Analysis of zz-www.sudokuwiki.org-nine-empty-units.sdk

Contents

http://www.sudokuwiki.org/Interesting_Sudokus

level: medium

http://www.sudokuwiki.org/Interesting_Sudokus

position: 2.71.4............6.43.8...5.8...1.4.........7.6...5.9...4.19.5............9.57.6 initial

Autosolve

position: 2.71.4............6.43.82..5.8...1.4...5.....7.68..5.9...4.19.59.5.8.......9.57.6 autosolve
Autosolve

Pair Reduction Variants

Pair Reduction Analysis

Pair Reduction Analysis

The following important HDP chains were detected:

* DIS # H2: 5,9 => CTR => H2: 1,4
* DIS # I2: 3,8 => CTR => I2: 1,7
* DIS # I5: 3,8 => CTR => I5: 2
* DIS # I2: 3,8 => CTR => I2: 1,7
* DIS # B5: 1,4 => CTR => B5: 2,3,9
* DIS # B5: 1,4 => CTR => B5: 2,3,9
* DIS # E4: 6,7 => CTR => E4: 2,3,9
* DIS # F4: 6,7 => CTR => F4: 2,3,9
* DIS # E4: 6,7 => CTR => E4: 2,3,9
* DIS # F4: 6,7 => CTR => F4: 2,3,9
* DIS # I5: 3,8 => CTR => I5: 2
* DIS # I5: 8 => CTR => I5: 2,3
* DIS # E4: 6,7 => CTR => E4: 2,3,9
* DIS # H2: 5,9 => CTR => H2: 1,4
* CNT  14 HDP CHAINS /  83 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 # H2: 5,9 => CTR => H2: 1,4
* DIS H2: 1,4 # I2: 3,8 => CTR => I2: 1,7
* DIS H2: 1,4 + I2: 1,7 # I5: 3,8 => CTR => I5: 2
* PRF H2: 1,4 + I2: 1,7 + I5: 2 => SOL
* STA H2: 1,4 + I2: 1,7 + I5: 2
* CNT   4 HDP CHAINS /   9 HYP OPENED

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

Details

Positions

2.71.4............6.43.8...5.8...1.4.........7.6...5.9...4.19.5............9.57.6 initial
2.71.4............6.43.82..5.8...1.4...5.....7.68..5.9...4.19.59.5.8.......9.57.6 autosolve
297164358853729641614358297528693174139547862746812539362471985975286413481935726 solved

Classification

level: medium

Pairing Analysis

--------------------------------------------------
* PAIRS (21)
H1: 5,9
I1: 3,8
I3: 1,7
B4: 2,3
B6: 1,4
E5: 1,4
F5: 6,7
E6: 1,4
F6: 2,3
H4: 6,7
G5: 3,8
H5: 6,7
H6: 2,3
A7: 3,8
B7: 6,7
C7: 2,3
B8: 6,7
E7: 6,7
E9: 2,3
G8: 3,4
H8: 1,4

