Solution Steps:

1. Row 1 / Column 3 → 2 (Hidden Single)
2. Row 6 / Column 8 → 7 (Hidden Single)
3. Row 4 / Column 8 → 2 (Hidden Single)
4. Row 7 / Column 2 → 2 (Hidden Single)
5. Row 4 / Column 5 → 8 (Hidden Single)
6. Locked Candidates Type 1 (Pointing): 4 in b1 => r2c46<>4
7. Locked Candidates Type 1 (Pointing): 1 in b3 => r789c7<>1
8. Locked Candidates Type 1 (Pointing): 9 in b6 => r5c1356<>9
9. Row 4 / Column 3 → 9 (Hidden Single)
10. Row 4 / Column 2 → 6 (Hidden Single)
11. Locked Candidates Type 1 (Pointing): 4 in b4 => r5c56<>4
12. Locked Candidates Type 1 (Pointing): 5 in b4 => r5c56<>5
13. Locked Candidates Type 1 (Pointing): 7 in b7 => r23c3<>7
14. Locked Candidates Type 2 (Claiming): 7 in r1 => r23c9,r3c7<>7
15. Naked Pair: 1,5 in r57c1 => r139c1<>1
16. Row 1 / Column 7 → 1 (Hidden Single)
17. Row 1 / Column 9 → 7 (Hidden Single)
18. Naked Triple: 6,8,9 in r358c7 => r7c7<>9, r9c7<>6, r9c7<>8
19. Hidden Rectangle: 2/3 in r5c56,r9c56 => r9c6<>3
20. AIC: 1 1- r3c3 =1= r3c2 =7= r3c6 =3= r3c5 =5= r7c5 -5- r7c1 -1 => r789c3<>1
21. Locked Candidates Type 2 (Claiming): 1 in r9 => r8c46<>1
22. Discontinuous Nice Loop: 8 r2c9 -8- r2c8 -9- r7c8 -1- r7c1 -5- r7c5 =5= r3c5 -5- r3c9 =5= r2c9 => r2c9<>8
23. Grouped Discontinuous Nice Loop: 9 r2c6 =7= r3c6 =3= r3c5 =5= r7c5 =9= r13c5 -9- r2c6 => r2c6<>9
24. Grouped Discontinuous Nice Loop: 9 r3c6 =3= r3c5 =5= r7c5 =9= r13c5 -9- r3c6 => r3c6<>9
25. Grouped Discontinuous Nice Loop: 3 r7c5 -3- r7c9 -9- r7c8 -1- r7c1 =1= r5c1 -1- r6c2 -3- r6c4 =3= r89c4 -3- r7c5 => r7c5<>3
26. Almost Locked Set XZ-Rule: A=r7c15789 {134579}, B=r9c4567 {12347}, X=7, Z=3 => r9c9<>3
27. Row 7 / Column 9 → 3 (Hidden Single)
28. Naked Pair: 6,8 in r9c19 => r9c3<>6
29. 2-String Kite: 6 in r3c7,r9c1 (connected by r8c7,r9c9) => r3c1<>6
30. W-Wing: 9/8 in r3c1,r5c9 connected by 8 in r9c19 => r3c9<>9
31. W-Wing: 8/9 in r2c8,r5c7 connected by 9 in r25c9 => r3c7<>8
32. Discontinuous Nice Loop: 9 r3c5 -9- r3c1 -8- r9c1 -6- r9c9 =6= r8c7 -6- r3c7 -9- r3c5 => r3c5<>9
33. Naked Triple: 3,5,7 in r23c6,r3c5 => r2c4<>5
34. AIC: 6 6- r1c1 -9- r1c5 =9= r7c5 -9- r7c8 -1- r7c1 =1= r8c2 =8= r9c1 =6= r8c3 -6 => r23c3,r9c1<>6
35. Row 2 / Column 3 → 4 (Naked Single)
36. Row 3 / Column 3 → 1 (Naked Single)
37. Row 9 / Column 1 → 8 (Naked Single)
38. Row 3 / Column 1 → 9 (Naked Single)
39. Row 9 / Column 9 → 6 (Naked Single)
40. Row 1 / Column 1 → 6 (Naked Single)
41. Row 3 / Column 7 → 6 (Naked Single)
42. Row 8 / Column 3 → 6 (Hidden Single)
43. Row 5 / Column 2 → 4 (Hidden Single)
44. Row 2 / Column 4 → 6 (Hidden Single)
45. Locked Candidates Type 1 (Pointing): 5 in b7 => r7c5<>5
46. Row 3 / Column 5 → 5 (Hidden Single)
47. Row 2 / Column 6 → 7 (Naked Single)
48. Row 3 / Column 9 → 8 (Naked Single)
49. Row 2 / Column 2 → 8 (Naked Single)
50. Row 3 / Column 2 → 7 (Full House)
51. Row 3 / Column 6 → 3 (Full House)
52. Row 2 / Column 8 → 9 (Naked Single)
53. Row 2 / Column 9 → 5 (Full House)
54. Row 5 / Column 9 → 9 (Full House)
55. Row 5 / Column 7 → 8 (Full House)
56. Row 7 / Column 8 → 1 (Naked Single)
57. Row 8 / Column 8 → 8 (Full House)
58. Row 8 / Column 7 → 9 (Naked Single)
59. Row 7 / Column 1 → 5 (Naked Single)
60. Row 5 / Column 1 → 1 (Full House)
61. Row 8 / Column 6 → 5 (Naked Single)
62. Row 7 / Column 3 → 7 (Naked Single)
63. Row 5 / Column 6 → 2 (Naked Single)
64. Row 6 / Column 2 → 3 (Naked Single)
65. Row 5 / Column 3 → 5 (Full House)
66. Row 9 / Column 3 → 3 (Full House)
67. Row 5 / Column 5 → 3 (Full House)
68. Row 8 / Column 2 → 1 (Full House)
69. Row 8 / Column 4 → 3 (Full House)
70. Row 4 / Column 6 → 4 (Naked Single)
71. Row 4 / Column 4 → 5 (Full House)
72. Row 7 / Column 7 → 4 (Naked Single)
73. Row 7 / Column 5 → 9 (Full House)
74. Row 9 / Column 7 → 7 (Full House)
75. Row 9 / Column 6 → 1 (Naked Single)
76. Row 6 / Column 6 → 9 (Full House)
77. Row 6 / Column 4 → 1 (Full House)
78. Row 1 / Column 5 → 4 (Naked Single)
79. Row 1 / Column 4 → 9 (Full House)
80. Row 9 / Column 4 → 4 (Full House)
81. Row 9 / Column 5 → 2 (Full House)