J-Group

Introduction

This a series of problems by David Mitchell thematically linked to his videos on our YouTube Channel on the L-Group and the Door Group (last section of video).

There are four problems and the solutions are given in his J-Group video. The idea is to try to solve them before looking at the solutions…

Problem 1

The key points that solve this problem are needed for the following three problems.

sgf

Problem 2

White played F2 and Black made the tiger mouth. This is wrong: prove it (White to play).

sgf

Problem 3

White played F2 and Black descended, what is the best outcome? (White to play).

sgf

Problem 4

White to play and improve on F2

sgf

David Mitchell provides the solutions and discusses life and death generally in this video on our YouTube channel: