Analysis of zz-menneske-no-06912949-base.sdk

Contents

Sudoku from http://www.menneske.no/sudoku/utskrift.html?number=06912949

level: medium

Sudoku from http://www.menneske.no/sudoku/utskrift.html?number=06912949

position: ....7.6.8.5..........1...2.5.6........28....7...93...1.1.....3......48..9.7.6.... initial

Autosolve

position: ....7.6.8.5.6........1...2.5.6....8.1.28....7...93...1.1.....3......48..9.7.6.... autosolve
Autosolve

Pair Reduction Variants

Pair Reduction Analysis

Pair Reduction Analysis

The following important HDP chains were detected:

* PRF # A1: 2,4 => SOL
* PRF # D1: 3,5 => SOL
* PRF # C7: 4,8 => SOL
* DIS # F6: 5,6 => CTR => F6: 2
* DIS # H5: 5,6 => CTR => H5: 4,9
* DIS # F6: 6 => CTR => F6: 2,5
* DIS # G7: 2,5 => CTR => G7: 4,7,9
* DIS # H5: 5,6 => CTR => H5: 4,9
* DIS # F6: 5,6 => CTR => F6: 2
* PRF # A7: 2,6 => SOL
* PRF # I8: 2,6 => SOL
* CNT  11 HDP CHAINS /  39 HYP OPENED

See Appendix: Full HDP Chains for full list of HDP chains.

Pair Reduction

Pair Reduction

The following important HDP chains were detected:

* PRF # A1: 2,4 => SOL
* STA A1: 2,4
* CNT   1 HDP CHAINS /   1 HYP OPENED

See Appendix: Full HDP Chains for full list of HDP chains.

Details

Positions

....7.6.8.5..........1...2.5.6........28....7...93...1.1.....3......48..9.7.6.... initial
....7.6.8.5.6........1...2.5.6....8.1.28....7...93...1.1.....3......48..9.7.6.... autosolve
241573698853629174769148325596417283132856947478932561614285739325794816987361452 solved

Classification

level: medium

Pairing Analysis

--------------------------------------------------
* PAIRS (10)
B1: 2,4
B4: 3,9
B5: 3,9
C6: 4,8
E5: 4,5
F5: 5,6
G6: 2,5
H6: 5,6
B8: 2,6
C8: 3,5

--------------------------------------------------
* CONSTRAINT PAIRS (AUTO SOLVE)
C1,C2: 1.. / C1 = 1  => 10 pairs (_) / C2 = 1  =>  0 pairs (X)
E4,F4: 1.. / E4 = 1  => 20 pairs (_) / F4 = 1  => 19 pairs (_)
E8,F9: 1.. / E8 = 1  => 19 pairs (_) / F9 = 1  => 20 pairs (_)
C1,H1: 1.. / C1 = 1  => 10 pairs (_) / H1 = 1  =>  0 pairs (X)
E8,H8: 1.. / E8 = 1  => 19 pairs (_) / H8 = 1  => 20 pairs (_)
E4,E8: 1.. / E4 = 1  => 20 pairs (_) / E8 = 1  => 19 pairs (_)
F4,F9: 1.. / F4 = 1  => 19 pairs (_) / F9 = 1  => 20 pairs (_)
G2,G9: 1.. / G2 = 1  => 10 pairs (_) / G9 = 1  =>  0 pairs (X)
F6,G6: 2.. / F6 = 2  => 10 pairs (_) / G6 = 2  =>  0 pairs (X)
B4,B5: 3.. / B4 = 3  =>  8 pairs (_) / B5 = 3  =>  8 pairs (_)
A8,C8: 3.. / A8 = 3  =>  0 pairs (*) / C8 = 3  =>  0 pairs (X)
D9,F9: 3.. / D9 = 3  => 10 pairs (_) / F9 = 3  =>  0 pairs (X)
B5,G5: 3.. / B5 = 3  =>  8 pairs (_) / G5 = 3  =>  8 pairs (_)
D1,D9: 3.. / D1 = 3  =>  0 pairs (X) / D9 = 3  => 10 pairs (_)
D1,D4: 4.. / D1 = 4  => 19 pairs (_) / D4 = 4  =>  0 pairs (*)
C7,C8: 5.. / C7 = 5  => 15 pairs (_) / C8 = 5  =>  0 pairs (*)
A3,B3: 6.. / A3 = 6  => 10 pairs (_) / B3 = 6  =>  0 pairs (*)
F5,F6: 6.. / F5 = 6  =>  9 pairs (_) / F6 = 6  =>  0 pairs (X)
H5,H6: 6.. / H5 = 6  =>  0 pairs (X) / H6 = 6  =>  9 pairs (_)
I7,I8: 6.. / I7 = 6  => 10 pairs (_) / I8 = 6  =>  0 pairs (*)
F5,H5: 6.. / F5 = 6  =>  9 pairs (_) / H5 = 6  =>  0 pairs (X)
F6,H6: 6.. / F6 = 6  =>  0 pairs (X) / H6 = 6  =>  9 pairs (_)
A7,I7: 6.. / A7 = 6  =>  0 pairs (*) / I7 = 6  =>  0 pairs (X)
B3,B8: 6.. / B3 = 6  =>  0 pairs (*) / B8 = 6  =>  0 pairs (X)
A6,B6: 7.. / A6 = 7  => 11 pairs (_) / B6 = 7  => 11 pairs (_)
D4,F4: 7.. / D4 = 7  => 19 pairs (_) / F4 = 7  => 20 pairs (_)
G7,H8: 7.. / G7 = 7  => 20 pairs (_) / H8 = 7  => 19 pairs (_)
D8,H8: 7.. / D8 = 7  => 20 pairs (_) / H8 = 7  => 19 pairs (_)
B3,B6: 7.. / B3 = 7  => 11 pairs (_) / B6 = 7  => 11 pairs (_)
F4,F7: 7.. / F4 = 7  => 20 pairs (_) / F7 = 7  => 19 pairs (_)
H2,H8: 7.. / H2 = 7  => 20 pairs (_) / H8 = 7  => 19 pairs (_)
B9,F9: 8.. / B9 = 8  => 12 pairs (_) / F9 = 8  => 19 pairs (_)
B4,B5: 9.. / B4 = 9  =>  8 pairs (_) / B5 = 9  =>  8 pairs (_)
* DURATION: 0:00:49.896795  START: 07:05:23.340236  END: 07:06:13.237031 2017-05-01
* CP COUNT: (33)
* SOLUTION FOUND