--------------------------------------------------
* CONSTRAINT PAIRS (AUTO SOLVE)
E5,E6: 1.. / E5 = 1  => 20 pairs (_) / E6 = 1  => 19 pairs (_)
H8,I8: 1.. / H8 = 1  => 22 pairs (_) / I8 = 1  =>  0 pairs (X)
B6,E6: 1.. / B6 = 1  => 20 pairs (_) / E6 = 1  => 19 pairs (_)
I5,H6: 2.. / I5 = 2  => 27 pairs (_) / H6 = 2  =>  0 pairs (X)
F6,H6: 2.. / F6 = 2  => 27 pairs (_) / H6 = 2  =>  0 pairs (X)
C7,H7: 2.. / C7 = 2  => 22 pairs (_) / H7 = 2  => 29 pairs (_)
I5,I8: 2.. / I5 = 2  => 27 pairs (_) / I8 = 2  =>  0 pairs (X)
F8,E9: 3.. / F8 = 3  =>  0 pairs (X) / E9 = 3  => 27 pairs (_)
F6,H6: 3.. / F6 = 3  =>  0 pairs (X) / H6 = 3  => 27 pairs (_)
E4,E9: 3.. / E4 = 3  =>  0 pairs (X) / E9 = 3  => 27 pairs (_)
G2,H2: 4.. / G2 = 4  =>  0 pairs (X) / H2 = 4  => 22 pairs (_)
E5,E6: 4.. / E5 = 4  => 19 pairs (_) / E6 = 4  => 20 pairs (_)
A9,B9: 4.. / A9 = 4  => 22 pairs (_) / B9 = 4  => 21 pairs (_)
G8,H8: 4.. / G8 = 4  => 22 pairs (_) / H8 = 4  =>  0 pairs (X)
B6,E6: 4.. / B6 = 4  => 19 pairs (_) / E6 = 4  => 20 pairs (_)
A5,A9: 4.. / A5 = 4  => 21 pairs (_) / A9 = 4  => 22 pairs (_)
G2,G8: 4.. / G2 = 4  =>  0 pairs (X) / G8 = 4  => 22 pairs (_)
H2,H8: 4.. / H2 = 4  => 22 pairs (_) / H8 = 4  =>  0 pairs (X)
G1,G2: 6.. / G1 = 6  => 23 pairs (_) / G2 = 6  => 21 pairs (_)
H4,H5: 6.. / H4 = 6  => 19 pairs (_) / H5 = 6  => 19 pairs (_)
B7,B8: 6.. / B7 = 6  => 19 pairs (_) / B8 = 6  => 21 pairs (_)
E1,G1: 6.. / E1 = 6  => 21 pairs (_) / G1 = 6  => 23 pairs (_)
F5,H5: 6.. / F5 = 6  => 19 pairs (_) / H5 = 6  => 19 pairs (_)
B7,E7: 6.. / B7 = 6  => 19 pairs (_) / E7 = 6  => 21 pairs (_)
I2,I3: 7.. / I2 = 7  => 23 pairs (_) / I3 = 7  => 21 pairs (_)
H4,H5: 7.. / H4 = 7  => 19 pairs (_) / H5 = 7  => 19 pairs (_)
B7,B8: 7.. / B7 = 7  => 21 pairs (_) / B8 = 7  => 19 pairs (_)
E3,I3: 7.. / E3 = 7  => 23 pairs (_) / I3 = 7  => 21 pairs (_)
F5,H5: 7.. / F5 = 7  => 19 pairs (_) / H5 = 7  => 19 pairs (_)
B7,E7: 7.. / B7 = 7  => 21 pairs (_) / E7 = 7  => 19 pairs (_)
G5,I5: 8.. / G5 = 8  => 22 pairs (_) / I5 = 8  =>  0 pairs (X)
H7,H9: 8.. / H7 = 8  => 26 pairs (_) / H9 = 8  => 22 pairs (_)
A7,H7: 8.. / A7 = 8  => 22 pairs (_) / H7 = 8  => 26 pairs (_)
B5,C5: 9.. / B5 = 9  => 22 pairs (_) / C5 = 9  => 22 pairs (_)
E4,F4: 9.. / E4 = 9  => 27 pairs (_) / F4 = 9  => 21 pairs (_)
C2,C5: 9.. / C2 = 9  => 22 pairs (_) / C5 = 9  => 22 pairs (_)
F2,F4: 9.. / F2 = 9  => 27 pairs (_) / F4 = 9  => 21 pairs (_)
* DURATION: 0:00:57.623102  START: 02:32:37.947159  END: 02:33:35.570261 2019-05-02
* CP COUNT: (37)
* CLUE FOUND

