Gady Costeff has managed to create the Babson Task in a endgame study.

Below you may find the study and the EG 238 originals article under Breaking News (page 270).

UPDATE: Gatti, Daniele 1987 has created a better Endgame study with a legal position and without promoted pieces !!

At wikipedia you may find the definition and more about the Babson task.

More also about it at the Tim Krabbe website or at Chessbase.

Harold van der Heijden also has written an article about this at ChessBase.

Also a history about this task in German Language by Peter Hoffman at the website by Ralf Krätschmer.

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EG238 - originals

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[Event "Babson Task"] [Site ""] [Date ""] [Round ""] [White "Costeff HH"] [Black ""] [Result "1-0"] [SetUp "1"] [FEN "4n3/pr1n1Ppp/p4krb/P2PN1p1/K2P2P1/PN6/1Bppp3/2R1N3 b - - 0 1"] [PlyCount "8"] 
 {The position is unreachable by a single capture. For example, if Ph2 could start on g3, the position would be reachable. Comments of the type "+100" or "=100" indicate that the position was played by Stockfish 16.1 one hundred times against itself with the indicated score of 100 straight wins or draws.}  1... d1=Q (1... d1=R $1 2. fxe8=R $1 (2. fxe8=Q Rxd4+ 3. Nc4 Nc5+ 4. Nxc5 Rb4+ 5. axb4 {stalemate}) (2. fxe8=B Rxc1 3. Bxc1 (3. Nxc1 Rxb2 4. Nxe2 Rb1 5. N1d3 Ke7 6. Bxd7 Rf6 7. Be6 g6 8. Bg8 Rff1 9. Bxh7 Rfe1 10. Ndc1 Rexc1 11. Nxc1 Rxc1 12. Bxg6 Kd6 13. Be4 Rd1 14. Nc4+ Kc7 15. d6+ Kd8 16. Bxc2 Rxd4 17. Kb4 Rxg4 18. Kc5 Bg7) 3... Nxe5 4. Nc5 Rb5 5. dxe5+ Kxe5 6. Bxb5 axb5+ 7. Kxb5 Kxd5) (2. fxe8=N+ Ke7 3. Nxg6+ Kxe8) (2. Rxc2 Ke7) 2... Rxd4+ (2... Nxe5 3. Rxe5 Kf7 ({HH } 3... Rxc1 4. Bxc1 Kf7 5. Rxe2 Rd6 6. Nxc2 Rxd5 7. Ne3 Rdb5 8. Nc5 Re7 9. Rf2+ Kg6 10. Rc2 Re8 11. Nc4 Re1 12. Ne5+ Kf6 13. Rf2+ Ke7 14. Bd2 Rd1 15. Rf7+ Ke8 16. Bc3 Rc1 17. Ne4 Rd5 18. Bb4 Kd8 19. Nd6) 4. Rxe2 Re7 5. Rxe7+ Kxe7 6. Nxc2 Rxc1 7. Bxc1 Kd6 8. Nb4) 3. Nc4 {(eg - HH):} Kf7 4. Bxd4 Kxe8 5. Rxc2 Rb5 6. Rxe2+ Kf7 7. Rf2+ Kg8 8. Ne3 Rd6 9. Nf5 Rbxd5 10. Ne7+ Kh8 11. Nxd5 Rxd5 12. Rc2) (1... d1=B $1 2. fxe8=B $1 (2. fxe8=Q Nc5+ 3. Nxc5 Rb4+ 4. axb4 {stalemate }) (2. fxe8=R Nc5+ 3. Nxc5 Rb4+ 4. axb4 {stalemate}) (2. fxe8=N+ Ke7 3. Nxg6+ hxg6) {HH} 2... Ke7 3. Bxg6 hxg6 4. Bc3 Kd6 5. Nxc2 Ke7 6. d6+ Kxd6 7. Nxd7 Rxd7 8. Bb4+) (1... d1=N $1 2. fxe8=N+ $1 (2. Ba1 Nd6 3. Nxd7+ Kxf7 4. Ne5+ Ke8 5. Nxg6 hxg6 6. Rxc2 Ne3 7. Rxe2 {=100} (7. Rc6 Ne4 {=100} 8. Nc5 Nxc5+ 9. dxc5 Nxd5 10. Re6+ Re7 11. Rxa6 Re4+ 12. Kb3 Rxg4 13. Re6+ Ne7 $10) 7... Re7 8. Nd3 Nxg4 9. Rc2 (9. Ne5 Nf6) 9... Nf6 10. Ne5 g4 11. Nc5 Nxd5 12. Nxg4 Ne3 13. Nxe3 Bxe3 14. Nxa6 Nf5) (2. Rxc2 Nd6 3. Nxd7+ Kxf7 4. Ne5+ Kg8 5. Nxg6 hxg6 6. Bc3 { =100} (6. Ba1 Ne3 7. Rc6 (7. Rxe2 Nxg4 8. Re6 Nf7 {=100}) 7... Nf7 {=100}) 6... Nc4 7. Ba1 Nde3 8. Rxe2 Nxg4 9. Nd3 Nf6 10. Rc2 Nd6 11. Rc6 Nf7 12. Nbc5 Rb1) 2... Ke7 3. Nxg6+ hxg6 4. Rxc2 Kxe8 5. Rxe2+ Kd8 6. Ba1 Nf6 7. d6 Nxg4 ({HH}  7... Rd7 8. Nc5 Rxd6 9. Nb7+ Kd7 10. Nxd6 Kxd6 11. Nc2 Nxg4 12. d5 Ngf2 13. Nb4 g4 14. Re6+ Kd7 15. Rxa6 Be3 16. Rxg6 Bc5 17. Rxg7+ Kd6 18. Kb5 Bxb4 19. axb4) 8. Nc5) (1... Nd6 2. Nxd2 {+100} (2. Nxd7+ $6 Kxf7 3. Ne5+ Kf6 4. Nxd2 Rxb2 5. Nxg6 Kxg6 6. Nd3 Rb5 7. Nf3) 2... Rxb2 3. Nxd7+ Kxf7 4. Ne5+ Ke8 (4... Kf6 { +100} 5. N1d3 Rb5 ({HH:} 5... Rb7 6. Rxc2 Ke7 7. Nxg6+ hxg6 8. Nb3 Nb5 9. Nbc5 e1=Q 10. Nxe1 Rc7 11. Kb4 Nxd4 12. d6+ Kxd6 13. Ne4+ Kd7 14. Rd2 Ke6 15. Rxd4 Ke5 16. Nf3+ Kf4 17. Ned2+ Ke3 18. Re4+ Kd3 19. Re6) 6. Nb4 Ke7 ({HH:} 6... Nb7 7. Kb3 Ke7 8. Nxg6+ hxg6 9. Kxc2 Nxa5 10. Re1) 7. Nxg6+ hxg6 8. Nf3 Nf5 ({HH:}  8... Ne4 9. Rxc2 Kd8 10. Rc6 Kd7 11. Rxa6 Rb7 12. Re6 e1=Q 13. Nxe1 