Alekhine's gun
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Everyone is so familiar to Alekhine's gun but is there any match that there are two Alekhine's guns used in the same row or the same column?
Rather doubtful in my opinion. First one player already owns the file or rank, and as such the opposing player cannot hope to take command of the same. Therefore he is unable to create and use a gun in either position. Secondly the use of the gun is either to gain in points (material) which would mean a Q, R and piece (Q,R,B,K) or a mate. This would result in a loss of at least one rook, therefore a new gun cannot be recreated by the same player, but he would still own the rank or file.