--------------------------------------------------
* PREPARE PR GRAPH
* PAIR REDUCTION ..
* LEVEL 0 PASS 1 ROUND 1 (AUTO SOLVE) (A7,B4,B6,B7,B8,C7,E5,E6,E7,E9,F5,F6,G5,G8,H1,H4,H5,H6,H8,I1,I3)
* 2.71.4............6.43.82..5.8...1.4...5.....7.68..5.9...4.19.59.5.8.......9.57.6
* PAIR H1: 5,9 BLK 3
H2: 5,9,1,4                              # reduction candidate for 5,9
H2: 5,9 => CTR
* 2.71.46......2945.6.43.8217528..31.4...5..8.27.68.2539...4.19.59.528.341...9357.6
H2: 1,4                                  # 23 pairs
H3: 5,9,1                                # reduction candidate for 5,9
H3: 5,9                                  # 23 pairs
* PAIR H1: 5,9 ROW 1
B1: 5,9,3,8                              # reduction candidate for 5,9
B1: 5,9                                  # 21 pairs
E1: 5,9,6                                # reduction candidate for 5,9
E1: 5,9                                  # 23 pairs
* PAIR I1: 3,8 BLK 3
G1: 3,8,6                                # reduction candidate for 3,8
G1: 3,8                                  # 21 pairs
G2: 3,8,4,6                              # reduction candidate for 3,8
G2: 3,8                                  # 25 pairs
I2: 3,8,1,7                              # reduction candidate for 3,8
I2: 3,8 => CTR
* 2.71.46......294..6.43582.7528..31.4...5..8.27.68.2539...4.19.59.528.341...9357.6
I2: 1,7                                  # 22 pairs
* PAIR I1: 3,8 ROW 1
B1: 3,8,5,9                              # reduction candidate for 3,8
B1: 3,8                                  # 23 pairs
B1: 5,9                                  # 21 pairs
* PAIR I1: 3,8 COL I
I5: 3,8,2                                # reduction candidate for 3,8
I5: 3,8 => CTR
* 2.71.4............6.43.82..5.8.3.1.4...5.....7.68..529..24.19.59.5.8...2...9257.6
I5: 2                                    # 27 pairs
* PAIR I3: 1,7 BLK 3
I2: 1,7,3,8                              # reduction candidate for 1,7
I2: 3,8 => CTR
* 2.71.46......294..6.43582.7528..31.4...5..8.27.68.2539...4.19.59.528.341...9357.6
I2: 1,7                                  # 22 pairs
* PAIR B4: 2,3 BLK 4
B5: 2,3,1,4,9                            # reduction candidate for 2,3
B5: 2,3                                  # 24 pairs
C5: 2,3,1,9                              # reduction candidate for 2,3
C5: 2,3                                  # 24 pairs
* PAIR B4: 2,3 ROW 4
E4: 2,3,6,7,9                            # reduction candidate for 2,3
E4: 2,3                                  # 23 pairs
F4: 2,3,6,7,9                            # reduction candidate for 2,3
F4: 2,3                                  # 27 pairs
* PAIR B4: 2,3 COL B
B9: 2,3,1,4,8                            # reduction candidate for 2,3
B9: 2,3                                  # 25 pairs
B9: 1,4,8                                # 21 pairs
* PAIR B6: 1,4 BLK 4
A5: 1,4,3                                # reduction candidate for 1,4
A5: 1,4                                  # 22 pairs
B5: 1,4,2,3,9                            # reduction candidate for 1,4
B5: 1,4 => CTR
* 2.71.4.......2....6.43.82..528..31.43.95..8.27.68.25398.34.19259.528....412935786
B5: 2,3,9                                # 21 pairs
* PAIR B6: 1,4 COL B
B9: 1,4,2,3,8                            # reduction candidate for 1,4
B9: 1,4                                  # 24 pairs
B9: 2,3,8                                # 23 pairs
* PAIR E5: 1,4 ROW 5
A5: 1,4,3                                # reduction candidate for 1,4
A5: 1,4                                  # 22 pairs
B5: 1,4,2,3,9                            # reduction candidate for 1,4
