18世紀ロシア発祥とされる4人制チェス。盤は192マスで、中央の広い戦場に加え、四隅にそれぞれ「要塞」と呼ばれる4x4の小部屋が「門」1マスだけで繋がっている（門以外の境界は壁で、ルーク・ビショップ・クイーンなどの走り駒はもちろん、ナイトの跳躍even含めて一切通過できない）。4人は北・東・南・西に座り、それぞれ通常の16駒一式を戦場側に配置し、さらにルーク・ビショップ・ナイトを1体ずつ追加で要塞内に配置する（史料に配置図が見当たらなかったため、要塞の壁際に自動配置している）。手番は時計回り。向かい合う2人（北・南、東・西）がチーム。キャスリングなし、ポーンは初手2マスも可、盤の外周に到達すると昇格。敵チーム2人とも詰みに追い込めば勝利。
A four-player variant said to originate in 18th-century Russia. The 192-square board has a large open battlefield plus four 4x4 "fortress" rooms in the corners, each connected to the battlefield by exactly one "gate" square — every other point along that boundary is a solid wall that blocks all movement, including a Knight's jump. Each of the four players (North, East, South, West) sets up a full 16-piece army on the battlefield as normal, plus one extra Rook, Bishop, and Knight garrisoned inside their own fortress (no historical diagram of the exact fortress arrangement was available in the sources consulted, so these three are auto-placed along the fortress's back wall here). Turns proceed clockwise; players sitting opposite each other (North+South, East+West) are partners. There's no castling; pawns may still advance two squares on their first move, and promote upon reaching the board's outer edge. A team wins once both opponents have been checkmated.