DietersMistakesIn2021/Solution17

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Mistake 17

W1 is best. Due to Black's previous mistake at black+circle, the corner is overconcentrated and White's stones there are disposable. White gets sente to continue on the lower side and can play 'a' next.

If white plays at 'a' instead of W1, then black will reply at B2. Instead, defending with W1 at 'c' is too passive: black is happy to reply at either W1 or 'd'.


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