B5: 1,4 => CTR
* 2.71.4.......2....6.43.82..528..31.43.95..8.27.68.25398.34.19259.528....412935786
B5: 2,3,9                                # 21 pairs
* PAIR F5: 6,7 BLK 5
D4: 6,7,2                                # reduction candidate for 6,7
D4: 6,7                                  # 22 pairs
E4: 6,7,2,3,9                            # reduction candidate for 6,7
E4: 6,7 => CTR
* 2.71.4............6.43.82..5.8..91.4...5.....7.68.3529..24.19.59.5.8...2...9.57.6
E4: 2,3,9                                # 21 pairs
F4: 6,7,2,3,9                            # reduction candidate for 6,7
F4: 6,7 => CTR
* 2.71.4........9...6.43.82..5.8.9.1.4..95.....7.68.3529..24.19.59.5.82......9.57.6
F4: 2,3,9                                # 21 pairs
* PAIR F5: 6,7 COL F
F2: 6,7,2,9                              # reduction candidate for 6,7
F2: 6,7                                  # 24 pairs
F8: 6,7,2,3                              # reduction candidate for 6,7
F8: 6,7                                  # 27 pairs
* PAIR F6: 2,3 BLK 5
E4: 2,3,6,7,9                            # reduction candidate for 2,3
E4: 2,3                                  # 23 pairs
F4: 2,3,6,7,9                            # reduction candidate for 2,3
F4: 2,3                                  # 27 pairs
* PAIR F6: 2,3 COL F
F8: 2,3,6,7                              # reduction candidate for 2,3
F8: 6,7                                  # 27 pairs
F8: 2,3                                  # 23 pairs
* PAIR H4: 6,7 ROW 4
D4: 6,7,2                                # reduction candidate for 6,7
D4: 6,7                                  # 22 pairs
E4: 6,7,2,3,9                            # reduction candidate for 6,7
E4: 6,7 => CTR
* 2.71.4............6.43.82..5.8..91.4...5.....7.68.3529..24.19.59.5.8...2...9.57.6
E4: 2,3,9                                # 21 pairs
F4: 6,7,2,3,9                            # reduction candidate for 6,7
F4: 6,7 => CTR
* 2.71.4........9...6.43.82..5.8.9.1.4..95.....7.68.3529..24.19.59.5.82......9.57.6
F4: 2,3,9                                # 21 pairs
* PAIR G5: 3,8 BLK 6
I5: 3,8,2                                # reduction candidate for 3,8
I5: 3,8 => CTR
* 2.71.4............6.43.82..5.8.3.1.4...5.....7.68..529..24.19.59.5.8...2...9257.6
I5: 2                                    # 27 pairs
* PAIR G5: 3,8 COL G
G1: 3,8,6                                # reduction candidate for 3,8
G1: 3,8                                  # 21 pairs
G2: 3,8,4,6                              # reduction candidate for 3,8
G2: 3,8                                  # 25 pairs
* PAIR H6: 2,3 BLK 6
I5: 2,3,8                                # reduction candidate for 2,3
I5: 8 => CTR
* 2.71.4..3.........6.43.82..5.8.3.1.4...5....87.68..529..24.19.59.5.8...2...9257.6
I5: 2,3                                  # 22 pairs
* PAIR H6: 2,3 COL H
H7: 2,3,8                                # reduction candidate for 2,3
H7: 2,3                                  # 22 pairs
H9: 2,3,8                                # reduction candidate for 2,3
H9: 2,3                                  # 26 pairs
* PAIR A7: 3,8 BLK 7
A9: 3,8,1,4                              # reduction candidate for 3,8
A9: 3,8                                  # 22 pairs
B9: 3,8,1,2,4                            # reduction candidate for 3,8
B9: 3,8                                  # 25 pairs
* PAIR A7: 3,8 ROW 7
H7: 3,8,2                                # reduction candidate for 3,8
H7: 2                                    # 29 pairs
H7: 3,8                                  # 22 pairs
* PAIR A7: 3,8 COL A
