Edge template IV2m

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Red can connect the stone marked "1" to the bottom. There are infinitely many related templates, with the two red stones arbitrarily far apart, for example:


and so on. All of these templates work the same way: the stone "1" guarantees Red a second-row ladder, and the other red stone acts as a 2nd-to-4th row switchback, connecting to "1". The following is the best Blue can do (if Blue plays differently, Red will connect to the edge immediately):