Analysis of zz-werner-guess-000-base.sdk

Contents

Original Sudoku

level: medium

Original Sudoku

position: 521...7.3.6.....5...8...4.1...7...4.....21....72.85...1.3.69..5...13...9..6.7.... initial

Autosolve

position: 521.4.7.3.6..1..5...8.5.4.1.1579..4.....215.7.72.85..6143.69.75.571346.9..657...4 autosolve
Autosolve

Pair Reduction Variants

Pair Reduction Analysis

Pair Reduction Analysis

The following important HDP chains were detected:

* DIS # A2: 4,9 => CTR => A2: 3,7
* DIS # D3: 3,9 => CTR => D3: 2,6
* DIS # B5: 3,9 => CTR => B5: 8
* DIS # D1: 6,8 => CTR => D1: 9
* DIS # H1: 9 => CTR => H1: 6,8
* DIS # G2: 2,8 => CTR => G2: 9
* PRF # D2: 2,8 => SOL
* DIS # F2: 2,8 => CTR => F2: 3,7
* DIS # A5: 4,9 => CTR => A5: 3,6,8
* PRF # D5: 4 => SOL
* DIS # A4: 8 => CTR => A4: 3,6
* DIS # F3: 3,6 => CTR => F3: 2,7
* PRF # D5: 3,4 => SOL
* DIS # D5: 6 => CTR => D5: 3,4
* DIS # A6: 9 => CTR => A6: 3,4
* DIS # G4: 3 => CTR => G4: 2,8
* DIS # A9: 9 => CTR => A9: 2,8
* PRF # A9: 8,9 => SOL
* DIS # A9: 2 => CTR => A9: 8,9
* DIS # B5: 3 => CTR => B5: 8,9
* PRF # D2: 2,8 => SOL
* DIS # A9: 9 => CTR => A9: 2,8
* DIS # F2: 2,8 => CTR => F2: 3,7
* DIS # G2: 2,8 => CTR => G2: 9
* DIS # G6: 9 => CTR => G6: 1,3
* CNT  25 HDP CHAINS /  52 HYP OPENED

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

Pair Reduction

Pair Reduction

The following important HDP chains were detected:

* DIS # A2: 4,9 => CTR => A2: 3,7
* DIS A2: 3,7 # A3: 7 => CTR => A3: 3,9
* DIS A2: 3,7 + A3: 3,9 # D1: 6,8 => CTR => D1: 9
* PRF A2: 3,7 + A3: 3,9 + D1: 9 # D2: 2,8 => SOL
* STA A2: 3,7 + A3: 3,9 + D1: 9 + D2: 2,8
* CNT   4 HDP CHAINS /   5 HYP OPENED

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

Details

Positions

521...7.3.6.....5...8...4.1...7...4.....21....72.85...1.3.69..5...13...9..6.7.... initial
521.4.7.3.6..1..5...8.5.4.1.1579..4.....215.7.72.85..6143.69.75.571346.9..657...4 autosolve
521948763764213958938657421315796842689421537472385196143869275257134689896572314 solved

Classification

level: medium

Pairing Analysis

--------------------------------------------------
* PAIRS (16)
C2: 4,9
B3: 3,9
F1: 6,8
I2: 2,8
C5: 4,9
F4: 3,6
D6: 3,4
I4: 2,8
A8: 2,8
B9: 8,9
D7: 2,8
F9: 2,8
G7: 2,8
H8: 2,8
G9: 1,3
H9: 1,3

