Landing force shogi

Rules

All rules are same as in standart shogi (or other games, played according to crazyhouse rules. Bughouse variant is also possible), but it's allowed to capture friendly pieces. They are moved to reserve, just like captured opponent's pieces (they don't change side: side of captured pieces depends on player, who captured it) and they can be dropped under normal restrictions.

Notes

Another possible variant: only friendly captured pieces can be dropped.