We are always warned of being greedy with material captures, and in hindsight its always easy to spot mistakes.
These occur in standard as well as blitz, but the latter gives rise to more of them.
Here's a few from recent games....
In the first White just played QxR on h2
|Black to play : should he re-capture with Rxh2 ?|
In the second, no capture, but Rc6 threatens the Bishop, leaving Rf8 en prise
|White to play : should he play Bxf8 ?|
|Black to play: should here re-capture with bxa3 ?|
The secondary point, is to bear in mind spotting mating patterns.
An obvious one in the first example,in the second its clear, but maybe not obvious.
The third is also less obvious, but quite straightforward.
In fact, the third example could have been much easier for White...
|White to play|