Difference between revisions of "User:Selinger"

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(Pasting text for a proposed article)
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== Proposed article: Hygiene ==
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== Proposed article: Tidiness ==
  
'''Hygiene''' refers to basic preventative measures that decrease the likelihood of bad things happening in the future. For example, hand washing decreases the likelihood of getting sick. Hygiene is not a reaction to a specific imminent threat, but a set of general-purpose good practices. In Hex, if a player can make a move that carries no cost or risk, but decreases the chance of something bad happening in the future, it is good hygiene to make the move.
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'''Tidiness''', or '''tidying up''', means not leaving loose ends that could benefit the opponent later. It is not a reaction to a specific imminent threat, but a basic preventative measure that decreases the likelihood of bad things happening in the future. If a player can make a move that carries little cost or risk, but takes away some opportunity from the opponent, it is untidy not to make the move.
  
 
== Examples ==
 
== Examples ==
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   contents="B c2 R d1 1:d2"
 
   contents="B c2 R d1 1:d2"
 
   />
 
   />
Blue would like to play elsewhere on the board. However, this would leave Red with a 2nd row [[ladder escape]] along the bottom edge. While this ladder escape may not look immediately threatening to Blue, it would be bad hygiene to just leave it unattended. Instead, Blue first plays 2, which forces Red to reconnect, say at 3.  
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Blue would like to play elsewhere on the board. However, this would leave Red with a 2nd row [[ladder escape]] along the bottom edge. While this ladder escape may not look immediately threatening to Blue, it would be untidy to just leave it unattended. Instead, Blue tidies up by first playing 2, which forces Red to reconnect, say at 3.  
 
<hexboard size="4x5"
 
<hexboard size="4x5"
 
   coords="none"
 
   coords="none"
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Now Blue has taken away Red's ladder escape and is free to move elsewhere. In fact, Blue also gained a small amount of [[territory]].
 
Now Blue has taken away Red's ladder escape and is free to move elsewhere. In fact, Blue also gained a small amount of [[territory]].
  
To illustrate that this can make a difference, consider the following contrived position, with Blue to move. In this situation, "a" is winning, but "b" and all other moves are losing.
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To illustrate that this can make a difference, consider the following position, with Blue to move. In this situation, "a" is winning, but "b" and all other moves are losing.
 
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<hexboard size="6x6"
 
   coords="none"
 
   coords="none"
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=== Obtuse corner example ===
 
=== Obtuse corner example ===
  
Red has just played 1, threatening to connect to the bottom edge. Blue responded at 2. The result will be a 2nd row [[ladder]] along the bottom edge.
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Red has just played 1, threatening to connect to the bottom edge. Blue responds at 2. This will result in a 2nd row [[ladder]] along the bottom edge.
 
<hexboard size="5x5"
 
<hexboard size="5x5"
 
   coords="none"
 
   coords="none"
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   contents="R d2 e2 B d3 e3 R 1:c3 B 2:b5"
 
   contents="R d2 e2 B d3 e3 R 1:c3 B 2:b5"
 
   />
 
   />
Let's assume that the ladder is threatening to Blue, i.e., either Red can [[ladder escape|escape]] the ladder outright, or gain some other benefit (such as [[climbing]]) from playing the ladder. Red could either start the ladder right away, or first play elsewhere. In either case, it is good hygiene to first play 3 and 4:
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Let's assume that Red has a [[ladder escape]], so that Red will "win" the ladder. Red could start the ladder right away, but it is better to first tidy up the corner by playing 3 and 4:
 
<hexboard size="5x5"
 
<hexboard size="5x5"
 
   coords="none"
 
   coords="none"
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   contents="R d2 e2 B d3 e3 R 1:c3 B 2:b5 R 3:b3 B 4:a5"
 
   contents="R d2 e2 B d3 e3 R 1:c3 B 2:b5 R 3:b3 B 4:a5"
 
   />
 
   />
Note that 3 is immediately forcing: if Blue does not respond, Red connects to the edge. On the other hand, if Red first plays the ladder along the right edge and connects, 3 is no longer forcing. In addition to gaining a bit of territory for Red, moving at 3 also removes any possibility that 2 could help with a blue ladder arriving along the left edge.
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This gains a bit of territory for Red. Note that 3 is immediately forcing: if Blue does not respond, Red connects to the edge. On the other hand, if Red has already played and connected the ladder, 3 is no longer forcing.
  
To illustrate that this can make a difference, consider the following contrived position, with Red to move. In this situation, "a" is winning, but "b" and all other moves are losing.
+
To illustrate that this can make a difference, consider the following position, with Red to move. In this situation, "a" is winning, but "b" and all other moves are losing.
 
<hexboard size="5x5"
 
<hexboard size="5x5"
 
   coords="none"
 
   coords="none"
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   contents="B b1 d3 b5 R c3 d5 E a:b3 b:c4"
 
   contents="B b1 d3 b5 R c3 d5 E a:b3 b:c4"
 
   />
 
   />
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=== Incomplete joseki ===
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Failing to correctly complete a [[joseki]] often results in an untidy situation.

Revision as of 20:26, 27 December 2020

Proposed article: Tidiness

Tidiness, or tidying up, means not leaving loose ends that could benefit the opponent later. It is not a reaction to a specific imminent threat, but a basic preventative measure that decreases the likelihood of bad things happening in the future. If a player can make a move that carries little cost or risk, but takes away some opportunity from the opponent, it is untidy not to make the move.

Examples

Acute corner example

Consider the following situation, where Red has just played 1 to connect her group to the bottom edge.

1

Blue would like to play elsewhere on the board. However, this would leave Red with a 2nd row ladder escape along the bottom edge. While this ladder escape may not look immediately threatening to Blue, it would be untidy to just leave it unattended. Instead, Blue tidies up by first playing 2, which forces Red to reconnect, say at 3.

123

Now Blue has taken away Red's ladder escape and is free to move elsewhere. In fact, Blue also gained a small amount of territory.

To illustrate that this can make a difference, consider the following position, with Blue to move. In this situation, "a" is winning, but "b" and all other moves are losing.

ba


Obtuse corner example

Red has just played 1, threatening to connect to the bottom edge. Blue responds at 2. This will result in a 2nd row ladder along the bottom edge.

12

Let's assume that Red has a ladder escape, so that Red will "win" the ladder. Red could start the ladder right away, but it is better to first tidy up the corner by playing 3 and 4:

3142

This gains a bit of territory for Red. Note that 3 is immediately forcing: if Blue does not respond, Red connects to the edge. On the other hand, if Red has already played and connected the ladder, 3 is no longer forcing.

To illustrate that this can make a difference, consider the following position, with Red to move. In this situation, "a" is winning, but "b" and all other moves are losing.

ab

Incomplete joseki

Failing to correctly complete a joseki often results in an untidy situation.