1) The current rule is that to better an existing free agent offer you much increase the salary.
For example, if the current winning offer is a salary of $4.0 for 3 years a better offer would need to offer a salary of at least $4.3m (for however many years they chose).
2) The proposed change is to allow for an offer of the same salary but more guaranteed years to also better an existing free agent offer.
For example, if the current winning offer is a salary of $4.0m for 3 years a better offer would need either: a) as before, a salary offer of at least $4.3m (for however many years they chose), or b) a matching salary offer of $4.0m over 4 years, over 4 years plus an option, or over 5 years.
Note: offering the same number of years but adding an option does not increase the numbers of guaranteed years of the contract, so is not a better offer for the player. Note: any offer of a lower salary is not allowed, even if the length of the contract offer is greater and the total sum of salary would be greater than current winning offer.
Option 1) keep it how it is Option 2) allow free agency offers of the same salary but greater guaranteed contract years to better the existing winning offer.