I find it hard to defend against rooks placed in 7th rank.
What are the possible defense options?
Please share your knowledge.
[FEN "r4rk1/p1pRR1pp/1p6/8/8/P6P/1P3PP1/6K1 w - - 0 1"] 1.Rxg7+ Kh8 2.Rxh7+ Kg8 3.Rdg7#
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In general, prophylaxis can be used to prevent the rooks getting on the 7th. This is the preferred defense; common challenging moves are to contest open columns with your own rooks, or to guard the 7th rank squares with your minor pieces.
In the case that the rooks are already on the 7th, you should secure the most urgent threats (where your king is or where most of your loose material is), and then trade off rooks or go on the offensive.
Hope that helps!
You should prevent enemy "rook(s) on the seventh" at almost all costs before it happens. Once it does, you're usually doomed.
A single rook on the seventh is worth a pawn. Put another way, it is worthwhile for a player to sacrifice a pawn to get a rook on the seventh. The defender ought to be willing to sacrifice back the pawn to get the rook off the seventh, usually through exchange.
Two rooks on the seventh is even worse. They have almost absolute control of the rank. Here, you are lucky to break it up for "only" a pawn. Here, at least three or four pawns are at White's mercy.
In the diagrammed position, with two white rooks on the seventh and pawns even (for now), Black is dead lost. Black would need almost an (extra) minor piece, say a B on h6, to compensate.
You need to prevent rooks coming into 7th rank by exchanging them with your own rooks. When your opponent's rook is eyeing towards 7th rank you need to restrict its mobility by continuously moving your rook in front of his so that the rooks get exchanged. The old teachers say that rook on the 7th rank acts like a pig which will gobble up the pawns. Here in the picture it is two rooks on 7th Rank which means game over for black.
A king on the 6th rank and pawns that can't be collected too easily are a good countermeasure. With two rooks often it is possible to attack opponent's rook forever to protect you from the situation where there are two deadly rooks on 7th rank. And if you for example need to protect the f7 pawn in a two-rooks endgame, it is better to try to put your rook on f6 than on f8. You can counterattack f2 in such a case. And generally try to avoid scenarios with opponent that active.