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Hi uMoR,

You can use rel="canonical" tag. As your scenario above you should use this method described below.

First of all, you should decide which page is best related to your category or subcategory.

For example; Lets say that your best page is "/category1/subcategory1" and others have duplicated content. Then you should add html codes(rel="canonical" tag) to them.Lets add it;

"/category2/subcategory1" and  "/category3/subcategory1" pages html code:

<title>......</title>
......other tags.....
<link rel="<a class="attribute-value">canonical</a>" href="http://www.......com/category1/subcategory1" />

.........your content............

Good luck !

cprasad's and my purpose are same, so our responses will work. But just some diffrences;

"<ifmodule mod_rewrite.c="">" line checks wheter Apache's rewrite module is activated or not. If it is then it runs the code after that. The second one is that my rewritecond lines are less than cprasad's, but they all same conditions.By the way, i have just tested it before I wrote it.</ifmodule>

Just do it..

Hi Ben,

I am using Google Webmaster Tools and SeoMoz Tools for tracking and ranking, and also doing it manually. I am using a temp-cleared and unlogged browser for checking results.

On the other hand, this is not a new issue. I have come across with this problem for about 3 months.

I have problems with my website to google search results. Some of the important keywords frequently and sharply rankings vary a lot lately.

For example;

07-14-2012    Term1     Position #12

07-20-2012    Term1     Position #38

07-24-2012    Term1     Position #10

07-26-2012    Term1     Position #40

I wonder what is the cause of this incident? Is there any Penalties? If there is then how do i know this?

Hi uMoR,

You can use rel="canonical" tag. As your scenario above you should use this method described below.

First of all, you should decide which page is best related to your category or subcategory.

For example; Lets say that your best page is "/category1/subcategory1" and others have duplicated content. Then you should add html codes(rel="canonical" tag) to them.Lets add it;

"/category2/subcategory1" and  "/category3/subcategory1" pages html code:

<title>......</title>
......other tags.....
<link rel="<a class="attribute-value">canonical</a>" href="http://www.......com/category1/subcategory1" />

.........your content............

Good luck !