Difference between revisions of "Nozoki"

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(Changing the direction of the redirect, as the term "peep" seems more common in Hex than "nozoki")
 
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A nozoki (term borrowed from Go) is a [[Forcing moves|forcing move]] to which opponent has just a single answer to defend against an immediate threat. This situation occurs if one threatens to cut a connection between major groups or key stones of opponent's. The stone causing this threat is called a nozoki.
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#REDIRECT [[Peep]]
 
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Sometimes it's hard to tell if a move is [[Forcing moves|forcing]], i.e. if the nozoki is correct or wrong. Playing correct nozokis is one of the most sophisticated aspects of hex strategy.
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== Example ==
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<hexboard size="6x6"
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  coords="show"
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  contents="B :d3 R :e4 B :e3 R :b3 B :b4 E *:c4 E *:c3"
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  /><br/>
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In this position red player can play 2 '''correct nozokis''' - c4 or c3. In case of playing c3, blue has to defend with c4. In case of playing c4, blue has to defend with c3. Otherwise blue loses the game.
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Notice that moves on a4, a5, f2 and f3 are '''wrong nozokis'''. Against a4, a5 blue has a choice of playing b5 which improves their position. Similarly, against f2, f3 blue should play d2.
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== Crucial nozoki ==
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There is a great use for playing nozokis. In certain conditions a player can benefit from them and claim victory. Look at the following example:
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<hexboard size="9x9"
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  coords="show"
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  contents="B :h4 R :d4 B :e5 R :g6 B :c6 E *:d6"
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  /><br/>
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The only winning move for red is the nozoki on d6. If red misses it the game proceeds as follows and the winner is blue.
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<hexboard size="9x9"
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  coords="show"
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  contents="B :h4 R :d4 B :e5 R :g6 B :c6 R 1:g4 B 2:g5 R 3:f5 B 4:f6 R 5:e6 B 6:d8 R 7:e7 B 8:e9"
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  /><br/>
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If d6 is played then red win.
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<hexboard size="9x9"
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  coords="show"
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  contents="B :h4 R :d4 B :e5 R :g6 B :c6 R 1:d6 B 2:d5 R 3:g4"
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  /><br/>
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Latest revision as of 06:23, 1 January 2021