Analysis of xx-ph-00001666-426-base.sdk

Contents

Original Sudoku

level: hard

Original Sudoku

position: ..34...89.5...92...........27.............5....8.1...4..1.4..6....86...3.....79.. initial

Autosolve

position: ..34...89.5...92...........27.............5....8.1...4..194..6....86...3.....79.. 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: 0:00:44.145969

The following important HDP chains were detected:

* DIS # I7: 7,8 # A9: 3,5 => CTR => A9: 4,6,8
* DIS # I7: 7,8 + A9: 4,6,8 # B9: 2,3 => CTR => B9: 4,6,8
* DIS # I7: 7,8 + A9: 4,6,8 + B9: 4,6,8 # H8: 1,4 => CTR => H8: 2,5
* DIS # I7: 7,8 + A9: 4,6,8 + B9: 4,6,8 + H8: 2,5 # F8: 2,5 => CTR => F8: 1
* PRF # I7: 7,8 + A9: 4,6,8 + B9: 4,6,8 + H8: 2,5 + F8: 1 # F6: 2,5 => SOL
* STA # I7: 7,8 + A9: 4,6,8 + B9: 4,6,8 + H8: 2,5 + F8: 1 + F6: 2,5
* CNT   5 HDP CHAINS /  26 HYP OPENED

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

Details

Positions

..34...89.5...92...........27.............5....8.1...4..1.4..6....86...3.....79.. initial
..34...89.5...92...........27.............5....8.1...4..194..6....86...3.....79.. autosolve
123456789457189236689723145275394618314678592968215374531942867792861453846537921 solved

Classification

level: hard

Pairing Analysis

--------------------------------------------------
* PAIRS (1)
G7: 7,8

--------------------------------------------------
* CONSTRAINT PAIRS (AUTO SOLVE)
A5,B5: 1.. / A5 = 1  =>  2 pairs (_) / B5 = 1  =>  2 pairs (_)
F8,D9: 1.. / F8 = 1  =>  2 pairs (_) / D9 = 1  =>  2 pairs (_)
F4,F5: 4.. / F4 = 4  =>  1 pairs (_) / F5 = 4  =>  3 pairs (_)
C4,F4: 4.. / C4 = 4  =>  3 pairs (_) / F4 = 4  =>  1 pairs (_)
G3,G8: 4.. / G3 = 4  =>  3 pairs (_) / G8 = 4  =>  2 pairs (_)
E1,F1: 5.. / E1 = 5  =>  2 pairs (_) / F1 = 5  =>  4 pairs (_)
H3,I3: 5.. / H3 = 5  =>  3 pairs (_) / I3 = 5  =>  1 pairs (_)
C4,A6: 5.. / C4 = 5  =>  2 pairs (_) / A6 = 5  =>  1 pairs (_)
A2,E2: 8.. / A2 = 8  =>  2 pairs (_) / E2 = 8  =>  3 pairs (_)
G4,G7: 8.. / G4 = 8  =>  4 pairs (_) / G7 = 8  =>  1 pairs (_)
E4,E5: 9.. / E4 = 9  =>  2 pairs (_) / E5 = 9  =>  2 pairs (_)
* DURATION: 0:00:10.787559  START: 10:09:25.000483  END: 10:09:35.788042 2020-11-30
* CP COUNT: (11)
* INCONCLUSIVE

* DEEP PAIR REDUCTION
* DURATION: 0:00:43.947467  START: 10:09:40.898257  END: 10:10:24.845724 2020-11-30
* SOLUTION FOUND
* SAVE PR GRAPH xx-ph-00001666-426-base-pr-002.dot
* REASONING
* DIS # I7: 7,8 # A9: 3,5 => CTR => A9: 4,6,8
* DIS # I7: 7,8 + A9: 4,6,8 # B9: 2,3 => CTR => B9: 4,6,8
* DIS # I7: 7,8 + A9: 4,6,8 + B9: 4,6,8 # H8: 1,4 => CTR => H8: 2,5
* DIS # I7: 7,8 + A9: 4,6,8 + B9: 4,6,8 + H8: 2,5 # F8: 2,5 => CTR => F8: 1
* PRF # I7: 7,8 + A9: 4,6,8 + B9: 4,6,8 + H8: 2,5 + F8: 1 # F6: 2,5 => SOL
* STA # I7: 7,8 + A9: 4,6,8 + B9: 4,6,8 + H8: 2,5 + F8: 1 + F6: 2,5
* CNT   5 HDP CHAINS /  26 HYP OPENED

