Analysis of xx-ph-00001255-L117-base.sdk

Contents

Original Sudoku

level: hard

Original Sudoku

position: 1....67...5.........9....4......18.37...3.6.....2...9.3....8..1..........425..... initial

Autosolve

position: 1....67...5.........9....4......18.37...3.6.....2...9.3....8..1..........4251.... autosolve
Autosolve

Pair Reduction Variants

Pair Reduction Analysis

Pair Reduction Analysis

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

Pair Reduction

Pair Reduction

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

Deep Pair Reduction

Deep Pair Reduction

Time used: 0:00:47.954722

The following important HDP chains were detected:

* DIS # G8: 3,9 # H2: 1,2 => CTR => H2: 3,6,8
* DIS # G8: 3,9 + H2: 3,6,8 # A2: 6,8 => CTR => A2: 2,4
* DIS # G8: 3,9 + H2: 3,6,8 + A2: 2,4 # A8: 6,8 => CTR => A8: 5,9
* DIS # G8: 3,9 + H2: 3,6,8 + A2: 2,4 + A8: 5,9 # I5: 4,5 => CTR => I5: 2
* DIS # G8: 3,9 + H2: 3,6,8 + A2: 2,4 + A8: 5,9 + I5: 2 # G7: 2 => CTR => G7: 4,5
* DIS # G8: 3,9 + H2: 3,6,8 + A2: 2,4 + A8: 5,9 + I5: 2 + G7: 4,5 # I6: 4,5 => CTR => I6: 7
* PRF # G8: 3,9 + H2: 3,6,8 + A2: 2,4 + A8: 5,9 + I5: 2 + G7: 4,5 + I6: 7 # F8: 3,9 => SOL
* STA # G8: 3,9 + H2: 3,6,8 + A2: 2,4 + A8: 5,9 + I5: 2 + G7: 4,5 + I6: 7 + F8: 3,9
* CNT   7 HDP CHAINS /  32 HYP OPENED

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

Details

Positions

1....67...5.........9....4......18.37...3.6.....2...9.3....8..1..........425..... initial
1....67...5.........9....4......18.37...3.6.....2...9.3....8..1..........4251.... autosolve
123456789457189236689372145264791853795834612831265497376948521518623974942517368 solved

Classification

level: hard

Pairing Analysis

--------------------------------------------------
* PAIRS (1)
G9: 3,9

--------------------------------------------------
* CONSTRAINT PAIRS (AUTO SOLVE)
D2,D3: 1.. / D2 = 1  =>  6 pairs (_) / D3 = 1  =>  1 pairs (_)
H5,G6: 1.. / H5 = 1  =>  6 pairs (_) / G6 = 1  =>  2 pairs (_)
B8,C8: 1.. / B8 = 1  =>  1 pairs (_) / C8 = 1  =>  1 pairs (_)
D3,G3: 1.. / D3 = 1  =>  1 pairs (_) / G3 = 1  =>  6 pairs (_)
H2,H5: 1.. / H2 = 1  =>  2 pairs (_) / H5 = 1  =>  6 pairs (_)
B6,C6: 3.. / B6 = 3  =>  2 pairs (_) / C6 = 3  =>  2 pairs (_)
C2,B3: 7.. / C2 = 7  =>  2 pairs (_) / B3 = 7  =>  2 pairs (_)
H4,I6: 7.. / H4 = 7  =>  2 pairs (_) / I6 = 7  =>  3 pairs (_)
D5,E6: 8.. / D5 = 8  =>  1 pairs (_) / E6 = 8  =>  4 pairs (_)
* DURATION: 0:00:06.584537  START: 17:15:49.659568  END: 17:15:56.244105 2020-11-26
* CP COUNT: (9)
* INCONCLUSIVE

* DEEP PAIR REDUCTION
* DURATION: 0:00:47.764090  START: 17:16:01.495419  END: 17:16:49.259509 2020-11-26
* SOLUTION FOUND
* SAVE PR GRAPH xx-ph-00001255-L117-base-pr-002.dot
* REASONING
* DIS # G8: 3,9 # H2: 1,2 => CTR => H2: 3,6,8
* DIS # G8: 3,9 + H2: 3,6,8 # A2: 6,8 => CTR => A2: 2,4
* DIS # G8: 3,9 + H2: 3,6,8 + A2: 2,4 # A8: 6,8 => CTR => A8: 5,9
* DIS # G8: 3,9 + H2: 3,6,8 + A2: 2,4 + A8: 5,9 # I5: 4,5 => CTR => I5: 2
* DIS # G8: 3,9 + H2: 3,6,8 + A2: 2,4 + A8: 5,9 + I5: 2 # G7: 2 => CTR => G7: 4,5
* DIS # G8: 3,9 + H2: 3,6,8 + A2: 2,4 + A8: 5,9 + I5: 2 + G7: 4,5 # I6: 4,5 => CTR => I6: 7
* PRF # G8: 3,9 + H2: 3,6,8 + A2: 2,4 + A8: 5,9 + I5: 2 + G7: 4,5 + I6: 7 # F8: 3,9 => SOL
* STA # G8: 3,9 + H2: 3,6,8 + A2: 2,4 + A8: 5,9 + I5: 2 + G7: 4,5 + I6: 7 + F8: 3,9
* CNT   7 HDP CHAINS /  32 HYP OPENED

