The most important feature of the Chess position is the activity of the pieces.
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[Event "U.S. Open"] [Site "Long Beach"] [Date "1955.08.10"] [Round "?"] [White "Almgren, Sven"] [Black "Seidman, Herbert"] [Result "0-1"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "7k/p5bp/7r/3Bp1q1/2P3p1/2BP4/PP2nRQP/7K b - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1... Qc1+ 2. Rf1 Rxh2+ 3. Kxh2 Qh6+ 4. Qh3 Qxh3# 0-1