One of the most important things in chess is pattern recognition: the ability to recognise typical themes and images on the board, characteristics of a position and their consequences.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Donner"]
[Black "Dunkelblum"]
[Result "0-1"]
[BlackElo "0"]
[FEN "r3k1r1/pp3p1p/4p3/4n3/b1qN4/4B2P/P4PP1/R1Q3KR b q - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
{ A classic annihilation of defense tactic. } 1... Qxd4 2. Bxd4 Nf3+ 3. Kf1 Bb5+ 4. Qc4 Bxc4# 0-1