I remember when we first started playing and any reraise would be the minimum bet of the big blind. Now we realize that any reraise is the minimum bet of the the last raise.

There's still a little confusion. What about a re-reraise? Is it the minimum raise the amount of the last raise or the amount of the first raise? Someone told me that a re-reraise minimum raise amount is the size of the first raise.

Let's look at the example below. There are 3 raises going here.

EXAMPLE A:
Seat 1 posts 200 small blind.
Seat 2 posts 400 big blind.
Seat 3 raises to 1000 (a raise of 600).
Seat 4 raises to at least 1700 (1000 + 100 above a minimum raise of 600 =700).
Seat 5 raises to 2300 (1700 + minimum raise of the first raise = 600)

OR IS THIS CORRECT??

EXAMPLE B:
Seat 1 posts 200 small blind.
Seat 2 posts 400 big blind.
Seat 3 raises to 1000 (a raise of 600).
Seat 4 raises to at least 1700 (1000 + 100 above a minimum raise of 600 =700).
Seat 5 raises to 2400 (1700 + minimum raise of the last raise = 700)

Thanks in advance!