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Vital point method with one point eyes
Difficulty: Intermediate
Keywords: Life & Death
Here is an attempt for a systematic approach for finding the vital point, if your eye isn't trained to see it on the spot.
This position is taken from Kanazawa Problem 25. White to live. Let's try to make a one-point eye with as few moves as possible.
Adding two stones.
Adding two stones.
Adding three stones.
Adding three stones.
Looking back at the reference diagram, points a and b occur in three of the four diagrams. Both are vital points, but a is more valuable than b, because a occurs in both diagrams with two stones. This reasoning can easily be quantified. Conclusion: a is the vital point. This is a copy of the living page "Vital point method with one point eyes" at Sensei's Library. ![]() |