Gobandroid Go Material

Gobandroid is a Free Software goban ( aka GO-Board ) for Android to learn and play the beautiful ancient game of Go (weiqi / wei-chi in Chinese, igo in Japanese, baduk in Korean)
Go originated in China more than 2,000 years ago. The game is noted for being rich in strategy despite its relatively simple rules. It has been claimed that Go is the most complex game in the world due to its vast number of variations in individual games. [1] [2]

Features:

Solve Tsumego ( Go Problems are called Tsumego or life&dead problems - similar to chess problems)
10 Tsumegos in easy, intermediate and hard from gogameguru included
Ability to automatically download >300 Tsumegos
Review games of go ( SGF Format reader )
Included commented and uncommented pro-games featuring googles deepmind alphago, lee sedol and many more
Record Games ( or use the phone/tablet as a board - incl SGF writer )
TV-Mode ( automatic replay of games - mainly for GoogleTV )
Play a go game against GnuGo ( extra install needed )
Share and receive shared games
Get information about certain go terms like Miai, Shape, Joseki
Links to some nice go related videos like the trailer to surrounding game or some tutorials to go
Ability to bookmark games
Support default sizes 19x19, 13x13, 9x9
alternative sizes between 2x2 and 23x23 ( But then no handicap support)
Edit positions ( mark-positions / freely set stones )
Available in >10 Languages ( Please join the translators at https://www.transifex.com/ligi/gobandroid to add/complete yours )

If you find a bug please email me or file a bug in the issue tracker on github. I can`t contact you via the Android-Market comments system to fix the problem
This app is Open-Source - the Source-Code is on github [3]- Patches/Contributions welcome! You can also find this project on googleplus: https://plus.google.com/106767057593220295403

[1] http://en.wikipedia.org/wiki/Go_(game)
[2] http://www.usgo.org/resources/topten.html
[3] http://github.com/ligi/gobandroid