An opening bid of 2H shows five hearts and four spades.
In all other respects the convention, and the responses, are the same as the Flannery two diamonds.
A bidding convention is an agreement between two players on a different meaning of a bid in the card game bridge. These agreements are made so that partners can more quickly determine which contract, with both their cards, they can win together. Often, conventions are forged together into one, which is then called a bidding system.