Nc3+ 14. Kb3 Nxd5 15. Ra6 Nc7 16. Rxg6 Kc8 17. Ned3) 9. Rxc2 Nxd4 10. Nc6+ Nxc6 11. dxc6 Kd8 12. Rxe2 Rc5 13. Rd2+ Kc7 14. Nd4) ({HH:} 4... Ke7 5. N1d3 Rb7 (5... Rb5 6. Nxg6+ hxg6 7. Rxc2 Rxd5 (7... e1=Q 8. Nxe1 Rxd5 9. Ndf3 Nb7 10. Rc7+ Rd7 11. Rxd7+ Kxd7 12. Nd3 Ke7 13. Nb4 Ke6 14. Ne5 Nd6 15. Nxa6 Kd5 16. Nc7+ Kxd4 17. Nc6+ Kc5 18. Nxa7) 8. Nf3 Nb5 (8... Nb7 9. Rxe2+ Kd6 10. Nde5 Rxa5+ 11. Kb4 Rb5+ 12. Kc3 Rb1 13. Nc4+ Kd7 14. Nfe5+ Kc7 15. d5 Rc1+ 16. Kd4 a5 17. Nd3 Rg1 18. Re7+ Kc8 19. Nce5 Rf1 20. Re6 Kd8 21. Rc6 Rf6 22. Nc4 Rxc6 (22... Rf8 23. d6) 23. dxc6) (8... Kf6 9. Rxe2 Nb5 10. Rd2 Kf7 (10... Nxd4 11. Nb4 Nxf3 12. Rxd5 Ke6 13. Rc5 Ne5 14. Rc7 Nxg4 15. Rxa7 Ne5 16. Rxa6+ Kf5 17. Rb6 g4 18. Nc2 g3 19. a6 g2 20. Nd4+ Kg4 21. Rb1 Be3 22. a7) (10... Rf5 $5 11. gxf5 g4 12. Rg2 gxf5 (12... gxf3 13. Rxg6+ Kxf5 14. Rxa6 Nxd4 15. Rxa7 Nc6 16. Rf7+ Ke4 17. Nf2+ Kd5 (17... Ke3 18. Ng4+ Ke2 19. Nxh6 f2 20. Nf5) 18. Rxf3)) 11. Nb4 Rd6 12. d5 Rf6 13. Ne5+ Ke7 14. Nxa6 Nd6 15. Nc6+ Kf8 16. Nc5) 9. Rxe2+ Kd6 10. Re8 Kd7 11. Ra8 Kc7 (11... Rd6 12. Kb4 Kc6 13. Nc5 Kc7 14. a4 Nxd4 15. Rxa7+ Kb8 16. Rxa6 Nc6+ 17. Kc4) 12. Kb4 Rd7 13. a4 Nxd4 14. Rxa7+) (5... e1=Q 6. Nxg6+ Kd8 7. Rxe1) 6. Nxg6+ hxg6 7. Rxc2 Nb5 ({HH:} 7... Kd8 8. Nf3 Nb5 (8... Ne4 9. d6 Nxd6 10. Rxe2 Nb5 11. Rc2 Rc7 12. Nc5 Ke7 13. Kb4 Rc6 14. a4 Nc7 15. Re2+ Kd8 16. Ne5 Rf6 17. Kc4 Kc8 18. d5 Rd6 19. Nc6 Nxd5 20. Re8+ Kc7 21. Nxa7)) 8. Ne4 Nxd4 ({HH:} 8... Rd7 9. d6+ Rxd6 10. Nxd6 Kxd6 11. Rc5 Nxd4 12. Re5 Kc6 13. Nc1 Kd6 14. Re8 Nc6 15. Rxe2 Ne5 16. Re4 Kd5 17. Rb4 Ke6 18. Rb7 Nxg4 19. Rxa7 Kd5 20. Rxa6) 9. Rc4 Nf5 ({HH:} 9... Nf3 10. Nc3 e1=Q (10... Kd8 11. Nxe2 Nd2 12. Rc2 Ne4 13. Nd4) 11. Nxe1 Ne5 12. Rd4 Rb8 13. d6+ Ke6 14. Nd3 Nxg4 15. Nc5+ Ke5 16. Rd5+ Kf4 17. d7 Nf6 18. d8=Q Rxd8 19. Rxd8 g4 20. Rd3 Kf5 21. Nxa6 Bf4 22. Ne2 Ne4 