Quote from above quote:
During the opening of the duel is when you should be working for your best positioning on your opponent and this is therefore your best chance at chamber blocking and catching your opponent by surprise. During the heat of The Dance your positioning is rarely optimal and makes chamber blocking a much lower percentage move.
I fully disagree with this, the opening of the duel mostly involves a lot of holding and dancing in and out at the edge of your/the opponents range, very hard to chamber, and a chance that if you chamber, your opponent might be out of range for your chamberattack. Best moment to chamber is mid fight as soon as you notice your opponent feints a lot, or just does a lot of regular attacks. If you have a decent distance from your opponent and face him, you go in chamber alert mode, wait for his attack and boom.