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« on: January 16, 2015, 07:46:15 pm »
So, in the raws, Bucklers have BLOCKCHANCE of 10, while Shields have BLOCKCHANCE of 20.
Therefore, a shield is approximately two bucklers, and two bucklers are approximately one shield.
So, in terms of full shields, my adventurer has ~21.5 shield's worth of protection.
Given that each shield's utility decreases by approximately the same factor as your first shield's (most practical way for the math to function - at or above two-thirds, the utility reaches and exceeds 100%). Assuming my adventurer has an approximate chance of blocking of 50% (due to being Legendary+Whatever, this is probably closer to 99.9999...%, but this makes the math easiest), the approximate overall utility of my 14 shields and 15 bucklers is very, very close to 1.
The utility exceeds 99.9% upon 10 shield's worth.
Therefore, the minimum number of shields to get near-complete protection is 10; near-complete, in this case, is defined as "99.9% PoB or higher".
EDIT: However, going by Platinum shields and bucklers, one buckler weighs approximately 81.5% that of a shield; therefore, while two bucklers are approximately equal to a shield in terms of raw blocking power, their weight is approximately 1.63 times that of a single shield. Bucklers are the lighter option, but only when one instrument of blocking is held - otherwise, shields are the most efficient, by far.