The word "byzaanchy" comes from the Tuvan word for calf. The instrument has four strings, like the four udders of a cow, and it is said that playing the byzaanchy is like milking the sound out of the instrument. The first and third strings are tuned to the same note and the second and fourth strings are tuned a fifth higher. The byzaanchy shares a unique feature with the Chinese huqin family of instruments: the bow is threaded between the strings so that it is drawn across both the upper and lower surfaces of the horsehair. The strings are fingered lightly from underneath rather than being pressed against the neck. Mai-ool Sedip is shown playing a byzaanchy made by Kang-Xuler Saya. This instrument is decorated with a bull's head rather than the usual horse's head.
Hear Mai-ool Sedip play the byzaanchy [01:33] 
Watch Mai-ool Sedip play the byzaanchy [00:18] 
Byzaanchy on Wikipedia