Analysis of xx-top500-066-base.sdk

Contents

Original Sudoku

level: medium

Original Sudoku

position: 1.....3...3...4......2....8....1.64..2.7.....5.8......6...3............1.......2. initial

Autosolve

position: 184.6.3.223.184.6..6.2.3418..38126454267..1835183462..6.2.318.484.62..313.14.8.26 autosolve
Autosolve

Pair Reduction Variants

Pair Reduction Analysis

Pair Reduction Analysis

The following important HDP chains were detected:

* DIS # C2: 7,9 => CTR => C2: 5
* PRF # C2: 5 => SOL
* PRF # C3: 7,9 => SOL
* DIS # C3: 5 => CTR => C3: 7,9
* DIS # E3: 7,9 => CTR => E3: 5
* PRF # E3: 5 => SOL
* DIS # F1: 5,9 => CTR => F1: 7
* DIS # H1: 7 => CTR => H1: 5,9
* DIS # H1: 7,9 => CTR => H1: 5
* PRF # H1: 5 => SOL
* PRF # G2: 7,9 => SOL
* DIS # G2: 5 => CTR => G2: 7,9
* DIS # C2: 7,9 => CTR => C2: 5
* PRF # C2: 5 => SOL
* DIS # B9: 7,9 => CTR => B9: 5
* DIS # E9: 5,9 => CTR => E9: 7
* DIS # F1: 5,9 => CTR => F1: 7
* DIS # H1: 7,9 => CTR => H1: 5
* PRF # H1: 5 => SOL
* PRF # H7: 7,9 => SOL
* DIS # H7: 5 => CTR => H7: 7,9
* DIS # B9: 7,9 => CTR => B9: 5
* PRF # F8: 7,9 => SOL
* DIS # F8: 5 => CTR => F8: 7,9
* DIS # G8: 7,9 => CTR => G8: 5
* PRF # G8: 5 => SOL
* DIS # C2: 7,9 => CTR => C2: 5
* PRF # C2: 5 => SOL
* PRF # C3: 7,9 => SOL
* DIS # C3: 5 => CTR => C3: 7,9
* DIS # E9: 5,9 => CTR => E9: 7
* PRF # B7: 5,9 => SOL
* CNT  32 HDP CHAINS /  47 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 # C2: 7,9 => CTR => C2: 5
* PRF C2: 5 => SOL
* STA C2: 5
* CNT   2 HDP CHAINS /   1 HYP OPENED

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

Details

Positions

1.....3...3...4......2....8....1.64..2.7.....5.8......6...3............1.......2. initial
184.6.3.223.184.6..6.2.3418..38126454267..1835183462..6.2.318.484.62..313.14.8.26 autosolve
184967352235184769769253418973812645426795183518346297692531874847629531351478926 solved

Classification

level: medium

Pairing Analysis

--------------------------------------------------
* PAIRS (11)
A3: 7,9
D1: 5,9
I2: 7,9
A4: 7,9
B4: 7,9
E5: 5,9
F5: 5,9
H6: 7,9
I6: 7,9
C8: 7,9
D7: 5,9

