Hard to find mate

glav · Post by **glav** » Mon Nov 28, 2022 1:32 pm

This mate problem was posted a while ago on the internet, with no details given about the number of moves to the checkmate. I tried Stockfish, ChestUCI and Cristal on it, with no success. Anyone with bigger hardware and/or more competent than me willing to try?

[fen]6Q1/8/8/8/8/7k/ppp1p3/brrbK3 w - - 0 1[/fen]

Jouni · Post by **Jouni** » Mon Nov 28, 2022 1:37 pm

Analysis by The Huntsman 1:

...
1.Qg1 Kh4 2.Qg2 Kh5 3.Qg3 Kh6 4.Qg4 Kh7 5.Qe6 Kg7 6.Qxa2 Kh6 7.Qd5
+- (#37) Depth: 13/13 00:00:00 3kN
1.Qg1 Kh4 2.Qg2 Kh5 3.Qg3 Kh6 4.Qg4 Kh7 5.Qe6 Kg7 6.Qxa2 Kh6 7.Qd5 Kg6
+- (#37) Depth: 14/14 00:00:00 4kN
1.Qg1 Kh4 2.Qg2 Kh5 3.Qg3 Kh6 4.Qg4 Kh7 5.Qe6 Kg7 6.Qxa2 Kh6 7.Qd5 Kg6 8.Qe5
+- (#37) Depth: 15/15 00:00:00 4kN
1.Qg1 Kh4 2.Qg2 Kh5 3.Qg3 Kh6 4.Qg4 Kh7 5.Qe6 Kg7 6.Qxa2 Kh6 7.Qd5 Kg6 8.Qe5 Kh6
+- (#37) Depth: 16/16 00:00:00 5kN
1.Qg1 Kh4 2.Qg2 Kh5 3.Qg3 Kh6 4.Qg4 Kh7 5.Qe6 Kg7 6.Qxa2 Kh6 7.Qd5 Kg6 8.Qe5 Kh6 9.Qf5
+- (#37) Depth: 17/17 00:00:00 5kN
1.Qg1 Kh4 2.Qg2 Kh5 3.Qg3 Kh6 4.Qg4 Kh7 5.Qe6 Kg7 6.Qxa2 Kh6 7.Qd5 Kg6 8.Qe5 Kh6 9.Qf5 Kg7
+- (#38) Depth: 18/18 00:00:00 6kN

glav · Post by **glav** » Mon Nov 28, 2022 1:50 pm

Brilliant! Thank you. Do you have more info about this astonishing engine? Thanks again.

Ignacio · Post by **Ignacio** » Mon Nov 28, 2022 2:12 pm

glav wrote: ↑Mon Nov 28, 2022 1:32 pm This mate problem was posted a while ago on the internet, with no details given about the number of moves to the checkmate. I tried Stockfish, ChestUCI and Cristal on it, with no success. Anyone with bigger hardware and/or more competent than me willing to try?

[fen]6Q1/8/8/8/8/7k/ppp1p3/brrbK3 w - - 0 1[/fen]

Chest (K4/P1/X3) needs 0 seconds for mate in 37.
Ignacio

glav · Post by **glav** » Mon Nov 28, 2022 2:17 pm

Thanks. Could you share the parmeters you used for Chest? Is it version 5.2?

Spliffjiffer · Post by **Spliffjiffer** » Mon Nov 28, 2022 2:21 pm

glav wrote: ↑Mon Nov 28, 2022 1:32 pm This mate problem was posted a while ago on the internet, with no details given about the number of moves to the checkmate. I tried Stockfish, ChestUCI and Cristal on it, with no success. Anyone with bigger hardware and/or more competent than me willing to try?

[fen]6Q1/8/8/8/8/7k/ppp1p3/brrbK3 w - - 0 1[/fen]

Chest finds t in around 0.2 sec:

Code: Select all

FEN: 6Q1/8/8/8/8/7k/ppp1p3/brrbK3 w - - 0 1

ChestUCI:
FEN: 6Q1/8/8/8/8/7k/ppp1p3/brrbK3 w - - (2+9)
Stellungs-Analyse: C0/R0/K3/P1/X2 W:2/23
Suche nach 1. Spezial-Matt [C2/R0/K4/P0/X0] in 37 ... (Hash=2044MB)
 37	00:00	 0	0	+M37	1.Dg8-g1
Suche abgeschlossen ... (Zeit=0.22s)
Matt in 37 gefunden ! (1. Lösung in 00:00)
 37/37	00:00	 364k	1.664k	+M37	1.Dg8-g1 Kh3-h4 2.Dg1-g2 Kh4-h5 3.Dg2-g3 Kh5-h6 4.Dg3-g4 Kh6-h7 5.Dg4-g5 Kh7-h8 6.Dg5-e7 Kh8-g8 7.De7-a7 Kg8-h8 8.Da7xa2 Kh8-h7 9.Da2-f7+ Kh7-h8 10.Df7-f8+ Kh8-h7 11.Df8-f6 Kh7-g8 12.Df6-h6 Kg8-f7 13.Dh6-g5 Kf7-f8 14.Dg5-g6 Kf8-e7 15.Dg6-f5 Ke7-e8 16.Df5-f6 Ke8-d7 17.Df6-e5 Kd7-d8 18.De5-e6 Kd8-c7 19.De6-d5 Kc7-c8 20.Dd5-d6 Kc8-b7 21.Dd6-c5 Kb7-a8 22.Dc5-b5 Ka8-a7 23.Db5-d5 Ka7-b8 24.Dd5-c6 Kb8-a7 25.Dc6-c8 Ka7-b6 26.Dc8-d7 Kb6-a6 27.Dd7-c7 Ka6-b5 28.Dc7-d6 Kb5-a5 29.Dd6-c6 Ka5-b4 30.Dc6-d5 Kb4-a4 31.Dd5-c4+ Ka4-a5 32.Dc4-b3 Ka5-a6 33.Db3-b8 Ka6-a5 34.Db8-b7 Ka5-a4 35.Db7-b6 Ka4-a3 36.Db6-b5 Ka3-a2 37.Db5-a4+

glav · Post by **glav** » Mon Nov 28, 2022 2:27 pm

Thank you. As I said, I found Chest parametrization a little complicated. May be that was the reason why I didn't succeed. Could you please share the search parameters you used?

Spliffjiffer · Post by **Spliffjiffer** » Mon Nov 28, 2022 2:40 pm

glav wrote: ↑Mon Nov 28, 2022 2:27 pm Thank you. As I said, I found Chest parametrization a little complicated. May be that was the reason why I didn't succeed. Could you please share the search parameters you used?

ure welcome but never underestimate perfection

...(not sure if this is perfect oc)

Code: Select all

FEN: 8/8/8/8/8/7k/ppp1p3/brrbK1Q1 b - - 1 1

ChestUCI:
FEN: 6Q1/8/8/8/8/7k/ppp1p3/brrbK3 w - - (2+9)
Stellungs-Analyse: C0/R0/K3/P1/X2 W:2/23
Suche nach 1. Spezial-Matt [C2/R0/K0/P0/X0] in 37 ... (Hash=2044MB)
 36	00:00	 0	0	+M36	1.Dg8-g1
Suche abgeschlossen ... (Zeit=0.59s)
Matt in 36 gefunden ! (1. Lösung in 00:00)
 36/36	00:00	 659k	1.127k	+M36	1.Dg8-g1 Kh3-h4 2.Dg1-g2 Kh4-h5 3.Dg2-g3 Kh5-h6 4.Dg3-g4 Kh6-h7 5.Dg4-e6 Kh7-g7 6.De6xa2 Kg7-g6 7.Da2-d5 Kg6-h7 8.Dd5-f7+ Kh7-h8 9.Df7-f8+ Kh8-h7 10.Df8-f6 Kh7-g8 11.Df6-h6 Kg8-f7 12.Dh6-g5 Kf7-f8 13.Dg5-g6 Kf8-e7 14.Dg6-f5 Ke7-e8 15.Df5-f6 Ke8-d7 16.Df6-e5 Kd7-d8 17.De5-e6 Kd8-c7 18.De6-d5 Kc7-c8 19.Dd5-d6 Kc8-b7 20.Dd6-c5 Kb7-a8 21.Dc5-b5 Ka8-a7 22.Db5-d5 Ka7-b8 23.Dd5-c6 Kb8-a7 24.Dc6-c8 Ka7-b6 25.Dc8-d7 Kb6-a6 26.Dd7-c7 Ka6-b5 27.Dc7-d6 Kb5-c4 28.Dd6-e5 Kc4-b4 29.De5-e7+ Kb4-c4 30.De7-d6 Kc4-c3 31.Dd6-d5 Kc3-b4 32.Dd5-c6 Kb4-b3 33.Dc6-c5 Kb3-a2 34.Dc5-d5+ Ka2-a3 35.Dd5-b5 Ka3-a2 36.Db5-a4+

