On this page I show some local situations where beginners very commonly make mistakes. Most of these are undoubtedly described elsewhere on SL as well; this is just my personal collection. They are loosely in order of difficulty.
(known as the Chapel)
But see also the Two Stone Edge Squeeze for a counterexample of where this can be very useful.
Many variations on this, here are a few:
The three diagonal stones ( and ) are now very weak, and they are easily cut, often leading to double ataris and other nastiness.
protects against the cut at both a and b!
Warp: Note however, that the double hane, resulting in something very similar to this, is not always wrong. For instance, some josekis use it (offering one stone as sacrifice in this way can have beneficial consequences in another place).
Also note that while nicely protects both cutting points, it leaves two possible peeps which, if both are answered, can make the shape quite overconcentrated.
(see also Grotto)
Black's dead group in the corner desperately wants to escape and connect with the live group on the right. Black realizes that white cannot Hane to cut him off, so he plans to continue crawling on the 1st line until a connection is made. Unfortunately...
After the Net, black cannot connect.
The player crawling on the 1st line for escape can be given as much rope as is necessary to hang themselves with, once they finally see the Net at the end.