The Wikipedia article linked in the comments gives a nice discussion of this kind of problem; I especially like the "Other host behaviors" section. If you understand that section, I think you've mastered the Monty Hall problem. Since you are particularly interested in your second question ("And if don't re-select are my chances to win 1/10 or 1/9?"), I'll address that question.
Notice that no matter what you pick (empty or gold), there are at least 8 empty buckets out there that you didn't select. So, it's no trouble for me to peek in all the buckets, pick one of the unselected empty buckets at random, and show you that it's empty. In fact, I can pick 8 of the unselected empty buckets at random and show them to you without giving you any new information about your choice. You still have the 1/10 odds you started with.
However, if I start showing you unselected buckets without peeking inside, and they turn out to be empty, that's a different situation. Notice that there's no suspense in the first version (you know I'm going to show you empty buckets), but there is suspense in the second version (neither of us know what's in the bucket). In this version, for every bucket I show you, you gain new information and can adjust your probability estimate-- after I reveal one empty bucket, you are excited that it was empty and can adjust your odds of winning to 1/9.