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Expert Advice
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Eye Spaces
Sometimes , you might think that black group surrounded by white stones in
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has two eyes . However , the two points making the eyes are not separated , so this is actually a two point eye space . Since it does not have two separated real eyes , the black group is dead , as shown in
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Not all groups with eye spaces are dead . Some are unconditionally alive , others are alive or dead depending on whose move ti is
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shows a black group with 3-point eye space . The life and death depends on whose move is it . If it is black turn , he lives by playing the marked stone in
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If it's white turns , then he kills black by placing a stone in the middle of the eye space, known as the placement move as shown in
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White plays as in the following diagram to prove black death in this case with the final result of black having only one eye .
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Another example of dead group is in
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If black play 1 , then white will play 2 which kills black . Then it implies that even if it's black turn that the black group is dead , then white will not need to kill it if it was his turn . Another example is in
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By playing 1 , the whole group of white is dead . The final shape of the eye will be reduced to 3 points space which is dead in white's turn . A very complicated example is
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In this case , there are a seven white stones in a row . Black 1 , also known as hane , reduce the eye space into 3 point space and finally kill it with 5 .
In conclusion , we have to play often to get used to the type of eye space and whether the eye is false or real . The method used here is to try to reduce opponent's space into known pattern that can be killed by techniques like hane and placement move (often used as a combo)
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shows a black group with a 4-point eye space . This group is alive as it stands . If white plays 1 in
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, then black responds by playing 2 and he has a real eye at the point to the right of 2 , and another 1-point eye to the left of 1 . White cannot play on either of these points without committing suicide .
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