I wanted to study the standard corner groups like L-group, L+1 group, etc, so I created sgf problem files for practicing solving them.

If you're interested, these files can be downloaded from http://alum.mit.edu/www/eric_backus/. The files can be used with GoGrinder or other similar practice programs (and, for the GoGrinder iPad app, the problems can be downloaded using bundle ID 9f16f504).

Please let me know if you have any feedback, find any mistakes, etc.

Thanks for sharing! I'll have a go at it after work

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