Avoid moving pawns, because they cannot go backwards.
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[Event "rated untimed match"]
[Site "USSR"]
[Date "1967.??.??"]
[Round "?"]
[White "Zurahob"]
[Black "Buhman"]
[Result "1/2-1/2"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r4rk1/3bppbp/2np1np1/p7/1p2PP1q/1B2BQNP/PPP1N1P1/3R1RK1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Bg4 { Black finds a weak square in white's camp. } 2. hxg4 ( { Moving the
white queen out of harm's way drops a pawn. } 2. Qf2 Bxe2 3. Nxe2 Qxf2+ 4. Kxf2 Nxe4+ 5. Kf3 { Black is a pawn up and has strong pressure on b2. } ) 2... Nxg4 3. Rfe1 Nh2 ( { Black must avoid the tempting check because there is no future
in it. } 3... Qh2+ 4. Kf1 Nxe3+ 5. Qxe3 Rfc8 { White wins with a large
material advantage. } ) 4. Qf2 Ng4 5. Qf3 Nh2 6. Qf2 Ng4 7. Qf3 Nh2 8. Qf2 Ng4 9. Qf3 Nh2 { Draw by repetition of position. } 1/2-1/2