Noah's Ark Trap
Spot the mistake, then find the punishment
Starting positionWhite to move
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The temptation
11.Qd5 is the move that springs the trap. Qd5 centralizes the queen and keeps pressure on f7. White concentrates on queen activity rather than the bishop's remaining retreat squares.
Why it works
11...c4 attacks the b3 bishop. The b5 pawn covers a4 and c4; White's own pawns occupy a2 and c2, leaving no safe retreat along the bishop's diagonals. The c-pawn moved from c5 to c4, so the final position contains pawns on b5 and c4, not two black c-pawns. White will have to give up the bishop or spend material on a tactical escape. The final Qd5 is the mistake that allows this pawn cage.
The b- and c-pawns close the cage
c4 attacks b3 while b5 covers a4 and c4. The bishop's own a2 and c2 pawns block its backward diagonals.
How to avoid it
After 7...exd4, consider 8.c3 instead of Qxd4, opening c2 as a retreat square for the bishop. More broadly, preserve a retreat for Bb3 before chasing activity with the queen.
The opening behind it
Learn the sound version of this line and the trick stops being tempting.