Outskirts CheSS ForuM

Post by **timetraveller** » 25/02/2023, 15:18

by Gustavus C. Reichhelm 1879

white to move #64:

there probably won't be many engines to solve the puzzle

solution:

► Show Spoiler

Peter Grayson · Post by **Peter Grayson** » 26/02/2023, 17:59

Certainly difficult for engines but on analysis it becomes clear why. Mainly because Black has several pawn move options that lead to different mating lines. For example, after 25.Qc4, Black can also play 25..c5 and ..h4 as alternatives to 25..g2.

After capturing the easy pickings the question then was how does White force the Black pawn moves that allows White to capture them too? Once the triangulation pattern is identified, Qc4+ Kb1, Qe4+ Ka2, Qe6+ Kb1, Qc4 it quickly becomes clear that Black is forced into moving a pawn and when it gets to an appropriate White square it can be captured whilst ensuring Black cannot escape the eventual mate.

Stockfish 20230224 suggested the 25..h4 line may be #66 not #64 but uncler on the precision of the Stockfish indicated mate depths.

Peter

[Event "?"]
[Site "?"]
[Date "2023.02.26"]
[Round "?"]
[White "Mate in 64"]
[Black "?"]
[Result "*"]
[Annotator "Grayson,Peter"]
[SetUp "1"]
[FEN "6n1/2p5/r6p/3Q1b1p/2K5/p1b1p1p1/kp3p2/q4r1n w - - 0 1"]
[PlyCount "127"]
[SourceDate "2023.02.26"]
[SourceVersionDate "2023.02.26"]