A2: 3,8,1                                # reduction candidate for 3,8
A2: 3,8                                  # 24 pairs
A2: 1                                    # 24 pairs
* PAIR C7: 2,3 BLK 7
B9: 2,3,1,4,8                            # reduction candidate for 2,3
B9: 2,3                                  # 25 pairs
C9: 2,3,1                                # reduction candidate for 2,3
C9: 2,3                                  # 28 pairs
* PAIR C7: 2,3 ROW 7
H7: 2,3,8                                # reduction candidate for 2,3
H7: 8                                    # 26 pairs
H7: 2,3                                  # 22 pairs
* PAIR C7: 2,3 COL C
C5: 2,3,1,9                              # reduction candidate for 2,3
C5: 2,3                                  # 24 pairs
C5: 1,9                                  # 22 pairs
* PAIR B8: 6,7 ROW 8
D8: 6,7,2                                # reduction candidate for 6,7
D8: 6,7                                  # 23 pairs
F8: 6,7,2,3                              # reduction candidate for 6,7
F8: 6,7                                  # 27 pairs
* PAIR E7: 6,7 BLK 8
D8: 6,7,2                                # reduction candidate for 6,7
D8: 6,7                                  # 23 pairs
F8: 6,7,2,3                              # reduction candidate for 6,7
F8: 6,7                                  # 27 pairs
* PAIR E7: 6,7 COL E
E2: 6,7,2,5,9                            # reduction candidate for 6,7
E2: 6,7                                  # 26 pairs
E4: 6,7,2,3,9                            # reduction candidate for 6,7
E4: 6,7 => CTR
* 2.71.4............6.43.82..5.8..91.4...5.....7.68.3529..24.19.59.5.8...2...9.57.6
E4: 2,3,9                                # 21 pairs
* PAIR E9: 2,3 BLK 8
F8: 2,3,6,7                              # reduction candidate for 2,3
F8: 6,7                                  # 27 pairs
F8: 2,3                                  # 23 pairs
* PAIR E9: 2,3 ROW 9
B9: 2,3,1,4,8                            # reduction candidate for 2,3
B9: 2,3                                  # 25 pairs
C9: 2,3,1                                # reduction candidate for 2,3
C9: 2,3                                  # 28 pairs
H9: 2,3,8                                # reduction candidate for 2,3
H9: 2,3                                  # 26 pairs
* PAIR E9: 2,3 COL E
E4: 2,3,6,7,9                            # reduction candidate for 2,3
E4: 6,7,9                                # 27 pairs
E4: 2,3                                  # 23 pairs
* PAIR G8: 3,4 COL G
G2: 3,4,6,8                              # reduction candidate for 3,4
G2: 3,4                                  # 24 pairs
G2: 6,8                                  # 23 pairs
* PAIR H8: 1,4 COL H
H2: 1,4,5,9                              # reduction candidate for 1,4
H2: 5,9 => CTR
* 2.71.46......2945.6.43.8217528..31.4...5..8.27.68.2539...4.19.59.528.341...9357.6
H2: 1,4                                  # 23 pairs
* INCONCLUSIVE
* SAVE PR GRAPH zz-www.sudokuwiki.org-nine-empty-units-pr-000.dot
* REASONING
* DIS # H2: 5,9 => CTR => H2: 1,4
* DIS # I2: 3,8 => CTR => I2: 1,7
* DIS # I5: 3,8 => CTR => I5: 2
* DIS # I2: 3,8 => CTR => I2: 1,7
* DIS # B5: 1,4 => CTR => B5: 2,3,9
* DIS # B5: 1,4 => CTR => B5: 2,3,9
* DIS # E4: 6,7 => CTR => E4: 2,3,9
* DIS # F4: 6,7 => CTR => F4: 2,3,9
* DIS # E4: 6,7 => CTR => E4: 2,3,9
* DIS # F4: 6,7 => CTR => F4: 2,3,9
* DIS # I5: 3,8 => CTR => I5: 2
* DIS # I5: 8 => CTR => I5: 2,3
* DIS # E4: 6,7 => CTR => E4: 2,3,9
* DIS # H2: 5,9 => CTR => H2: 1,4
* CNT  14 HDP CHAINS /  83 HYP OPENED

