安南将棋のルールThe Annan rule
縦の列で自分の駒のすぐ後ろ（自陣側）に別の自分の駒があれば、その駒は後ろの駒の動き方を借ります。後ろが空マス・盤端・敵駒なら、通常通り自分本来の動きです。
If a friendly piece sits directly behind another (toward your own camp, same file), the front piece borrows that piece's movement. Otherwise it moves as itself.
成り・二歩・打ち場所の制限は、駒の本来の種類を基準に判定します。
Promotion, double-pawn, and drop-placement rules are judged by the piece's true kind, not its borrowed movement.