All pieces, except pawns, can move backwards.

But because the opponent's pieces are trying to attack us, we get used to them moving down the board towards us, and our pieces moving up the board in the other direction.

So that means, backwards moves are sometimes hard to spot.

Here are some junior players missing a backwards moves.

Click [...] or F3/C3 to see all the games

[Event "LJCC Lite - Under 10 FINALS"]
[Site "lichess.org"]
[Date "2020.12.06"]
[Round "?"]
[White "pengxiao_zhu"]
[Black "TimothyMcBride"]
[Result "1-0"]
[ECO "D10"]
[WhiteElo "1564"]
[BlackElo "1498"]
[Annotator "Regis,Dave"]
[SetUp "1"]
[FEN "6k1/1p1b1rB1/2p1p1Q1/p6N/2pP1p2/P2qP3/5PPP/1R4K1 w - - 0 26"]
[PlyCount "2"]
[EventDate "2020.??.??"]
[TimeControl "1200+5"]
[WhiteClock "0:17:20"]
[BlackClock "0:16:51"]

{[#] Pretty good again, did what you needed to do well, but there was one move
where it all could have gone wrong!} 26. Bf6+ $4 {[%emt 0:00:10]} Kf8 {[%emt 0:
00:02] [You both missed the backwards move 26... Qg6 You took 10 seconds and
Black took 2 seconds!]} (26... Qxg6) 1-0

[Event "South West vs Wales"]
[Site "?"]
[Date "2013.06.02"]
[Round "1"]
[White "Hafstad, Leif"]
[Black "Mamhanda"]
[Result "0-1"]
[ECO "B02"]
[Annotator "Regis,David"]
[SetUp "1"]
[FEN "r3kb1r/ppp1pppp/2n5/3q3b/8/5N1P/PPPPBPP1/R1BQ1RK1 b kq - 0 8"]
[PlyCount "4"]

{[#] You had a couple of chances but let them go.} 8... Nd4 $4 {Losing a piece}
9. Nxd4 {Taking one piece and discovering an attack on another. We see this
trick often in the French.} Bxe2 10. Qxe2 $4 {Played without thinking about
the alternative! "Look at every check and every capture, every move!" as they
say.} 0-1

[Event "WWoE2020"]
[Site "Chepstow"]
[Date "2020.01.11"]
[Round "1"]
[White "Gibbs, James"]
[Black "NN"]
[Result "1-0"]
[ECO "C50"]
[Annotator "Regis,Dave"]
[SetUp "1"]
[FEN "r1b2rk1/ppp1qpp1/2np3p/8/2BPP1n1/2P2N2/PP1NQ1PP/R4RK1 b - - 0 12"]
[PlyCount "4"]
[EventDate "2020.??.??"]

{[#]} 12... Bf5 $4 (12... Bd7 {[%eval 357,0]}) 13. exf5 Qxe2 14. Bxe2 {Black
must have missed this backwards move. Sadly White is now a piece ahead and has
no problems.} 1-0

[Event "WWoE"]
[Site "?"]
[Date "2019.01.12"]
[Round "3"]
[White "Stevenson, Neil"]
[Black "Bacon, Benny"]
[Result "1-0"]
[ECO "C56"]
[Annotator "Regis,David"]
[SetUp "1"]
[FEN "5nk1/pp1r1pp1/1qp4r/4P3/P5QP/8/BP1p1RP1/R5K1 b - - 0 29"]
[PlyCount "4"]
[EventDate "2019.??.??"]

{[%mdl 8192] [#] A really instructive game -- not much consolation for losing,
I know, but exciting and well-played by both sides.} 29... d1=Q+ $4 {The game
turns on a sixpence!} (29... Qxb2) ({1.79 Stockfish 8 64:} 29... Qxb2 30. Rff1
Ne6 31. Bxe6 Rxe6 32. Qf4 c5 33. Rfd1 Rxe5 34. Kf1 b6 35. g3 Qc3 36. a5 bxa5
37. Rab1 Qd3+ 38. Kg1 Qe2 39. Qf1 Qe3+ 40. Kh2 Kh7 {[%eval -540,17]}) 30. Rxd1
Rxd1+ 31. Qxd1 $18 {I guess this backwards move was what Black missed. Now
White is better: Black has given up the strong d-pawn and the vital defender
of the second rank, so f7 must fall.} 1-0

And just to make you feel better, here are three Grandmasters doing the same thing!

Click [...] or F3/C3 to see all the games

[Event "Petropolis Interzonal"]
[Site "Petropolis"]
[Date "1973.08.15"]
[Round "16"]
[White "Reshevsky, Samuel Herman"]
[Black "Savon, Vladimir A"]
[Result "0-1"]
[ECO "A77"]
[WhiteElo "2565"]
[BlackElo "2570"]
[Annotator "Regis,David"]
[SetUp "1"]
[FEN "6R1/4bQ2/pn4pk/1pqP3p/6P1/5B2/5PKP/1b6 w - - 0 40"]
[PlyCount "2"]
[EventDate "1973.07.23"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "BRA"]
[EventCategory "12"]
[SourceTitle "IZT"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

{Reshevsky, horribly short of time once again, hopes to deliver checkmate: [#]} 40. Qxg6+ Bxg6 0-1

[Event "Candidates Tournament"]
[Site "Amsterdam"]
[Date "1956.03.28"]
[Round "2"]
[White "Petrosian, Tigran V"]
[Black "Bronstein, David I"]
[Result "0-1"]
[ECO "E65"]
[Annotator "Regis,David"]
[SetUp "1"]
[FEN "1rb2r1k/1p1n2q1/p2Q2p1/P2Npn1p/2P1N2P/6P1/1R3PB1/1R5K w - - 0 36"]
[PlyCount "2"]
[EventDate "1956.03.27"]
[EventType "tourn"]
[EventRounds "18"]
[EventCountry "NED"]
[SourceTitle "Candidates"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "2"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

{The blunder of the century: [#]} 36. Ng5 Nxd6 0-1

[Event "02, Wijk m ;CBM 34"]
[Site "02, Wijk m ;CBM 34"]
[Date "1993.??.??"]
[Round "1"]
[White "Larry Christiansen"]
[Black "Anatoly Karpov"]
[Result "1-0"]
[ECO "E12"]
[Annotator "Regis,David"]
[SetUp "1"]
[FEN "r2qkb1r/p2p1ppp/1pb1p3/7n/2P1P3/P1N1B3/1PQ2PPP/R3KB1R b KQkq - 0 11"]
[PlyCount "2"]
[EventDate "1993.??.??"]

{Black puts a second piece in play without protection [#]} 11... Bd6 12. Qd1 1-0