Difference between revisions of "Ladder escape fork"

From HexWiki
Jump to: navigation, search
m (inner link : forking move -> multiple threat)
(transformed the stub article into a better looking one. added one commented basic example. added cats)
Line 1: Line 1:
 
A [[Multiple threat|forking move]] which creates a [[ladder escape]].
 
A [[Multiple threat|forking move]] which creates a [[ladder escape]].
 +
== Example ==
  
{{stub}}
+
In the following position, Red has no [[edge template]].
 +
<hex>R7 C7 Q1 
 +
 
 +
Va2 Hb2              Vf2 Vg2
 +
  Va3    Hc3
 +
  Va4            He4
 +
    Va5 Hb5    Hd5
 +
                            Hg6
 +
     
 +
</hex>
 +
 
 +
The only option seems to be a [[ladder]].
 +
<hex>R7 C7 Q1 
 +
 
 +
Va2 Hb2              Vf2 Vg2
 +
  Va3    Hc3
 +
  Va4            He4
 +
    Va5 Hb5    Hd5
 +
    V1a6 V3b6                Hg6
 +
      H2a7 H4b7
 +
</hex>
 +
 
 +
However, pushing too much the ladder is useless, and it actually enables Blue to win.
 +
 
 +
<hex>R7 C7 Q1 
 +
 
 +
Va2 Hb2              Vf2 Vg2
 +
  Va3    Hc3
 +
  Va4            He4
 +
    Va5 Hb5    Hd5
 +
    Va6 Vb6 V1c6 V3d6 V5e6 Sf6 Hg6
 +
      Ha7 Hb7 H2c7 H4d7 H6e7 Sf7
 +
</hex>
 +
 
 +
Red needs the two pieces at the top right hand-corner of the board. Red pushes the ladder just enough to use a '''ladder escape fork'''. This pivot piece threatens to connect to the top group and acts as a [[ladder escape]] as well.
 +
 
 +
<hex>R7 C7 Q1 
 +
 
 +
Va2 Hb2              Vf2 Vg2
 +
  Va3    Hc3
 +
  Va4            He4 Sf4
 +
    Va5 Hb5    Hd5
 +
    Va6 Vb6 V1c6 Sd6 V3e6      Hg6
 +
      Ha7 Hb7 H2c7
 +
</hex>
 +
 
 +
== See also ==
 +
 
 +
[[Foiling ladder escapes]]
 +
 
 +
[[category:ladder]]
 +
[[category:intermediate Strategy]]

Revision as of 00:14, 1 November 2008

A forking move which creates a ladder escape.

Example

In the following position, Red has no edge template.

abcdefg1234567

The only option seems to be a ladder.

abcdefg12345671324

However, pushing too much the ladder is useless, and it actually enables Blue to win.

abcdefg1234567135246

Red needs the two pieces at the top right hand-corner of the board. Red pushes the ladder just enough to use a ladder escape fork. This pivot piece threatens to connect to the top group and acts as a ladder escape as well.

abcdefg1234567132

See also

Foiling ladder escapes