Boulder Halls of Zim

This is one of the new possible maps for Sokoban Level 2 in Nethack Fourk and Level 3 in Hack'EM. It has 14 boulders and 13 holes, leaving 1 spare boulder.

               ----------- 0 boulder
  ---------    |.........| ^ hole
 --.......|    |.........| > starting position/downstairs
 |..0.0.0.--   |.........| < upstairs
 ---..---..|   |.........| + door
   |..| |..|   |....<....|
----.----.0|   |.........|
|.0.0.0.|..|   |.........|
|........00|   |.........|
|.0.0.0.0..-------------+|
--.....--..^^^^^^^^^^^^^.|
 --.0...------------------
  ---.>...|
    -------

Strategy

               ----------- C d
  ---------    |.........| D ll
 --.......|    |.........| I uuu
 |..L.M.N.--   |.........| L r
 ---..---..|   |.........| I dddd
   |..| |..|   |....<....|
----.----.K|   |.........|
|.H.I.J.|..|   |.........|
|........FG|   |.........|
|.B.C.D.E..-------------+|
--.....--..^^^^^^^^^^^^^.|
 --.A...------------------
  ---.>...|
    -------

               ----------- G ddr
  ---------    |.........| K dddd rr
 --.......|    |.........| F rddr rr
 |...LM.N.--   |.........| E rrdr rrr
 ---..---..|   |.........| N rddd ddrd drrr rr
   |..| |..|   |....<....| L d
----.----.K|   |.........| M rrrd dddd rddr rrrr r
|.H...J.|..|   |.........| L urrr rddd ddrd drrr rrrr
|...I....FG|   |.........|
|.B.D...E..-------------+|
--..C..--..^^^^^^^^^^^^^.|
 --.A...------------------
  ---.>...|
    -------

               ----------- I rrrr rrdd rrrr rrrr
  ---------    |.........| D rrrr rrdr rrrr rrrr
 --.......|    |.........| B rrrr rrrr drrr rrrr rrr
 |........--   |.........| C rrur rrrd rrrr rrrr rrr
 ---..---..|   |.........| A rruu rrrr drrr rrrr rrrr r
   |..| |..|   |....<....| H rrdd rrrr rrdr rrrr rrrr rrrr
----.----..|   |.........|
|.H...J.|..|   |.........|
|...I......|   |.........|
|.B.D......-------------+|
--..C..--.........^^^^^^.|
 --.A...------------------
  ---.>...|
    -------