23. Rd5+ Be5 24. Nb4 Ke6 25. Kb5 g3 26. Kc6 Nc3 27. Rxe5+ Kxe5 28. Nxc3) (9... Nb5 10. Nec5 Rc7 11. Kb4 Kd6 12. a4 Nc3 13. Rxc3 Kxd5 14. Rc4 Re7 15. Ne1) (9... Nb3 10. Nc3 Nd2 11. Rc6 Rb3 12. d6+ Kd8 13. Rc7 Rxc3 14. Rxc3 Kd7 15. Kb4 Kxd6 16. Rc2) 10. gxf5 gxf5 11. d6+ Kd8 12. Nec5 Rb5 13. Rc2 e1=Q 14. Nxe1 g4 15. Nxa6 Rd5 ({HH:} 15... Re5 16. Rc7 Rd5 17. Nc5 Rxd6 18. Rxa7 Rd5 19. Ne6+ Kc8 20. a6 Be3 21. Rc7+ Kb8 22. Rxg7 Rd6 23. Rg8+ Ka7 24. Nc7 Rd7 25. Rc8 Kb6 26. Nc2 Bf2 27. Nb4 Rxc7 28. Nd5+ Kxa6 29. Rxc7 g3 30. Rg7) 16. Nc5 Be3 17. Nb7+ Ke8 18. Re2 f4 19. Ng2) 5. Nxg6 Nb5 ({HH:} 5... hxg6 6. Rxc2 Rxc2 7. Nxc2 Nb5 8. Kb4 Nxd4 9. Ne1 Nf5 10. Nc4 Nd4 11. Ne5) 6. Rxc2 Rxc2 7. Nxc2 Nc3+ (7... Nxd4 8. Ne1) 8. Kb3 Nxd5 9. Nf3 hxg6 10. Kc4 Nf6 11. Ne5) (1... Ke7 2. fxe8=Q+ Kxe8 3. Nxd2 Rxb2 {+100} (3... Nxe5 {+100} 4. dxe5 Rxb2 5. Nb3 Rf6 ( 5... Ke7 6. Kb4) 6. exf6 gxf6 7. Rxc2 Rxc2 8. Nxc2 f5 9. gxf5 g4 (9... Ke7 10. Kb4 Kd6 11. Kc4 Ke5 12. Nc1 ({HH} 12. Nc5 g4 13. Nd3+ Kxf5 14. d6 e1=Q 15. Nd4+ Ke4 16. Nxe1 Bg7 17. d7 Bf6 18. Nc6 h5 19. Kc5 Bg5 20. Kd6 Bf4+ 21. Ke7 g3 22. Ng2 Bc7 23. Nd8 Bxa5 24. Ne6 Kf3 25. Nh4+ Kg4 26. Kd6 Kxh4 27. Nc7) 12... Bf8 13. Nxe2 h5 14. Kd3 Kxd5 15. Ne3+ Ke5 16. Nd4) 10. Nbd4 Bg5 11. Nxe2 h5 12. Nb4 h4 13. Nxa6 g3 14. Nc7+ Kf7 15. Kb5 g2 16. Ne6 Be7 17. Ng1) (3... Rd6 {+100 HH} 4. Nec4 Rxd5 5. Nxc2 Nf6 6. Nb4 Re7 7. Nf3 Rd8 8. Nce5 g6 9. Nbc6 Rc8 10. Nxe7 Rxc1 11. Bxc1 Kxe7 12. Kb3 Ne4 13. Kc4 Bg7 14. Kd3 Bxe5 15. Kxe4 Bg3 16. Bxg5+ Ke6 17. Bd2) 4. Nxg6 hxg6 5. Nd3 Rb5 ({HH:} 5... Rb7 6. Rxc2 Nf6 7. d6 Kd8 8. Nf3 Ne8 9. Nc5 Rb1 10. d7 Nf6 11. Rxe2 Nxd7 12. Re6 Nxc5+ 13. dxc5) ({HH:} 5... Rb8 6. Rxc2 Nf6 7. Nc4 e1=Q 8. Nxe1 Nxg4 9. Nd3 Nf6 10. d6 g4 11. Re2+ Kf8 12. Nc5 g3 13. Rg2 Kg8 14. d7 Nxd7 15. Nxd7 Rd8 16. Nce5 Bf4 17. Kb3 Bxe5 18. Nxe5 Rxd4 19. Rxg3) 6. Rxc2 Nf6 7. Nb3 