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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Eye by exhaustion
This example is a sample problem from the Korean Problem Academy (on Gobase). Black to live.
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.
![[Diagram]](../../diagrams/15/2e28456716d09413c409f33f1ff616de.png)
Even if self-capture is legal... (5 at 4, 7 at 6)
Even if self-capture is legal, such as when using Ing's rules, Black still lives. Because when
makes a self-capture, it is Black's turn and Black can now play
at
. Similarly,
is answered at
.
Why other methods fail
is a mistake. After
, the chain containing
has two liberties, and the atari at a and b are miai. Black is dead.
Issue of ko-threats
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.
![[Diagram]](../../diagrams/19/17e36c6b5cbf2fc08e023304aaf492bb.png)
![[Diagram]](../../diagrams/13/32c21deeb6885357ce63a1a4977e6842.png)
![[Diagram]](../../diagrams/20/9caabbd28665161753bfaa06abd7a425.png)
![[Diagram]](../../diagrams/9/ad3c673b542e0fc65703990800c9543f.png)
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