Analysis of xx-ph-00036038-12_05-base.sdk

Contents

Original Sudoku

level: hard

Original Sudoku

position: 98.7..6..75.....8...6.......4..3......754..2...56...7...98...6.....62..1......2.. initial

Autosolve

position: 98.7..6..75...6.8...6.......4..37.....754..2...56...7...98...6.....62..1......2.. 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: 0:00:21.814910

The following important HDP chains were detected:

* DIS # B7: 3,7 # C1: 1,4 => CTR => C1: 2,3
* DIS # B7: 3,7 + C1: 2,3 # C2: 2,3 => CTR => C2: 1,4
* DIS # B7: 3,7 + C1: 2,3 + C2: 1,4 # F3: 1,4 => CTR => F3: 3,5,9
* DIS # B7: 3,7 + C1: 2,3 + C2: 1,4 + F3: 3,5,9 # G3: 1,4 => CTR => G3: 5,7,9
* DIS # B7: 3,7 + C1: 2,3 + C2: 1,4 + F3: 3,5,9 + G3: 5,7,9 # H3: 1,4 => CTR => H3: 5,9
* DIS # B7: 3,7 + C1: 2,3 + C2: 1,4 + F3: 3,5,9 + G3: 5,7,9 + H3: 5,9 # D3: 3,9 => CTR => D3: 1,4
* DIS # B7: 3,7 + C1: 2,3 + C2: 1,4 + F3: 3,5,9 + G3: 5,7,9 + H3: 5,9 + D3: 1,4 # C9: 4,8 => CTR => C9: 1
* DIS # B7: 3,7 + C1: 2,3 + C2: 1,4 + F3: 3,5,9 + G3: 5,7,9 + H3: 5,9 + D3: 1,4 + C9: 1 => CTR => B7: 1,2
* PRF B7: 1,2 # B9: 3,7 # A3: 1,2 => SOL
* STA B7: 1,2 # B9: 3,7 + A3: 1,2
* CNT   9 HDP CHAINS /  32 HYP OPENED

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

Details

Positions

98.7..6..75.....8...6.......4..3......754..2...56...7...98...6.....62..1......2.. initial
98.7..6..75...6.8...6.......4..37.....754..2...56...7...98...6.....62..1......2.. autosolve
984753612753216489216984537842137956167549823395628174429871365538462791671395248 solved

Classification

level: hard

Pairing Analysis

--------------------------------------------------
* PAIRS (1)
B8: 3,7

--------------------------------------------------
* CONSTRAINT PAIRS (AUTO SOLVE)
D4,E6: 2.. / D4 = 2  =>  3 pairs (_) / E6 = 2  =>  4 pairs (_)
A7,B7: 2.. / A7 = 2  =>  1 pairs (_) / B7 = 2  =>  2 pairs (_)
G6,I6: 4.. / G6 = 4  =>  1 pairs (_) / I6 = 4  =>  1 pairs (_)
I4,I5: 6.. / I4 = 6  =>  1 pairs (_) / I5 = 6  =>  1 pairs (_)
A9,B9: 6.. / A9 = 6  =>  2 pairs (_) / B9 = 6  =>  1 pairs (_)
A4,I4: 6.. / A4 = 6  =>  1 pairs (_) / I4 = 6  =>  1 pairs (_)
B5,B9: 6.. / B5 = 6  =>  2 pairs (_) / B9 = 6  =>  1 pairs (_)
G3,I3: 7.. / G3 = 7  =>  0 pairs (_) / I3 = 7  =>  1 pairs (_)
E7,E9: 7.. / E7 = 7  =>  4 pairs (_) / E9 = 7  =>  2 pairs (_)
B8,G8: 7.. / B8 = 7  =>  0 pairs (_) / G8 = 7  =>  5 pairs (_)
E3,F3: 8.. / E3 = 8  =>  1 pairs (_) / F3 = 8  =>  6 pairs (_)
G8,I9: 8.. / G8 = 8  =>  1 pairs (_) / I9 = 8  =>  1 pairs (_)
E3,E6: 8.. / E3 = 8  =>  1 pairs (_) / E6 = 8  =>  6 pairs (_)
B5,B6: 9.. / B5 = 9  =>  2 pairs (_) / B6 = 9  =>  2 pairs (_)
* DURATION: 0:00:08.782600  START: 00:43:53.464614  END: 00:44:02.247214 2020-12-17
* CP COUNT: (14)
* INCONCLUSIVE

* DEEP PAIR REDUCTION
* DURATION: 0:00:21.696965  START: 00:44:05.766446  END: 00:44:27.463411 2020-12-17
* SOLUTION FOUND
* SAVE PR GRAPH xx-ph-00036038-12_05-base-pr-002.dot
* REASONING
* DIS # B7: 3,7 # C1: 1,4 => CTR => C1: 2,3
* DIS # B7: 3,7 + C1: 2,3 # C2: 2,3 => CTR => C2: 1,4
* DIS # B7: 3,7 + C1: 2,3 + C2: 1,4 # F3: 1,4 => CTR => F3: 3,5,9
* DIS # B7: 3,7 + C1: 2,3 + C2: 1,4 + F3: 3,5,9 # G3: 1,4 => CTR => G3: 5,7,9
* DIS # B7: 3,7 + C1: 2,3 + C2: 1,4 + F3: 3,5,9 + G3: 5,7,9 # H3: 1,4 => CTR => H3: 5,9
* DIS # B7: 3,7 + C1: 2,3 + C2: 1,4 + F3: 3,5,9 + G3: 5,7,9 + H3: 5,9 # D3: 3,9 => CTR => D3: 1,4
* DIS # B7: 3,7 + C1: 2,3 + C2: 1,4 + F3: 3,5,9 + G3: 5,7,9 + H3: 5,9 + D3: 1,4 # C9: 4,8 => CTR => C9: 1
* DIS # B7: 3,7 + C1: 2,3 + C2: 1,4 + F3: 3,5,9 + G3: 5,7,9 + H3: 5,9 + D3: 1,4 + C9: 1 => CTR => B7: 1,2
* PRF B7: 1,2 # B9: 3,7 # A3: 1,2 => SOL
* STA B7: 1,2 # B9: 3,7 + A3: 1,2
* CNT   9 HDP CHAINS /  32 HYP OPENED

