HOW TO USE THIS WEB SITE: This web site is divided into 21 main sites as represented by the twenty one yellow buttons on the top of each page. The user can surf from one main site to another using these bottons. Within each main site use the vertical navigation bar on the left hand side to navigate from one page to another. Use the search command on the upper left to find what you are looking for.
Stones that can be captured are dead; Stones that cannot be captured are alive. White cannot simultaneously play at both a and b. Therefore black is alive. Beware of false eyes; white can capture at c before capturing the entire black group at d.
In some situations, neither side is willing to fill in (e.g., at e and f). Both sides are alive, known as a seki (co-existence).