{[#]} 1. Kxc3+ Kb1 2. Qxf5+ Ka2 3. Qf7+ Kb1 4. Qh7+ Ka2 5. Qxg8+ Kb1 6. Qh7+
Ka2 7. Qf7+ Kb1 8. Qf5+ Ka2 9. Qd5+ Kb1 10. Qd3+ Ka2 11. Qc4+ Kb1 12. Qxf1+ Ka2
13. Qc4+ Kb1 14. Qe4+ Ka2 15. Qd5+ Kb1 16. Qxh1+ Ka2 17. Qd5+ Kb1 18. Qd3+ Ka2
19. Qc4+ Kb1 20. Qxa6 Ka2 21. Qe6+ Kb1 22. Qc4 c6 (22... h4) 23. Qe4+ Ka2 24.
Qe6+ Kb1 25. Qc4 g2 (25... c5 {Stockfish dev-20230224-472e726b :} 26. Qd3+ Ka2
27. Qd5+ Kb1 28. Qc4 h4 29. Qe4+ Ka2 30. Qd5+ c4 31. Qxc4+ Kb1 32. Qd3+ Ka2 33.
Qd5+ Kb1 34. Qc4 g2 35. Qd3+ Ka2 36. Qd5+ Kb1 37. Qxg2 Ka2 38. Qg8+ Kb1 39. Qc4
h3 40. Qe4+ Ka2 41. Qe6+ Kb1 42. Qxh3 Ka2 43. Qe6+ Kb1 44. Qc4 h5 45. Qe4+ Ka2
46. Qd5+ Kb1 47. Qc4 h4 48. Qe4+ Ka2 49. Qe6+ Kb1 50. Qc4 h3 51. Qe4+ Ka2 52.
Qe6+ Kb1 53. Qxh3 Ka2 54. Qe6+ Kb1 55. Qc4 e2 56. Qxe2 Ka2 57. Qe6+ Kb1 58. Qc4
f1=Q 59. Qxf1+ Ka2 60. Qc4+ Kb1 61. Qd5 Qa2 62. Qh1# {[%eval 32694,136]}) (
25... h4 26. Qe4+ Ka2 27. Qe6+ Kb1 28. Qe4+ Ka2 29. Qe6+ Kb1 30. Qc4 g2 (30...
h5 31. Qe4+ {#36} ({Stockfish dev-20230224-472e726b :} 31. Qe4+ Ka2 32. Qe6+
Kb1 33. Qc4 g2 34. Qe4+ Ka2 35. Qe6+ Kb1 36. Qg6+ Ka2 37. Qg8+ Kb1 38. Qxg2 Ka2
39. Qg8+ Kb1 40. Qc4 c5 41. Qd3+ Ka2 42. Qd5+ Kb1 43. Qc4 h3 44. Qe4+ Ka2 45.
Qe6+ Kb1 46. Qxh3 Ka2 47. Qe6+ Kb1 48. Qc4 h4 49. Qe4+ Ka2 50. Qe6+ Kb1 51. Qc4
h3 52. Qe4+ Ka2 53. Qe6+ Kb1 54. Qxh3 c4 55. Qf1+ Ka2 56. Qxc4+ Kb1 57. Qe4+
Ka2 58. Qe6+ Kb1 59. Qc4 e2 60. Qxe2 Ka2 61. Qc4+ Kb1 62. Kd2 f1=Q 63. Qxf1+
Ka2 64. Qf7+ Kb1 65. Qc4 Qa2 66. Qf1# {[%eval 32696,129]}) 31... Ka2 32. Qe6+
Kb1 33. Qc4 h3 ({Stockfish dev-20230224-472e726b :} 33... g2 34. Qe4+ Ka2 35.
Qe6+ Kb1 36. Qg6+ Ka2 37. Qg8+ Kb1 38. Qxg2 Ka2 39. Qg8+ Kb1 40. Qc4 h3 41.
Qe4+ Ka2 42. Qe6+ Kb1 43. Qxh3 Ka2 44. Qe6+ Kb1 45. Qc4 h4 46. Qe4+ Ka2 47.
Qe6+ Kb1 48. Qc4 c5 49. Qe4+ Ka2 50. Qe6+ Kb1 51. Qc4 h3 52. Qe4+ Ka2 53. Qe6+
c4 54. Qxc4+ Kb1 55. Qe4+ Ka2 56. Qe6+ Kb1 57. Qxh3 Ka2 58. Qe6+ Kb1 59. Qc4
f1=R 60. Qxf1+ Ka2 61. Qf7+ Kb1 62. Qc4 e2 63. Qxe2 Ka2 64. Qe6+ Kb1 65. Kd2
Qa2 66. Qe1# {[%eval 32702,127]}) 34. Qe4+ Ka2 35. Qe6+ Kb1 36. Qxh3 Ka2 37.
Qe6+ Kb1 38. Qc4 c5 (38... h4 39. Qe4+ Ka2 40. Qe6+ Kb1 41. Qc4 g2 {Stockfish
dev-20230224-472e726b :} 42. Qe4+ Ka2 43. Qe6+ Kb1 44. Qg6+ Ka2 45. Qg8+ Kb1
