Defense and blocking basics

[Onett]

Could someone explain the basics of blocking and defense to me?
I'll list some things I've read:

- defense drops to zero when moving around
- blocking drops to 1/3 when attacking or running
- chance to block is limited to 75%

Are those statements correct? When does blocking and defense remain at their regular levels?

Thanks.

[Hrus]

Truth is:
- Walking or attacking doesn't affect blocking and defense
- Blocking drops to 1/3 when running
- Chance to block is limited to 75% (to 25% when running)
- When running Defense doesn't drop to zero, the whole Chance To Hit (CtH) formula (which also depends on attacker and defender level comparison) is skipped (but you will still have 5% to not be hit due to hit chance limited to 95%)

CtH formula:
CtH % = (100 * AR / (AR + DR)) * 2 * (atLvl / (atLvl + dfLvl))