Under the Stones

A play under the stones (Japanese: ishi-no-shita) is a play in a space which has become free because some of your own stones have been captured, other than more common nakade and throw-in.

There are some spectacular tesuji where you plan to do this, losing stones deliberately, and carry that out unexpectedly.

Under the stones example.  

Under the stones can be found in some life and death problems. This one is taken from Beginner Exercise 55.

Under the stones example.  

Black can play at , sacrificing four black stones. Playing at 2 will not save the group.

Under the stones example.  

Even though captures four black stones, the magic of the under the stones tesuji is shown when recaptures two white stones to make the second eye and lives.

• Under The Stones Sacrifice Shape List
  • Sacrifice Shapes which lead to the Under The Stones Tesuji

Examples

• Example 1
• Example 2
• Three points without capturing and Five points without capturing
• In the 20th Meijin between Kobayashi Koichi and Takemiya Masaki this tesuji was threatened and enabled Takemiya to win a ko: http://gobase.org/games/japan/titles/meijin/20/game-3.sgf
• Alternative URL of above game (no login required): http://www.go4go.net/go/games/sgfview/9354
• https://www.nhk.or.jp/goshogi/igo/score.html?d=20100801 Murakawa Daisuke - Imamura Toshiya, NHK Cup 2010 (move 190-)
• Examples from real games: https://youtu.be/zuvUTHjSXao (Russian, by Alexander Dinerchtein)

Problems

• Under The Stones Problems
• BQM 1
• Snapback Problem 16
• Completely Artificial Problem
• Biggest Known Eye Space for which there is a Nakade

WikiMasterEdited by Dieter.