Editing Go (game) (section)

=== Reading ahead ===
One of the most important skills required for strong tactical play is the ability to read ahead.{{sfn|Davies|1995|p=5}} Reading ahead includes considering available moves to play, the possible responses to each move, and the subsequent possibilities after each of those responses. Some of the strongest players of the game can read up to 40 moves ahead even in complicated positions.<ref name=TreasureChest>{{citation | chapter = Memories of Kitani | title = The Treasure Chest Enigma | last = Nakayama | first = Noriyuki | publisher = Slate & Shell | year = 1984 | isbn = 978-1-932001-27-3 | pages =16–19}}</ref>

As explained in the scoring rules, some stone formations can never be captured and are said to be alive, while other stones may be in a position where they cannot avoid being captured and are said to be dead. Much of the practice material available to players of the game comes in the form of life and death problems, also known as [[tsumego]].<ref name=Tsumego>{{Citation | url = http://www.yomiuri.co.jp/dy/columns/0001/305.htm | last = van Zeijst | first = Rob | publisher = [[Yomiuri Shimbun]] | title = Whenever a player asks a top professional&nbsp;... | access-date = 2008-06-09 | archive-date = 2008-05-11 | archive-url = https://web.archive.org/web/20080511122600/http://www.yomiuri.co.jp/dy/columns/0001/305.htm | url-status = dead}}</ref> In such problems, players are challenged to find the vital move sequence that kills a group of the opponent or saves a group of their own. Tsumego are considered an excellent way to train a player's ability at reading ahead,<ref name=Tsumego /> and are available for all skill levels, some posing a challenge even to top players.