The specialized functions are introduced in later katas in the series.

fixed at some point

Good catch! Fixed it.

myjinxin's kata is older than mine. but as K01egA said, you can solve it with a simpler algorithm than mine, because you need not take draws into account

Description amended in this fork

done

Well spotted. Fixed. Thanks!

I edited the description; thank you.

Fixed.

While I appreciate the suggestion, I prefer having the user find out earlier rather than later whether their solution is efficient enough. I'm also hesitant to make changes not suggested by the reviewers in the beta phase.

Fixed

Corrected, thanks!

Fixed.

fixed