Kosumi: Go lessons with a move-by-move coach

Field notes

The learning path is organized into seven stages, beginning with liberties, capture, atari, and ko before moving through life-and-death problems, territory, and larger-board play. The page says daily problems are level-matched and missed ones return after a few days. For game review, it describes a win-rate graph and selected moves with alternative lines and explanations pitched to the player's level.