A very nice app for go practice
I like this program very much. It offers lots of tsumego problems of varying difficulty (30 kyu to high dans). Its interface is very clean, it certainly have been designed with lots of care. As I see after few days of using this app new problems are still being added. Few things that might be improved: the possibility to switch coordinates on/off would be good, the indicator of which problems I have solved could work faster. This are however very minor issues. This is a very good tsumego problems library, I think it will be useful to all go players. Moreover, it is free to use. A very good move to popularize the great game of go.