I'm really new to Go (just started learn last week). I'm a little confused about the terminology "played at ". What does that mean? I guess that is same as the numbered black stone, but what does "at " mean?
Confused: It's a convenient shorthand for describing simple variations of a diagram. at means, the situation if Black would have played the second move () at the location of the White stone at . Here Karl Knechtel was writing about the following case.
Jasonred (I think) wrote:
This is one of the reasons, why I avoid throwing around Japanese terms I don't understand completly or for which there is a good English translation. Some of those concepts are complicated enough on their own, that I don't need to confuse the matter more with the wrong Japanese names.
It's a throw-in
 A black play at a is safe from that, as I'd originally thought, but I managed to confuse myself somehow. Thanks SAS. :) Anyway - see Ko threat exercise 3 for more information about that sort of tradeoff.