[Jim Brier]

"In the situation with the full size blinds, you are calling two SB when you call a double raise."

In the normal $4-$8 structure, the small blind is $2. When you call a double raise preflop, it is costing you $8 which is four SB or two big blind bets.

"In the situation the situation with the smaller blinds, you are only calling one SB."

In the $1-$2 structure the small blind is $1. When you call a $4 raise, you are calling four small blind bets not one small blind bet. You are calling two big blind bets which is the same amount as in the first case.

"The situation is exactly the same effect as one sees when it is correct to limp for half a bet in the SB, but then fold to a BB raise."

It is not the same at all. The reason the small blind folds in this case, is because a big blind who raises is frequently showing a good hand and the small blind then re-evaluates his situation and decides to fold.