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  PCHR = ["K", "Q", "R", "B", "N", "P"]
  w1 = "QRKPNB"
  w2 = "".join(sorted(w1, key=PCHR.index)) # Translate this to Perl ..
+.
  print(w1 + " -> " + w2)

  my $i = 0;
  use constant PCHR => split //, 'KQRBNP';
...
  my $w1 = 'QRKPNB';
  my $w2 = join '', sort { $pchr{$a} <=> $pchr{$b} } split //, $w1;
  print "$w1 -> $w2\n";