Eye liberties
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A group involved in a capturing race can have an eye. The liberties provided by that eye are called eye liberties. Here, "liberties" is used in its capture metric liberty meaning.
Small eyes (one to three points) have as many eye liberties as their number of empty spaces, less the number of opponent stones inside. See small eye liberties.
Big eyes (four to seven points) have more eye liberties than their number of empty spaces. See big eye liberties.
The player who knows the sequence for liberties as a function of eye size (1, 2, 3, 5, 8, 12, 17) has an advantage over a player who has to read the capturing race. The general formula is
L(n) = (n^2-3n)/2 + 3
for 2 <= eye size n <= 7. Subtract the enemy stones inside to determine the number of eye liberties remaining.
All pages related to eyes are in the Eyes Collection.
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