Opening tasks (first level)
1. Develop your pieces towards the centre
2. Get at least a pawn stake in the centre
3. Castle King's-side
DCK = Develop, Centre, King
If you don't duck, you will get punched!
1. Fell behind in development
[Event "Wch U20 prel-C"] [Site "Antwerp"] [Date "1955.??.??"] [Round "3"] [White "Keller, D."] [Black "Philippe, Georges"] [Result "1-0"] [ECO "B71"] [Annotator "opening: development"] [PlyCount "27"] [EventDate "1955.07.??"] [EventRounds "7"] [EventCountry "BEL"] 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. f4 e5 7. Nf3 Bg4 8. fxe5 Bxf3 9. Qxf3 dxe5 10. Bg5 Bg7 11. Rd1 Qb6 12. Bb5+ Kf8 13. Rf1 a6 14. Bc4 {[#]} 1-0 Also: https://en.wikipedia.org/wiki/Opera_Game https://lichess.org/study/T5MuJ9Eo
2. Lost the centre
[Event "Moscow"] [Site "?"] [Date "1933.??.??"] [Round "?"] [White "Boleslavsky, Isaak"] [Black "Scitov"] [Result "1-0"] [ECO "C54"] [Annotator "centre and space"] [PlyCount "27"] [EventDate "1933.??.??"] 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb6 {[#]} 7. e5 Ng4 8. h3 Nh6 9. d5 Ne7 10. d6 Ng6 11. Bg5 f6 {[#]} 12. exf6 gxf6 13. Qe2+ Kf8 14. Bxh6# 1-0
3. Got King caught in the centre
Click [...] to see list of games
[Event "Munich Schach-Olympia (No FIDE event)"] [Site "Munich"] [Date "1936.08.31"] [Round "20"] [White "Wojciechowski, Antoni1"] [Black "Weiss, Heinrich1"] [Result "1-0"] [ECO "C15"] [Annotator "attack: K in centre"] [PlyCount "45"] [EventDate "1936.08.17"] [EventType "tourn"] [EventRounds "21"] [EventCountry "GER"] [WhiteTeam "Poland"] [BlackTeam "Austria"] [WhiteTeamCountry "POL"] [BlackTeamCountry "AUT"] 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. Nge2 dxe4 5. a3 Bxc3+ 6. Nxc3 f5 {Regis,Dave: '[#] ?! The only way to hang on to the pawn, but it would have been safer to let it go. (Black players do know this, but must have thought themselves capable of the defence.)'} 7. f3 exf3 8. Qxf3 Qh4+ (8... Qxd4 9. Qg3 Nf6 10. Qxg7 Qe5+ 11. Be2 Rg8 12. Qh6 Rg6 13. Qh4 Bd7 14. Bg5 Bc6 15. O-O-O Bxg2 16. Rhe1 Be4 17. Bh5 Nxh5 18. Rd8+ Kf7 19. Qxh5 Kg7 20. Nxe4 fxe4 21. Bh6+ Kf6 22. Rf8+ {1-0 Alekhine Alexander-Nimzowitsch Aaron/Bled 1931}) 9. g3 Qxd4 10. Be3 Qg4 11. Qg2 {Regis,Dave: '[#] White must preserve the Q having sacrificed two pawns'} Nf6 12. Be2 Qg6 13. O-O-O Nc6 14. Nb5 Qf7 15. Bc5 a6 16. Bf3 Nd8 17. Qd2 Nd5 18. Bxd5 axb5 (18... exd5 19. Rhe1+ Ne6 20. Qxd5 Qd7 21. Rxe6+ Qxe6 22. Nxc7+) 19. Rhe1 {Regis,Dave: '[#] White's major pieces are the main artillery in the attack against the uncastled King'} Bd7 20. g4 Nc6 21. gxf5 Qxf5 22. Bxe6 Bxe6 23. Qd7# 1-0 [Event "Moscow"] [Site "?"] [Date "1954.??.??"] [Round "?"] [White "Smirnov, Valery"] [Black "Tikhonov"] [Result "1-0"] [ECO "C37"] [Annotator "attack: K in centre"] [PlyCount "34"] [EventDate "1954.??.??"] 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O gxf3 6. Qxf3 Qf6 7. e5 Qxe5 8. Bxf7+ Kxf7 9. d4 Qxd4+ 10. Be3 Qf6 11. Bxf4 Bg7 12. Nc3 Ne7 13. Nd5 {[#]} Nxd5 14. Qxd5+ Qe6 15. Bd2+ Kg8 16. Rae1 Qxd5 17. Re8+ Bf8 1-0