Li Shenron
Legend
Got to answer this question to some players
and I came up with as an explanation on the fly that Fighting Defensively and the feat Combat Expertise represented parrying:
Fighting Defensively can be done only when attacking (single or full attack) and may represent a basic parrying that everyone can do without specific training, but as such it is not very effective, and it doesn't scale with BAB (although Tumble increases the bonus). The penalty to attacks repreesnt the fact that you are using the weapon to defend yourself rather than attacking: when you don't fight defensively, you are not parrying but you use the weapon at its best offensive capability.
In reality, FD is probably a combination of both dodging and parrying.
However FD can be done also when attacking with a ranged weapon, which cannot be explained as parrying!
Combat Expertise is more likely the real parrying technique, it requires some basic training (taking the feat) and improves with the character's general fighting ability (BAB) although only up to a point (+5).
It still requires to be attacking and it works only in melee, that's why I think it could be parrying, but again it can be seen as a combination of dodging and parrying.
I also thought about Total Defense, but I didn't mention it because you can do it even when unarmed...
Let's not be too pedantic about the fact that the bonuses have the dodge type. Probably parrying would deserve a deflection or shield* type, but the important thing here is to make the bonus stack.
*for example Two-Weapon Defense gives a shield bonus, that's definitely another kind of parrying, specifically associated to 2WFing
Any thoughts?

Fighting Defensively can be done only when attacking (single or full attack) and may represent a basic parrying that everyone can do without specific training, but as such it is not very effective, and it doesn't scale with BAB (although Tumble increases the bonus). The penalty to attacks repreesnt the fact that you are using the weapon to defend yourself rather than attacking: when you don't fight defensively, you are not parrying but you use the weapon at its best offensive capability.
In reality, FD is probably a combination of both dodging and parrying.
However FD can be done also when attacking with a ranged weapon, which cannot be explained as parrying!
Combat Expertise is more likely the real parrying technique, it requires some basic training (taking the feat) and improves with the character's general fighting ability (BAB) although only up to a point (+5).
It still requires to be attacking and it works only in melee, that's why I think it could be parrying, but again it can be seen as a combination of dodging and parrying.
I also thought about Total Defense, but I didn't mention it because you can do it even when unarmed...
Let's not be too pedantic about the fact that the bonuses have the dodge type. Probably parrying would deserve a deflection or shield* type, but the important thing here is to make the bonus stack.
*for example Two-Weapon Defense gives a shield bonus, that's definitely another kind of parrying, specifically associated to 2WFing
Any thoughts?