Template VI1/Intrusion on the 4th row

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This page is devoted to details on how to defend against intrusions in template VI. This page explores what are the possibilities for Red to defend the template when Blue intrude on the 4th row.

Red should move here (or the equivalent mirror-image move at "+"):

Elimination of irrelevant Blue moves

This gives Red several immediate threats: From III1a:

From III1a again:

From III1b :

From IV1a:

From IV1b:

The intersection of all of these leaves:

abcdefghijklmn234567

Specific defense

So we must deal with each of these responses. (Which will not be too hard!)

Bg4

1243

And now either

21

or

625431

Bg5

abcdefghijklmn23456721

Threatening:

abcdefghijklmn2345674
abcdefghijklmn2345674
abcdefghijklmn2345674

So the only hope for Blue lies in the intersection of the threats, Be5, but it is unsufficient:

abcdefghijklmn23456712846357

Bg6

2431

3 could be played at + with the same effect; in any case now either

21

or

625431

Be7

Either this

246351

or a minor variation

24103698175

Bg7

28347615