Know the ins and outs of how knights fight against passed pawns. Knights can either blockade a passed pawn, or attack it, but not both! If you're trying to promote a pawn, see if you can deflect the enemy knight using your own knight as bait. Knights are also notoriously bad at dealing with passed rook pawns, as they have less room to maneuver.
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[Event "rated untimed match"]
[Site "Sliac"]
[Date "1932.??.??"]
[Round "?"]
[White "Vidmar"]
[Black "Opocensky"]
[Result "1/2-1/2"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "7k/ppp2ppp/8/1Q6/8/P2rqPB1/5RPP/3r1BK1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
{ White is attacked from all angles.|How can white save a draw?|White can
try: } 1. Kh1 { A strategic retreat that breaks a pin. There is nothing
better. } ( 1. Qb4 { Threatening mate with Qf8#. } 1... Rxf1+ 2. Kxf1 Rd1+ 3. Qe1 Qxe1# ) 1... Qe2 ( { Black can try: } 1... Rxa3 2. Qxb7 h5 3. Qc8+ Kh7 4. Qf5+ Kg8 5. Qc8+ Kh7 6. Qf5+ Kg8 7. Qc8+ Kh7 { Draw by repetition of position. } ) ( { Black can also try: } 1... b6 2. h3 Rb3 3. Qf5 Qe8 4. Bxc7 Rbb1 5. Kg1 h6 6. g4 Qe3 7. Kg2 Rd2 8. Qc8+ Kh7 9. Bg3 Rbb2 10. Qf5+ Kg8 11. Qc8+ Kh7 12. Qf5+ Kg8 13. Qc8+ Kh7 { Draw by repetition of position. } ) ( { Black must keep
his queen on the e-file or else: } 1... Qxf2 2. Bxf2 Rxf1+ 3. Bg1 Rdd1 4. Qe8# ) 2. Kg1 Qe3 3. Kh1 Qe2 4. Kg1 Qe3 5. Kh1 Qe2 { Draw by repetition of
position. } 1/2-1/2