Vortex Lite -
with thanks to Para for helping me see step 36:
Prelims:
a) 8(2) N2 = {17/26/35}
b) 20(3) N2: no 1,2
c) 28(4) @ r2c9 = {4789/5689} -> r12c8 <> 8,9
d) 7(2) N4 = {16/25/34}
e) 21(3) @ r5c3 = {489/579/678}
f) 11(3) @ r4c7: no 9
g) 11(2) @ r4c9 = {29/38/47/56}
h) 19(3) @ r6c5: no 1
i) 15(2) r9c56 = {69/78}
j) 22(3) N9 = {589/679} -> 9 n/e N9 and D\
k) 13(4) @ r8c6 = {1237/1246/1345} must have 1 -> r8c9 <> 1
1. Outies D\: r4c6 + r6c4 = 15 = {69/78}
2. Outies D/: r4c4 + r6c6 = 7 = {16/25/34}
-> r5c5 = 23 - 15 - 7 = 1
-> r4c4, r6c6 <> 6, r6c1 <> 6, r1c4 <> 7
-> 12(3) = {237/246/345} (no 8,9)
3. Outies N1: r2c4 + r4c1 = 10 = {19/28/37/46/55}
4. Outies N3: r1c6 + r4c8 = 13 = {49/58/67}
5. Outies N7: r6c2 + r9c4 = 4 = {13/22}
6. Outies N9: r8c6 + r6c9 = 5 = {14/23}
7. Outies r123: r4c158 = 20 - > r4c1 <> 1,2; r4c5 <> 2 -> r2c4 <> 8,9
8. Outies r789: r6c259 = 13 Max from r6c29 = 3+4 = 7 -> r6c5 min 6
9. Outies c123: r259c4 = 11 -> r5c4 <> 9 Min from r59c4 = 4+1 = 5 -> r2c4 max 6 -> r4c1 min 4
10. Outies c789: r158c6 = 10 = {127/136/145/235} (r1c6 <> 8,9) -> r4c8 <> 45
Min from r18c6 = 4+1 = 5 -> r5c6 max 5
Combos: [451/523/532/541/631/721] -> r8c6 <> 4 -> r6c9 <> 1
11. Innies N5: r46c5 + r5c46 = 22 = {2569/2578/3469/3478}
12. Killer combo 13(4) @ r8c6 and 22(3) N9:
22(3) = {589/679}
13(4) = {1237/1246/1345} -> one of 5,6,7 within N9
-> 15(4) @ r6c9 <> 5 -> 15(4) = {1248/1347/2346}
13. O-I N2: r1c6 + r2c4 - r4c5 = 3
14. O-I N4: r4c1 + r6c2 - r5c4 = 3
15. O-I N6: r4c8 + r6c9 - r5c6 = 8
16. O-I N8: r8c6 + r9c4 - r6c5 = -4 -> r6c5 - (r8c6+r9c4) = 4 -> r6c5 <> 6
17. HS r8c6 = 1 -> r6c9 = 4 -> r5c1 <> 3, r45c9 <> 7, r4c4 <> 3
-> If 28(4) = {4789}, r3c8 = 4 -> r3c8 <> 7
18. HS r7c9 = 1
19. r6c5 = (78) -> r4c6 + r6c4 = {69} n/e D/, N5
20. 12(3) N3 = {237/345} -> 3 n/e D/, N3 -> 17(3) N7 = {278/458} -> 8 n/e N7
21. Split 11(3) r259c4 = [182/173/452/542] -> r2c4 <> 2,3,6 -> r4c1 <> 4,7,8
22. 11(3) @ r4c7 = {128/137/146/236/245}
Combo analysis: r5c6 <> 5 -> r1c6 <> 4, r4c7 <> 7,8
-> r4c8 <> 9
23. 9 locked to 28(4) within N3 -> r12c7 <> 9
-> 9 locked to r1c23 n/e N1 -> 19(4) = 9{127/136/145/235} -> r1c23, r2c3 <> 8
24. 8 locked to r1c17 -> r7c7 <> 8
25. Killer combo: r7c8+r8c9 = {28/37}, 22(3) N9 = {589/679} -> r8c7, r9c78 <> 7
26. Grouped Turbot (1): r1c8 = r6c8 - r6c1 = r23c1 -> r1c23 <> 1
27. Grouped Turbot (8): r1c1 = r1c7 - r23c9 = r34c8 -> r8c8 <> 8 -> r9c9 <> 5
28. Combo analysis split 20(3) r4c158 -> r4c1 <> 6 -> r2c4 <> 4
-> split 11(3) r259c4 = [182/173/542] -> r5c4 <> 5
29. Grouped x-wing: 8 locked to r7c8, r89c9 in N9; 8 locked to 28(4) within c89
-> r45c9, r56c8 <> 8 -> r45c9 <> 3
30. If 28(4) = {4789} r4c8 = 7 -> r23c9 <> 7 (Can't have both 47 within N3 since 12(3) must have one of 4,7)
31. Killer combo: 11(2) r45c9 = {29/56}, r23c9 (of 28(4)) = {56/58/89} ({68} not possible in r45c9 as neither 5 or 9 in r4c8) Must have one of 5,9
-> r9c9 <> 9, r1c9 <> 5
32. From step 13, r4c5 <> 7 as can’t make 10 from r1c6 + r2c4
33. 1 locked to 18(4) within N3 -> 18(4) = 1{278/458/467}
If {1458}, r1c6 = 5 -> r1c78, r2c7 <> 5
34. Grouped Turbot (9): r4c6 = r6c4 - r6c7 = r7c7 -> r7c6 <> 9 -> r7c5 <> 2,3
35. Pointing pair: 7 in either r5c4 or r6c5 -> r6c3 <> 7
So near and yet so far. Don't know why I couldn't see the next step before.
36. 12(3) N3 = {237} ({345} would block both options for 28(4) which must have one of 4,5 within N3.) -> 2,7 n/e N3 and D/
-> 17(3) N7 = {458} -> 4,5 n/e N7
37. Split 20(3) r4c158 = {389/479/578} ({569} not possible because r4c6 = {69} -> r4c8 <> 6
Andrew noted: r1c6 <> 7 as well
38. 17(4) @ r6c2 = {1367} (only remaining combo)
-> r6c2 = 1 -> r9c4 = 3, r9c3 = 1, r8c3+r9c2 = {29}
39. r6c5 = 8 (from O-I N8) -> r5c4 = 7 -> r2c4 = 1 -> r4c1 = 9
...
Relatively straightforward from here with cage combos and singles.
Phew!
I'll leave Mike's original Vortex for the Masters!
Now off to follow Para's WT for the A66 V1.5 before tomorrow's A67!