--------------------------------------------------
* CONSTRAINT PAIRS (AUTO SOLVE)
G6,H6: 1.. / G6 = 1  => 19 pairs (_) / H6 = 1  => 16 pairs (_)
G9,H9: 1.. / G9 = 1  => 16 pairs (_) / H9 = 1  => 19 pairs (_)
G6,G9: 1.. / G6 = 1  => 19 pairs (_) / G9 = 1  => 16 pairs (_)
H6,H9: 1.. / H6 = 1  => 16 pairs (_) / H9 = 1  => 19 pairs (_)
G4,I4: 2.. / G4 = 2  =>  0 pairs (X) / I4 = 2  => 17 pairs (_)
A8,A9: 2.. / A8 = 2  =>  0 pairs (*) / A9 = 2  =>  0 pairs (X)
D7,F9: 2.. / D7 = 2  =>  0 pairs (X) / F9 = 2  =>  0 pairs (_)
G7,H8: 2.. / G7 = 2  =>  0 pairs (*) / H8 = 2  =>  0 pairs (X)
D7,G7: 2.. / D7 = 2  =>  0 pairs (X) / G7 = 2  =>  0 pairs (_)
A8,H8: 2.. / A8 = 2  =>  0 pairs (*) / H8 = 2  =>  0 pairs (X)
A9,F9: 2.. / A9 = 2  =>  0 pairs (X) / F9 = 2  =>  0 pairs (_)
H3,H8: 2.. / H3 = 2  =>  0 pairs (*) / H8 = 2  =>  0 pairs (X)
I2,I4: 2.. / I2 = 2  =>  0 pairs (X) / I4 = 2  => 17 pairs (_)
G9,H9: 3.. / G9 = 3  => 19 pairs (_) / H9 = 3  => 16 pairs (_)
B3,B5: 3.. / B3 = 3  => 17 pairs (_) / B5 = 3  =>  0 pairs (X)
A2,C2: 4.. / A2 = 4  =>  0 pairs (X) / C2 = 4  => 21 pairs (_)
D5,D6: 4.. / D5 = 4  =>  0 pairs (*) / D6 = 4  =>  0 pairs (X)
A6,D6: 4.. / A6 = 4  =>  0 pairs (*) / D6 = 4  =>  0 pairs (X)
C2,C5: 4.. / C2 = 4  => 21 pairs (_) / C5 = 4  =>  0 pairs (X)
H1,H3: 6.. / H1 = 6  =>  0 pairs (*) / H3 = 6  =>  0 pairs (X)
A4,A5: 6.. / A4 = 6  =>  0 pairs (X) / A5 = 6  =>  0 pairs (_)
F4,D5: 6.. / F4 = 6  =>  0 pairs (*) / D5 = 6  =>  0 pairs (X)
A4,F4: 6.. / A4 = 6  =>  0 pairs (X) / F4 = 6  =>  0 pairs (_)
A5,D5: 6.. / A5 = 6  =>  0 pairs (*) / D5 = 6  =>  0 pairs (X)
A2,A3: 7.. / A2 = 7  => 24 pairs (_) / A3 = 7  => 16 pairs (_)
F2,F3: 7.. / F2 = 7  => 16 pairs (_) / F3 = 7  => 24 pairs (_)
A2,F2: 7.. / A2 = 7  => 24 pairs (_) / F2 = 7  => 16 pairs (_)
A3,F3: 7.. / A3 = 7  => 16 pairs (_) / F3 = 7  => 24 pairs (_)
D7,F9: 8.. / D7 = 8  =>  0 pairs (*) / F9 = 8  =>  0 pairs (X)
G7,H8: 8.. / G7 = 8  =>  0 pairs (X) / H8 = 8  =>  0 pairs (_)
D7,G7: 8.. / D7 = 8  =>  0 pairs (*) / G7 = 8  =>  0 pairs (X)
A8,H8: 8.. / A8 = 8  =>  0 pairs (X) / H8 = 8  =>  0 pairs (_)
B5,B9: 8.. / B5 = 8  => 19 pairs (_) / B9 = 8  =>  0 pairs (X)
I2,I4: 8.. / I2 = 8  => 17 pairs (_) / I4 = 8  =>  0 pairs (X)
A9,B9: 9.. / A9 = 9  =>  0 pairs (X) / B9 = 9  => 19 pairs (_)
D1,H1: 9.. / D1 = 9  => 17 pairs (_) / H1 = 9  =>  0 pairs (X)
C2,C5: 9.. / C2 = 9  =>  0 pairs (X) / C5 = 9  => 21 pairs (_)
G2,G6: 9.. / G2 = 9  => 19 pairs (_) / G6 = 9  =>  0 pairs (X)
* DURATION: 0:01:01.757229  START: 03:15:46.951951  END: 03:16:48.709180 2017-05-01
* CP COUNT: (38)
* SOLUTION FOUND

