请了一个高手，帮我弄了个自定义函数，结果看不懂，请看懂的帮我谁详细解释一下，谢谢~~
Function 象棋大师都是软件(RNG As Range, A, B, C, MYNUMBER) As String
Dim ARR, I%, Y$, G$
ARR = RNG
For I = 1 To UBound(ARR)
If ARR(I, 1) = A And ARR(I, 2) = B And ARR(I, 3) = C Then
Y = Y & "," & ARR(I, MYNUMBER)
End If
Next
G = Right(Y, Len(Y) - 1)
象棋大师都是软件 = G
End Function
原文链接https://tieba.baidu.com/p/1966280071

Dim ARR, I%, Y$, G$ 是什么意思？