My best guess would be master games. You could try chessgames.com. They have a myriad of master level games you could go over. You can learn a lot about theory1`
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If you have a specific opening in mind, then look it up in the "search forums" box. All the threads are archived and there have been lively discussions of the plans and purpose of most openings at one time or another.
Hi I am just wondering where you can find some opening theory for free?
Thanks Thomas