--------------------------------------------------
* PREPARE PR GRAPH
* PAIR REDUCTION ..
* LEVEL 0 PASS 1 ROUND 1 (AUTO SOLVE) (A8,B3,B9,C2,C5,D6,D7,F1,F4,F9,G7,G9,H8,H9,I2,I4)
* 521.4.7.3.6..1..5...8.5.4.1.1579..4.....215.7.72.85..6143.69.75.571346.9..657...4
* PAIR C2: 4,9 BLK 1
A2: 4,9,3,7                              # reduction candidate for 4,9
A2: 4,9 => CTR
* 521.4.7.3.6.317.5.738.5.4.1615793.4....6215.7.72485..6143.69.75.571346.9..657...4
A2: 3,7                                  # 23 pairs
* PAIR B3: 3,9 BLK 1
A2: 3,9,4,7                              # reduction candidate for 3,9
A2: 3,9                                  # 22 pairs
A3: 3,9,7                                # reduction candidate for 3,9
A3: 3,9                                  # 24 pairs
* PAIR B3: 3,9 ROW 3
D3: 3,9,2,6                              # reduction candidate for 3,9
D3: 3,9 => CTR
* 521.4.7.3.6..1795.79835.4.1615793.4..396215.7.72485..6143.69.75.571346.9..657...4
D3: 2,6                                  # 17 pairs
* PAIR B3: 3,9 COL B
B5: 3,9,8                                # reduction candidate for 3,9
B5: 3,9 => CTR
* 52194876346921..5...8.5.421.1579..428..6215.7.72485..6143869275257134689986572..4
B5: 8                                    # 19 pairs
* PAIR F1: 6,8 BLK 2
D1: 6,8,9                                # reduction candidate for 6,8
D1: 6,8 => CTR
* 521846793.6..1..5..38.5.461615793.4.38..215.7.72.85916143.69.75.57134629296578134
D1: 9                                    # 17 pairs
* PAIR F1: 6,8 ROW 1
H1: 6,8,9                                # reduction candidate for 6,8
H1: 9 => CTR
* 521846793.6..1..5..38.5.461615793.4.38..215.7.72.85916143.69.75.57134629296578134
H1: 6,8                                  # 17 pairs
* PAIR I2: 2,8 BLK 3
G2: 2,8,9                                # reduction candidate for 2,8
G2: 2,8 => CTR
* 521.4.7.3.6..1..5...8.5.4.1.1579.342....21587.72.85916143.69875857134629296578134
G2: 9                                    # 19 pairs
* PAIR I2: 2,8 ROW 2
D2: 2,8,3,9                              # reduction candidate for 2,8
D2: 2,8 => SOLVED
* 521948763764213958938657421315796842689421537472385196143869275257134689896572314
D2: 3,9                                  # 17 pairs
F2: 2,8,3,7                              # reduction candidate for 2,8
F2: 2,8 => CTR
* 521946783764318952..825746161579324...96215.7.72485.96143.69.75.571346.9..657..14
F2: 3,7                                  # 17 pairs
* PAIR C5: 4,9 BLK 4
A5: 4,9,3,6,8                            # reduction candidate for 4,9
A5: 4,9 => CTR
* 52194.7.3.6.31.95.938257461615793.4.489621537372485196143869275.571346.9.9657.314
A5: 3,6,8                                # 16 pairs
A6: 4,9,3                                # reduction candidate for 4,9
A6: 4,9                                  # 18 pairs
* PAIR F4: 3,6 BLK 5
D5: 3,6,4                                # reduction candidate for 3,6
D5: 4 => SOLVED
* 521948763764213958938657421315796842689421537472385196143869275257134689896572314
D5: 3,6                                  # 17 pairs
* PAIR F4: 3,6 ROW 4
A4: 3,6,8                                # reduction candidate for 3,6
A4: 8 => CTR
* 521.4.7.3.6..1..5...8.5.4.18157963426...21587.72.85..6143.698752571346.9..657...4
A4: 3,6                                  # 19 pairs
* PAIR F4: 3,6 COL F
F3: 3,6,2,7                              # reduction candidate for 3,6
F3: 3,6 => CTR
* 521.48763.6.217958798.5.421.1579.842.39.215.7.72.85..6143869275257134689..6572..4
F3: 2,7                                  # 17 pairs
* PAIR D6: 3,4 BLK 5
D5: 3,4,6                                # reduction candidate for 3,4
D5: 3,4 => SOLVED
* 521948763764213958938657421315796842689421537472385196143869275257134689896572314
D5: 6 => CTR
* 52194.7.3.6431.95..3825.461615793.4.489621537372485196143869275.571346.9..657.314
* PAIR D6: 3,4 ROW 6
A6: 3,4,9                                # reduction candidate for 3,4
A6: 9 => CTR
* 521.4.7.3.69.1..5..38.5.4.1.1579..4..84.21597972485..6143.69.75.571346.9.9657...4
A6: 3,4                                  # 20 pairs
* PAIR I4: 2,8 BLK 6
G4: 2,8,3                                # reduction candidate for 2,8
G4: 3 => CTR
* 521.4.7.3.6..1..5...8.5.4.1.1579.342....21587.72.85..6143.69875857134629296578134
G4: 2,8                                  # 19 pairs
* PAIR A8: 2,8 BLK 7
A9: 2,8,9                                # reduction candidate for 2,8
A9: 9 => CTR
* 52194876346921..5...8.5.421.1579..428..6215.7.72485..6143869275257134689986572..4
A9: 2,8                                  # 19 pairs
* PAIR B9: 8,9 BLK 7
A9: 8,9,2                                # reduction candidate for 8,9
A9: 8,9 => SOLVED
* 521948763764213958938657421315796842689421537472385196143869275257134689896572314
A9: 2 => CTR
* 521.46783.6..1..5..38.5.461615793.4..8.6215.7.72485..6143269875857134629296578..4
* PAIR B9: 8,9 COL B
B5: 8,9,3                                # reduction candidate for 8,9
B5: 3 => CTR
* 521.4.7.3.6..1..5..98.5.4.1.1579..4..39.21587472385..6143869.75.571346.9.86572..4
B5: 8,9                                  # 17 pairs
* PAIR D7: 2,8 COL D
D2: 2,8,3,9                              # reduction candidate for 2,8
D2: 2,8 => SOLVED
* 521948763764213958938657421315796842689421537472385196143869275257134689896572314
D2: 3,9                                  # 17 pairs
* PAIR F9: 2,8 ROW 9
A9: 2,8,9                                # reduction candidate for 2,8
A9: 9 => CTR
* 52194876346921..5...8.5.421.1579..428..6215.7.72485..6143869275257134689986572..4
A9: 2,8                                  # 19 pairs
* PAIR F9: 2,8 COL F
F2: 2,8,3,7                              # reduction candidate for 2,8
F2: 2,8 => CTR
* 521946783764318952..825746161579324...96215.7.72485.96143.69.75.571346.9..657..14
F2: 3,7                                  # 17 pairs
* PAIR G7: 2,8 COL G
G2: 2,8,9                                # reduction candidate for 2,8
G2: 2,8 => CTR
* 521.4.7.3.6..1..5...8.5.4.1.1579.342....21587.72.85916143.69875857134629296578134
G2: 9                                    # 19 pairs
G4: 2,8,3                                # reduction candidate for 2,8
G4: 2,8                                  # 19 pairs
* PAIR G9: 1,3 COL G
G6: 1,3,9                                # reduction candidate for 1,3
G6: 9 => CTR
* 521.4.7.3.6..1..5...8.5.4.1.1579.342....21587.72.85916143.69875857134629296578134
G6: 1,3                                  # 19 pairs
* PAIR H9: 1,3 COL H
H6: 1,3,9                                # reduction candidate for 1,3
H6: 9                                    # 19 pairs
H6: 1,3                                  # 18 pairs
* INCONCLUSIVE
* SAVE PR GRAPH zz-werner-guess-000-base-pr-000.dot
* REASONING
* DIS # A2: 4,9 => CTR => A2: 3,7
* DIS # D3: 3,9 => CTR => D3: 2,6
* DIS # B5: 3,9 => CTR => B5: 8
* DIS # D1: 6,8 => CTR => D1: 9
* DIS # H1: 9 => CTR => H1: 6,8
* DIS # G2: 2,8 => CTR => G2: 9
* PRF # D2: 2,8 => SOL
* DIS # F2: 2,8 => CTR => F2: 3,7
* DIS # A5: 4,9 => CTR => A5: 3,6,8
* PRF # D5: 4 => SOL
* DIS # A4: 8 => CTR => A4: 3,6
* DIS # F3: 3,6 => CTR => F3: 2,7
* PRF # D5: 3,4 => SOL
* DIS # D5: 6 => CTR => D5: 3,4
* DIS # A6: 9 => CTR => A6: 3,4
* DIS # G4: 3 => CTR => G4: 2,8
* DIS # A9: 9 => CTR => A9: 2,8
* PRF # A9: 8,9 => SOL
* DIS # A9: 2 => CTR => A9: 8,9
* DIS # B5: 3 => CTR => B5: 8,9
* PRF # D2: 2,8 => SOL
* DIS # A9: 9 => CTR => A9: 2,8
* DIS # F2: 2,8 => CTR => F2: 3,7
* DIS # G2: 2,8 => CTR => G2: 9
* DIS # G6: 9 => CTR => G6: 1,3
* CNT  25 HDP CHAINS /  52 HYP OPENED