--------------------------------------------------
* CONSTRAINT PAIRS (AUTO SOLVE)
C2,C3: 5.. / C2 = 5  =>  0 pairs (*) / C3 = 5  =>  0 pairs (X)
H1,G2: 5.. / H1 = 5  =>  0 pairs (*) / G2 = 5  =>  0 pairs (X)
E5,F5: 5.. / E5 = 5  =>  0 pairs (X) / F5 = 5  =>  0 pairs (_)
B7,B9: 5.. / B7 = 5  =>  0 pairs (X) / B9 = 5  => 14 pairs (_)
C2,G2: 5.. / C2 = 5  =>  0 pairs (*) / G2 = 5  =>  0 pairs (X)
C3,E3: 5.. / C3 = 5  =>  0 pairs (X) / E3 = 5  =>  0 pairs (_)
F8,G8: 5.. / F8 = 5  =>  0 pairs (X) / G8 = 5  =>  0 pairs (_)
D1,D7: 5.. / D1 = 5  =>  0 pairs (X) / D7 = 5  =>  0 pairs (_)
H1,H7: 5.. / H1 = 5  =>  0 pairs (*) / H7 = 5  =>  0 pairs (X)
F1,E3: 7.. / F1 = 7  => 17 pairs (_) / E3 = 7  =>  0 pairs (X)
A4,B4: 7.. / A4 = 7  => 15 pairs (_) / B4 = 7  =>  0 pairs (*)
H6,I6: 7.. / H6 = 7  =>  0 pairs (X) / I6 = 7  => 13 pairs (_)
F8,E9: 7.. / F8 = 7  =>  0 pairs (X) / E9 = 7  => 17 pairs (_)
F1,H1: 7.. / F1 = 7  => 17 pairs (_) / H1 = 7  =>  0 pairs (X)
B7,H7: 7.. / B7 = 7  => 17 pairs (_) / H7 = 7  =>  0 pairs (*)
A3,A4: 7.. / A3 = 7  =>  0 pairs (*) / A4 = 7  =>  0 pairs (X)
E3,E9: 7.. / E3 = 7  =>  0 pairs (X) / E9 = 7  => 17 pairs (_)
F1,F8: 7.. / F1 = 7  => 17 pairs (_) / F8 = 7  =>  0 pairs (X)
I2,I6: 7.. / I2 = 7  =>  0 pairs (X) / I6 = 7  => 13 pairs (_)
A4,B4: 9.. / A4 = 9  =>  0 pairs (*) / B4 = 9  =>  0 pairs (X)
E5,F5: 9.. / E5 = 9  =>  0 pairs (*) / F5 = 9  =>  0 pairs (X)
H6,I6: 9.. / H6 = 9  => 13 pairs (_) / I6 = 9  =>  0 pairs (X)
A3,A4: 9.. / A3 = 9  => 15 pairs (_) / A4 = 9  =>  0 pairs (*)
D1,D7: 9.. / D1 = 9  =>  0 pairs (*) / D7 = 9  =>  0 pairs (X)
I2,I6: 9.. / I2 = 9  => 13 pairs (_) / I6 = 9  =>  0 pairs (X)
* DURATION: 0:00:55.623518  START: 04:54:29.852667  END: 04:55:25.476185 2017-05-04
* CP COUNT: (25)
* SOLUTION FOUND

