Legal's Mate: the most famous queen sacrifice

Legal’s Mate is perhaps the oldest and most famous queen sacrifice in chess history. The white queen looks defenseless, the opponent excitedly captures it… and gets checkmated three moves later by two knights and a bishop.

Can you imagine giving away your most powerful piece and still winning? Let’s see how it works.

The history of Legal’s Mate

In the first half of the 18th century, the French master Sire de Légal was the best player in the world. Back then, before Philidor revolutionized the game with the Philidor Defense, Légal was the absolute reference in the cafés of Paris.

Around 1750, in an exhibition game against Saint-Brie, Légal executed this queen sacrifice that left everyone stunned. The sequence was so elegant that the pattern was immortalized under his name.

What makes Legal’s Mate special is its apparent tactical contradiction: White lets their queen be captured and wins the game on the spot. It’s a perfect example that in chess material isn’t everything. What matters is piece coordination.

The full pattern

The sequence starts from an opening where Black plays Bg4, pinning the knight on f3 against the queen:

1.e4 e5  2.Bc4 d6  3.Nf3 Bg4  4.Nc3 g6??
5.Nxe5!! Bxd1  6.Bxf7+ Ke7  7.Nd5#

Why the sacrifice works

Why CAN’T Black capture the queen without paying for it? Let’s go step by step.

After 5.Nxe5!! Bxd1 6.Bxf7+: the bishop checks the king on e8. The king can only go to e7: d8 is occupied by its own queen and f8 by its own bishop.

After 6…Ke7 comes 7.Nd5#: the knight jumps to d5 and checks the king on e7. And there’s the mate, because the king has no free square:

The king has nowhere to go. Checkmate.

Once you master this pattern, you’ll start seeing these coordinations in your own games. It’s what separates a player who calculates from one who just moves pieces.

When does Legal’s Mate work?

It’s not magic: Legal’s Mate needs three conditions at once.

1. Black has played Bg4, pinning the f3 knight with an apparent pin.
2. White has the bishop on c4 aiming at f7.
3. White has the knight on c3 ready to jump to d5.

If any of the three is missing, the sacrifice doesn’t work.

Black’s mistake in the example is 4…g6??: it weakens the diagonal and doesn’t help development. If Black plays well (Nf6, Nc6…) the combination doesn’t exist. This is part of the mating patterns worth knowing so you don’t fall for them.

How to defend if you’re playing Black

Playing Black with your bishop on g4? Take note.

• Don’t play g6: it weakens the kingside too much.
• If White plays Nxe5, don’t automatically capture the queen. First check whether Bxf7+ threatens a check you can’t stop.
• Before taking any apparently hanging piece, ask yourself: can my king escape what comes next?

The golden rule: a hanging queen is sometimes a trap. In chess, always verify before capturing.

More sacrifice patterns: Opera Mate · Boden’s Mate · Quick checkmate