Wu Zhang Bie Tong (五臟別通) theory is translated into English as "Same Energy Attraction". The source of the theory is the Huang Di Nei Jing (Yellow Emperor's Inner Classic). In that source text they describe the open, pivot, close theory/law, though the theory has roots in another source, the Yi Jing (The Book of Changes).
Relationships of the Six Channels
There are three Yang and three Yin channels with three sets of similar energetic profiles. These are the six types of matching channels of the hand and foot: Yangming, Taiyang, Shaoyang, Taiyin, Shaoyin, Jueyin. Each of the channels relates to another channel of opposite Yin/Yang polarity, opposite limb, and matching energy. The word "relate" is used here to describe a correspondence that connects the two channels and allows points on one to treat issues usually associated with the other, or local areas on the other channel.
For example, Yangming and Jueyin relate to each other in this theory because they are the "Extreme Yang" and "Extreme Yin" of the channels. Taiyin and Taiyang also relate to each other as "Greater Yin" and "Greater Yang", while Shaoyin and Shaoyang relate to each other as "Lesser Yin" and "Lesser Yang". In the Huang Di Nei Jing the Taiyin/Taiyang and Shaoyang/Shaoyin relationships are clearly stated, while the Yangming/Jueyin pairing is deduced from the theory but not mentioned specifically.
As the Taiyin and Taiyang channels are paired in this way, the Foot UB channel relates to the Hand LU channel, while the Hand SI channel relates to the Foot SP channel. The Shaoyang and Shaoyin channels are also paired, and so the Foot GB channel relates to the Hand HT channel, while the Hand SJ channel relates to the Foot KD channel. Lastly, the Yangming and Jueyin are paired, and the Foot ST channel relates to the Hand PC channel, while the Hand LI channel relates to the Foot LV channel.
Examples: Regular Points
In TCM there are many examples of point indications that reflect this theory. LI11 can treat dizziness because it is on the Hand Yangming LI channel, and so can treat the Foot Jueyin LV channel, which can have a symptom of dizziness. SI4, on the Hand Taiyang channel, can treat jaundice because of the relationship to the SP Foot Taiyin channel, which has symptoms of SP dampness. ST36 is on the Foot Yangming channel, and so relates to Hand Jueyin PC channel, and can therefore treat heart disorders. Lastly, PC6 is on the Hand Jueyin channel, and so relates to the Foot Yangming channel and can treat ST channel knee pain.
Examples: Master Tung points
Many of the Master Tung points also share these same relationships. Zhong Zi and Zhong Son are located close to and react with the Lung channel, and are used to treat the UB neck area and back pain. An Huang is located close to the HT Hand Shaoyin channel and can treat yellow eyes from jaundice due to the relationship with the Foot Shaoyang GB channel.
Huan Chao is located on the San Jiao Hand Shaoyang channel, and relates to the Foot Shaoyin KD channel to treat Kidney deficiency gynecological disorders and infertility. Tong Guan and Tong Shan treat Heart disorders because they are on the ST channel and therefore relate to the PC channel.
Mu Xue is located on the LI channel and can treat hernia due to the relationship with the LV channel. Da Jian, Zhong Jian, Xiao Jian and Fu Jian are located on the LI channel and can treat hernia as well. Lastly, Shen Guan (1.5 cun below SP9) is famous for frozen shoulder due to the SP channel's relationship with the SI channel.