--------------------------------------------------
* PREPARE PR GRAPH
* PAIR REDUCTION ..
* LEVEL 0 PASS 1 ROUND 1 (AUTO SOLVE) (A3,A4,B4,C8,D1,D7,E5,F5,H6,I2,I6)
* 184.6.3.223.184.6..6.2.3418..38126454267..1835183462..6.2.318.484.62..313.14.8.26
* PAIR A3: 7,9 BLK 1
C2: 7,9,5                                # reduction candidate for 7,9
C2: 7,9 => CTR
* 1845673922391845677652934189738126454267..1835183462..6.2.3185484.625.31351478926
C2: 5 => SOLVED
* 184967352235184769769253418973812645426795183518346297692531874847629531351478926
C3: 7,9,5                                # reduction candidate for 7,9
C3: 7,9 => SOLVED
* 184967352235184769769253418973812645426795183518346297692531874847629531351478926
C3: 5 => CTR
* 1845673922391845677652934189738126454267..1835183462..6.2.3185484.625.31351478926
* PAIR A3: 7,9 ROW 3
E3: 7,9,5                                # reduction candidate for 7,9
E3: 7,9 => CTR
* 1845673922391845677652934189738126454267..1835183462..6.2.3185484.625.31351478926
E3: 5 => SOLVED
* 184967352235184769769253418973812645426795183518346297692531874847629531351478926
* PAIR D1: 5,9 BLK 2
F1: 5,9,7                                # reduction candidate for 5,9
F1: 5,9 => CTR
* 184.6.3722371845699652734187938126454267..1835183462976729318.484.62..313.14.8.26
F1: 7                                    # 17 pairs
E3: 5,9,7                                # reduction candidate for 5,9
E3: 5,9                                  # 17 pairs
* PAIR D1: 5,9 ROW 1
H1: 5,9,7                                # reduction candidate for 5,9
H1: 7 => CTR
* 184.6.3722371845699652734187938126454267..1835183462976729318.484.62..313.14.8.26
H1: 5,9                                  # 17 pairs
* PAIR I2: 7,9 BLK 3
H1: 7,9,5                                # reduction candidate for 7,9
H1: 7,9 => CTR
* 1845673922391845677652934189738126454267..1835183462..6.2.3185484.625.31351478926
H1: 5 => SOLVED
* 184967352235184769769253418973812645426795183518346297692531874847629531351478926
G2: 7,9,5                                # reduction candidate for 7,9
G2: 7,9 => SOLVED
* 184967352235184769769253418973812645426795183518346297692531874847629531351478926
G2: 5 => CTR
* 1845673922391845677652934189738126454267..1835183462..6.2.3185484.625.31351478926
* PAIR I2: 7,9 ROW 2
C2: 7,9,5                                # reduction candidate for 7,9
C2: 7,9 => CTR
* 1845673922391845677652934189738126454267..1835183462..6.2.3185484.625.31351478926
C2: 5 => SOLVED
* 184967352235184769769253418973812645426795183518346297692531874847629531351478926
* PAIR B4: 7,9 COL B
B7: 7,9,5                                # reduction candidate for 7,9
B7: 7,9                                  # 14 pairs
B9: 7,9,5                                # reduction candidate for 7,9
B9: 7,9 => CTR
* 18456739223.184.6..6.2.3418..38126454267..1835183462..65293187484.62..313.14.8.26
B9: 5                                    # 14 pairs
* PAIR E5: 5,9 COL E
E3: 5,9,7                                # reduction candidate for 5,9
E3: 5,9                                  # 17 pairs
E9: 5,9,7                                # reduction candidate for 5,9
E9: 5,9 => CTR
* 184.6.3.223.184.6..6.2734187938126454267..1835183462..6.2.318.48496275313.14.8.26
E9: 7                                    # 17 pairs
* PAIR F5: 5,9 COL F
F1: 5,9,7                                # reduction candidate for 5,9
F1: 5,9 => CTR
* 184.6.3722371845699652734187938126454267..1835183462976729318.484.62..313.14.8.26
F1: 7                                    # 17 pairs
F8: 5,9,7                                # reduction candidate for 5,9
F8: 5,9                                  # 17 pairs
* PAIR H6: 7,9 COL H
H1: 7,9,5                                # reduction candidate for 7,9