Spliffjiffer · Post by **Spliffjiffer** » Mon Nov 28, 2022 3:01 pm

edit:
the parameters are always given in my posts above (look carefully) ...as for the #36 they were: "Suche nach 1. Spezial-Matt [C2/R0/K0/P0/X0] in 37"
ps: extremely unlikely that that there does exist a shorter solution imho !!?

peter · Post by **peter** » Mon Nov 28, 2022 3:33 pm

Spliffjiffer wrote: ↑Mon Nov 28, 2022 3:01 pm edit:
the parameters are always given in my posts above (look carefully) ...as for the #36 they were: "Suche nach 1. Spezial-Matt [C2/R0/K0/P0/X0] in 37"
ps: extremely unlikely that that there does exist a shorter solution imho !!?

Yes, rather unlikely, Peer

BTW, the C2 param isn't necessary neither, as it seems.
I had Chest and SlowChess backwarding Chest's #36- line togehter, wherever SlowChess wanted to have a detour I did let Chest help to find the shorter way:

6Q1/8/8/8/8/7k/ppp1p3/brrbK3 w - -

Engine: SlowChess Blitz 2.9 avx20 (32768 MB)
von Jonathan Kreuzer

56/73 2:30 +M36 1.Dg1 Kh4 2.Dg2 Kh5 3.Dg3 Kh6 4.Dg4 Kh7
5.De6 Kg7 6.Dxa2 Kh6 7.Da5 Kg6 8.De5 Kh6
9.Df5 Kg7 10.Dh5 Kf6 11.Dg4 Kf7
12.Dg5 Ke6 13.Dg6+ Kd5 14.Df5+ (4.552.517.942) 30283

Here's the whole line of SlowChess' extended to mate:

[pgn][Event "?"]
[Site "?"]
[Date "2022.11.28"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "6Q1/8/8/8/8/7k/ppp1p3/brrbK3 w - -"]

1. Qg1 Kh4 2. Qg2 Kh5 3. Qg3 Kh6 4. Qg4 Kh7 5. Qe6 Kg7
6. Qxa2 Kh6 7. Qa5 Kg6 8. Qe5 Kh6 9. Qf5 Kg7 10. Qh5 Kf6
11. Qg4 Kf7 12. Qg5 Ke6 13. Qg6+ Kd5 14. Qf5+ Kd6 15. Qf6+
Kd7 16. Qe5 Kd8 17. Qe6 Kc7 18. Qd5 Kc8 19. Qd6 Kb7 20. Qc5
Ka8 21. Qb5 Ka7 22. Qd5 Kb8 23. Qc6 Ka7 24. Qc8 Kb6 25. Qd7
Ka6 26. Qc7 Kb5 27. Qd6 Kc4 28. Qe5 Kd3 29. Qf4 Kc3 30. Qe4
Kb3 31. Qd4 Ka3 32. Qd6+ Kb3 33. Qc5 Ka4 34. Qb6 Ka3
35. Qb5 Ka2 36. Qa4# *[/pgn]

Engine: ChestUCI Ver.5.2 (0 MB)
von Franz Huber

FEN: 6Q1/8/8/8/8/7k/ppp1p3/brrbK3 w - - (2+9)
Stellungs-Analyse: C0/R0/K3/P1/X2 W:2/23
Suche nach 1. Spezial-Matt [C0/R0/K0/P1/X0] in 36 ... (Hash=2044MB)
Suche abgeschlossen ... (Zeit=0.97s)
36.14 0:00 +M36 1.Dg1
Matt in 36 gefunden ! (1. Lösung in 00:00)
36/36 0:00 +M36 1.Dg1 Kh4 2.Dg2 Kh5 3.Dg3 Kh6 4.Dg4 Kh7 5.De6 Kg7 6.Dxa2 Kg6 7.Dd5 Kh7 8.Df7+ Kh8 9.Df8+ Kh7 10.Df6 Kg8 11.Dh6 Kf7 12.Dg5 Kf8 13.Dg6 Ke7 14.Df5 677
Bester Zug: Dg8-g1 Zeit: 2:09.453 min K/s: 677.326 Knoten: 659.716

Hard to find mate

Hard to find mate

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Re: Hard to find mate