On Saturday, in a telephone conversation, Oliver agreed to grant Yana an easement for a pipeline across land owned by Oliver for consideration of

On Saturday, in a telephone conversation, Oliver agreed to grant Yana an easement for a pipeline across land owned by Oliver for consideration of $500, Oliver to deliver a deed to the easement and Yana to pay the $500 on Friday.  On Tuesday Yana wrote Oliver, "This confirms our agreement of two days ago whereby you will deed me an easement for a pipeline across your land for which I will pay you $500.00 and that you will deliver a deed to the easement this coming Friday and that I will pay you for it then." Yana signed the letter and Oliver received it on Wednesday. On Thursday Oliver phoned Yana to tell him that he'd changed his mind about the easement. Yana threatened to sue Oliver for breach.

1. Could Yana win? why?

2. What legal rules or principles apply to the facts of this case?