This article is aimed at beginners only. Building a pattern bank is a very important step towards your chess improvement because we play what we know. But sometimes these patterns backfire too. Here is an example:
Position is taken from a game played on chess.com
Black sees a typical opportunity to win a pawn & unpin his knight by playing 1…Bxf2+ followed by 2…Ng4+, winning back his sacrificed piece with 3…Qxg5. This pattern is very common in the opening stage but one has to be careful in the execuation. Here Bxf2 is a blunder because Black had only seen the typical tactical pattern; if he had tried to calculate or see just half move further, he would have rejected the move based on White’s Qa4+!.
2. Kxf2 Ng4+
3. Kg3! Qxg5
This collects the knight on g4 and Black is lost.
Here is another example:
Bjarte Leer-Salvesen vs Jimmy Mardell, Rilton Cup – 2007
White has threatened the b7 pawn, which is usually known as a poisoned pawn. You might have seen many chess traps where taking such a poisoned pawn resulted in the queen being trapped or some similar disaster, so Black played Nc6 with an idea of Rb8 to trap the queen. Unfortunately for him he has missed something, what is it that he has not seen?
2. Qxb7! Rb8??
Black can still try Nd4! but I guess he did not recheck before playing Rb8. This often happens with beginners.
This forces resignation.
As with the previous example the solution was to look a little bit further rather than trust the pattern blindly. Chess is not just pattern recognition, it also needs accurate calculation.