46. Qxg2 Ka2 47. Qg8+ Kb1 48. Qc4 c5 49. Qd3+ Ka2 50. Qd5+ Kb1 51. Qc4 h3 52.
Qe4+ Ka2 53. Qe6+ c4 54. Qxc4+ Kb1 55. Qe4+ Ka2 56. Qe6+ Kb1 57. Qxh3 Ka2 58.
Qe6+ Kb1 59. Qc4 f1=R 60. Qxf1+ Ka2 61. Qc4+ Kb1 62. Qb5 Ka2 63. Qb3+ Kb1 64.
Kd3 e2 65. Kxe2 Qa2 66. Qd1# {[%eval 32718,132]}) 39. Qe4+ Ka2 40. Qe6+ Kb1 41.
Qc4 h4 42. Qe4+ Ka2 43. Qe6+ c4 (43... Kb1 44. Qc4 h3 {Stockfish
dev-20230224-472e726b :} 45. Qe4+ Ka2 46. Qe6+ Kb1 47. Qxh3 Ka2 48. Qe6+ c4 49.
Qxc4+ Kb1 50. Qa6 Ka2 51. Qe6+ Kb1 52. Qc4 e2 53. Qxe2 Ka2 54. Qe6+ Kb1 55. Qc4
g2 56. Qe4+ Ka2 57. Qd5+ Kb1 58. Qxg2 Ka2 59. Qg8+ Kb1 60. Qc4 f1=N 61. Qxf1+
Ka2 62. Qf7+ Kb1 63. Qd5 Qa2 64. Qh1# {[%eval 32728,129]}) 44. Qxc4+ Kb1 45.
Qe4+ Ka2 46. Qe6+ Kb1 47. Qc4) (30... h3 31. Qe4+ Ka2 32. Qe6+ Kb1 33. Qxh3 Ka2
34. Qe6+ Kb1 {Stockfish dev-20230224-472e726b :} 35. Qc4 g2 36. Qe4+ Ka2 37.
Qe6+ Kb1 38. Qg6+ Ka2 39. Qg8+ Kb1 40. Qxg2 Ka2 41. Qg8+ Kb1 42. Qc4 c5 43.
Qe4+ Ka2 44. Qd5+ c4 45. Qxc4+ Kb1 46. Qe4+ Ka2 47. Qd5+ Kb1 48. Qc4 h5 49.
Qe4+ Ka2 50. Qe6+ Kb1 51. Qc4 h4 52. Qe4+ Ka2 53. Qe6+ Kb1 54. Qc4 h3 55. Qe4+
Ka2 56. Qe6+ Kb1 57. Qxh3 Ka2 58. Qe6+ Kb1 59. Qc4 f1=R 60. Qxf1+ Ka2 61. Qf7+
Kb1 62. Qc4 e2 63. Qxe2 Ka2 64. Qe6+ Kb1 65. Qc4 Qa2 66. Qf1# {[%eval 32704,
127]}) 31. Qe4+ Ka2 32. Qe6+ Kb1 33. Qf5+ ({Stockfish dev-20230224-472e726b :} 
33. Qg6+ Ka2 34. Qg8+ Kb1 35. Qxg2 Ka2 36. Qg8+ Kb1 37. Qc4 h3 38. Qe4+ Ka2 39.
Qe6+ Kb1 40. Qxh3 Ka2 41. Qe6+ Kb1 42. Qc4 c5 43. Qe4+ Ka2 44. Qd5+ c4 45.
Qxc4+ Kb1 46. Qe4+ Ka2 47. Qe6+ Kb1 48. Qc4 h5 49. Qb5 Ka2 50. Qd5+ Kb1 51. Qc4
h4 52. Qe4+ Ka2 53. Qe6+ Kb1 54. Qc4 h3 55. Qe4+ Ka2 56. Qe6+ Kb1 57. Qxh3 Ka2
58. Qe6+ Kb1 59. Qc4 f1=R 60. Qxf1+ Ka2 61. Qf7+ Kb1 62. Qc4 e2 63. Qxe2 Ka2
64. Qe6+ Kb1 65. Qc4 Qa2 66. Qf1# {[%eval 32700,146]}) 33... Ka2 34. Qf7+ Kb1
35. Qg6+ ({Stockfish dev-20230224-472e726b :} 35. Qh7+ Ka2 36. Qg8+ Kb1 37.
Qxg2 Ka2 38. Qg8+ Kb1 39. Qc4 h3 40. Qe4+ Ka2 41. Qe6+ Kb1 42. Qxh3 Ka2 43.
Qe6+ Kb1 44. Qc4 c5 45. Qe4+ Ka2 46. Qd5+ c4 47. Qxc4+ Kb1 48. Qe4+ Ka2 49.
Qe6+ Kb1 50. Qc4 h5 51. Qd3+ Ka2 52. Qd5+ Kb1 53. Qc4 h4 54. Qe4+ Ka2 55. Qe6+
Kb1 56. Qc4 h3 57. Qe4+ Ka2 58. Qe6+ Kb1 59. Qxh3 Ka2 60. Qe6+ Kb1 61. Qc4 e2
