Overcapping vs Block Chance Reduction?

To preface this, yes, I did search for an answer to my question. But the wiki and PvP threads were inconclusive.

Thus, I ask: Does "Block Chance Reduction" work like "Penetration" or like "Resistance Reduction" from curses and other sources?

I strongly suspect that the answer is the former, as reduction is typically an effect (debuff) applied to an enemy that changes their stats, while penetration is an on-hit player stat (cannot apply to DoTs) that takes the enemy's resistance at the time of the hit and removes a quantity equal to the penetration value (thus ignoring overcapping). Thus, since Block Chance Reduction is not a debuff applied to an enemy but a player stat applied to one's own attacks, it shares more similarities with penetration than reduction.

But it would be still nice to confirm.

I haven't confirmed this with GGG or anything, but I've always thought of it functioning like pen.

Tested that on multiple characters (involving capped block with The Anvil + rumi) and no you can't overblock, BCR is a straight "percentage" (it doesn't lower your value by a straight value) who can't be mitigate in any way.

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IceDeal wrote:

Tested that on multiple characters (involving capped block with The Anvil + rumi) and no you can't overblock, BCR is a straight "percentage" (it doesn't lower your value buy a straight value) who can't be mitigate in any way.

Wait, so you're saying that BCR is (Block Chance) * (1 - BCR value) and not (Block Chance) - (BCR value)? e.g: If Block Chance was 20% and BCR value was 40%, end result would be 12% Chance to Block and not 0% (-20%)?

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Epee wrote:

Wait, so you're saying that BCR is (Block Chance) * (1 - BCR value) and not (Block Chance) - (BCR value)? e.g: If Block Chance was 20% and BCR value was 40%, end result would be 12% Chance to Block and not 0% (-20%)?

Yep you got it, would be way too strong otherwise.

it lowers the percentage of your capped block value. it works like pen gems, it mitigates the block% according to the capped block instead overcapped amount.

It's all explained there :
https://www.pathofexile.com/forum/view-thread/880676/page/1

Ah, I see.

It was hard to get past the salt over legacy tree decisions and old PvP balance (lol ES not being an issue), so I probably didn't get to the part that actually explained how things worked.

Although, in hind-sight, I should've figured how odd it was that they were talking about 100% Block Reduction when, in a model defined by subtraction vs multiplication by a percentage, why this would be relevant if 75% reduction would be sufficient.