H1: 7,9 => CTR
* 1845673922391845677652934189738126454267..1835183462..6.2.3185484.625.31351478926
H1: 5 => SOLVED
* 184967352235184769769253418973812645426795183518346297692531874847629531351478926
H7: 7,9,5                                # reduction candidate for 7,9
H7: 7,9 => SOLVED
* 184967352235184769769253418973812645426795183518346297692531874847629531351478926
H7: 5 => CTR
* 18456739223.184.6..6.2.3418..38126454267..1835183462..672931854849625731351478926
* PAIR C8: 7,9 BLK 7
B7: 7,9,5                                # reduction candidate for 7,9
B7: 7,9                                  # 14 pairs
B9: 7,9,5                                # reduction candidate for 7,9
B9: 7,9 => CTR
* 18456739223.184.6..6.2.3418..38126454267..1835183462..65293187484.62..313.14.8.26
B9: 5                                    # 14 pairs
* PAIR C8: 7,9 ROW 8
F8: 7,9,5                                # reduction candidate for 7,9
F8: 7,9 => SOLVED
* 184967352235184769769253418973812645426795183518346297692531874847629531351478926
F8: 5 => CTR
* 18456739223918456776529341897381264542675918351834627.6.2.318.484.625.313.1478.26
G8: 7,9,5                                # reduction candidate for 7,9
G8: 7,9 => CTR
* 18456739223918456776529341897381264542675918351834627.6.2.318.484.625.313.1478.26
G8: 5 => SOLVED
* 184967352235184769769253418973812645426795183518346297692531874847629531351478926
* PAIR C8: 7,9 COL C
C2: 7,9,5                                # reduction candidate for 7,9
C2: 7,9 => CTR
* 1845673922391845677652934189738126454267..1835183462..6.2.3185484.625.31351478926
C2: 5 => SOLVED
* 184967352235184769769253418973812645426795183518346297692531874847629531351478926
C3: 7,9,5                                # reduction candidate for 7,9
C3: 7,9 => SOLVED
* 184967352235184769769253418973812645426795183518346297692531874847629531351478926
C3: 5 => CTR
* 1845673922391845677652934189738126454267..1835183462..6.2.3185484.625.31351478926
* PAIR D7: 5,9 BLK 8
F8: 5,9,7                                # reduction candidate for 5,9
F8: 5,9                                  # 17 pairs
E9: 5,9,7                                # reduction candidate for 5,9
E9: 5,9 => CTR
* 184.6.3.223.184.6..6.2734187938126454267..1835183462..6.2.318.48496275313.14.8.26
E9: 7                                    # 17 pairs
* PAIR D7: 5,9 ROW 7
B7: 5,9,7                                # reduction candidate for 5,9
B7: 5,9 => SOLVED
* 184967352235184769769253418973812645426795183518346297692531874847629531351478926
B7: 7                                    # 17 pairs
H7: 5,9,7                                # reduction candidate for 5,9
H7: 5,9                                  # 17 pairs
* INCONCLUSIVE
* SAVE PR GRAPH xx-top500-066-base-pr-000.dot
* REASONING
* DIS # C2: 7,9 => CTR => C2: 5
* PRF # C2: 5 => SOL
* PRF # C3: 7,9 => SOL
* DIS # C3: 5 => CTR => C3: 7,9
* DIS # E3: 7,9 => CTR => E3: 5
* PRF # E3: 5 => SOL
* DIS # F1: 5,9 => CTR => F1: 7
* DIS # H1: 7 => CTR => H1: 5,9
* DIS # H1: 7,9 => CTR => H1: 5
* PRF # H1: 5 => SOL
* PRF # G2: 7,9 => SOL
* DIS # G2: 5 => CTR => G2: 7,9
* DIS # C2: 7,9 => CTR => C2: 5
* PRF # C2: 5 => SOL
* DIS # B9: 7,9 => CTR => B9: 5
* DIS # E9: 5,9 => CTR => E9: 7
* DIS # F1: 5,9 => CTR => F1: 7
* DIS # H1: 7,9 => CTR => H1: 5
* PRF # H1: 5 => SOL
* PRF # H7: 7,9 => SOL
* DIS # H7: 5 => CTR => H7: 7,9
* DIS # B9: 7,9 => CTR => B9: 5
* PRF # F8: 7,9 => SOL
* DIS # F8: 5 => CTR => F8: 7,9
* DIS # G8: 7,9 => CTR => G8: 5
* PRF # G8: 5 => SOL
* DIS # C2: 7,9 => CTR => C2: 5
* PRF # C2: 5 => SOL
* PRF # C3: 7,9 => SOL
* DIS # C3: 5 => CTR => C3: 7,9
* DIS # E9: 5,9 => CTR => E9: 7
* PRF # B7: 5,9 => SOL
* CNT  32 HDP CHAINS /  47 HYP OPENED

