-# ChessOK serial key (of the form NNNNN-NNNNN-NNNNN-NNNNN-NNNNN-NNNNN)
-# for looking up 7-man tablebases; undef means no lookup. Note that
-# you probably need specific prior permission to use this.
-our $tb_serial_key = undef;
+# Command line to run the Fathom tablebase lookup program, if installed,
+# including the --path= argument.
+our $fathom_cmdline = undef;