--------------------------------------------------
* PREPARE PR GRAPH
* PAIR REDUCTION ..
* LEVEL 0 PASS 1 ROUND 1 (AUTO SOLVE) (B1,B4,B5,B8,C6,C8,E5,F5,G6,H6)
* ....7.6.8.5.6........1...2.5.6....8.1.28....7...93...1.1.....3......48..9.7.6....
* PAIR B1: 2,4 BLK 1
A1: 2,4,3                                # reduction candidate for 2,4
A1: 2,4 => SOLVED
* 241573698853629174769148325596417283132856947478932561614285739325794816987361452
A1: 3                                    # 15 pairs
A2: 2,4,3,7,8                            # reduction candidate for 2,4
A2: 2,4                                  # 21 pairs
* PAIR B1: 2,4 ROW 1
D1: 2,4,3,5                              # reduction candidate for 2,4
D1: 3,5 => SOLVED
* 241573698853629174769148325596417283132856947478932561614285739325794816987361452
D1: 2,4                                  # 19 pairs
* PAIR B1: 2,4 COL B
B9: 2,4,8                                # reduction candidate for 2,4
B9: 2,4                                  # 19 pairs
B9: 8                                    # 12 pairs
* PAIR B4: 3,9 ROW 4
G4: 3,9,2,4                              # reduction candidate for 3,9
G4: 3,9                                  # 12 pairs
I4: 3,9,2,4                              # reduction candidate for 3,9
I4: 3,9                                  # 12 pairs
* PAIR B5: 3,9 ROW 5
G5: 3,9,4,5                              # reduction candidate for 3,9
G5: 3,9                                  # 11 pairs
G5: 4,5                                  #  8 pairs
* PAIR C6: 4,8 BLK 4
A6: 4,8,7                                # reduction candidate for 4,8
A6: 4,8                                  # 11 pairs
B6: 4,8,7                                # reduction candidate for 4,8
B6: 4,8                                  # 11 pairs
* PAIR C6: 4,8 COL C
C2: 4,8,1,3,9                            # reduction candidate for 4,8
C2: 4,8                                  # 16 pairs
C3: 4,8,3,9                              # reduction candidate for 4,8
C3: 4,8                                  # 18 pairs
C7: 4,8,5                                # reduction candidate for 4,8
C7: 4,8 => SOLVED
* 241573698853629174769148325596417283132856947478932561614285739325794816987361452
C7: 5                                    # 15 pairs
* PAIR E5: 4,5 ROW 5
G5: 4,5,3,9                              # reduction candidate for 4,5
G5: 4,5                                  #  8 pairs
H5: 4,5,6,9                              # reduction candidate for 4,5
H5: 4,5                                  # 11 pairs
* PAIR E5: 4,5 COL E
E3: 4,5,8,9                              # reduction candidate for 4,5
E3: 4,5                                  # 12 pairs
E3: 8,9                                  # 11 pairs
* PAIR F5: 5,6 BLK 5
F6: 5,6,2                                # reduction candidate for 5,6
F6: 5,6 => CTR
* 321479658.5.62....6..15..2.59621..8.132846597...935261.1.....3..6...48..9.7362..5
F6: 2                                    # 10 pairs
* PAIR F5: 5,6 ROW 5
H5: 5,6,4,9                              # reduction candidate for 5,6
H5: 5,6 => CTR
* ....7.6.8.5.6........1...2.5.6....8.1.28....7...93...1.1.....3......48..9.7.6....
H5: 4,9                                  # 10 pairs
* PAIR G6: 2,5 ROW 6
F6: 2,5,6                                # reduction candidate for 2,5
F6: 6 => CTR
* ...57.6.8.5.6........1...2.5.64...8.1.28.5.67...936251.1.....3......48..9.7.6....
F6: 2,5                                  #  9 pairs
* PAIR G6: 2,5 COL G
G7: 2,5,4,7,9                            # reduction candidate for 2,5
G7: 2,5 => CTR
* .2.47.6.8.5.6........1...2.5.67.1.8.1.28....7...93...1.1..97.36.6..14879947368...
G7: 4,7,9                                # 10 pairs
G9: 2,5,1,4                              # reduction candidate for 2,5
G9: 2,5                                  # 11 pairs
* PAIR H6: 5,6 BLK 6
H5: 5,6,4,9                              # reduction candidate for 5,6
H5: 5,6 => CTR
* ....7.6.8.5.6........1...2.5.6....8.1.28....7...93...1.1.....3......48..9.7.6....
H5: 4,9                                  # 10 pairs
* PAIR H6: 5,6 ROW 6
F6: 5,6,2                                # reduction candidate for 5,6
F6: 5,6 => CTR
* 321479658.5.62....6..15..2.59621..8.132846597...935261.1.....3..6...48..9.7362..5
F6: 2                                    # 10 pairs
* PAIR B8: 2,6 BLK 7
A7: 2,6,4,8                              # reduction candidate for 2,6
A7: 2,6 => SOLVED
* 241573698853629174769148325596417283132856947478932561614285739325794816987361452
A7: 4,8                                  # 11 pairs
A8: 2,6,3                                # reduction candidate for 2,6
A8: 2,6                                  # 15 pairs
* PAIR B8: 2,6 ROW 8
I8: 2,6,5,9                              # reduction candidate for 2,6
I8: 2,6 => SOLVED
* 241573698853629174769148325596417283132856947478932561614285739325794816987361452
I8: 5,9                                  # 11 pairs
* INCONCLUSIVE
* SAVE PR GRAPH zz-menneske-no-06912949-base-pr-000.dot
* REASONING
* PRF # A1: 2,4 => SOL
* PRF # D1: 3,5 => SOL
* PRF # C7: 4,8 => SOL
* DIS # F6: 5,6 => CTR => F6: 2
* DIS # H5: 5,6 => CTR => H5: 4,9
* DIS # F6: 6 => CTR => F6: 2,5
* DIS # G7: 2,5 => CTR => G7: 4,7,9
* DIS # H5: 5,6 => CTR => H5: 4,9
* DIS # F6: 5,6 => CTR => F6: 2
* PRF # A7: 2,6 => SOL
* PRF # I8: 2,6 => SOL
* CNT  11 HDP CHAINS /  39 HYP OPENED

