Quote Originally Posted by syntaxlies View Post
if shield A blocks 50percent of the time for 25 percent damage
and shield b blocks 25 percent of the time for 50 percent damage
shield a against 4 attacks that hit for 30hp and player has 100hp=2 blocks at 25 percent damage 60hp-25%=15hp blocked
shield b against the same 4 attacks = 1 block at 50%damage on a 30hp strike is 15hp

thats how.
The actual values in FFXI were such that kite shields (size 3 out of 4) provided the best mitigation over time. The large tower shields blocked for more but the block rate was too far from kite shields.