkmate but what about the side-rank checkmate? :) - Chess Forums

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engines - Scid vs. PC: a hint needed - Chess Stack Exchange