I will start with what you did:
I have started trying to use it in a different way.
1. Use it as soon as I can
2. make it small, 1-3 armies is ideal
3. dont use it somewhere that i cant afford let the enemy take
4. gamble that the territory i play it on will get taken this turn
5. Stop the other guy from going through it by keeping the pressure on somewhere else. it takes an attack of 19 to break a blockade card played on 3 armies in one turn. And the attacker will lose 7 of them.
1. Ignore this point. Its ridiculous. Use it when the other prerequisites are met. When you forsee a better opportunity of the usage of a blockade card somewhen in the future, it might be better to delay its use.
2. Ignore this point. Its not even ridiculous anymore, its plain stupid. Make it as small as neccessary, but dont use an "ideal" number, since an ideal number is arbitrary.
3. Ignore this point. Even if you can afford letting the enemy take the territory, respectively bonus be taken, it might be a good decision to still blockade if a good opportunity presents itself.
4. What is that supposed to mean? Clarify please. The way i read it, its the opposite of what you might have meant. Gamble that the territory you play it on will not get taken this turn makes more sense. If that is the case, its an incorrect advice. Sometimes you might have to gamble would be better. If not, ignore this point. Its stupid.
5. Ignore the latter part of this point. It just gives an example on the effects of taking down a blockade on an army stack. Be sure to exactly know how a blockade card works, before you read this valuable guide of advanced knowledge on when to use a blockade card.
Considering the former part of the advice, its not precise. There are circumstances in which a taken down blockade can be intentional by you. Ergo, ignore this point.
The educational value of all this is almost none, quite the contrary, if you follow this guide as it is, it will be harmful for your game.
Edited 7/20/2014 02:16:17