Lolli's mate
Also known as Lolli's checkmate
Lolli's mate is a queen-and-pawn pattern aimed at a fianchettoed king. A white pawn reaches f6, prising open the dark squares around g7, and the queen then crashes in with Qg7#. Because the f6 pawn defends g7 the king cannot take the queen, and its own pawns on f7 and h7 leave it nowhere to run.
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How it works
The queen on g7 gives check from point-blank range. The king on g8 would love to capture it, but the white pawn on f6 guards g7, so the queen is untouchable. The king's only flight squares are f8 and h8, both covered by the queen on g7. The black pawns on f7 and h7 also block their own king, and neither can take a piece on g7 because pawns capture diagonally (to g6), not straight ahead. With capture, flight and blocking all impossible, it is mate.
How to spot it
Look for it whenever your opponent has castled kingside behind a fianchetto and the bishop that used to sit on g7 has been traded or driven away, leaving the dark squares thin. The recipe is a pawn that reaches f6 (often a relic of an exchange or a pawn storm) plus a queen with a clear path to g7. If the f6 pawn is firmly defending g7 and the enemy king is boxed in by its own f7 and h7 pawns, scan for the queen delivery; it is often a one-move finish that is easy to miss.
Key ideas
- A pawn on f6 is the engine: it both opens the g7 dark square and defends the mating square
- The queen on g7 is immune because the f6 pawn protects it from the king
- The king's own f7 and h7 pawns block its escape rather than help it
- Enemy pawns capture diagonally, so they can never remove a queen sitting on g7
- Most likely once the fianchetto bishop on g7 has been exchanged or chased off
- Look for Qg7 the moment a pawn reaches f6 beside a castled king
Famous example
Named after the 18th-century Italian theorist Giambattista Lolli, an early writer on chess endings and attacks. The pattern is a staple of attacks against the fianchetto, typically appearing after the dark-squared defender on g7 has been swapped off and a white pawn has wedged itself on f6.