[d]4k3/7K/8/8/p4ppp/4pprb/1NBprpn1/4bqnR w - - 0 1
Can White win here?
Yes it looks messy, but we can't judge positions by their appearance
![Very Happy :D](./images/smilies/icon_biggrin.gif)
Moderators: hgm, Rebel, chrisw
YADKWBO (yet another driving King with Bishop only) variation?
On the other hand, having tried some more in the meantime, I don't see how Black's King can be prevented from escaping always to one of the black coloured edges a1 or h8, where no mate seems to be possible to me at white coloured squares nearby.peter wrote: ↑Tue Jun 29, 2021 9:51 am Guidance has to be to h5 or a8, then taking two steps with Knight, to e4, if it's h5 or to b5, if it's a8, Black's King is at then, thus cutting the only escape- fields uncovered by white King. Between these two final Knight-moves promotion of black d-Pawn doesn't matter anymore and Bishop can mate on one of these two white fields, a8 or h5. Right?
Oops, wrong starting position with Chest after 2.Nd1?
Good parameters of yours. I had P2 only, rest 0, with your setting 2'36" at my hardware too.Ignacio wrote: ↑Wed Jun 30, 2021 12:46 am FEN: 4k3/7K/8/8/p4ppp/4pprb/1NBprpn1/4bqnR w - - 0 1
Chest 5.2:
FEN: 4k3/7K/8/8/p4ppp/4pprb/1NBprpn1/4bqnR w - - (4+16)
Position-Analysis: C0/R0/K6/P3/X10 W:4/20
Search for 1. Special-Mate [C6/R0/K0/P2/X8] in 52 ... (Hash=2044MB)
52 01:27 112.638.348 1.307.240 +M52 Ac2xa4+
Search completed ... (Time=87.47s)
Mate in 52 found ! (1. Solution in 01:27)
52/52 01:27 114.350.384 1.307.235 +M52 Ac2xa4+ Re8-f8 Aa4-d1 Rf8-f7 Cb2-a4 Rf7-f6 Ca4-c5 Rf6-f7 Cc5-b3 Rf7-f6 Rh7-h6 Rf6-f7 Rh6-g5 Rf7-e6 Rg5-g6 Re6-e5 Rg6-f7 Re5-d6 Rf7-f6 Rd6-d5 Rf6-f5 Rd5-d6 Rf5-e4 Rd6-c6 Re4-d4 Rc6-b5 Rd4-d5 Rb5-b4 Cb3-a1 Rb4-b5 Ca1-c2 Rb5-b6 Cc2-d4 Rb6-b7 Rd5-c5 Rb7-a6 Cd4-c6 Ra6-b7 Cc6-d8+ Rb7-b8 Cd8-e6 Rb8-a7 Rc5-b5 Ra7-b7 Th1-h2 Rb7-a7 Ce6-c5 Ra7-b8 Rb5-b6 Rb8-c8 Th2-h1 Rc8-b8 Cc5-d7+ Rb8-c8 Rb6-c6 Rc8-d8 Cd7-b6 Rd8-e7 Rc6-d5 Re7-e8 Rd5-d6 Re8-d8 Th1-h2 Rd8-e8 Cb6-c8 Re8-f8 Cc8-e7 Rf8-e8 Ce7-c6 Re8-f7 Cc6-d4 Rf7-f8 Rd6-e6 Rf8-e8 Cd4-c6 Re8-f8 Cc6-a5 Rf8-e8 Ca5-b7 Re8-f8 Cb7-d6 Rf8-g7 Re6-e7 Rg7-g6 Th2-h1 Rg6-g7 Cd6-f5+ Rg7-g8 Th1-h2 Rg8-h8 Re7-f7 Rh8-h7 Cf5-d6 Rh7-h8 Th2-h1 Rh8-h7 Ad1-c2+ Rh7-h6 Rf7-f6 d2-d1D Cd6-f7+ Rh6-h5 Ac2-g6+
Can you be sure #52 is the shortest?peter wrote: ↑Tue Jun 29, 2021 11:52 pmOops, wrong starting position with Chest after 2.Nd1?
After restart from original position, Chest right now said #52:
4k3/7K/8/8/p4ppp/4pprb/1NBprpn1/4bqnR w - -
Engine: ChestUCI Ver.5.2 (0 MB)
von Franz Huber
52.00 66:39 +M52 1.Lxa4+ Kf8 2.Ld1 Kf7 3.Sa4 Kf6
4.Sc5 Kf7 5.Sb3 Kf6 6.Kh6 Kf7 7.Kg5 Ke6
8.Kg6 Ke5 9.Kf7 Kd6 10.Kf6 Kd5
11.Kf5 Kd6 12.Ke4 Kc6 13.Kd4 Kb5
14.Kd5
Pasting output- lines once and again till mate is reached:
[pgn][Event "?"]
[Site "?"]
[Date "2021.06.29"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "4k3/7K/8/8/p4ppp/4pprb/1NBprpn1/4bqnR w - -"]
1. Bxa4+ Kf8 2. Bd1 Kf7 3. Na4 Kf6 4. Nc5 Kf7 5. Nb3 Kf6
6. Kh6 Kf7 7. Kg5 Ke6 8. Kg6 Ke5 9. Kf7 Kd6 10. Kf6 Kd5
11. Kf5 Kd6 12. Ke4 Kc6 13. Kd4 Kb5 14. Kd5 Kb4 15. Na1 Kb5
16. Nc2 Kb6 17. Nd4 Kb7 18. Kc5 Ka6 19. Nc6 Kb7 20. Nd8+
Kb8 21. Ne6 Ka7 22. Kb5 Kb7 23. Rh2 Ka7 24. Nc5 Kb8 25. Kb6
Kc8 26. Rh1 Kb8 27. Nd7+ Kc8 28. Kc6 Kd8 29. Nb6 Ke7
30. Kd5 Ke8 31. Kd6 Kd8 32. Rh2 Ke8 33. Nc8 Kf8 34. Ne7 Ke8
35. Nc6 Kf7 36. Nd4 Kf8 37. Ke6 Ke8 38. Nc6 Kf8 39. Na5 Ke8
40. Nb7 Kf8 41. Nd6 Kg7 42. Ke7 Kg6 43. Rh1 Kg7 44. Nf5+
Kg8 45. Rh2 Kh8 46. Kf7 Kh7 47. Nd6 Kh8 48. Rh1 Kh7
49. Bc2+ Kh6 50. Kf6 d1=Q 51. Nf7+ Kh5 52. Bg6# *[/pgn]
Simply was too fixed on the YADKWBO (yet another driving King with Bishop only), should have tried the Driving King with Knight only instead, woe is me!
Congrats, Hobacle, you fooled me again regards
![]()
I've just found that there's only one solution of #52 so it's almost certainly the shortest.
[d]4k2K/8/8/8/p4ppp/4pprb/1NBprpn1/4bqnR w - -