The most important feature of the Chess position is the activity of the pieces.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown248"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[ECO "B00"]
[FEN "8/8/4k3/1pp1p3/5pP1/P1P2K2/1P3RP1/5r2 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... e4+ ( { Black can try: } 1... Rxf2+ 2. Kxf2 c4 3. Kf3 Kf6 4. Ke4 Kg5 5. Kxe5 Kxg4 6. Kd5 Kg3 7. Ke5 Kg4 8. Kd5 Kg3 9. Ke5 Kg4 10. Kd5 { Draw by
repetition of position. } ) 2. Ke2 Rxf2+ 3. Kxf2 c4 4. g3 f3 5. Ke3 Kf6 6. g5+ Kxg5 7. Kf2 Kg4 8. Ke3 Kxg3 9. Kd2 f2 10. Ke2 Kg2 11. Ke3 f1=Q 12. Kxe4 { Black wins with a large material advantage. } 0-1