LaviChess

The Cambridge Springs trap: an everyday bishop move that costs a piece

White develops the bishop to d3, the most natural move in the whole Queen's Gambit. But in this particular position Black opens the fifth rank, and two white bishops are hanging at once.

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The position before 9.Bd3. White to move, and the natural move loses.

The trap

The Cambridge Springs Defense arises in the Queen's Gambit Declined after 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.e3 c6 6.Nf3 Qa5. The queen on a5 pins the knight on c3 and stands on the same rank as the bishop on g5. Only Black's own pawn on d5 stands between them.

White often answers 7.Nd2 to stop …Ne4, and after 7…Bb4 8.Qc2 O-O White is ready to develop the rest.

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. e3 c6 6. Nf3 Qa5 7. Nd2 Bb4 8. Qc2 O-O 9. Bd3 dxc4 10. Bxf6 cxd3 11. Qxd3 Nxf6

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8… O-O

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Open on the analysis board

Why it's easy to fall for

9.Bd3 is the most common developing move in the Queen's Gambit. The bishop aims at h7, and White can castle next move.

But with the knight gone from f3, nothing protects the bishop on g5. After 9…dxc4! the pawn attacks the bishop on d3, and suddenly the queen sees all the way to g5. Two pieces are attacked at once.

What White should have played

Play 9.Be2. The bishop isn't on d3, where the pawn can hit it. The position is about equal.

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9. Be2

Right. The bishop isn't where a pawn on c4 can take it, and White can meet 9…dxc4 with 10.Bxf6 and 11.Nxc4. The position is about equal.

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Open on the analysis board

How it ends

Black wins a whole piece. After 10.Bxf6 Black first takes the bishop on d3, and then the knight on f6. If White tries 10.Nxc4 instead, 10…Qxg5 follows.

How often does it happen?

Our numbers reach as far as 7.Nd2, which 121,098 of the 611,084 games between club players in that position played (20%). Black won 42% of those games. After that the position is too rare to be among the positions we have counted, so we can't say how often the mistake itself is made.

Our numbers reach as far as 7.Nd2, which 95,921 of the 340,125 games between strong players in that position played (28%). Black won 41% of those games. After that the position is too rare to be among the positions we have counted, so we can't say how often the mistake itself is made.

Move by move: club players

MoveGames in the positionPlayed the moveThen White wonDrawBlack won
6…Qa51,494,532609,580 (41%)46%6%48%
7.Nd2611,084121,098 (20%)50%8%42%
Move by move: strong players
MoveGames in the positionPlayed the moveThen White wonDrawBlack won
6…Qa5745,278339,634 (46%)48%7%45%
7.Nd2340,12595,921 (28%)50%8%41%

"Played the move": of the games in the position, how many continued with the move of the trap line; then how those games ended. A position missing from the table is too rare for our numbers. Source: games on Lichess in blitz, rapid and classical, fetched 7 November 2026. Club players means games where the players average 1600 or more, strong players games where they average 2000 or more.

Explore the position on the analysis board: the moves club players choose here and how the games tend to end.

Try it

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White has just played 9.Bd3. Black to move: win a piece!

Your opponent moves…

Two moves to find

The history

The defense is named after a tournament in Cambridge Springs, Pennsylvania, in 1904, where it was played several times. According to The Oxford Companion to Chess, Emanuel Lasker played it as early as 1892.

Alexander Alekhine won a game with it against José Raúl Capablanca in the 1927 world championship match, and Magnus Carlsen won a game with it against Boris Gelfand in the 2013 Candidates Tournament.

Frequently asked questions

What is the Cambridge Springs trap?

After 6…Qa5 7.Nd2 Bb4 8.Qc2 O-O the natural 9.Bd3 loses a piece: 9…dxc4! attacks two bishops, and after 10.Bxf6 comes the in-between move 10…cxd3.

How does White avoid the trap?

By putting the bishop on e2 instead of d3, or by not leaving the bishop on g5 unprotected when the fifth rank can open.

Every move on this page has been checked against the rules of chess, and every judgement of who stands better has been checked with a chess computer.

Updated November 14, 2026