62. Qxe2 Ka2 63. Qc4+ Kb1 64. Kd2 f1=Q 65. Qxf1+ Ka2 66. Qf7+ Kb1 67. Kc3 Qa2
68. Qf1# {[%eval 32700,139]}) 35... Ka2 36. Qg8+ Kb1 37. Qxg2 Ka2 38. Qg8+ Kb1
39. Qc4 h3 (39... h5 {Stockfish dev-20230224-472e726b :} 40. Qe4+ Ka2 41. Qe6+
Kb1 42. Qc4 h3 43. Qe4+ Ka2 44. Qe6+ Kb1 45. Qxh3 Ka2 46. Qe6+ Kb1 47. Qc4 c5
48. Qe4+ Ka2 49. Qd5+ c4 50. Qxc4+ Kb1 51. Qe4+ Ka2 52. Qe6+ Kb1 53. Qc4 h4 54.
Qe4+ Ka2 55. Qd5+ Kb1 56. Qc4 h3 57. Qe4+ Ka2 58. Qe6+ Kb1 59. Qxh3 Ka2 60.
Qe6+ Kb1 61. Qc4 f1=R 62. Qxf1+ Ka2 63. Qf7+ Kb1 64. Qc4 e2 65. Qxe2 Ka2 66.
Qe6+ Kb1 67. Qc4 Qa2 68. Qf1# {[%eval 32710,109]}) (39... c5 {Stockfish
dev-20230224-472e726b :} 40. Qe4+ Ka2 41. Qd5+ Kb1 42. Qc4 h3 43. Qe4+ Ka2 44.
Qe6+ Kb1 45. Qxh3 Ka2 46. Qe6+ c4 47. Qxc4+ Kb1 48. Qe4+ Ka2 49. Qd5+ Kb1 50.
Qc4 h5 51. Qd3+ Ka2 52. Qd5+ Kb1 53. Qc4 h4 54. Qb5 Ka2 55. Qd5+ Kb1 56. Qc4 h3
57. Qe4+ Ka2 58. Qe6+ Kb1 59. Qxh3 Ka2 60. Qe6+ Kb1 61. Qc4 f1=R 62. Qxf1+ Ka2
63. Qf7+ Kb1 64. Qc4 e2 65. Qxe2 Ka2 66. Qe6+ Kb1 67. Qc4 Qa2 68. Qf1# {
[%eval 32710,118]}) 40. Qe4+ Ka2 41. Qe6+ Kb1 42. Qxh3 Ka2 43. Qe6+ Kb1 44. Qc4
h5 {Stockfish dev-20230224-472e726b :} 45. Qe4+ Ka2 46. Qe6+ Kb1 47. Qc4 c5 48.
Qd3+ Ka2 49. Qd5+ c4 50. Qxc4+ Kb1 51. Qe4+ Ka2 52. Qd5+ Kb1 53. Qc4 h4 54.
Qd3+ Ka2 55. Qd5+ Kb1 56. Qc4 h3 57. Qe4+ Ka2 58. Qe6+ Kb1 59. Qxh3 Ka2 60.
Qe6+ Kb1 61. Qc4 f1=N 62. Qxf1+ Ka2 63. Qf7+ Kb1 64. Qc4 e2 65. Qxe2 Ka2 66.
Qe6+ Kb1 67. Qc4 Qa2 68. Qf1# {[%eval 32720,131]}) (25... e2 26. Qxe2 Ka2 27.
Qe6+ Kb1 28. Qe4+ Ka2 {Stockfish dev-20230224-472e726b :} 29. Qe6+ Kb1 30. Qc4
h4 31. Qe4+ Ka2 32. Qe6+ Kb1 33. Qc4 h5 34. Kd2 c5 35. Kc3 h3 36. Qe4+ Ka2 37.
Qe6+ c4 38. Qxc4+ Kb1 39. Qe4+ Ka2 40. Qe6+ Kb1 41. Qxh3 Ka2 42. Qe6+ Kb1 43.
Qc4 h4 44. Kd2 h3 45. Qe4+ Ka2 46. Qe6+ Kb1 47. Qxh3 Ka2 48. Qe6+ Kb1 49. Qc4
g2 50. Qd3+ Ka2 51. Qd5+ Kb1 52. Qxg2 Ka2 53. Qd5+ Kb1 54. Qc4 f1=Q 55. Qxf1+
Ka2 56. Qf7+ Kb1 57. Qb3 Qa2 58. Qd1# {[%eval 32708,122]}) 26. Qe4+ ({
Stockfish dev-20230224-472e726b :} 26. Qe4+ Ka2 27. Qe6+ Kb1 28. Qg6+ Ka2 29.
Qg8+ Kb1 30. Qxg2 Ka2 31. Qg8+ Kb1 32. Qc4 c5 33. Qe4+ Ka2 34. Qd5+ Kb1 35. Qc4