--------------------------------------------------
* PREPARE PR GRAPH
* PAIR REDUCTION ..
* LEVEL 0 PASS 1 ROUND 1 (AUTO SOLVE) (B1,B4,B5,B8,C6,C8,E5,F5,G6,H6)
* ....7.6.8.5.6........1...2.5.6....8.1.28....7...93...1.1.....3......48..9.7.6....
* PAIR B1: 2,4 BLK 1
A1: 2,4,3                                # reduction candidate for 2,4
A1: 2,4 => SOLVED
* 241573698853629174769148325596417283132856947478932561614285739325794816987361452
* DURATION: 0:00:02.593505  START: 07:06:44.344071  END: 07:06:46.937576 2017-05-01
* SOLUTION FOUND
* SAVE PR GRAPH zz-menneske-no-06912949-base-pr-001.dot
* REASONING
* PRF # A1: 2,4 => SOL
* STA A1: 2,4
* CNT   1 HDP CHAINS /   1 HYP OPENED

Header Info

http://www.menneske.no/sudoku/utskrift.html?number=06912949
umulig

-----------------------------
Positions
-----------------------------

===================================================================================== =========
``....7.6.8.5..........1...2.5.6........28....7...93...1.1.....3......48..9.7.6....`` initial
``....7.6.8.5.6........1...2.5.6....8.1.28....7...93...1.1.....3......48..9.7.6....`` autosolve
``241573698853629174769148325596417283132856947478932561614285739325794816987361452`` solved
===================================================================================== =========

----------------------------------
Classification
----------------------------------

level: medium

------------------------------------
Pairing Analysis
------------------------------------

--------------------------------------------------
* PREPARE PR GRAPH
* PAIR REDUCTION ..
* LEVEL 0 PASS 1 ROUND 1 (AUTO SOLVE) (B1,B4,B5,B8,C6,C8,E5,F5,G6,H6)
* ....7.6.8.5.6........1...2.5.6....8.1.28....7...93...1.1.....3......48..9.7.6....
* PAIR B1: 2,4 BLK 1
A1: 2,4,3                                # reduction candidate for 2,4
A1: 2,4 => SOLVED
* 241573698853629174769148325596417283132856947478932561614285739325794816987361452
A1: 3                                    # 15 pairs
A2: 2,4,3,7,8                            # reduction candidate for 2,4
A2: 2,4                                  # 21 pairs
* PAIR B1: 2,4 ROW 1
D1: 2,4,3,5                              # reduction candidate for 2,4
D1: 3,5 => SOLVED
* 241573698853629174769148325596417283132856947478932561614285739325794816987361452
D1: 2,4                                  # 19 pairs
* PAIR B1: 2,4 COL B
B9: 2,4,8                                # reduction candidate for 2,4
B9: 2,4                                  # 19 pairs
B9: 8                                    # 12 pairs
* PAIR B4: 3,9 ROW 4
G4: 3,9,2,4                              # reduction candidate for 3,9
G4: 3,9                                  # 12 pairs
I4: 3,9,2,4                              # reduction candidate for 3,9
I4: 3,9                                  # 12 pairs
* PAIR B5: 3,9 ROW 5
G5: 3,9,4,5                              # reduction candidate for 3,9
G5: 3,9                                  # 11 pairs
G5: 4,5                                  #  8 pairs
* PAIR C6: 4,8 BLK 4
A6: 4,8,7                                # reduction candidate for 4,8
A6: 4,8                                  # 11 pairs
B6: 4,8,7                                # reduction candidate for 4,8
