6th का स्वामी 6th house मे हो और विपरीत २ाजयोग मे ना हो , लगनेश ज्याद। बली ना हो । सिँह लग्न मे तो इसे अच्छा माने या बूरा ।
If your sixth lord is strong that is good for both good and bad aspects of the 6th house it will give you ample struggles but at the same time good competative ability; the only thing is that Saturn should not make relationship with the Sun.