Most chess players know that it is a good idea to double rooks on an open file or rank (especially the 7th, where there may be pawns waiting to be eaten!), but what if your opponent's defences still hold?
Well, if your Queen is still on the board you could try out Alekhine's Gun! That describes a position where the Queen stands behind the rooks to supply even more power!
It was named after Alexander Alekhine, who used the idea more than once in his games. The most famous of those is below - witness the power of Alekhine's Gun!