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Here is a chess problem I've made that has an illegal position. The board is from White’s view and White’s d1 pawn moves normally. Have fun!

White moves and mates in 19 moves

enter image description here

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Same basic idea as Barsloai, but refined a bit to actually achieve mate in 19. All of black's lines should be accounted for.

[FEN "5brb/4p1p1/3pPpPp/3p3P/7p/5PpP/PP4Pp/3P1K1k w - - 0 1"]
1. b4 f5 {Black can move pawns in a different order, but it won't matter.}
2. b5 f4
3. b6 d4
4. b7 d5
5. b8=Q d3
6. Qb2 d4
7. a4 d2 {d2 cannot be the last pawn move, so d2 must have been made by this point regardless of move order.}
8. Qxd2 d3 {Last pawn move; variations have collapsed.}
9. Ke1 Kg1
10. Qxd3 h1=Q (10... Kh1 11. Qf1#)
11. Qf1+ Kh2
12. Qxh1+ Kxh1
13. Kf1 Kh2
14. a5 Kh1
15. a6 Kh2
16. a7 Kh1
17. a8=Q Kh2
18. Qa7 Kh1
19. Qg1#

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I thin this. should work. Excuse me for not knowing exactly how to describe chess move in English as normally I do it in my native tongue-hopefully you'll understand

1. b4, d4 2. b5, d3 3. b6, d2 4. b7, d5 5. b8=Q, d4 6. Qb2, d3 7. Q:d2, f5 8. Ke1, f4 9. Qb1, d2 10. Q:d2, Kg1 11. Qe2, h1>Q 12. Qf1+, Kh2 13. Q:h1, K:h1 14. Kf1, Kh2 15. a4, Kh1 16. a5, Kh2 17. a6, Kh1 18. a7, Kh2 19. a8>Q, Kh1 20. Qa7, kh2 21. Qg1 #

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  • $\begingroup$ Darn, I can't seem to be able to make it into a spoiler, sorry, advices will be welcomed $\endgroup$ – Barsloai May 21 '20 at 4:38
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    $\begingroup$ I've edited your answer, so now it's a spoiler. Good work! $\endgroup$ – trolley813 May 21 '20 at 9:29
  • $\begingroup$ Thanks for editing buddy, I appreciate it $\endgroup$ – Barsloai May 21 '20 at 13:20

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