Bring 'em On Down

This is one of the new possible maps for Sokoban Level 3 in Nethack Fourk and Level 2 in Hack'EM. It has 19 boulders and 18 holes, leaving 1 spare boulder.

---------------   ----------- 0 boulder
|.............|   |.........| ^ hole
|....0..|0..0.|   |.........| > starting position/downstairs
|.0..----.0.0.|   |.........| < upstairs
|---..........|   |....<....| + door
|..0..0.|0.00.|   |.........|
|.0.....|.....|   |.........|
|...0.---------   |.........|
|.0..0.0.|        |.........|
|.0.0.0..------------------+|
----..>..^^^^^^^^^^^^^^^^^^.|
   --------------------------

Strategy

All boulders are replaced by letters so they can be referred to. Moving the boulders is shortened to r for right, l for left, u for up, d for down. An asterisk is used to denote the last move filled a pit (and thus removed the boulder from the game). So "N ddrr*" means move boulder N two times down and two times to the right into a pit.

---------------   ----------- A u
|.............|   |.........| B drrr*
|....L..|P..R.|   |.........| D rdrr rrr*
|.K..----.Q.S.|   |.........| E rrrd rrrr rr*
|---..........|   |....<....| F drrr drrr rrrr*
|..I..J.|M.NO.|   |.........| A dddr rrdr rrrr rrr*
|.H.....|.....|   |.........| G rddd rrrd rrrr rrrr r*
|...G.---------   |.........|
|.F..A.C.|        |.........|
|.E.D.B..------------------+|
----..>..^^^^^^^^^^^^^^^^^^.|
   --------------------------

---------------   ----------- C lldd rrrr rrrr rr*
|.............|   |.........| H dddr rrdr rrrr rrrr rr*
|....L..|P..R.|   |.........| I rrdd dddr rrrr rrrr rrr*
|.K..----.Q.S.|   |.........| J lddd ddrr rrrr rrrr rrr*
|---..........|   |....<....| K rrdd dddd rdrr rrrr rrrr rrrr*
|..I..J.|M.NO.|   |.........| L lddd dddd rdrr rrrr rrrr rrrr r*
|.H.....|.....|   |.........|
|.....---------   |.........|
|......C.|        |.........|
|........------------------+|
----..>........^^^^^^^^^^^^.|
   --------------------------

---------------   ----------- M ulll lldd dddr drrr rrrr rrrr rrrr r*
|.............|   |.........| N ulll llll dddd drdr rrrr rrrr rrrr rrrr*
|.......|P..R.|   |.........| O ulll llll lddd ddrd rrrr rrrr rrrr rrrr rr*
|....----.Q.S.|   |.........| Q dlll llld dddd rdrr rrrr rrrr rrrr rrrr r*
|---..........|   |....<....| P ddll llld dddd rdrr rrrr rrrr rrrr rrrr rr*
|.......|M.NO.|   |.........| S llld llll lddd ddrd rrrr rrrr rrrr rrrr rrrr r*
|.......|.....|   |.........|
|.....---------   |.........|
|........|        |.........|
|........------------------+|
----..>..............^^^^^^.|
   --------------------------