torazu sanmoku
Torazu sanmoku = Three points without capturing.
The traditional Japanese ruling (by Honinbo Shuwa, according to the Esperanto link below) was that this corner position was worth 3 points for Black at the end, without his having to capture the marked white stones. The Japanese '89 rules make this seki if it is left on the board at the end of the game.
See http://jega.hp.infoseek.co.jp/terminaro/esp_tekn_S-.htm
for an Esperanto explanation.
Mathematical Go defends the 3-point ruling in terms of combinatorial game theory. See derivation.
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