We all have heard the phrase "Patzer sees check, patzer gives check." I would like to add a new one, "Patzer sees combination, patzer plays combination." I see this a lot especially with young players, they see what could be an easy combination that wins material and they go for it, without really even thinking about it. Take this game, for example, from a tournament I played in last weekend. This game gave me my quickest win in a rated otb tournament.
Me vs. "Patzer"
Round 3 of 5
1.e4 e6 2.d4 d5 3.e5 c5 4.c3 Nc6 5.Nf3 Qb6 6.a3 Bd7 (6..c4!) 7.b4 cxb4 8.cxb4 Nge7 9.Be3 Nf5 10.Bd3!(dia.)
Here the normal move is 10..Nxe3, which has been proven to be much better for white, suddenly the other player decides I have made a blunder.
10..Nfxd4? 11.Nxd4 Nxd4 12.0-0 and white is about to win the knight. The game ended soon 12..a5 13.Nd2 axb4 14.axb4 Rxa1 15.Qxa1 Bxb4 16.Bxd4 Bc5?? 17.Qa8+ 1-0
I guess I'm saying it's more important to see the position correctly after the end of your combination then it is to just to play looking to win material.