--------------------------------------------------
* PREPARE PR GRAPH
* PAIR REDUCTION ..
* LEVEL 0 PASS 1 ROUND 1 (AUTO SOLVE) (A7,B4,B6,B7,B8,C7,E5,E6,E7,E9,F5,F6,G5,G8,H1,H4,H5,H6,H8,I1,I3)
* 2.71.4............6.43.82..5.8...1.4...5.....7.68..5.9...4.19.59.5.8.......9.57.6
* PAIR H1: 5,9 BLK 3
H2: 5,9,1,4                              # reduction candidate for 5,9
H2: 5,9 => CTR
* 2.71.46......2945.6.43.8217528..31.4...5..8.27.68.2539...4.19.59.528.341...9357.6
* RESTART
* PAIR H1: 5,9 ROW 1
B1: 5,9,3,8                              # reduction candidate for 5,9
B1: 5,9                                  # 21 pairs
E1: 5,9,6                                # reduction candidate for 5,9
E1: 5,9                                  # 25 pairs
* PAIR I1: 3,8 BLK 3
G1: 3,8,6                                # reduction candidate for 3,8
G1: 3,8                                  # 21 pairs
G2: 3,8,4,6                              # reduction candidate for 3,8
G2: 3,8                                  # 25 pairs
I2: 3,8,1,7                              # reduction candidate for 3,8
I2: 3,8 => CTR
* 2.71.46.885..294136143.82.7528..31.41..54.8.2746812539..24.19859.528.341481935726
* PAIR I1: 3,8 ROW 1
B1: 3,8,5,9                              # reduction candidate for 3,8
B1: 3,8                                  # 25 pairs
B1: 5,9                                  # 21 pairs
* PAIR I1: 3,8 COL I
I5: 3,8,2                                # reduction candidate for 3,8
I5: 3,8 => CTR
* 2.71.4..........4.6.43.82..5.8.3.1.4...5.....7.68..529..24.19.59.5.8.412...9257.6
I5: 2 => SOLVED
* 297164358853729641614358297528693174139547862746812539362471985975286413481935726
* DURATION: 0:00:10.628427  START: 02:34:44.088051  END: 02:34:54.716478 2019-05-02
* SOLUTION FOUND
* SAVE PR GRAPH zz-www.sudokuwiki.org-nine-empty-units-pr-001.dot
* REASONING
* DIS # H2: 5,9 => CTR => H2: 1,4
* DIS H2: 1,4 # I2: 3,8 => CTR => I2: 1,7
* DIS H2: 1,4 + I2: 1,7 # I5: 3,8 => CTR => I5: 2
* PRF H2: 1,4 + I2: 1,7 + I5: 2 => SOL
* STA H2: 1,4 + I2: 1,7 + I5: 2
* CNT   4 HDP CHAINS /   9 HYP OPENED

