Difference between revisions of "Edge template V1b"

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(Intrusion at x: Finished case x.)
(Intrusion at w: did part of case w)
Line 206: Line 206:
 
==== Intrusion at w ====
 
==== Intrusion at w ====
  
To do.
+
Red responds with
 +
 
 +
<hexboard size="6x14"
 +
  coords="hide"
 +
  edges="bottom"
 +
  visible="area(f1,a6,n6,n4,l2,h1)"
 +
  contents="R e2 d4 d3 B c3 d5 e3 c5 R 1:g3 B 2:g5 R 3:i4"
 +
  />
 +
 
 +
, ​ and defends the [[ziggurat]] from red3.
 +
 
 +
<hexboard size="6x14"
 +
  coords="hide"
 +
  edges="bottom"
 +
  visible="area(a6,f1,h1,h3,i2,i4,g6)"
 +
  contents="R e2 d4 d3 B c3 d5 e3 c5 R 1:g3 3:i4 h5 g6 B 2:g5"
 +
  />
 +
 
 +
Continuation:
 +
<div class="toccolours mw-collapsible  mw-collapsed">
 +
 
 +
Red's main threat is as follows.
 +
 
 +
<hexboard size="6x14"
 +
  coords="hide"
 +
  edges="bottom"
 +
  visible="area(a6,f1,h1,h3,i2,i4,g6)"
 +
  contents="R e2 d4 d3 B c3 d5 e3 c5 R 1:g3 3:i4 h5 g6 5:e4 B 2:g5 S d6 e6 e5 e4 f4 f3 h3 h4 i3"
 +
  />
 +
 
 +
 
 +
If Blue plays the upper-left shaded cell, then Red plays red5 anyway, after which Red connects via
 +
 
 +
<hexboard size="6x14"
 +
  coords="hide"
 +
  edges="bottom"
 +
  visible="area(a6,f1,h1,h3,i2,i4,g6)"
 +
  contents="R e2 d4 d3 B c3 d5 e3 c5 R 1:g3 3:i4 h5 g6 5:e4 7:f4 B 2:g5 4:f3 6:e5 6:d6 E *:f5 *:h3"
 +
  />
 +
 
 +
or
 +
 
 +
<hexboard size="6x14"
 +
  coords="hide"
 +
  edges="bottom"
 +
  visible="area(a6,f1,h1,h3,i2,i4,g6)"
 +
  contents="R e2 d4 d3 B c3 d5 e3 c5 R 1:g3 3:i4 h5 g6 5:e4 7:e5 9:f5 11:h3 B 2:g5 4:f3 6:e6 8:d6 10:f6"
 +
  />
 +
 
 +
.
 +
 
 +
 
 +
If Blue plays any of the other 3 leftmost shaded cells, then Red plays
 +
 
 +
<hexboard size="6x14"
 +
  coords="hide"
 +
  edges="bottom"
 +
  visible="area(a6,f1,h1,h3,i2,i4,g6)"
 +
  contents="R e2 d4 d3 B c3 d5 e3 c5 R 1:g3 3:i4 h5 g6 5:f2 B 2:g5 4:e4 4:e5 4:d6 E *:f5 *:h3"
 +
  />
 +
 
 +
, ​ connecting via one of the stars.
 +
 
 +
 
 +
If Blue plays the other shaded cell along the edge, then Red responds with
 +
 
 +
<hexboard size="6x14"
 +
  coords="hide"
 +
  edges="bottom"
 +
  visible="area(a6,f1,h1,h3,i2,i4,g6)"
 +
  contents="R e2 d4 d3 B c3 d5 e3 c5 R 1:g3 3:i4 h5 g6 5:h3 B 2:g5 4:e6"
 +
  />
 +
 
 +
, forcing Blue to defend towards the top, after which
 +
 
 +
<hexboard size="6x14"
 +
  coords="hide"
 +
  edges="bottom"
 +
  visible="area(a6,f1,h1,h3,i2,i4,g6)"
 +
  contents="R e2 d4 d3 B c3 d5 e3 c5 R 1:g3 3:i4 h5 g6 5:h3 7:e4 B 2:g5 4:e6 6:(f2 f3 g2)"
 +
  />
 +
 
 +
connects directly or via red1.
 +
 
 +
<hexboard size="6x14"
 +
  coords="hide"
 +
  edges="bottom"
 +
  visible="area(a6,f1,h1,h3,i2,i4,g6)"
 +
  contents="R e2 d4 d3 B c3 d5 e3 c5 R 1:g3 3:i4 h5 g6 5:h3 7:e4 9:e5 11:f5 B 2:g5 4:e6 6:(f2 f3 g2) 8:f4 10:d6"
 +
  />
 +
 
 +
 
 +
If Blue plays the middle shaded cell, then Red
 +
 
 +
<b>to be completed</b>
 +
</div>
  
 
==== Intrusion at x ====
 
==== Intrusion at x ====

Revision as of 09:59, 25 July 2022

Edge template V1b is a 5th row edge template with 1 stone.