h4 36. Qe4+ Ka2 37. Qd5+ Kb1 38. Qc4 h3 39. Qe4+ Ka2 40. Qe6+ c4 41. Qxc4+ Kb1
42. Qe4+ Ka2 43. Qe6+ Kb1 44. Qxh3 Ka2 45. Qe6+ Kb1 46. Qc4 h5 47. Qe4+ Ka2 48.
Qe6+ Kb1 49. Qc4 h4 50. Qe4+ Ka2 51. Qe6+ Kb1 52. Qc4 h3 53. Qe4+ Ka2 54. Qe6+
Kb1 55. Qxh3 Ka2 56. Qe6+ Kb1 57. Qc4 e2 58. Qxe2 Ka2 59. Qe6+ Kb1 60. Qc4 f1=Q
61. Qxf1+ Ka2 62. Qf7+ Kb1 63. Qc4 Qa2 64. Qf1# {[%eval 32690,144]}) 26... Ka2
27. Qe6+ Kb1 28. Qg6+ Ka2 29. Qg8+ Kb1 30. Qxg2 Ka2 31. Qg8+ Kb1 32. Qc4 h4 33.
Qe4+ Ka2 34. Qe6+ Kb1 35. Qc4 ({Stockfish dev-20230224-472e726b :} 35. Qc4 h3
36. Qe4+ Ka2 37. Qe6+ Kb1 38. Qxh3 Ka2 39. Qe6+ Kb1 40. Qc4 h5 41. Qe4+ Ka2 42.
Qe6+ Kb1 43. Qc4 c5 44. Qe4+ Ka2 45. Qe6+ Kb1 46. Qc4 h4 47. Qd3+ Ka2 48. Qd5+
Kb1 49. Qc4 h3 50. Qe4+ Ka2 51. Qe6+ c4 52. Qxc4+ Kb1 53. Qe4+ Ka2 54. Qe6+ Kb1
55. Qxh3 Ka2 56. Qe6+ Kb1 57. Qc4 e2 58. Qxe2 Ka2 59. Qc4+ Kb1 60. Kd2 f1=Q 61.
Qxf1+ Ka2 62. Qf7+ Kb1 63. Qc4 Qa2 64. Qf1# {[%eval 32708,117]}) 35... h5 (
35... h3 {Charisma Diamond-bmi2:} 36. Qe4+ Ka2 37. Qe6+ Kb1 38. Qxh3 Ka2 39.
Qe6+ Kb1 40. Qc4 h5 41. Qe4+ Ka2 42. Qe6+ Kb1 43. Qc4 h4 44. Qe4+ Ka2 45. Qe6+
Kb1 46. Qc4 c5 47. Qe4+ Ka2 48. Qe6+ Kb1 49. Qc4 h3 50. Qe4+ Ka2 51. Qe6+ c4
52. Qxc4+ Kb1 53. Qe4+ Ka2 54. Qe6+ Kb1 55. Qxh3 Ka2 56. Qe6+ Kb1 57. Qc4 f1=Q
58. Qxf1+ Ka2 59. Qf7+ Kb1 60. Qc4 e2 61. Qxe2 Ka2 62. Qe6+ Kb1 63. Kd2 Qa2 64.
Qe1# {[%eval 32710,110]}) (35... c5 {Charisma Diamond-bmi2:} 36. Qe4+ Ka2 37.
Qd5+ Kb1 38. Qc4 h3 39. Qe4+ Ka2 40. Qe6+ c4 41. Qxc4+ Kb1 42. Qe4+ Ka2 43.
Qe6+ Kb1 44. Qxh3 Ka2 45. Qe6+ Kb1 46. Qc4 h5 47. Qe4+ Ka2 48. Qd5+ Kb1 49. Qc4
h4 50. Qe4+ Ka2 51. Qd5+ Kb1 52. Qc4 h3 53. Qe4+ Ka2 54. Qe6+ Kb1 55. Qxh3 Ka2
56. Qe6+ Kb1 57. Qc4 f1=Q 58. Qxf1+ Ka2 59. Qf7+ Kb1 60. Qc4 e2 61. Qxe2 Ka2
62. Qc4+ Kb1 63. Kd2 Qa2 64. Qf1# {[%eval 32710,97]}) 36. Qe4+ Ka2 37. Qe6+ Kb1
38. Qc4 h3 {Charisma Diamond-bmi2:} 39. Qe4+ Ka2 40. Qe6+ Kb1 41. Qxh3 Ka2 42.
Qe6+ Kb1 43. Qc4 h4 44. Qe4+ Ka2 45. Qe6+ Kb1 46. Qc4 c5 47. Qe4+ Ka2 48. Qe6+
Kb1 49. Qc4 h3 50. Qe4+ Ka2 51. Qe6+ c4 52. Qxc4+ Kb1 53. Qe4+ Ka2 54. Qe6+ Kb1
55. Qxh3 Ka2 56. Qe6+ Kb1 57. Qc4 f1=Q 58. Qxf1+ Ka2 59. Qf7+ Kb1 60. Qc4 e2
61. Qxe2 Ka2 62. Qe6+ Kb1 63. Qc4 Qa2 64. Qf1# {[%eval 32716,102]} *