B6: 4,8                                  # 11 pairs
* PAIR C6: 4,8 COL C
C2: 4,8,1,3,9                            # reduction candidate for 4,8
C2: 4,8                                  # 16 pairs
C3: 4,8,3,9                              # reduction candidate for 4,8
C3: 4,8                                  # 18 pairs
C7: 4,8,5                                # reduction candidate for 4,8
C7: 4,8 => SOLVED
* 241573698853629174769148325596417283132856947478932561614285739325794816987361452
C7: 5                                    # 15 pairs
* PAIR E5: 4,5 ROW 5
G5: 4,5,3,9                              # reduction candidate for 4,5
G5: 4,5                                  #  8 pairs
H5: 4,5,6,9                              # reduction candidate for 4,5
H5: 4,5                                  # 11 pairs
* PAIR E5: 4,5 COL E
E3: 4,5,8,9                              # reduction candidate for 4,5
E3: 4,5                                  # 12 pairs
E3: 8,9                                  # 11 pairs
* PAIR F5: 5,6 BLK 5
F6: 5,6,2                                # reduction candidate for 5,6
F6: 5,6 => CTR
* 321479658.5.62....6..15..2.59621..8.132846597...935261.1.....3..6...48..9.7362..5
F6: 2                                    # 10 pairs
* PAIR F5: 5,6 ROW 5
H5: 5,6,4,9                              # reduction candidate for 5,6
H5: 5,6 => CTR
* ....7.6.8.5.6........1...2.5.6....8.1.28....7...93...1.1.....3......48..9.7.6....
H5: 4,9                                  # 10 pairs
* PAIR G6: 2,5 ROW 6
F6: 2,5,6                                # reduction candidate for 2,5
F6: 6 => CTR
* ...57.6.8.5.6........1...2.5.64...8.1.28.5.67...936251.1.....3......48..9.7.6....
F6: 2,5                                  #  9 pairs
* PAIR G6: 2,5 COL G
G7: 2,5,4,7,9                            # reduction candidate for 2,5
G7: 2,5 => CTR
* .2.47.6.8.5.6........1...2.5.67.1.8.1.28....7...93...1.1..97.36.6..14879947368...
G7: 4,7,9                                # 10 pairs
G9: 2,5,1,4                              # reduction candidate for 2,5
G9: 2,5                                  # 11 pairs
* PAIR H6: 5,6 BLK 6
H5: 5,6,4,9                              # reduction candidate for 5,6
H5: 5,6 => CTR
* ....7.6.8.5.6........1...2.5.6....8.1.28....7...93...1.1.....3......48..9.7.6....
H5: 4,9                                  # 10 pairs
* PAIR H6: 5,6 ROW 6
F6: 5,6,2                                # reduction candidate for 5,6
F6: 5,6 => CTR
* 321479658.5.62....6..15..2.59621..8.132846597...935261.1.....3..6...48..9.7362..5
F6: 2                                    # 10 pairs
* PAIR B8: 2,6 BLK 7
A7: 2,6,4,8                              # reduction candidate for 2,6
A7: 2,6 => SOLVED
* 241573698853629174769148325596417283132856947478932561614285739325794816987361452
A7: 4,8                                  # 11 pairs
A8: 2,6,3                                # reduction candidate for 2,6
A8: 2,6                                  # 15 pairs
* PAIR B8: 2,6 ROW 8
I8: 2,6,5,9                              # reduction candidate for 2,6
I8: 2,6 => SOLVED
* 241573698853629174769148325596417283132856947478932561614285739325794816987361452
I8: 5,9                                  # 11 pairs
* UNSOLVED!
* SAVE PR GRAPH zz-menneske-no-06912949-base-pr-000.dot