Header Info

1255;L117;elev;20;11.30;1.50;1.50

Solution

position: 123456789457189236689372145264791853795834612831265497376948521518623974942517368 solved
Solution

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

Appendix: Full HDP Chains

A1. Pair Reduction Analysis

Full list of HDP chains traversed:

* INC # G8: 3,9 => UNS
* INC # G8: 2,4,5 => UNS
* INC # F9: 3,9 => UNS
* INC # F9: 7 => UNS
* INC # G2: 3,9 => UNS
* INC # G2: 1,2 => UNS
* CNT   6 HDP CHAINS /   6 HYP OPENED

A2. Pair Reduction

Full list of HDP chains traversed:

* INC # G8: 3,9 => UNS
* INC # G8: 2,4,5 => UNS
* INC # F9: 3,9 => UNS
* INC # F9: 7 => UNS
* INC # G2: 3,9 => UNS
* INC # G2: 1,2 => UNS
* CNT   6 HDP CHAINS /   6 HYP OPENED

A3. Deep Pair Reduction

Full list of HDP chains traversed:

* INC # G8: 3,9 => UNS
* INC # G8: 2,4,5 => UNS
* INC # F9: 3,9 => UNS
* INC # F9: 7 => UNS
* INC # G2: 3,9 => UNS
* INC # G2: 1,2 => UNS
* DIS # G8: 3,9 # H2: 1,2 => CTR => H2: 3,6,8
* INC # G8: 3,9 + H2: 3,6,8 # G3: 1,2 => UNS
* INC # G8: 3,9 + H2: 3,6,8 # G3: 1,2 => UNS
* INC # G8: 3,9 + H2: 3,6,8 # G3: 5 => UNS
* INC # G8: 3,9 + H2: 3,6,8 # D8: 3,9 => UNS
* INC # G8: 3,9 + H2: 3,6,8 # F8: 3,9 => UNS
* INC # G8: 3,9 + H2: 3,6,8 # F9: 3,9 => UNS
* INC # G8: 3,9 + H2: 3,6,8 # F9: 7 => UNS
* INC # G8: 3,9 + H2: 3,6,8 # G3: 1,2 => UNS
* INC # G8: 3,9 + H2: 3,6,8 # G3: 5 => UNS
* DIS # G8: 3,9 + H2: 3,6,8 # A2: 6,8 => CTR => A2: 2,4
* INC # G8: 3,9 + H2: 3,6,8 + A2: 2,4 # A3: 6,8 => UNS
* DIS # G8: 3,9 + H2: 3,6,8 + A2: 2,4 # A8: 6,8 => CTR => A8: 5,9
* INC # G8: 3,9 + H2: 3,6,8 + A2: 2,4 + A8: 5,9 # A9: 6,8 => UNS
* INC # G8: 3,9 + H2: 3,6,8 + A2: 2,4 + A8: 5,9 # A3: 6,8 => UNS
* INC # G8: 3,9 + H2: 3,6,8 + A2: 2,4 + A8: 5,9 # A9: 6,8 => UNS
* DIS # G8: 3,9 + H2: 3,6,8 + A2: 2,4 + A8: 5,9 # I5: 4,5 => CTR => I5: 2
* INC # G8: 3,9 + H2: 3,6,8 + A2: 2,4 + A8: 5,9 + I5: 2 # I6: 4,5 => UNS
* INC # G8: 3,9 + H2: 3,6,8 + A2: 2,4 + A8: 5,9 + I5: 2 # I6: 4,5 => UNS
* INC # G8: 3,9 + H2: 3,6,8 + A2: 2,4 + A8: 5,9 + I5: 2 # I6: 7 => UNS
* INC # G8: 3,9 + H2: 3,6,8 + A2: 2,4 + A8: 5,9 + I5: 2 # G7: 4,5 => UNS
* DIS # G8: 3,9 + H2: 3,6,8 + A2: 2,4 + A8: 5,9 + I5: 2 # G7: 2 => CTR => G7: 4,5
* DIS # G8: 3,9 + H2: 3,6,8 + A2: 2,4 + A8: 5,9 + I5: 2 + G7: 4,5 # I6: 4,5 => CTR => I6: 7
* INC # G8: 3,9 + H2: 3,6,8 + A2: 2,4 + A8: 5,9 + I5: 2 + G7: 4,5 + I6: 7 # D8: 3,9 => UNS
* PRF # G8: 3,9 + H2: 3,6,8 + A2: 2,4 + A8: 5,9 + I5: 2 + G7: 4,5 + I6: 7 # F8: 3,9 => SOL
* STA # G8: 3,9 + H2: 3,6,8 + A2: 2,4 + A8: 5,9 + I5: 2 + G7: 4,5 + I6: 7 + F8: 3,9
* CNT  31 HDP CHAINS /  32 HYP OPENED