Kagetsu 花月, the 'flower moon', is the strongest DIRECT opening: white's second touches the centre sideways, black's third hugs it from above, touching both stones at once. Under naked renju rules black's attack here is judged a forced win — which is exactly why tournament play handles it with swaps and fifth-move proposals instead of letting it run free. White's fourth has paired up below, trying to build a wall. Show why the whole opening is feared: grow black's young diagonal into a full OPEN three.
Solve the remaining tasks to finish this lesson.