View source for Template VI1/Intrusion on the 4th row

This page is devoted to details on how to [[Defending against intrusions in template VI1|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.

<hex>
R7 C14 Q0
1:BBBBBBBBBRBBBBB
Sa2 Sb2 Sc2 Sd2 Se2 Sf2 Sg2 Sh2 Rj2 Sl2 Sm2 Sn2 
Sa3 Sb3 Sc3 Sd3 Se3 Sf3 Sm3 Sn3
Sa4 Sb4 Sc4 Sd4 Sn4
Sa5 Sb5
Sa6

Bi4 
</hex>

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

<hex>
R7 C14 Q0
1:BBBBBBBBBRBBBBB
Sa2 Sb2 Sc2 Sd2 Se2 Sf2 Sg2 Sh2 Rj2 Sl2 Sm2 Sn2 
Sa3 Sb3 Sc3 Sd3 Se3 Sf3 Sm3 Sn3
Sa4 Sb4 Sc4 Sd4 Sn4
Sa5 Sb5
Sa6

Bi4 Rh3 Pk3
</hex>

== Elimination of irrelevant Blue moves ==
This gives Red several immediate threats:
From III1a:
<hex>
R7 C14 Q0
1:BBBBBBBBBRBBBBB
Sa2 Sb2 Sc2 Sd2 Se2 Sf2 Sg2 Sh2 Rj2 Sl2 Sm2 Sn2 
Sa3 Sb3 Sc3 Sd3 Se3 Sf3 Sm3 Sn3
Sa4 Sb4 Sc4 Sd4 Sn4
Sa5 Sb5
Sa6

Bi4 Rh3
Rg5
Pg4 Ph4
Ph5
Pf6 Pg6 Ph6
Pe7 Pf7 Pg7 Ph7
</hex>

From III1a again:
<hex>
R7 C14 Q0
1:BBBBBBBBBRBBBBB
Sa2 Sb2 Sc2 Sd2 Se2 Sf2 Sg2 Sh2 Rj2 Sl2 Sm2 Sn2 
Sa3 Sb3 Sc3 Sd3 Se3 Sf3 Sm3 Sn3
Sa4 Sb4 Sc4 Sd4 Sn4
Sa5 Sb5
Sa6

Bi4 Rh3
Rg5
Pg4 Ph4
Pf5
Pe6 Pf6 Pg6
Pd7 Pe7 Pf7 Pg7 
</hex>

From III1b :
<hex>
R7 C14 Q0
1:BBBBBBBBBRBBBBB
Sa2 Sb2 Sc2 Sd2 Se2 Sf2 Sg2 Sh2 Rj2 Sl2 Sm2 Sn2 
Sa3 Sb3 Sc3 Sd3 Se3 Sf3 Sm3 Sn3
Sa4 Sb4 Sc4 Sd4 Sn4
Sa5 Sb5
Sa6

Bi4 Rh3
Rg5
Pg4 Ph4
Pf5 Ph5
Pe6 Pf6 Pg6 Ph6
Pd7 Pe7 Pg7 Ph7 
</hex>

From IV1a:
<hex>
R7 C14 Q0
1:BBBBBBBBBRBBBBB
Sa2 Sb2 Sc2 Sd2 Se2 Sf2 Sg2 Sh2 Rj2 Sl2 Sm2 Sn2 
Sa3 Sb3 Sc3 Sd3 Se3 Sf3 Sm3 Sn3
Sa4 Sb4 Sc4 Sd4 Sn4
Sa5 Sb5
Sa6

Bi4 Rh3
Rg4
Pf4
Pd5 Pe5 Pf5 Pg5 Ph5
Pc6 Pd6 Pe6 Pf6 Pg6 Ph6
Pb7 Pc7 Pd7 Pe7 Pf7 Pg7 Ph7
</hex>

From IV1b:
<hex>
R7 C14 Q0
1:BBBBBBBBBRBBBBB
Sa2 Sb2 Sc2 Sd2 Se2 Sf2 Sg2 Sh2 Rj2 Sl2 Sm2 Sn2 
Sa3 Sb3 Sc3 Sd3 Se3 Sf3 Sm3 Sn3
Sa4 Sb4 Sc4 Sd4 Sn4
Sa5 Sb5
Sa6

Bi4 Rh3
Rg4
Pf4 Ph4
Pd5 Pe5 Pf5 Pg5 Ph5 Pi5
Pc6 Pd6 Pe6     Pg6 Ph6 Pi6
Pb7 Pc7 Pd7 Pe7 Pf7 Pg7 Ph7 Pi7
</hex>

