例題.
            ツモ
さて、テンパイとなりましたが、
打 → としてカンチャン待ちにするか、
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打 → 、 としてシャンポン待ちにするかです。どちらが良いでしょうか?
こうしたときは、その後の手替わりの変化を考えます。
カンチャンにした場合、リャンメンへの変化は、 、 しかありませんが、
シャンポンにした場合、 のほかに、 、 、 、 で手替わりします。
 ツモ →  、  ツモ →  
    ツモ →     
    ツモ →     
    ツモ →     
    ツモ →     
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例題の場合、テンパイを維持しながら、より広い待ちへの手替わりが可能となりますので、
その後の手替わりの変化を考えて、カンチャン待ちより、シャンポン待ちにした方が、
得策になります。
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