Leaping Michaels is a conventional 4♣ or 4♦ overcall to show a game forcing auction with a two-suited hand.

It promises a good two-suited hand with at least 5-5 shape:

• over 2♣ (precision club) or weak natural 3♣:

  • • 4♣ - 5+♦ and an unspecified major;

      • • 4♦ - show major,

    • 4♦ - 5+♥ and 5+♠,

• over weak 2/3♦*:

  • • 4♣ - 5+♣ and an unspecified major;

      • • 4♦ - show major,

    • 4♦ - 5+♥ and 5+♠,

• over 2/3♥:

  • • 4♣ - 5+♣ and 5+♠;

    • 4♦ - 5+♦ and 5+♠.

• over 2/3♠:

  • • 4♣ - 5+♣ and 5+♥;

    • 4♦ - 5+♦ and 5+♥.

*) According to Wikipedia

Optionally, Leaping Michaels can also be used in all situations when opponents are weak and have agreed on a suit.

Leaping Michaels promises a good hand with 17+ HCP counted in suits and side aces. 

Further the balancing bid.