KNICOV - Where is my mistake?

I spent nearly whole the time on Knight Covering. Can someone tell me where’s my mistake, please? https://www.codechef.com/viewsolution/14285586

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for n = 3 and m = 14 the answer should be 11
where as your code gives 12
http://imgur.com/6wtW9yJ

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Here’s a link to my answer if you want to stick to calculating patterns.

Thanks a lot!

Thank you!