The validity and minimality of this template has been checked by computer. The template was mentioned on 2016-05-19 by the user shalev in this Little Golem thread, but likely predates that post.


Defense against intrusions

Reduction

Red has 3 main threats. Using the ziggurat:

Using edge template III1b:

And using edge_template_IV1d:

For a blocking attempt, Blue must play in the overlap:

abc

Intrusion at a

If Blue intrudes at a, Red can start by forcing a 3rd or 2nd row ladder like this

21435

or like this:

214368579

Red's continuation will be discussed below.

Intrusion at b

If Blue intrudes at b, Red can start by forcing a 3rd row ladder like this:

43251

Red's continuation will be discussed below.

Intrusion at c

If Blue intrudes at c, Red can start by forcing a 2nd row ladder like this:

4325671

Red's continuation will be discussed below.

Continuation after 3rd row ladder

If Red achieved a 3rd row ladder after intrusions a or b as shown above, Red continues as follows.

1

Now Red is connected by Tom's move for 3rd and 5th row parallel ladders.

Continuation:

Now Red has two main threats. Via a ziggurat:

1

And via edge template IV2b:

1

Blue must play in the overlap:

pqr1stuvwxyz


Intrusion at p, q, r

22213

Now Blue must play in one of the 3 shaded cells. ​If Blue plays in the left 2 of those 3, then Red connects via IV-2-b. ​ Otherwise, Red connects via Tom's move.

22213957648

Intrusion at s

312

Red is connected by edge template IV1d.

Intrusion at t

51324

Now Red is connected by edge template V2m. If Blue plays 4 on the first row instead, Red connects by Tom's move:

132957648

Intrusion at u

1327546

Red is connected by Tom's move.

Intrusion at v

132

Red is connected by double threat.

Intrusion at w

Red responds with

132

, ​ and defends the ziggurat from red3.

132

Continuation:

Red's main threat is as follows.

1532


If Blue plays the upper-left shaded cell, then Red plays red5 anyway, after which Red connects via

41573626

or

4111537928610

.


If Blue plays any of the other 3 leftmost shaded cells, then Red plays

5143424

, ​ connecting via one of the stars.


If Blue plays the other shaded cell along the edge, then Red responds with

15324

, forcing Blue to defend towards the top, after which

666157324

connects directly or via red1.

666157839112104


If Blue plays the middle shaded cell, then Red

to be completed

Intrusion at x

Red can respond here:

132

Continuation:

Red has several threats. Via double threats:

Via double threat and edge template III2b:

Via bridges and Tom's move:

Via a wheel and Tom's move:

Via a double threat and Tom's move:

Via a different double threat and Tom's move:


Blue must play in the overlap:

rt

If Blue plays at r:

12

And then, depending on Blue's next move, either a crescent

124365

or Tom's move:

126453

If Blue plays at t:

21abc

If Blue plays at b or c, Red plays at a and connects via Tom's move. If Blue plays at a:

4213

Now Red is connected left by double threat, and right by a clipped version of edge template V2m.

Intrusion at y

51432

Note that the hexes marked "*" are captured by Red 3, so Blue 4 is forced. Then Red is connected by edge template IV2e.

Intrusion at z

51432

Note that the hexes marked "*" are captured by Red 3, so Blue 4 is forced. Then Red is connected by edge template IV2p.

Continuation after 2nd row ladder

If Red achieved a 2nd row ladder after intrusions a or c above, Red continues as follows.

312

Now Red connects in essentially the same way as Tom's move.

Continuation:

Red has these threats:

13524
132
1

The overlap in which Blue must play is:

Four of these five possible moves can be analysed together. In the following diagram, assume Blue has played 1 in any one of the cells marked with +:

64532

After Red 2, that group is safely connected to them bottom, now matter which of the pluses Blue chose before.

That leaves only one Blue move to deal with:

76108495213

Note that Red 4 connects to the bottom with IV-2-b.