15x(2) @ r1c3={35} (NP @ r1)
16x(3) @ r1c6={128|[242|414]}
28x(3) @ r3c4={147|[722]}
=> r3c45 from {1247} can't be {12}
=> 20+(3) @ r1c5 can't be {479}, can't have 4
=> 20+(3) @ r1c5={389|569|578} has 3|5
=> r1c4 & 20+(3) form KNP {35} @ n2
3/(2) @ r2c6 from {1246789}={26} (NP @ c6,n2)
=> 20+(3) @ r1c5={389|578} (8 @ n2 locked)
=> r1c6+r3c45={147} (NT @ n2)
=> 20+(3) @ r1c5={389} (NT @ n2)
=> 15x(3) @ r1c3=[35]
Outies @ n1: r4c1=3
=> 15x(2) @ r3c9=[35]
Innies @ n3: r12c79=21
But 2-(2) @ r12c9 must be even
=> r12c7 must be odd, can't be {28}
=> r1c6 can't be 1, must be 4
=> 16x(3) @ r1c6=[414]
=> 13+(2) @ r1c1 from {26789}={67} (NP @ r1,n1)
=> r2c79=21-1-4=16=[97]
=> r1c58=[82], r3c45={17}
=> 28x(3) @ r3c4: r4c4=28/1/7=4
Now r2c4 from {39}, r3c4 from {17}
=> 6-(2) @ r7c4 can't be {17|39}, must be {28} (NP @ c4,n8)
=> 24x(3) @ r8c5 from {1345679} must be {146}
=> r8c6=1, r89c5={46} (NP @ c5,n8)
=> min r7c56=3+5=8
13+(3) @ r6c6: max r6c6=13-8=5
Innie-outies @ n6: r4c6=r6c9+2
=> r4c6+r6c9=[86]
=> 13+(3) @ r4c6: r45c7=13-8=5 from {23789}=[23]
=> 13+(2) @ r6c7 from {14789}=[94]
Innies @ n5: r6c46=8=[35]
=> r29c4=[97], 8+(3) @ r5c3: r56c3=8-3=5=[41]
13+(3) @ r6c6: r7c56=13-5=8 from {359}=[53]
=> 1-(2) @ r9c6=[98]
Innie-outies @ n9: 1-/2 @ r9c8=r6c9-1=6-1=5=[32]
15+(3) @ r8c3: r89c3=15-7=8 from {256789}=[26]
Innies @ n4: 15+(2) @ r6c1=[78]
Innies @ n7: 4-(2) @ r8c1=14=[95]
All naked singles from here.