Second front

A second front appears when the defender has contained the main pressure and the attacker creates meaningful play elsewhere. It may arise on the opposite side of the board, through a central pawn advance that attacks the opposing formation, along a newly cleared vertical line for rooks or the queen, or against a second target that offers an entry route. The new operation must demand real defensive resources.

Force the defender to switch fronts

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Start

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Rxh7

The rook on c1 attacks c6, but the rook on c7 defends it. The same file contains both the attack and the defense.

The Defense Contains the Main Front

White's rook pressures c6, but Black's rook on c7 supports the pawn from behind. As long as that defense remains, capturing on c6 does not advance the pressure.

1. The rook on c1 attacks c6, but the rook on c7 defends it. The same file contains both the attack and the defense.

Its purpose is to stretch the opposing pieces. A defense may be sufficient to protect one pawn or seal one entry point, yet become overloaded when it must cover two distant areas. A second front is therefore a practical way to apply the principle of two weaknesses.

A pawn move on the other side of the board is not automatically a second front. The operation must be prepared and connected to the rest of the position. A regrouping, a sequence that redirects several pieces, may be needed to transfer a queen, rook, or king. If opening the front lets the opponent create threats faster than your own attack, the plan can backfire.