--------------------------------------------------
* PREPARE PR GRAPH
* PAIR REDUCTION ..
* LEVEL 0 PASS 1 ROUND 1 (AUTO SOLVE) (A8,B3,B9,C2,C5,D6,D7,F1,F4,F9,G7,G9,H8,H9,I2,I4)
* 521.4.7.3.6..1..5...8.5.4.1.1579..4.....215.7.72.85..6143.69.75.571346.9..657...4
* PAIR C2: 4,9 BLK 1
A2: 4,9,3,7                              # reduction candidate for 4,9
A2: 4,9 => CTR
* 521.4.7.3.6.317.5.738.5.4.1615793.4....6215.7.72485..6143.69.75.571346.9..657...4
* PAIR B3: 3,9 BLK 1
A3: 3,9,7                                # reduction candidate for 3,9
A3: 7 => CTR
* 521.4.7.3.64.1..5.798.5.4.1.1579..4..39.21587472385..6143.698758571346.9..657...4
* PAIR F1: 6,8 BLK 2
D1: 6,8,9                                # reduction candidate for 6,8
D1: 6,8 => CTR
* 521.4.793764913.5...8257461.15796.4.6.94215.7472385916143869275.571346.9..657...4
* PAIR I2: 2,8 ROW 2
D2: 2,8,3                                # reduction candidate for 2,8
D2: 2,8 => SOLVED
* 521948763764213958938657421315796842689421537472385196143869275257134689896572314
* DURATION: 0:00:08.832121  START: 03:17:38.716235  END: 03:17:47.548356 2017-05-01
* SOLUTION FOUND
* SAVE PR GRAPH zz-werner-guess-000-base-pr-001.dot
* REASONING
* DIS # A2: 4,9 => CTR => A2: 3,7
* DIS A2: 3,7 # A3: 7 => CTR => A3: 3,9
* DIS A2: 3,7 + A3: 3,9 # D1: 6,8 => CTR => D1: 9
* PRF A2: 3,7 + A3: 3,9 + D1: 9 # D2: 2,8 => SOL
* STA A2: 3,7 + A3: 3,9 + D1: 9 + D2: 2,8
* CNT   4 HDP CHAINS /   5 HYP OPENED