Header Info

http://www.sudokuwiki.org/Interesting_Sudokus

Nine empty units. Could be wrong, but I can't believe there can be more than nine.

Discovered by Klaus Brenner

Solution

position: 297164358853729641614358297528693174139547862746812539362471985975286413481935726 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 # H2: 5,9 => CTR => H2: 1,4
* INC # H2: 1,4 => UNS
* INC # H3: 5,9 => UNS
* INC # B1: 5,9 => UNS
* INC # E1: 5,9 => UNS
* INC # G1: 3,8 => UNS
* INC # G2: 3,8 => UNS
* DIS # I2: 3,8 => CTR => I2: 1,7
* INC # I2: 1,7 => UNS
* INC # B1: 3,8 => UNS
* INC # B1: 5,9 => UNS
* DIS # I5: 3,8 => CTR => I5: 2
* INC # I5: 2 => UNS
* INC # I2: 1,7 => UNS
* DIS # I2: 3,8 => CTR => I2: 1,7
* INC # B5: 2,3 => UNS
* INC # C5: 2,3 => UNS
* INC # E4: 2,3 => UNS
* INC # F4: 2,3 => UNS
* INC # B9: 2,3 => UNS
* INC # B9: 1,4,8 => UNS
* INC # A5: 1,4 => UNS
* DIS # B5: 1,4 => CTR => B5: 2,3,9
* INC # B5: 2,3,9 => UNS
* INC # B9: 1,4 => UNS
* INC # B9: 2,3,8 => UNS
* INC # A5: 1,4 => UNS
* DIS # B5: 1,4 => CTR => B5: 2,3,9
* INC # B5: 2,3,9 => UNS
* INC # D4: 6,7 => UNS
* DIS # E4: 6,7 => CTR => E4: 2,3,9
* INC # E4: 2,3,9 => UNS
* DIS # F4: 6,7 => CTR => F4: 2,3,9
* INC # F4: 2,3,9 => UNS
* INC # F2: 6,7 => UNS
* INC # F8: 6,7 => UNS
* INC # E4: 2,3 => UNS
* INC # F4: 2,3 => UNS
* INC # F8: 2,3 => UNS
* INC # F8: 6,7 => UNS
* INC # D4: 6,7 => UNS
* DIS # E4: 6,7 => CTR => E4: 2,3,9
* INC # E4: 2,3,9 => UNS
* DIS # F4: 6,7 => CTR => F4: 2,3,9
* INC # F4: 2,3,9 => UNS
* DIS # I5: 3,8 => CTR => I5: 2
* INC # I5: 2 => UNS
* INC # G1: 3,8 => UNS
* INC # G2: 3,8 => UNS
* INC # I5: 2,3 => UNS
* DIS # I5: 8 => CTR => I5: 2,3
* INC # H7: 2,3 => UNS
* INC # H9: 2,3 => UNS
* INC # A9: 3,8 => UNS
* INC # B9: 3,8 => UNS
* INC # H7: 3,8 => UNS
* INC # H7: 2 => UNS
* INC # A2: 3,8 => UNS
* INC # A2: 1 => UNS
* INC # B9: 2,3 => UNS
* INC # C9: 2,3 => UNS
* INC # H7: 2,3 => UNS
* INC # H7: 8 => UNS
* INC # C5: 2,3 => UNS
* INC # C5: 1,9 => UNS
* INC # D8: 6,7 => UNS
* INC # F8: 6,7 => UNS
* INC # D8: 6,7 => UNS
* INC # F8: 6,7 => UNS
* INC # E2: 6,7 => UNS
* DIS # E4: 6,7 => CTR => E4: 2,3,9
* INC # E4: 2,3,9 => UNS
* INC # F8: 2,3 => UNS
* INC # F8: 6,7 => UNS
* INC # B9: 2,3 => UNS
* INC # C9: 2,3 => UNS
* INC # H9: 2,3 => UNS
* INC # E4: 2,3 => UNS
* INC # E4: 6,7,9 => UNS
* INC # G2: 3,4 => UNS
* INC # G2: 6,8 => UNS
* INC # H2: 1,4 => UNS
* DIS # H2: 5,9 => CTR => H2: 1,4
* CNT  83 HDP CHAINS /  83 HYP OPENED

A2. Pair Reduction

Full list of HDP chains traversed:

* DIS # H2: 5,9 => CTR => H2: 1,4
* INC H2: 1,4 # B1: 5,9 => UNS
* INC H2: 1,4 # E1: 5,9 => UNS
* INC H2: 1,4 # G1: 3,8 => UNS
* INC H2: 1,4 # G2: 3,8 => UNS
* DIS H2: 1,4 # I2: 3,8 => CTR => I2: 1,7
* INC H2: 1,4 + I2: 1,7 # B1: 3,8 => UNS
* INC H2: 1,4 + I2: 1,7 # B1: 5,9 => UNS
* DIS H2: 1,4 + I2: 1,7 # I5: 3,8 => CTR => I5: 2
* PRF H2: 1,4 + I2: 1,7 + I5: 2 => SOL
* STA H2: 1,4 + I2: 1,7 + I5: 2
* CNT  10 HDP CHAINS /   9 HYP OPENED