How does White lose a bishop in the Noah's Ark Trap? In the Ruy Lopez, after 5.d4 b5 6.Bb3 Nxd4 7.Nxd4 exd4, 8.Qxd4? c5 9.Qc3 c4 and the bishop on b3 has no square. Black wins a piece for a pawn or two. White fell for it in 140 of 1,599 games (8.8%). The safe move is 8.c3.
The trap
- e4 e5
- Nf3 Nc6
- Bb5 a6
- Ba4 d6
- d4 b5
- Bb3 Nxd4
- Nxd4 exd4
- Qxd4? c5
- Qc3 c4
- a4 cxb3
- axb5
The bishop on b3 is hemmed in by Black's pawns on b5 and c4, and it has no safe square left. It falls to ...cxb3. Stockfish 18 rates the position after 8...c5 at -2.7 for White, and about -2.9 at the end of the line, about a piece for a pawn or two.
The safe move
8.c3 dxc3 9.Qd5 Be6 10.Qc6+ Bd7 11.Qd5 repeats the position, or White can try 8.a4 and other quiet moves. Stockfish gives 8.c3 an evaluation of 0.00, equal. Of the 37 legal moves in the position, 10 keep White within one pawn of the best.
The idea: before recapturing, count the squares your bishop can still go to. A bishop on b3 with a pawn on b5 behind it has few.
How often does it happen?
| Rating | Games with the position (per 10,000) | White took the pawn on d4 | Games |
|---|---|---|---|
| Under 1000 | 3.7 | 19% | 79 |
| 1000–1399 | 5.4 | 10% | 412 |
| 1400–1799 | 5.3 | 9% | 644 |
| 1800+ | 5.4 | 6% | 464 |
| All ratings | 5.2 | 8.8% | 1,599 |
Source: 3,062,092 rated Lichess games, September 2026. The position is reached in about 1 game in 2,000, at every rating, because it comes from a standard Ruy Lopez line where strong players know the danger. The fall rate drops from 19% under 1000 to 6% at 1800+.
It rarely ends the game quickly. Winning a bishop still needs accurate play, and in these games Black scored only 51% after White fell. A trap can win material and still be a coin flip in play.
Rule to remember
A bishop with no escape squares can be trapped by pawns. Before recapturing, check whether your pieces still have squares to run to.
Practise it
The free Trap Lab Noah's Ark drill scores all 37 legal moves in the stop position and lets you finish the trap as Black.
Frequently asked questions
What is the Noah's Ark Trap? A Ruy Lopez trap where Black's pawns on b5 and c4 trap White's bishop on b3 after White takes a pawn on d4 with the queen.
How do you avoid the Noah's Ark Trap? Play 8.c3 instead of 8.Qxd4. Check that the bishop on b3 still has an escape square before capturing.
Is the Noah's Ark Trap common? It occurs in about 1 game in 2,000 on Lichess, and White falls for it about 9% of the time.
Want your child to learn to check a piece's escape squares? Book a free 30-minute trial class with our FIDE-rated coaches.