Header Info

--------------------------------------------------
level: medium

* PAIR REDUCTION ..
* ROUND 1: 521.4.7.3.6..1..5...8.5.4.1.1579..4.....215.7.72.85..6143.69.75.571346.9..657...4
C2: 4,9
A2: 3,4,7,9                              # reduction candidate for 4,9
A2: 4,9 => CTR
* 521.4.7.3.6.317.5.738.5.4.1615793.4....6215.7.72485..6143.69.75.571346.9..657...4
B3: 3,9
A3: 3,7,9                                # reduction candidate for 3,9
A3: 7 => CTR
* 521.4.7.3.64.1..5.798.5.4.1.1579..4..39.21587472385..6143.698758571346.9..657...4
F1: 6,8
D1: 6,8,9                                # reduction candidate for 6,8
D1: 6,8 => CTR
* 521.4.793764913.5...8257461.15796.4.6.94215.7472385916143869275.571346.9..657...4
I2: 2,8
D2: 2,3,8                                # reduction candidate for 2,8
D2: 2,8 => SOLVED
* 521948763764213958938657421315796842689421537472385196143869275257134689896572314
* SOLVED!
--------------------------------------------------

A single check of (all) 2-value alternatives detects the solution.
Therefore, there is no need to guess.

step-00
--------------------------------------------------

G7,H8: 2,8 => G9,H9 != 2,8

step-01
--------------------------------------------------

Highlight 1,3 to detect Pair-Square:
G6,H6,G9,H9: 1,3..

