Avoid moving pawns, because they cannot go backwards.
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[Event "match"]
[Site "?"]
[Date "1960.??.??"]
[Round "?"]
[White "Goldenov"]
[Black "Zakharian"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[ECO "A00"]
[FEN "8/1R6/4P1pk/6pp/4P3/4PKP1/rp6/8 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... g4+ 2. Kf4 ( { White can try: } 2. Ke2 b1=Q+ 3. Rb2 Rxb2# ) 2... Ra5 3. e5 Ra4+ 4. Rb4 Rxb4+ 5. e4 Rb3 6. e7 Rf3# 0-1