I have two feature requests about checkers:
1) post the rules... preferably with a short description of the main features in each one and not based solely on references like "same rules as Internacional checkers but with a larger board". With so many similar variants being able to find the basics of the rules on a first click is a must

2) make a different border color for Czech Checkers and Corner Checkers (and possibly others). I just found myself playing CornerCheckers thinking I was playing Czech Checkers...fortunately by the time I noticed it I was winning already