[In the Name of God, the Compassionate, the Merciful
To the Respectable Marja`, «1» His Holiness Imam Khomeini- may his blessings last:
1. Since the certain instruments for game and amusements have religiously permitted utilities such as singing songs, is there any problem to buy and sell them?]
In His Most Exalted Name
There is no problem to buy and sell" common" instruments with the intention of making use of its religiously permitted benefits.
[2. If chess is not used as a gambling instrument but as a mental game, what is the ruling on playing it?]
In His Most Exalted Name
As in the above case, if no gambling is involved, there is no problem.