Header Info

1666;426;elev;21;11.30;1.20;1.20

Solution

position: 123456789457189236689723145275394618314678592968215374531942867792861453846537921 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 # I7: 7,8 => UNS
* INC # I7: 2,5 => UNS
* INC # A7: 7,8 => UNS
* INC # A7: 3,5 => UNS
* CNT   4 HDP CHAINS /   4 HYP OPENED

A2. Pair Reduction

Full list of HDP chains traversed:

* INC # I7: 7,8 => UNS
* INC # I7: 2,5 => UNS
* INC # A7: 7,8 => UNS
* INC # A7: 3,5 => UNS
* CNT   4 HDP CHAINS /   4 HYP OPENED

A3. Deep Pair Reduction

Full list of HDP chains traversed:

* INC # I7: 7,8 => UNS
* INC # I7: 2,5 => UNS
* INC # A7: 7,8 => UNS
* INC # A7: 3,5 => UNS
* DIS # I7: 7,8 # A9: 3,5 => CTR => A9: 4,6,8
* INC # I7: 7,8 + A9: 4,6,8 # F7: 3,5 => UNS
* INC # I7: 7,8 + A9: 4,6,8 # F7: 2 => UNS
* INC # I7: 7,8 + A9: 4,6,8 # A6: 3,5 => UNS
* INC # I7: 7,8 + A9: 4,6,8 # A6: 6,9 => UNS
* DIS # I7: 7,8 + A9: 4,6,8 # B9: 2,3 => CTR => B9: 4,6,8
* INC # I7: 7,8 + A9: 4,6,8 + B9: 4,6,8 # I5: 7,8 => UNS
* INC # I7: 7,8 + A9: 4,6,8 + B9: 4,6,8 # I5: 2,6 => UNS
* DIS # I7: 7,8 + A9: 4,6,8 + B9: 4,6,8 # H8: 1,4 => CTR => H8: 2,5
* INC # I7: 7,8 + A9: 4,6,8 + B9: 4,6,8 + H8: 2,5 # H9: 1,4 => UNS
* INC # I7: 7,8 + A9: 4,6,8 + B9: 4,6,8 + H8: 2,5 # H9: 1,4 => UNS
* INC # I7: 7,8 + A9: 4,6,8 + B9: 4,6,8 + H8: 2,5 # H9: 2,5 => UNS
* INC # I7: 7,8 + A9: 4,6,8 + B9: 4,6,8 + H8: 2,5 # G3: 1,4 => UNS
* INC # I7: 7,8 + A9: 4,6,8 + B9: 4,6,8 + H8: 2,5 # G3: 3,6,7 => UNS
* INC # I7: 7,8 + A9: 4,6,8 + B9: 4,6,8 + H8: 2,5 # A6: 3,5 => UNS
* INC # I7: 7,8 + A9: 4,6,8 + B9: 4,6,8 + H8: 2,5 # A6: 6,9 => UNS
* DIS # I7: 7,8 + A9: 4,6,8 + B9: 4,6,8 + H8: 2,5 # F8: 2,5 => CTR => F8: 1
* INC # I7: 7,8 + A9: 4,6,8 + B9: 4,6,8 + H8: 2,5 + F8: 1 # D9: 2,5 => UNS
* INC # I7: 7,8 + A9: 4,6,8 + B9: 4,6,8 + H8: 2,5 + F8: 1 # E9: 2,5 => UNS
* INC # I7: 7,8 + A9: 4,6,8 + B9: 4,6,8 + H8: 2,5 + F8: 1 # F1: 2,5 => UNS
* PRF # I7: 7,8 + A9: 4,6,8 + B9: 4,6,8 + H8: 2,5 + F8: 1 # F6: 2,5 => SOL
* STA # I7: 7,8 + A9: 4,6,8 + B9: 4,6,8 + H8: 2,5 + F8: 1 + F6: 2,5
* CNT  25 HDP CHAINS /  26 HYP OPENED