囲碁講座 2009 08 02 石倉昇のあなたも囲碁仲間～入門から初段まで～三間ビラキへの打ち込み English subtitles.

NHK Go lecture 8/2/2009
Ishikura Noboru 9p and Takakura Kozue 6d amateur
3 point extension invasions.
The subtitles are mine.