Solving Script
Hell 20

Hidden single 5 in row 7  (r7c7=5)
   r1c7<>5
   r2c7<>5
   r4c7<>5
   r5c7<>5
   r6c7<>5
   r7c7<>1
   r7c7<>3
   r7c7<>4
   r7c7<>6
   r7c7<>9
Hidden single 2 in row 8  (r8c5=2)
   r1c5<>2
   r2c5<>2
   r4c5<>2
   r5c5<>2
   r6c5<>2
   r8c5<>1
   r8c5<>6
   r8c5<>8
   r8c5<>9
Hidden single 4 in box 9  (r9c8=4)
   r2c8<>4
   r3c8<>4
   r9c3<>4
   r9c8<>1
   r9c8<>6
   r9c8<>9
Hidden double row 8 - 78
   r8c2<>1
   r8c2<>3
   r8c2<>9
   r8c3<>3
   r8c3<>6
   r8c3<>9
   r9c3<>8
Hidden single 1 in col 2  (r7c2=1)
   r7c2<>3
   r7c2<>4
   r7c2<>9
   r7c4<>1
Hidden single 1 in box 8  (r9c5=1)
   r4c5<>1
   r6c5<>1
   r9c5<>6
   r9c5<>8
   r9c5<>9
   r9c9<>1
Hidden single 8 in row 9  (r9c6=8)
   r3c6<>8
   r5c6<>8
   r6c6<>8
   r9c6<>6
   r9c6<>9
Hidden single 8 in row 3  (r3c4=8)
   r3c4<>2
   r3c4<>4
   r3c4<>7
   r3c4<>9
   r4c4<>8
   r5c4<>8
   r6c4<>8
Hidden single 9 in row 9  (r9c3=9)
   r2c3<>9
   r3c3<>9
   r4c3<>9
   r6c3<>9
   r7c1<>9
   r7c3<>9
   r8c1<>9
   r9c3<>6
Hidden single 6 in row 9  (r9c9=6)
   r3c9<>6
   r8c7<>6
   r8c8<>6
   r8c9<>6
Hidden single 6 in row 8  (r8c1=6)
   r1c1<>6
   r3c1<>6
   r7c1<>6
   r7c3<>6
   r8c1<>3
Hidden single 6 in row 1  (r1c7=6)
   r1c7<>2
   r1c7<>3
   r1c7<>4
   r1c7<>9
   r3c7<>6
   r3c8<>6
   r5c7<>6
   r6c7<>6
Hidden single 6 in row 3  (r3c3=6)
   r3c3<>2
   r3c3<>4
   r3c3<>7
Hidden single 7 in row 3  (r3c6=7)
   r3c6<>2
   r3c6<>9
   r5c6<>7
Hidden single 7 in row 5  (r5c4=7)
   r5c4<>2
   r5c4<>4
Hidden single 6 in row 7  (r7c6=6)
   r5c6<>6
   r6c6<>6
   r7c6<>9
Hidden single 6 in row 6  (r6c5=6)
   r5c5<>6
   r6c5<>5
   r6c5<>8
   r6c5<>9
Hidden single 6 in row 5  (r5c8=6)
   r5c8<>3
   r5c8<>5
Hidden single 9 in row 7  (r7c4=9)
   r1c4<>9
   r4c4<>9
   r6c4<>9
Hidden single 9 in row 4  (r4c5=9)
   r1c5<>9
   r2c5<>9
   r4c5<>4
   r4c5<>5
   r4c5<>8
   r6c6<>9
Hidden single 8 in col 5  (r5c5=8)
   r5c2<>8
   r5c3<>8
   r5c5<>4
   r5c5<>5
   r5c7<>8
Hidden single 9 in col 6  (r1c6=9)
   r1c1<>9
   r1c2<>9
   r1c6<>2
   r1c6<>5
Hidden single 5 in row 1  (r1c5=5)
   r1c5<>4
   r2c5<>5
Hidden single 4 in col 5  (r2c5=4)
   r1c4<>4
   r2c2<>4
   r2c3<>4
   r2c7<>4
