@verb #4529:"cm_backup" this none this rxdo #3135
@program #4529:"cm_backup" this none this
if ((this.sqnum = this.sqnum - 1) == 0)
  return -1
endif
this.cur_sq = this.move_list[this.sqnum]
this.move_list = listdelete(this.move_list, this.sqnum + 1)
return this.sqnum
"Last modified by whiz (#3135) on Mon Apr 26 20:23:20 1999 MDT."
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