Disable G6,H6: 9.. to show that at least one is needed:
G6,H6 != 9 => H5 = 9 + G2 = 9

H5  = 9 => C5 = 4 => C2 = 9 => G2 != 9 => CTR =>
H5 != 9 => G6 = 9 or H6 = 9

auto ..

Q6: 9.. = G6,H6: 9.. => A6 != 9

step-02
--------------------------------------------------

A6,D6: 4,3 => G6,H6 != 3

step-03
--------------------------------------------------

Interesting Pair-Square (highlight 2,8)

shortcut conclusion:
G2,I4,G4,I2: 2,8.. => G2 = 9 or G4 = 3
G4 = 3 has the same effect as G4 = 8, therefore G2 = 9!

G4 = 3 =>  H5 = 8 => H8 = 2 => A8 = 8
G4 = 3 =>  F4 = 6 => A4 = 8 => A8 != 8 => CTR

auto ..

step-04
--------------------------------------------------

highlight 8
F1: 6,8
H1: 6,8
H8: 2,8
A8: 2,8
A9: 2,8
F9: 2,8
=> F2 != 8 # swordfish

D2: 2,3,8
I2: 2,8
F2: 2,3

D2 = 2 => I2 = 8 + F2 = 3
D2 = 8 => I2 = 2 + F2 = 3

F2 = 3 => F4 = 6 => D3 = 6 => F1 = 8 => D2 != 8
D2 = 8 => D2 = 2 => D2 != 8

turn off single/row column detection, auto ..
reveals either single: D7 = 8

alternatively, a single row/column is found:
Q2: 8.. = F1,F2: 8.. => F9 != 8

step-05
--------------------------------------------------

The long way ...
from step-05
--------------------------------------------------
F2: 2,3,8
I2: 2,8
D2: 2,3

F2 = 2 => I2 = 8 + (F1 = 6 => D3 = 2) => D2 = 3
F2 = 8 => I2 = 2 + D2 = 3

D2 = 3 => F4 = 3 + D6 = 4 => D5 = 6 => D3 = 2 => F2 = 8
F2 = 2 => F2 = 8 => F2 != 2

step-10
--------------------------------------------------

Highlight implication chain 8
F2 = 8 => I2 != 8 =>
H1 = 8 => H8 != 8 =>
G7 = 8 => D7 != 8 =>
F9 = 8 => CTR => F2 != 8 => F2 = 3

Highlight implication chain 2
I2 = 2 => D2,F2 != 2
I2 = 2 => I4 != 2 => G4 = 2 => G7 != 2 => H8 = 2 => A8 != 2 => A9 = 2
=> F9 != 2 => D7 = 2 => D3 != 2 => D2,F2,D3 != 2 => CTR
=> I2 != 2

step-11
--------------------------------------------------

auto ..

solved.

|:info:|
XYZ-Wing: Z=8, X=2, Y= 3 (no effect)
G4: 2,3,8 + H5: 3,8 + H8: 2,8 => no cells = 8..