Hidden single 4 in col 4  (r4c4=4)
   r4c3<>4
   r4c4<>1
   r4c4<>2
Hidden single 1 in col 4  (r6c4=1)
   r6c4<>2
   r6c7<>1
Hidden single 2 in col 4  (r1c4=2)
   r1c1<>2
Hidden single 4 in col 7  (r3c7=4)
   r3c1<>4
   r3c7<>1
   r3c7<>2
   r3c7<>9
Naked double col 1 - 34
   r6c1<>3
Naked double col 2 - 34
   r2c2<>3
   r6c2<>3
Naked double box 1 - 34
   r2c3<>3
Locked candidate (3) in box 6
   r2c7<>3
   r8c7<>3
Naked Triplets 129 in box 3
   r2c8<>9
   r2c9<>2
Locked candidate (5) in box 6
   r4c3<>5
Naked Triplets 278 in column 3
   r5c3<>2
   r6c3<>2
   r6c3<>8
XY Wing 39 - 87 num = 1
   r8c9<>1
Naked single 3 row 8 column 9  (r8c9=3)
   r2c9<>3
   r8c8<>3
Hidden single 3 in row 2  (r2c8=3)
   r2c8<>5
Hidden single 5 in row 2  (r2c9=5)
   r4c9<>5
Hidden single 5 in row 4  (r4c8=5)
   r4c8<>1
ER_Row1 = 2 Row2 = 6 col1 = 3 col2 = 7 digit = 2 target = 67 hinge = 63
   r6c7<>2
ER_Row1 = 2 Row2 = 4 col1 = 7 col2 = 3 digit = 2 target = 43 hinge = 47
   r4c3<>2
Hidden single 2 in col 3  (r2c3=2)
   r2c3<>7
   r2c7<>2
   r3c1<>2
Hidden single 7 in row 2  (r2c2=7)
   r2c2<>9
   r8c2<>7
Hidden single 9 in row 2  (r2c7=9)
   r3c8<>9
   r8c7<>9
Hidden single 2 in row 3  (r3c9=2)
   r3c9<>1
   r4c9<>2
Hidden single 1 in row 3  (r3c8=1)
   r8c8<>1
Hidden single 9 in row 3  (r3c1=9)
   r6c1<>9
Hidden single 2 in row 4  (r4c7=2)
   r4c7<>1
   r4c7<>8
   r5c7<>2
Hidden single 1 in row 4  (r4c9=1)
Hidden single 8 in row 4  (r4c3=8)
   r6c2<>8
   r8c3<>8
Hidden single 2 in row 5  (r5c6=2)
   r5c6<>5
   r6c6<>2
Hidden single 5 in row 5  (r5c3=5)
   r5c3<>3
   r5c3<>4
   r6c3<>5
Hidden single 4 in row 5  (r5c2=4)
   r1c2<>4
   r5c2<>3
Hidden single 4 in row 1  (r1c1=4)
   r1c1<>3
   r7c1<>4
Hidden single 3 in row 1  (r1c2=3)
Hidden single 3 in row 5  (r5c7=3)
   r6c7<>3
Hidden single 2 in row 6  (r6c1=2)
Hidden single 3 in row 6  (r6c3=3)
   r7c3<>3
Hidden single 5 in row 6  (r6c6=5)
Hidden single 8 in row 6  (r6c7=8)
Hidden single 9 in row 6  (r6c2=9)
Hidden single 3 in row 7  (r7c1=3)
Hidden single 4 in row 7  (r7c3=4)
Hidden single 1 in row 8  (r8c7=1)
Hidden single 7 in row 8  (r8c3=7)
Hidden single 8 in row 8  (r8c2=8)
Hidden single 9 in row 8  (r8c8=9)