--------------------------------------------------
* PREPARE PR GRAPH
* PAIR REDUCTION ..
* LEVEL 0 PASS 1 ROUND 1 (AUTO SOLVE) (A3,A4,B4,C8,D1,D7,E5,F5,H6,I2,I6)
* 184.6.3.223.184.6..6.2.3418..38126454267..1835183462..6.2.318.484.62..313.14.8.26
* PAIR A3: 7,9 BLK 1
C2: 7,9,5                                # reduction candidate for 7,9
C2: 7,9 => CTR
* 1845673922391845677652934189738126454267..1835183462..6.2.3185484.625.31351478926
C2: 5 => SOLVED
* 184967352235184769769253418973812645426795183518346297692531874847629531351478926
* DURATION: 0:00:02.080023  START: 04:56:29.782353  END: 04:56:31.862376 2017-05-04
* SOLUTION FOUND
* SAVE PR GRAPH xx-top500-066-base-pr-001.dot
* REASONING
* DIS # C2: 7,9 => CTR => C2: 5
* PRF C2: 5 => SOL
* STA C2: 5
* CNT   2 HDP CHAINS /   1 HYP OPENED

Header Info

Top 500 Minimum 17 066

solution: 184967352235184769769253418973812645426795183518346297692531874847629531351478926
info: 1443     FNBHWXY  S8.f     39943

http://www.sfsudoku.com/su17ExtremeDiff500.txt from http://www.minimumsudoku.com/

Solution

position: 184967352235184769769253418973812645426795183518346297692531874847629531351478926 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 # C2: 7,9 => CTR => C2: 5
* PRF # C2: 5 => SOL
* PRF # C3: 7,9 => SOL
* DIS # C3: 5 => CTR => C3: 7,9
* DIS # E3: 7,9 => CTR => E3: 5
* PRF # E3: 5 => SOL
* DIS # F1: 5,9 => CTR => F1: 7
* INC # F1: 7 => UNS
* INC # E3: 5,9 => UNS
* INC # H1: 5,9 => UNS
* DIS # H1: 7 => CTR => H1: 5,9
* DIS # H1: 7,9 => CTR => H1: 5
* PRF # H1: 5 => SOL
* PRF # G2: 7,9 => SOL
* DIS # G2: 5 => CTR => G2: 7,9
* DIS # C2: 7,9 => CTR => C2: 5
* PRF # C2: 5 => SOL
* INC # B7: 7,9 => UNS
* DIS # B9: 7,9 => CTR => B9: 5
* INC # B9: 5 => UNS
* INC # E3: 5,9 => UNS
* DIS # E9: 5,9 => CTR => E9: 7
* INC # E9: 7 => UNS
* DIS # F1: 5,9 => CTR => F1: 7
* INC # F1: 7 => UNS
* INC # F8: 5,9 => UNS
* DIS # H1: 7,9 => CTR => H1: 5
* PRF # H1: 5 => SOL
* PRF # H7: 7,9 => SOL
* DIS # H7: 5 => CTR => H7: 7,9
* INC # B7: 7,9 => UNS
* DIS # B9: 7,9 => CTR => B9: 5
* INC # B9: 5 => UNS
* PRF # F8: 7,9 => SOL
* DIS # F8: 5 => CTR => F8: 7,9
* DIS # G8: 7,9 => CTR => G8: 5
* PRF # G8: 5 => SOL
* DIS # C2: 7,9 => CTR => C2: 5
* PRF # C2: 5 => SOL
* PRF # C3: 7,9 => SOL
* DIS # C3: 5 => CTR => C3: 7,9
* INC # F8: 5,9 => UNS
* DIS # E9: 5,9 => CTR => E9: 7
* INC # E9: 7 => UNS
* PRF # B7: 5,9 => SOL
* INC # B7: 7 => UNS
* INC # H7: 5,9 => UNS
* CNT  47 HDP CHAINS /  47 HYP OPENED

A2. Pair Reduction

Full list of HDP chains traversed:

* DIS # C2: 7,9 => CTR => C2: 5
* PRF C2: 5 => SOL
* STA C2: 5
* CNT   2 HDP CHAINS /   1 HYP OPENED