Difference between revisions of "Edge template IV2j"
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| − | + | Template IV2-j is a 4th row [[edge template]] with 2 stones. | |
| − | <hexboard size=" | + | <hexboard size="4x4" |
| − | coords="hide" | + | coords="hide" |
| − | + | edges="bottom" | |
| + | visible="-(a1 a2 a3 b1)" | ||
| + | contents="R ↑:d1 b2" | ||
/> | /> | ||
| + | Red can connect the stone marked "↑" to the edge. Red cannot guarantee to connect the other stone. | ||
| + | |||
(From: [http://www.drking.org.uk/hexagons/hex/templates.html www.drking.org.uk]) | (From: [http://www.drking.org.uk/hexagons/hex/templates.html www.drking.org.uk]) | ||
| + | |||
| + | == Defending the template == | ||
Red has two threats: | Red has two threats: | ||
| − | <hexboard size=" | + | <hexboard size="4x4" |
| − | coords="hide" | + | coords="hide" |
| − | + | edges="bottom" | |
| + | visible="-(a1 a2 a3 b1)" | ||
| + | contents="E +:c1 R ↑:d1 R b2 E +:c2 E +:b3 R A:b3 E +:a4 E +:b4 " | ||
/> | /> | ||
and | and | ||
| − | <hexboard size=" | + | <hexboard size="4x4" |
| − | coords="hide" | + | coords="hide" |
| − | + | edges="bottom" | |
| + | visible="-(a1 a2 a3 b1)" | ||
| + | contents="R ↑:d1 R b2 E +:c2 E +:d2 R B:c3 E +:b4 E +:c4" | ||
/> | /> | ||
To attempt blocking, Blue must play in one of the two cells where these threats overlap. If Blue plays in upper one of these cells, Red responds as follows: | To attempt blocking, Blue must play in one of the two cells where these threats overlap. If Blue plays in upper one of these cells, Red responds as follows: | ||
| − | <hexboard size=" | + | <hexboard size="4x4" |
| − | coords="hide" | + | coords="hide" |
| − | + | edges="bottom" | |
| + | visible="-(a1 a2 a3 b1)" | ||
| + | contents="R ↑:d1 b2 2:d2 4:b3 B 1:c2 3:c4 E +:c1 +:c3" | ||
/> | /> | ||
Red 4 is connected to the bottom and also to the top by one of the two fields marked "+". | Red 4 is connected to the bottom and also to the top by one of the two fields marked "+". | ||
If Blue plays in the other overlap, Red responds as follows: | If Blue plays in the other overlap, Red responds as follows: | ||
| − | <hexboard size=" | + | <hexboard size="4x4" |
| − | coords="hide" | + | coords="hide" |
| − | + | edges="bottom" | |
| + | visible="-(a1 a2 a3 b1)" | ||
| + | contents="R ↑:d1 b2 2:d3 4:b3 B 1:b4 3:d2" | ||
/> | /> | ||
| + | |||
| + | == Cutting off the other stone == | ||
| + | |||
| + | As mentioned, this does not give a connection down for the left stone. If Red keeps the right stone | ||
| + | |||
| + | <hexboard size="4x4" | ||
| + | coords="hide" | ||
| + | edges="bottom" | ||
| + | visible="-(a1 a2 a3 b1)" | ||
| + | contents="R ↑:d1 b2 2:c3 4:d2 B 1:b3 3:c2 5:c1" | ||
| + | /> | ||
| + | |||
| + | connected down within the template, then the sequence of Blue cutting off the left stone is shown above. | ||
== See also == | == See also == | ||
Latest revision as of 02:05, 22 September 2021
Template IV2-j is a 4th row edge template with 2 stones.
Red can connect the stone marked "↑" to the edge. Red cannot guarantee to connect the other stone.
(From: www.drking.org.uk)
Defending the template
Red has two threats:
and
To attempt blocking, Blue must play in one of the two cells where these threats overlap. If Blue plays in upper one of these cells, Red responds as follows:
Red 4 is connected to the bottom and also to the top by one of the two fields marked "+".
If Blue plays in the other overlap, Red responds as follows:
Cutting off the other stone
As mentioned, this does not give a connection down for the left stone. If Red keeps the right stone
connected down within the template, then the sequence of Blue cutting off the left stone is shown above.