e1=Q 8. Nxe1 Nxg4 ({HH:} 8... Rxd5 9. Rg2 Kf7 10. Nf3 Rd6 11. Nc5 Kg8 12. Kb3 Ne8 13. Kc4 Rf6 14. Ne5) 9. Nc5 ({HH:} 9. Rc8+ Kd7 10. Ra8 Kd6 11. Rxa7 Kxd5 12. Nc2 Nf6 13. Nb4+ Ke4 14. Nxa6 Rf5 15. Nac5+ Kf3 16. Rf7 g4 17. a6 g3 18. a7 g2 19. a8=Q+ Kg3 20. Rxf6 gxf6 21. Ne4+ (21. Qe8 Bg5 22. Ne4+ Kg4 23. Nxg5 g1=Q 24. Ne4 Kh3 25. Nec5 g5 26. Qe6 Qg4 27. Kb5 Qf3 28. Nd2 Qd5 29. Qe3+ Kh4 30. Nde4 Qb7+ 31. Kc4 Qd5+ 32. Kb4 Rf4 33. a4 Kh5 34. a5 Kg6 35. Qd3 Kh6 36. a6 Qd8 37. Kc4 Qg8+ 38. Kc3 Qd8 39. Qh3+ Kg6 40. Qe6 Rf1 41. Nb3 Rf3+ 42. Kc4 Qc7+ 43. Nec5 Rf2 44. d5) 21... Kh3 22. Qh8 g1=Q 23. Qxh6+ Rh5) 9... Ke7 10. Re2+ Kd6 11. Ned3 Nf6 (11... Kxd5 12. Nb4+ Kc4 13. Ncxa6 Rf5 14. Nc7 Nf6 15. d5 Nd7 16. Re4+ Kc3 17. Re7 Nc5+ 18. Kb5 Nb3 19. Ne6) 12. Nb4 Rxb4+ 13. axb4 g4 14. Nxa6 Nxd5 15. Rg2 Ne3 16. Rg1 Bf4 17. b5 g3 18. Nc5) (1... Nc7 2. Nxd2 {+100} Nxd5 ({HH} 2... Rxb2 3. N1d3 Nxd5 4. Nxb2 Nf8 ( 4... Ne3 5. Ne4+ Ke7 6. Nxd7 Kxf7 7. Ne5+ Ke6 8. Nxg6 hxg6 9. Kb3 Nxg4 10. Kxc2 ) 5. Ndf3 Ne3 6. Kb3 Ke6 7. Nbc4 (7. d5+ $5 Kxd5 8. Nxg6 Nxg6) 7... Nxc4 8. Kxc4 Rf6 9. Rxc2 e1=Q 10. Nxe1 Nd7 11. N1d3 $1 (11. Nxd7 $5 Kxd7 12. Nd3 Kd6 13. Ne5 Rf1 14. Rb2 g6 15. Rb7 Rc1+ 16. Kd3 Rd1+ 17. Ke3 Re1+ 18. Kd2 Ra1 19. Rxa7 Kd5 20. Rd7+ Ke4 21. Nc4) 11... Nxe5+ 12. dxe5 Rxf7 13. Kd4 g6 14. Rc6+ Ke7 15. Nc5 Bf8 16. Rc7+ Ke8 17. Rc8+ Ke7 18. Ra8 Rf3 19. Kd5 h5 20. Rxa7+ Ke8 21. Nxa6 Kd8 22. Nc7 Rd3+ 23. Kc4 Rxa3 24. Nd5 hxg4 25. e6) 3. Nxd7+ Kxf7 4. Ne5+ Kg8 5. Rxc2 Rf6 6. Ne4 Rf4 7. Bc1 Rf1 8. Rxe2 g6 9. N1d3 Bf8 10. Rc2 Rc7 11. Nec5 h6 12. Bd2 Rd1 13. Nb4 Nxb4 14. axb4 Bd6 15. Bc3 Rg1 16. Nxa6 Bxe5 17. dxe5 Rc8 18. Bd4 Rxc2 19. Bxg1 h5 20. Bxa7 h4 21. e6 h3 22. Bb8) ({HH:} 1... Rb8 2. Nxd2 Rxb2 3. Rxc2 Ke7 4. fxe8=Q+ Kxe8 5. Rxb2 Rd6 6. Nxd7 Kxd7 7. Ndf3 Rxd5 8. Rxe2) 2. fxe8=Q $1 Qxd4+ 3. Nc4 Nc5+ 4. Nxc5 Rb4+ 5. axb4 1-0