Difference between revisions of "Bottleneck"

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(added two more bottlenecks)
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The '''bottleneck''' is a common [[Defense pattern|defense pattern]]. The board fragment below shows a position where the vertical player (red) wants to connect to the bottom, but is being hindered by blue in a bottleneck formation.
 
The '''bottleneck''' is a common [[Defense pattern|defense pattern]]. The board fragment below shows a position where the vertical player (red) wants to connect to the bottom, but is being hindered by blue in a bottleneck formation.
 
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<hexboard size="4x7"
[[Image:bottleneck.png]]
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  coords="none"
 
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  edges="bottom"
<!-- <hex>R5, C5, Vd1, Hb2, Vc2, Hd2, Hb4</hex>-->
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  visible="area(d1,a4,g4,g1)"
 
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  contents="R e1 e2 B d2 f2 d4"
The bottleneck formation invariably leads to a [[Ladder|ladder]] situation.
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  />
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The bottleneck formation invariably leads to a [[Ladder|ladder]] situation. Red gets ladders in both directions.
 +
<hexboard size="4x7"
 +
  coords="none"
 +
  edges="bottom"
 +
  visible="area(d1,a4,g4,g1)"
 +
  contents="R e1 e2 B d2 f2 d4 R 1:d3 B 2:c4 R 3:c3 B 4:b4 R 5:e3 B 6:e4 R 7:f3 B 8:f4"
 +
  />
  
 
== Bottlenecks with bridges ==
 
== Bottlenecks with bridges ==
  
<hex>R4, C4,  
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<hexboard size="4x8"
Hb1 Vc1 Hd1
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  coords="none"
 
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  edges="bottom"
 
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  visible="area(d1,a4,h4,h1)"
    Hb4</hex>
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  contents="R f1 B e1 g1 e4"
 
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  />
<hex>R4, C6,  
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<hexboard size="4x8"
    Vd1
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  coords="none"
Hb2      He2
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  edges="bottom"
 
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  visible="area(d1,a4,h4,h1)"
  Hb4</hex>
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  contents="R f1 B d2 g2 d4"
 +
  />
  
 
[[category:strategy]]
 
[[category:strategy]]

Revision as of 14:07, 9 December 2020

The bottleneck is a common defense pattern. The board fragment below shows a position where the vertical player (red) wants to connect to the bottom, but is being hindered by blue in a bottleneck formation.

The bottleneck formation invariably leads to a ladder situation. Red gets ladders in both directions.

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Bottlenecks with bridges