Post by **timetraveller** » 26/02/2023, 18:20

and i am total impressed Peter, that the puzzle is from 1879 and black still (cool idea) has all chess pieces

unfortunately, there is no information about how long it took for the composer to create this puzzle...
once more: WOW-i am (still) total stunned...

Peter Grayson · Post by **Peter Grayson** » 27/02/2023, 14:51

timetraveller wrote: ↑26/02/2023, 18:20 and i am total impressed Peter, that the puzzle is from 1879 and black still (cool idea) has all chess pieces
unfortunately, there is no information about how long it took for the composer to create this puzzle...
once more: WOW-i am (still) total stunned...

The study also highlights a potential improvement for the Stockfish code.

Using Multipv=4 for example confirms the engine recognises capturing the Knight with 5.Qxg8+ does not lose the draw option but because there is no element to assign more value to material recovery the engine still scores the position as 0.0, the same as Qf7+ with no material recovery. I suspect most players finding this situation would play for the material recovery ensuring the draw is still avalable even if the mate is too distant to recognise. Unfortunately then the engine would play 5.Qf7+ instead of 1.Qxg8+. That theme seems to prevail through the full move progression

3: Mate in 64

Analysis by Stockfish dev-20230224-472e726b :
Depth 156 ply

1. = (0.00): 5.Qf7+ Kb1 6.Qf5+ Ka2 7.Qd5+ Kb1
2. = (0.00): 5.Qxg8+ Kb1 6.Qh7+ Ka2 7.Qf7+ Kb1 8.Qf5+ Ka2 9.Qf7+
3. -+ (-#5): 5.Kc4 Rc1+ 6.Kd5 Rd6+ 7.Ke5 b1Q+ 8.Kf4 f1Q+ 9.Kxe3 Qf2#
4. -+ (-#5): 5.Qc2 Rc1 6.Kd4 Rxc2 7.Ke4 b1Q 8.Kd3 Qb4 9.Kxc2 Qab1#

after 25..g2 Stockfish does indicate #39 confirming #64 with that move

3: Mate in 64

Analysis by Stockfish dev-20230224-472e726b :

1. +- (#39): 26.Qe4+ Ka2 27.Qe6+ Kb1 28.Qg6+ Ka2 29.Qg8+ Kb1 30.Qxg2 Ka2 31.Qg8+ Kb1 32.Qc4 c5 33.Qe4+ Ka2 34.Qd5+ c4 35.Qxc4+ Kb1 36.Qd3+ Ka2 37.Qd5+ Kb1 38.Qc4 h4 39.Qe4+ Ka2 40.Qe6+ Kb1 41.Qc4 h3 42.Qe4+ Ka2 43.Qe6+ Kb1 44.Qxh3 Ka2 45.Qe6+ Kb1 46.Qc4 h5 47.Qd3+ Ka2 48.Qd5+ Kb1 49.Qc4 h4 50.Qe4+ Ka2 51.Qe6+ Kb1 52.Qc4 h3 53.Qe4+ Ka2 54.Qe6+ Kb1 55.Qxh3 e2 56.Qd3+ Ka2 57.Qc4+ Kb1 58.Qxe2 Ka2 59.Qe6+ Kb1 60.Qc4 f1Q 61.Qxf1+ Ka2 62.Qf7+ Kb1 63.Qc4 Qa2 64.Qf1#
2. +- (#41): 26.Qd3+ Ka2 27.Qc4+ Kb1 28.Qe4+ Ka2 29.Qe6+ Kb1 30.Qg6+ Ka2 31.Qg8+ Kb1 32.Qxg2 Ka2 33.Qg8+ Kb1 34.Qc4 c5 35.Qe4+ Ka2 36.Qd5+ c4 37.Qxc4+ Kb1 38.Qd3+ Ka2 39.Qd5+ Kb1 40.Qc4 h4 41.Qe4+ Ka2 42.Qe6+ Kb1 43.Qc4 h3 44.Qe4+ Ka2 45.Qe6+ Kb1 46.Qxh3 Ka2 47.Qe6+ Kb1 48.Qc4 h5 49.Qd3+ Ka2 50.Qd5+ Kb1 51.Qc4 h4 52.Qe4+ Ka2 53.Qe6+ Kb1 54.Qc4 h3 55.Qe4+ Ka2 56.Qe6+ Kb1 57.Qxh3 e2 58.Qd3+ Ka2 59.Qc4+ Kb1 60.Qxe2 Ka2 61.Qe6+ Kb1 62.Qc4 f1Q 63.Qxf1+ Ka2 64.Qf7+ Kb1 65.Qc4 Qa2 66.Qf1#
3. = (0.00): 26.Qa4 f1Q 27.Qe4+ Ka2 28.Qe6+ Kb1

(Grayson, Newport, South Wales 27.02.2023)

Peter

Outskirts CheSS ForuM

Outskirts CheSS ForuM

#64

#64

Re: #64

Re: #64

Re: #64