--------------------------------------------------
* PREPARE PR GRAPH
* PAIR REDUCTION ..
* LEVEL 0 PASS 1 ROUND 1 (AUTO SOLVE) (B1,B4,B5,B8,C6,C8,E5,F5,G6,H6)
* ....7.6.8.5.6........1...2.5.6....8.1.28....7...93...1.1.....3......48..9.7.6....
* PAIR B1: 2,4 BLK 1
A1: 2,4,3                                # reduction candidate for 2,4
A1: 2,4 => SOLVED
* 241573698853629174769148325596417283132856947478932561614285739325794816987361452
* SOLVED!
* SAVE PR GRAPH zz-menneske-no-06912949-base-pr-001.dot

Solution

position: 241573698853629174769148325596417283132856947478932561614285739325794816987361452 solved
Solution

See section Pair Reduction for the HDP chains leading to this result.

Appendix: Full HDP Chains

A1. Pair Reduction Analysis

Full list of HDP chains traversed:

* PRF # A1: 2,4 => SOL
* INC # A1: 3 => UNS
* INC # A2: 2,4 => UNS
* INC # D1: 2,4 => UNS
* PRF # D1: 3,5 => SOL
* INC # B9: 2,4 => UNS
* INC # B9: 8 => UNS
* INC # G4: 3,9 => UNS
* INC # I4: 3,9 => UNS
* INC # G5: 3,9 => UNS
* INC # G5: 4,5 => UNS
* INC # A6: 4,8 => UNS
* INC # B6: 4,8 => UNS
* INC # C2: 4,8 => UNS
* INC # C3: 4,8 => UNS
* PRF # C7: 4,8 => SOL
* INC # C7: 5 => UNS
* INC # G5: 4,5 => UNS
* INC # H5: 4,5 => UNS
* INC # E3: 4,5 => UNS
* INC # E3: 8,9 => UNS
* DIS # F6: 5,6 => CTR => F6: 2
* INC # F6: 2 => UNS
* DIS # H5: 5,6 => CTR => H5: 4,9
* INC # H5: 4,9 => UNS
* INC # F6: 2,5 => UNS
* DIS # F6: 6 => CTR => F6: 2,5
* DIS # G7: 2,5 => CTR => G7: 4,7,9
* INC # G7: 4,7,9 => UNS
* INC # G9: 2,5 => UNS
* DIS # H5: 5,6 => CTR => H5: 4,9
* INC # H5: 4,9 => UNS
* DIS # F6: 5,6 => CTR => F6: 2
* INC # F6: 2 => UNS
* PRF # A7: 2,6 => SOL
* INC # A7: 4,8 => UNS
* INC # A8: 2,6 => UNS
* PRF # I8: 2,6 => SOL
* INC # I8: 5,9 => UNS
* CNT  39 HDP CHAINS /  39 HYP OPENED

A2. Pair Reduction

Full list of HDP chains traversed:

* PRF # A1: 2,4 => SOL
* STA A1: 2,4
* CNT   1 HDP CHAINS /   1 HYP OPENED