Found this nice tactical puzzle the other day. It highlights the devestating effects of having two rooks (doubled up) on the seventh rank.
White to Move
1. Bh6! is decisive (see below). Black has no real options from here.
1... Rg8 guards the g7-pawn for one more turn, but doesn't do anything when 2. Re7 is played (see below).
1... gxh6 also leads to disaster after 2. Re7 (see below).
And black is replyless. If he doesn't move his f8-rook, 3. Rxh7+ and 4. Rg7# ensues. Moving the rook is equally unpleasant for black. 2... Rfd8 (for example) leads to 3. Rxh8+ Kg8. 4. Nxf6+ (see below).