The intersection of all of these leaves: 
<hex>
R7 C14 Q1
1:BBBBBBBBBRBBBBB
Sa2 Sb2 Sc2 Sd2 Se2 Sf2 Sg2 Sh2 Rj2 Sl2 Sm2 Sn2 
Sa3 Sb3 Sc3 Sd3 Se3 Sf3 Sm3 Sn3
Sa4 Sb4 Sc4 Sd4 Sn4
Sa5 Sb5
Sa6

Bi4 Rh3
 Pg4
  Pg5
   Pg6 
Pe7 Pg7 
</hex>

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

=== Bg4 ===
<hex>
R7 C14 Q0
1:BBBBBBBBBRBBBBB
Sa2 Sb2 Sc2 Sd2 Se2 Sf2 Sg2 Sh2 Rj2 Sl2 Sm2 Sn2 
Sa3 Sb3 Sc3 Sd3 Se3 Sf3 Sm3 Sn3
Sa4 Sb4 Sc4 Sd4 Sn4
Sa5 Sb5
Sa6

Bi4 Rh3 

N:on Bg4 Rh4 Bg6 Rh5
</hex>
And now either
<hex>
R7 C14 Q0
1:BBBBBBBBBRBBBBB
Sa2 Sb2 Sc2 Sd2 Se2 Sf2 Sg2 Sh2 Rj2 Sl2 Sm2 Sn2 
Sa3 Sb3 Sc3 Sd3 Se3 Sf3 Sm3 Sn3
Sa4 Sb4 Sc4 Sd4 Sn4
Sa5 Sb5
Sa6

Bi4 Rh3 

Bg4 Rh4 Bg6 Rh5
N:on Bh6 Rj5
Pk3 Pi5
</hex>

or

<hex>
R7 C14 Q0
1:BBBBBBBBBRBBBBB
Sa2 Sb2 Sc2 Sd2 Se2 Sf2 Sg2 Sh2 Rj2 Sl2 Sm2 Sn2 
Sa3 Sb3 Sc3 Sd3 Se3 Sf3 Sm3 Sn3
Sa4 Sb4 Sc4 Sd4 Sn4
Sa5 Sb5
Sa6

Bi4 Rh3 

Bg4 Rh4 Bg6 Rh5
N:on Bh7 Rh6 Bg7 Rj6 Bi6 Rj5
Pk3 Pi5
</hex>

=== Bg5 ===
<hex>
R7 C14 Q1
1:BBBBBBBBBRBBBBB
Sa2 Sb2 Sc2 Sd2 Se2 Sf2 Sg2 Sh2 Rj2 Sl2 Sm2 Sn2 
Sa3 Sb3 Sc3 Sd3 Se3 Sf3 Sm3 Sn3
Sa4 Sb4 Sc4 Sd4 Sn4
Sa5 Sb5
Sa6

Bi4 Rh3 

N:on Bg5 Rf4
</hex>
Threatening:
<hex>
R7 C14 Q1
1:BBBBBBBBBRBBBBB
Sa2 Sb2 Sc2 Sd2 Se2 Sf2 Sg2 Sh2 Rj2 Sl2 Sm2 Sn2 
Sa3 Sb3 Sc3 Sd3 Se3 Sf3 Sm3 Sn3
Sa4 Sb4 Sc4 Sd4 Sn4
Sa5 Sb5
Sa6

Bi4 Rh3 
Bg5 Rf4
             Pe4
      Pc5 R4d5 Pe5
   Pb6 Pc6 Pd6
Pa7 Pb7 Pc7 Pd7
</hex>
<hex>
R7 C14 Q1
1:BBBBBBBBBRBBBBB
Sa2 Sb2 Sc2 Sd2 Se2 Sf2 Sg2 Sh2 Rj2 Sl2 Sm2 Sn2 
Sa3 Sb3 Sc3 Sd3 Se3 Sf3 Sm3 Sn3
Sa4 Sb4 Sc4 Sd4 Sn4
Sa5 Sb5
Sa6

Bi4 Rh3 
Bg5 Rf4
      Pe5 Pf5
       R4e6
    Pd7 Pe7
</hex>

<hex>
R7 C14 Q1
1:BBBBBBBBBRBBBBB
Sa2 Sb2 Sc2 Sd2 Se2 Sf2 Sg2 Sh2 Rj2 Sl2 Sm2 Sn2 
Sa3 Sb3 Sc3 Sd3 Se3 Sf3 Sm3 Sn3
Sa4 Sb4 Sc4 Sd4 Sn4
Sa5 Sb5
Sa6

