The following list shows the correspondence between the map files used
in the Practice Round #1 and the base files in the
maps/preliminary-candidates directory
(https://github.com/takashi-chikayama/SamurAI-Dig-Here-2020-21/tree/master/maps/preliminary-candidates).

p1r01.dighere dy-corridor.dighere
p1r02.dighere ch-batsu.dighere  
p1r03.dighere hw-grid.dighere