* POSITIONS
orig   Original Sudoku                         d:  0 h:  0 521...7.3.6.....5...8...4.1...7...4.....21....72.85...1.3.69..5...13...9..6.7....
===== ======================================== ===== ===== =================================================================================
   0   Solution                                d: 18 h:  0 521948763764213958938657421315796842689421537472385196143869275257134689896572314
   1   Original Sudoku                         d:  0 h:  0 521...7.3.6.....5...8...4.1...7...4.....21....72.85...1.3.69..5...13...9..6.7....
   2   auto solve                              d:  4 h:  0 521.4.7.3.6..1..5...8.5.4.1.1579..4.....215.7.72.85..6143.69.75.571346.9..657...4
   3   G6,H6,G9,H9: 1,3,9 => G7 = 9 or H7 = 9  d:  4 h: 26 521.4.7.3.6..1..5...8.5.4.1.1579..4.....215.7.72.85..6143.69.75.571346.9..657...4
----- ---------------------------------------- ----- ----- ---------------------------------------------------------------------------------
save   => H5 != 9 and A6 != 9                  d:  6 h: 26 521.4.7.3.6..1..5...8.5.4.1.1579..4.....215.7.72.85..6143.69.75.571346.9..657...4
===== ======================================== ===== ===== =================================================================================
view*  auto solve                              d:  8 h: 26 521.4.7.3.6..1..5...8.5.4.1.1579..4.....215.7.72.85..6143.69.75.571346.9..657...4
===== ======================================== ===== ===== =================================================================================
   0   Solution                                d: 18 h:  0 521948763764213958938657421315796842689421537472385196143869275257134689896572314

Solution

position: 521948763764213958938657421315796842689421537472385196143869275257134689896572314 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:

* DIS # A2: 4,9 => CTR => A2: 3,7
* INC # A2: 3,7 => UNS
* INC # A2: 3,9 => UNS
* INC # A3: 3,9 => UNS
* DIS # D3: 3,9 => CTR => D3: 2,6
* INC # D3: 2,6 => UNS
* DIS # B5: 3,9 => CTR => B5: 8
* INC # B5: 8 => UNS
* DIS # D1: 6,8 => CTR => D1: 9
* INC # D1: 9 => UNS
* INC # H1: 6,8 => UNS
* DIS # H1: 9 => CTR => H1: 6,8
* DIS # G2: 2,8 => CTR => G2: 9
* INC # G2: 9 => UNS
* PRF # D2: 2,8 => SOL
* INC # D2: 3,9 => UNS
* DIS # F2: 2,8 => CTR => F2: 3,7
* INC # F2: 3,7 => UNS
* DIS # A5: 4,9 => CTR => A5: 3,6,8
* INC # A5: 3,6,8 => UNS
* INC # A6: 4,9 => UNS
* INC # D5: 3,6 => UNS
* PRF # D5: 4 => SOL
* INC # A4: 3,6 => UNS
* DIS # A4: 8 => CTR => A4: 3,6
* DIS # F3: 3,6 => CTR => F3: 2,7
* INC # F3: 2,7 => UNS
* PRF # D5: 3,4 => SOL
* DIS # D5: 6 => CTR => D5: 3,4
* INC # A6: 3,4 => UNS
* DIS # A6: 9 => CTR => A6: 3,4
* INC # G4: 2,8 => UNS
* DIS # G4: 3 => CTR => G4: 2,8
* INC # A9: 2,8 => UNS
* DIS # A9: 9 => CTR => A9: 2,8
* PRF # A9: 8,9 => SOL
* DIS # A9: 2 => CTR => A9: 8,9
* INC # B5: 8,9 => UNS
* DIS # B5: 3 => CTR => B5: 8,9
* PRF # D2: 2,8 => SOL
* INC # D2: 3,9 => UNS
* INC # A9: 2,8 => UNS
* DIS # A9: 9 => CTR => A9: 2,8
* DIS # F2: 2,8 => CTR => F2: 3,7
* INC # F2: 3,7 => UNS
* DIS # G2: 2,8 => CTR => G2: 9
* INC # G2: 9 => UNS
* INC # G4: 2,8 => UNS
* INC # G6: 1,3 => UNS
* DIS # G6: 9 => CTR => G6: 1,3
* INC # H6: 1,3 => UNS
* INC # H6: 9 => UNS
* CNT  52 HDP CHAINS /  52 HYP OPENED

A2. Pair Reduction

Full list of HDP chains traversed:

* DIS # A2: 4,9 => CTR => A2: 3,7
* INC A2: 3,7 # A3: 3,9 => UNS
* DIS A2: 3,7 # A3: 7 => CTR => A3: 3,9
* DIS A2: 3,7 + A3: 3,9 # D1: 6,8 => CTR => D1: 9
* PRF A2: 3,7 + A3: 3,9 + D1: 9 # D2: 2,8 => SOL
* STA A2: 3,7 + A3: 3,9 + D1: 9 + D2: 2,8
* CNT   5 HDP CHAINS /   5 HYP OPENED