Bi4 Rh3 
Bg5 Rf4
      Pd5 R4e5 Pf5
   Pc6 Pd6 Pe6 Pf6
Pb7 Pc7     Pe7 Pf7
</hex>
So the only hope for Blue lies in the intersection of the threats, Be5, but it is unsufficient:

<hex>
R7 C14 Q1
1:BBBBBBBBBRBBBBB
Sa2 Sb2 Sc2 Sd2 Se2 Sf2 Sg2 Sh2 Rj2 Sl2 Sm2 Sn2 
Sa3 Sb3 Sc3 Sd3 Se3 Sf3 Sm3 Sn3
Sa4 Sb4 Sc4 Sd4 Sn4
Sa5 Sb5
Sa6

Bi4 Rh3 
Bg5 Rf4
N:on Be5 Rf5 Be7 Rf6 Bf7 Rg6 Bg7 Rj5
Pk3 Pi5
</hex>
=== Bg6 ===
<hex>
R7 C14 Q0
1:BBBBBBBBBRBBBBB
Sa2 Sb2 Sc2 Sd2 Se2 Sf2 Sg2 Sh2 Rj2 Sl2 Sm2 Sn2 
Sa3 Sb3 Sc3 Sd3 Se3 Sf3 Sm3 Sn3
Sa4 Sb4 Sc4 Sd4 Sn4
Sa5 Sb5
Sa6

Bi4 Rh3 

N:on Bg6 Rg5 Bf6 Rh5
Pe7
</hex>

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

<hex>
R7 C14 Q0
1:BBBBBBBBBRBBBBB
Sa2 Sb2 Sc2 Sd2 Se2 Sf2 Sg2 Sh2 Rj2 Sl2 Sm2 Sn2 
Sa3 Sb3 Sc3 Sd3 Se3 Sf3 Sm3 Sn3
Sa4 Sb4 Sc4 Sd4 Sn4
Sa5 Sb5
Sa6

Bi4 Rh3 

Bg6 Rg5 Bf6 Rh5
N:on Bh6 Rj5
Pi5 Pk3
</hex>

or

<hex>
R7 C14 Q0
1:BBBBBBBBBRBBBBB
Sa2 Sb2 Sc2 Sd2 Se2 Sf2 Sg2 Sh2 Rj2 Sl2 Sm2 Sn2 
Sa3 Sb3 Sc3 Sd3 Se3 Sf3 Sm3 Sn3
Sa4 Sb4 Sc4 Sd4 Sn4
Sa5 Sb5
Sa6

Bi4 Rh3 

Bg6 Rg5 Bf6 Rh5
N:on Bh7 Rh6 Bg7 Rj6 Bi6 Rj5
Pk3 Pi5
</hex>

=== Be7 ===
Either this
<hex>
R7 C14 Q0
1:BBBBBBBBBRBBBBB
Sa2 Sb2 Sc2 Sd2 Se2 Sf2 Sg2 Sh2 Rj2 Sl2 Sm2 Sn2 
Sa3 Sb3 Sc3 Sd3 Se3 Sf3 Sm3 Sn3
Sa4 Sb4 Sc4 Sd4 Sn4
Sa5 Sb5
Sa6

Bi4 Rh3 

N:on Be7 Rg5 Bg6 Rh5 Bh6 Rj5
Pi5 Pk3

</hex>

or a minor variation

<hex>
R7 C14 Q0
1:BBBBBBBBBRBBBBB
Sa2 Sb2 Sc2 Sd2 Se2 Sf2 Sg2 Sh2 Rj2 Sl2 Sm2 Sn2 
Sa3 Sb3 Sc3 Sd3 Se3 Sf3 Sm3 Sn3
Sa4 Sb4 Sc4 Sd4 Sn4
Sa5 Sb5
Sa6

Bi4 Rh3 

N:on Be7 Rg5 Bg6 Rh5 Bh7 Rh6 Bg7 Rj6 Bi6 Rj5
Pi5 Pk3

</hex>

=== Bg7 ===

<hex>
R7 C14 Q0
1:BBBBBBBBBRBBBBB
Sa2 Sb2 Sc2 Sd2 Se2 Sf2 Sg2 Sh2 Rj2 Sl2 Sm2 Sn2 
Sa3 Sb3 Sc3 Sd3 Se3 Sf3 Sm3 Sn3
Sa4 Sb4 Sc4 Sd4 Sn4
Sa5 Sb5
Sa6

Bi4 Rh3 

N:on Bg7 Rg5 Bf6 Rh6 Bh7 Rj6 Bi6 Rj5
Pi5 Pk3

</hex>

[[category:edge templates]]