Header Info

36038;12_05;GP;24;11.30;1.20;1.20

Solution

position: 984753612753216489216984537842137956167549823395628174429871365538462791671395248 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 # B7: 3,7 => UNS
* INC # B9: 3,7 => UNS
* INC # G8: 3,7 => UNS
* INC # G8: 4,5,8,9 => UNS
* CNT   4 HDP CHAINS /   4 HYP OPENED

A2. Pair Reduction

Full list of HDP chains traversed:

* INC # B7: 3,7 => UNS
* INC # B9: 3,7 => UNS
* INC # G8: 3,7 => UNS
* INC # G8: 4,5,8,9 => UNS
* CNT   4 HDP CHAINS /   4 HYP OPENED

A3. Deep Pair Reduction

Full list of HDP chains traversed:

* INC # B7: 3,7 => UNS
* INC # B9: 3,7 => UNS
* INC # G8: 3,7 => UNS
* INC # G8: 4,5,8,9 => UNS
* DIS # B7: 3,7 # C1: 1,4 => CTR => C1: 2,3
* INC # B7: 3,7 + C1: 2,3 # C2: 1,4 => UNS
* INC # B7: 3,7 + C1: 2,3 # C2: 1,4 => UNS
* DIS # B7: 3,7 + C1: 2,3 # C2: 2,3 => CTR => C2: 1,4
* INC # B7: 3,7 + C1: 2,3 + C2: 1,4 # D3: 1,4 => UNS
* DIS # B7: 3,7 + C1: 2,3 + C2: 1,4 # F3: 1,4 => CTR => F3: 3,5,9
* DIS # B7: 3,7 + C1: 2,3 + C2: 1,4 + F3: 3,5,9 # G3: 1,4 => CTR => G3: 5,7,9
* DIS # B7: 3,7 + C1: 2,3 + C2: 1,4 + F3: 3,5,9 + G3: 5,7,9 # H3: 1,4 => CTR => H3: 5,9
* INC # B7: 3,7 + C1: 2,3 + C2: 1,4 + F3: 3,5,9 + G3: 5,7,9 + H3: 5,9 # D3: 1,4 => UNS
* DIS # B7: 3,7 + C1: 2,3 + C2: 1,4 + F3: 3,5,9 + G3: 5,7,9 + H3: 5,9 # D3: 3,9 => CTR => D3: 1,4
* INC # B7: 3,7 + C1: 2,3 + C2: 1,4 + F3: 3,5,9 + G3: 5,7,9 + H3: 5,9 + D3: 1,4 # A9: 1,4 => UNS
* INC # B7: 3,7 + C1: 2,3 + C2: 1,4 + F3: 3,5,9 + G3: 5,7,9 + H3: 5,9 + D3: 1,4 # A9: 5,6 => UNS
* INC # B7: 3,7 + C1: 2,3 + C2: 1,4 + F3: 3,5,9 + G3: 5,7,9 + H3: 5,9 + D3: 1,4 # A9: 1,4 => UNS
* INC # B7: 3,7 + C1: 2,3 + C2: 1,4 + F3: 3,5,9 + G3: 5,7,9 + H3: 5,9 + D3: 1,4 # A9: 5,6 => UNS
* DIS # B7: 3,7 + C1: 2,3 + C2: 1,4 + F3: 3,5,9 + G3: 5,7,9 + H3: 5,9 + D3: 1,4 # C9: 4,8 => CTR => C9: 1
* DIS # B7: 3,7 + C1: 2,3 + C2: 1,4 + F3: 3,5,9 + G3: 5,7,9 + H3: 5,9 + D3: 1,4 + C9: 1 => CTR => B7: 1,2
* INC B7: 1,2 # A7: 1,2 => UNS
* INC B7: 1,2 # A7: 3,4,5 => UNS
* INC B7: 1,2 # B3: 1,2 => UNS
* INC B7: 1,2 # B6: 1,2 => UNS
* INC B7: 1,2 # B9: 3,7 => UNS
* INC B7: 1,2 # B9: 1,6 => UNS
* INC B7: 1,2 # G8: 3,7 => UNS
* INC B7: 1,2 # G8: 4,5,8,9 => UNS
* INC B7: 1,2 # B9: 3,7 # C1: 1,2 => UNS
* INC B7: 1,2 # B9: 3,7 # C2: 1,2 => UNS
* PRF B7: 1,2 # B9: 3,7 # A3: 1,2 => SOL
* STA B7: 1,2 # B9: 3,7 + A3: 1,2
* CNT  31 HDP CHAINS /  32 HYP OPENED