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Message: <blockquote data-quote="Mithreander" data-source="post: 1142335" data-attributes="member: 13791">I would agree if this was the complete equation, but it is not. The 30% chance to block the attack is inaccurate (and so in turn is your later rendition of 25%), for if he rolls a natural 11, then the swordsman would have a 30% chance to block, but if he rolls anything above a natural 16 on his to-hit roll, then the swordsman would have NO CHANCE to block. Calculated out and the opponent has a 44.75% chance of still hitting, rather then the 35% that you had calculated. That means that that block is only serving a little more then a +1 to AC in preventing a hit, in this case. Opponent Rolls to hit | Swordman Needs to roll to block11 | 15 (30% chance to block)12 | 16 (25%)13 | 17 (20%)14 | 18 (15%)15 | 19 (10%)16 | 20 (5%)17-20 | n\a Below I've outlined what would happen, if against the same opponent, the swordsman had an oppertunity to raise his, what would happen to the chances of his opponents chances to hit him would be. AC +1 gives 41.25% vs. 45% chance. (Less then a +1 to AC bonus would give)AC +2 gives 37.5% vs. 40%AC +3 gives 33.5% vs. 35%AC +4 gives 29.25% vs. 30%AC +5 gives 24.75% vs. 25%AC +6 gives 20% chance to hit regardless if the swordsman has block or not.</blockquote>