Variant Puzzle #1

Notes: This thread does not fit into the Position Workshop / Testing Thread, because Red is guaranteed a win with optimal play.

If there was a place for creating this type of content, or if this type of content does not belong here, then I apologize for creating a new topic for this. This topic can be deleted (or locked) if this is the case.

I created this position, in which the rules are CTK, Crazyhouse, Any Capture, Passing, and 13th = N (the rank where the dead green archbishop is). Each side's royals are the kings (on n8 and a6 respectively). Every turn, Yellow has no choice but to pass. Red moves up the board.

Question 1. Can Red mate Yellow, and if so, what is the shortest line in which Red mates? (The shortest line still hasn't been found.)

Question 2 (for those that responded to question 1). If the dead pawn on l13 was removed, how long is Red's mating sequence now?

(Please do not reply with a comment partially responding to the questions like "Yes, Red can mate": please add an example line to prove your claims.)

Edits: Specified CTK rule and specified royals. Changed to 4pc to prevent Black/Dark Green problems. Added part 2.

what is black's royal?

It is possible but I will not post it yet because I am on mobile right now. My solution is about 50 moves long.

A bit longer because promoted berolina won't be dropped as a knight so has to go after archbishop

Try it in this order:

Dabbaba .. Ferz .. Alfil .. King .. Berolina .. =Knight .. Archbishop .. Chancellor .. Camel

this is literally a series-mover but variant

passing doesn't need to exist because seriesmovers are actual puzzles in chess

Wow challenging what about 50 move rule does that exist here?

captures reset the 50-move rule :kekw:

By the way, a 52-move solution is possible in question 1.

In question 2, the strategy for the fastest mate slightly changes with respect to that in question 1.

Modified shrunk version, promotion to knight on the 9th rank

Maybe sub-ideal, but I have a 76-move solution:

1. Wf9xg9 .. Kc3xc4
2. Wg9xg8 .. Kc4-c3
3. Wg8xh8 .. Kc3-c4
4. Wh8xh7 .. Kc4-c3
5. Wh7xh6 .. Kc3-c4
6. @rP-f9 .. Kc4-c3
7. f9xSe10 .. Kc3-c4
8. Wh6xi6 .. Kc4-c3
9. Wi6-h6 .. Kc3-c4
10. @rS-i6 .. Kc4-c3
11. Si6xFi4 .. Kc3-c4
12. @rF-f9 .. Kc4-c3
13. Ff9xe10 .. Kc3-c4
14. Wh6-h7 .. Kc4-c3
15. Fe10-f9 .. Kc3-c4
16. Ff9-g8 .. Kc4-c3
17. Fg8xWh7 .. Kc3-c4
18. Fh7-i6 .. Kc4-c3
19. Si4xFi6 .. Kc3-c4
20. @rF-i4 .. Kc4-c3
21. Fi4xh3 .. Kc3-c4
22. Fh3-i4 .. Kc4-c3
23. @rW-h3 .. Kc3-c4
24. Wh3xIg3 .. Kc4-c3
25. Wg3-h3 .. Kc3-c4
26. Fi4xWh3 .. Kc4-c3
27. Fh3-i4 .. Kc3-c4
28. Si6xFi4 .. Kc4-c3
29. Si4-i6 .. Kc3-c4
30. @rI-h8 .. Kc4-c3
31. Ih8xf6 .. Kc3-c4
32. If6xd8 .. Kc4-c3
33. Id8-f6 .. Kc3-c4
34. @rF-d8 .. Kc4-c3
35. Fd8xc9 .. Kc3-c4
36. If6-d8 .. Kc4-c3
37. Fc9xId8 .. Kc3-c4
38. @rW-h6 .. Kc4-c3
39. Wh6xSi6 .. Kc3-c4
40. @rS-c9 .. Kc4-c3
41. Sc9xc11 .. Kc3-c4
42. Fd8-c9 .. Kc4-c3
43. Sc11xFc9 .. Kc3-c4
44. @rF-c11 .. Kc4-c3
45. Fc11xd12 .. Kc3-c4
46. Sc9-c11 .. Kc4-c3
47. Fd12xSc11 .. Kc3-c4
48. @rS-d12 .. Kc4-c3
49. Sd12xf12 .. Kc3-c4
50. Sf12xh12 .. Kc4-c3
51. Sh12xj12 .. Kc3-c4
52. Sj12-h12 .. Kc4-c3
53. @rI-j12 .. Kc3-c4
54. Ij12xl10 .. Kc4-c3
55. Sh12-j12 .. Kc3-c4
56. Il10xSj12 .. Kc4-c3
57. @rS-c9 .. Kc3-c4
58. Sc9xFc11 .. Kc4-c3
59. @rF-h7 .. Kc3-c4
60. Fh7xWi6 .. Kc4-c3
61. @rW-l10 .. Kc3-c4
62. Wl10xk10 .. Kc4-c3
63. Wk10-l10 .. Kc3-c4
64. @rP-k10 .. Kc4-c3
65. k10xl11=N .. Kc3-c4
66. Nl11xk9 .. Kc4-c3
67. Nk9xj7 .. Kc3-c4
68. Nj7-h8 .. Kc4-c3
69. Nh8-f9 .. Kc3-c4
70. Nf9-d8 .. Kc4-c3
71. Nd8xc6 .. Kc3-c4
72. Nc6-d8 .. Kc4-c3
73. Nd8-e10 .. Kc3-c4
74. Ne10xSc11 .. Kc4-c3
75. @rS-c6 .. Kc3-c4

76. Sc6xKc4#S

LOL I missed something

I meant 9th rank on the pictured board, 11th on 14x14. I missed that with passing on red cannot win.

In the original puzzle red doesn't need a chancellor to get a camel

It is caused by 'promotedFrom' variable, delete it in PGN4 (if you delete it in FEN4 it will reappear)

Yeah, if yellow had a ferz then WxF would be the last move