Chinese Go terms: 要子 and 废子

101weiqi.com now has the possibility to subscribe via PayPal instead of only the previous Chinese payment options, so I now got a subscription and I am doing the workbooks, but I cannot really figure out what the following Chinese Go terms mean 要子 and 废子 (the problems themselves under this heading are more or less clear but I wonder what is the international term)

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From Chinese Go Terms at Sensei's Library

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I agree with this assessment.

要 means need, main point, essence, pivot, or key (to).

廢 means abrogate, terminate, or discard.

So these terms can be understood to represent necessary stones and discardable stones, respectively.

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That make sense since the puzzels with that title on 101weiqi were all about choosing which group to save and which to sacrifice

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The very common meaning of yao is simply the verb “to want”.
Which is in line with what is said already.

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