use lib "path/to/Chess path/to/Chess/Piece";

In this case, when you try to use Chess::Piece, Perl would look for "path/to/Chess path/to/Chess/Piece/Chess/Piece.pm" — so that likely won't work.

Perl essentially does the following to create the full path: 

use lib "searchpath";
use                 Chess::Piece;
                   /     /      .pm
=>      "searchpath/Chess/Piece.pm"

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In reply to Re^2: How to use a .pm file in a .pl file in another directory. by Eliya
in thread How to use a .pm file in a .pl file in another directory. by tommyxd

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