A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
A player, 11 December 2007
During a battle, a Phoenix player has Shiba Miiko (Your Personalities at Miiko's Location have +1F for each Shugenja there.) , the Obsidian Dragon and 2 other shugenja at a battlefield. This gives the Obsidian Dragon 9F.
The opponent has Moshi Taya at the battle: "Battle: Exhange the Force of one of your target Naval personalities with the Force of a target Personality opposing him." Taya is also 2F and 2 PH -- meaning her force at the battle with Obsidian Dragon is 0F.
Then Taya takes her action and things get complicated. She targets the Obsidian Dragon, with his 9F. So, her force is now 9, and the Obsidian Dragon's force is now 0. First: is that correct? Or would the Obsidian Dragon's force be 2 (since he doesn't take the force penalty from his own trait.)
Then, the Obsidian Dragon's trait effects Taya's new force, reducing it to 7. (Her personal honor is still 2.)
Further, Miiko's trait still affects the Obsidian Dragon, taking his force from 0 to 3.
Is that how it works?
Zen Faulkes (rules official), 11 December 2007
((A) player has Shiba Miiko, the Obsidian Dragon and 2 other shugenja at a battlefield. This gives the Obsidian Dragon 9F. The opponent has Moshi Taya. Taya is also 2F and 2 PH -- meaning her force at the battle with Obsidian Dragon is 0F. (Taya) targets the Obsidian Dragon(...) her force is now 9, and the Obsidian Dragon's force is now 0. (I)s that correct?
Yes. See "Setting stats to a value": http://rules.l5r.com/Card_features#Gene ... bout_stats
Then, the Obsidian Dragon's trait effects Taya's new force, reducing it to 7.
No. Do not reapply bonuses or penalties after switching stats.
Further, Miiko's trait still affects the Obsidian Dragon, taking his force from 0 to 3.
No. Do not reapply bonuses or penalties. They are already part of the calculation for the stat and do not apply twice.