Difference between revisions of "Ladder escape"

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(Added first example of alternate ladder escape)
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In general, for a ladder escape to be successful, it should be safely connected to the edge and not [[interfering patterns|interfere]] with the ladder's projected path.
 
In general, for a ladder escape to be successful, it should be safely connected to the edge and not [[interfering patterns|interfere]] with the ladder's projected path.
  
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However, it is not '''necessary''' to have an escape piece on the projected path of the ladder in order to escape it.
  
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=== Third Row Example ===
  
To escape a ladder, it is not necessary to have an escape piece on the projected path of the ladder.
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In this example, Red has no third row ladder escape piece.  Red 1 provides an escape by threatening to connect to the main group.
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<hexboard size="13x13"
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  contents="R i2 B j2 R m2 B g3 B i3 R k3 R g4 B h4 R i4 R h5 B j5 B f7 R g7 B e8 R f8 R e9 B f9 B c10 R d10 B e10 R b11 B c11 R d11 R e11 R 1:g11 R b12 B c12 B d12 B e12"
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  />
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After the sequence to Red 3, Blue cannot stop both of Red's non-overlapping connections.
 +
<hexboard size="13x13"
 +
  contents="R i2 B j2 R m2 B g3 B i3 R k3 R g4 B h4 R i4 R h5 B j5 B f7 R g7 B e8 R f8 E *:h8 R e9 B f9 B c10 R d10 B e10 E *:f10 R 3:g10 R b11 B c11 R d11 R e11 B 2:f11 R 1:g11 R b12 B c12 B d12 B e12"
 +
  />
  
In the example below, Red 1 threatens to connect to the group above as a means of outrunning Blue's ladder.
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=== Second Row Example ===
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In the example below, Red 1 threatens to connect to the main group as a means of outrunning Blue's second row ladder.
 
<hexboard size="13x13"
 
<hexboard size="13x13"
 
   contents="R i2 B j2 R m2 B g3 B i3 R k3 R g4 B h4 R i4 R h5 B j5 B f7 R g7 B e8 R f8 R e9 B f9 R d10 B e10 R c11 B d11 R 1:h11 R c12 R d12 R e12 B b13 B c13 B d13 B e13"
 
   contents="R i2 B j2 R m2 B g3 B i3 R k3 R g4 B h4 R i4 R h5 B j5 B f7 R g7 B e8 R f8 R e9 B f9 R d10 B e10 R c11 B d11 R 1:h11 R c12 R d12 R e12 B b13 B c13 B d13 B e13"

Revision as of 03:02, 21 September 2015

In the ladder situation below, the piece h8 is a ladder escape, or an escape piece.

abcdefghi123456789

It allows Red (the attacking player) to jump a move ahead of the ladder and win the game. Red can play along the ladder, forcing Blue's response at each step. After move 9 at g8, Red is connected to the bottom.

abcdefghi123456789135792468

In general, for a ladder escape to be successful, it should be safely connected to the edge and not interfere with the ladder's projected path.

However, it is not necessary to have an escape piece on the projected path of the ladder in order to escape it.

Third Row Example

In this example, Red has no third row ladder escape piece. Red 1 provides an escape by threatening to connect to the main group.

abcdefghijklm123456789101112131

After the sequence to Red 3, Blue cannot stop both of Red's non-overlapping connections.

abcdefghijklm12345678910111213321

Second Row Example

In the example below, Red 1 threatens to connect to the main group as a means of outrunning Blue's second row ladder.

abcdefghijklm123456789101112131

After the sequence to Red 7, Red can now connect 5 back to the main group through either of the spaces marked with *.

abcdefghijklm123456789101112137561324

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