In the book name 2/1 game force a modern approach by Neil H. Timm A convention called Golady is mentioned.

It is explained that this convention is used after 1♦-2♣(GF).

1♦ opener rebids are:

   *   2♦ - four-card heart suit (as if you bid 2♥)

   *   2♥ - four-card spade suit (as if you bid 2♠)

   *   2♠ long diamonds

   *   2NT balanced hand

   *   3♣ long clubs

Anyone has any experience with this or want to explain how it is used ? How does responder react ? How and when opener's show strength ?