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Winning against an international master...
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I remember having beaten a grandmaster for the first time about 20 years ago, and the feeling is so exhilirating and so exciting. Now that i have beaten so many grandmasters and international masters alike including FIDE masters ( reached hundreds already ), the feeling is still very exciting ( though not the same level as when i was starting to beat them ). Here is one youtube video of one of my most memorable wins against them...an international master rated 2900 in one popular online chess site- https://www.youtube.com/watch?v=PG5phMwwPIk