How do I spot a discovered attack in a middlegame?

Look for a piece blocking a rook, bishop, or queen from attacking a more valuable target. If that piece can move with tempo—especially by capturing—the revealed line may create a decisive tactical threat.

What is a diagonal battery in chess?

A diagonal battery is two aligned pieces, usually a bishop and queen or two bishops, working along the same diagonal. The front piece often captures or forces a response while the rear piece delivers the main attack.

How does a pin help create a winning combination?

A pin restricts a piece because moving it exposes a more valuable target behind it. However, the pinned piece may still move if doing so reveals another attack or creates a stronger tactical threat.

What should I calculate before capturing a pinned piece?

Check every legal recapture and identify what line opens after the exchange. Also look for zwischenzug opportunities, discovered attacks, and whether the final position wins material rather than merely trading pieces.

Nxd4 Puzzle (Rated 1099): Pin — Battery

A discovered attack becomes powerful when a pinned piece is also shielding a valuable target. In this middlegame position, Black’s knight appears tied down by the bishop’s pressure, but moving it uncovers a second attack from the bishop behind it. The diagonal battery creates a tactical overload: White cannot adequately respond to every threat, and Black emerges with a decisive material advantage.