Eye by Exhaustion
Eye by exhaustion is a term coined by Tamsin that describes an eye-making technique. Here, an eye is formed because the required throw-in move required to falsify this eye turned out to be a suicide move.
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After and , Black makes two eyes and lives because the existence of the stones make both a and b suicide moves, which is illegal in some rulesets. In Tamsin's terms, the White stones are too "exhausted" to go one step further.
Although there is no difference in the status of the groups with "eyes by exhaustion" when different rulesets are applied, there is a difference where ko-threats are concerned. Here, White has a (loss-making) ko-threat at a if self-capture is allowed, but White has none otherwise.