Ohhh my bad, I assumed you'd want to blockade more if he attacked, since if he attacked, he likely deployed more there, where as if he didnt attack, he probably didnt deploy very much there, and so a large blockade would be a waste. Surely assuming if he didnt attack he still deployed heavily is not going to be true most of the time?

the size of the enemy stack is a factor that should go into your calculation of z1 and z2 (not the formula given here, but how you decide on what z1 and z2 you want to have)
You are correct, here i assumed him to have a bigger stack when not attcing (checking timis game you will see even if piggy didnt deploy at all and didnt attc, his stack would still be bigger than him deploying everything and attc after. z1=7 and z2=5 were integers i probably would have chosen)

If you face a situation where the stack actually is bigger if he attcs, your best deal indeed is to go with z1=z2

Edited 4/29/2016 13:48:31

Yeah, I guess it just relies on you correctly predicting the enemy armies and whether they'll deploy heavily even if they do not attack, but lots of good play relies on good predictions. So timi's blockade is just the specific solution to the optimal blockade for z1=z2: p=1.