Strategies for Number Puzzles of all kinds
Caution!
Print Version
Solvers
Puzzles
Latest Apps
Str8ts
Other


Valid XHTML 4.01 Transitional


Discussion...


Post an idea here...
Your Name or Handle

Your comment, idea or question

Please enter the
letters you see:
arrow
Enter these letters
Remember me


Please keep your comments relevant to this puzzle.
Email addresses are never displayed, but they are required to confirm your comments. To state your solve time use the smaller form at the top right of this page." & vbNewLine & _ Line breaks and paragraphs are automatically converted ? no need to use <p> or <br> tags.

Sunday 16-Jun-2019

... by: Frans Goosens

With trial and error

Combination C3=148 and F9=359

************************************************************
C3=1 F9=3 Wrong, Undo calculation

All reset to initial position

************************************************************
C3=1 F9=5 Wrong, Undo calculation

All reset to initial position

************************************************************
C3=1 F9=9 Wrong, Undo calculation

All reset to initial position

************************************************************
C3=4 F9=3 Wrong, Undo calculation

All reset to initial position

************************************************************
C3=4 F9=5 Wrong, Undo calculation

All reset to initial position

************************************************************
C3=4 F9=9 No solution, Fixed

Combination 2-digits cells

B1=3 No solution, Undo calculation
B1=5 Wrong, Undo calculation
B1=3 No solution, Fixed
A2=2 Wrong, Undo calculation
A2=5 Wrong, Undo calculation

All reset to initial position

************************************************************
C3=8 F9=3 Wrong, Undo calculation

All reset to initial position

************************************************************
C3=8 F9=5 Wrong, Undo calculation

All reset to initial position

************************************************************
C3=8 F9=9 No solution, Fixed

Combination 2-digits cells

C8=2 ( I6=5 ) Solved,


#352--------------------------Solution
000 000 001-------------624 953 781
000 001 006-------------537 281 946
090 670 300-------------198 674 325

005 000 062-------------485 397 162
009 000 400-------------219 568 473
700 040 800-------------763 142 859

002 006 000-------------342 816 597
800 730 000-------------856 739 214
970 400 000-------------971 425 638

Total solving time is : 210 sec.
Number of logical steps is : 20725

Sunday 16-Jun-2019

... by: James Havard

1 minute and 15 seconds and 37 subs to a solution. C1=1 and A6=3 solves in basic.

Saturday 15-Jun-2019

... by: SuDokuFan

Found, from the start, 2 exocets that reduce the puzzle to lclste.
First, 2 singles + locked candidates.
Then exocet found: 1346 r89c3 r6c2 r3c1.
(1 in cells, removed from target, contradiction by basics, 6 in cells false in targets, contradiction by basics, 4 in cells false in targets, no solution (contradiction by no solution), 3 in cells false in targets, contradiction by no solution)
Non base digits in target cell -2 r6c2 -25 r3c1
Locked 8 in c2r45 other non base digits not true in mirror node -2r5c2.
Use single.
Second exocet: 1357r5c89 r4c6 r6c3.
(1 in cells false in targets, contradiction by no solution, 3 in cells false in targets, contradiction by forcing chains, 5 in base, contradiction by no solution, 7 in base false in targets, contradiction by basics)
Non base digits in target -89r4c6 -6r6c3.
Base digits proven false: -5r5c89
Use single.
Base digits proven false: -3r9c3
Pointing pairs eliminate some 3's.
Now use compatible digit check. From cell C1 it is clear that one, but not both, of (1,4) is a true base digit. If 4 is a true base digit and is thus true in C1, there is a contradiction (by basics), so 4 is not a true base digit.
Use basics, single placed in F3 shows 1 is not a true base digit in E8.
Basics to the end.

Saturday 15-Jun-2019

... by: Algo

Chains should be:

> AIC Rule 3 intersection of A2,F4 | Cand=2 ~ Chain:-2[A2]+3[A2]-3[B2]+3[B4]-3[D4]+3[D1]-3[F3]+3[I3]-3[I8]+1[I8]-1[H8]
+9[H8]-9[H6]+2[H6]-2[F6]+2[F4]-3[A4]+3[A2]

> AIC Rule 3 intersection of E2,F4 | Cand=1 ~ Chain:-1[E2]+8[E2]-8[E6]+8[I6]-8[I9]+3[I9]-3[I8]+1[I8]-1[H8]+1[H3]-1[F3]
+1[F4]-8[E4]+3[E2]

> AIC Rule 3 intersection of A6,D5 | Cand=9 ~ Chain:-9[A6]+9[H6]-9[H8]+1[H8]-1[I8]+3[I8]-3[I3]+3[F3]-3[D1]+4[D1]-4[D2]
+8[D2]-8[D5]+9[D5]-9[A5]+3[A6]

> AIC Rule 3 intersection of H6,A2 | Cand=2 ~ Chain:-2[H6]+9[H6]-9[H8]+1[H8]-1[I8]+3[I8]-3[I3]+3[F3]-3[D1]+3[D4]-3[B4]
+3[B2]-3[A2]+2[A2]-9[A6]+3[H6]

Saturday 15-Jun-2019

... by: Algo

Single cell guess: A3 = 4.
48 trials in 55s.

24> Hidden single in c5 | Cand=6
25> Hidden single in c1 | Cand=6
> Pointing pairs in blkB1 c2 | Cand=8

26> Guess1x in A3 = 4

27> Hidden single in rB | Cand=4
28> Hidden single in rC | Cand=4
29> Hidden single in c3 | Cand=7
30> Hidden single in c3 | Cand=8
31> Naked single in rC | Cand=5
32> Naked single in rC | Cand=2
33> Naked single in rB | Cand=9
34> Naked single in rC | Cand=1
35> Naked single in rA | Cand=7
36> Naked single in rA | Cand=8
37> Naked single in rD | Cand=1
38> Naked single in rG | Cand=5
39> Hidden single in rD | Cand=7
40> Hidden single in c1 | Cand=5
41> Hidden single in c1 | Cand=2
42> Hidden single in c2 | Cand=5
43> Hidden single in rH | Cand=4
44> Hidden single in c2 | Cand=6
> Naked pairs in c2 rA,B | Cand=[2, 3]
> Pointing pairs in blkB2 c4 | Cand=1
> Pointing pairs in blkB3 rF | Cand=9
45> AIC Rule 2 in G1 | Cand=3 ~ Chain:-3[G1]+4[G1]-4[G2]+1[G2]-1[H3]+1[H8]-1[I8]+3[I8]-3[I3]+3[F3]-3[D1]+3[G1]
> AIC Rule 3 intersection of A2,F4 | Cand=2 ~ Chain:-2[A2]+3[A2]-3[B2]+3[B4]-3[D4]+3[D1]-3[F3]+3[I3]-3[I8]+1[I8]-1[H8]+9[H8]-9[H6]+2[H6]-2[F6]+2[F4]-3[A4]+3[A2]
> AIC Rule 3 intersection of E2,F4 | Cand=1 ~ Chain:-1[E2]+8[E2]-8[E6]+8[I6]-8[I9]+3[I9]-3[I8]+1[I8]-1[H8]+1[H3]-1[F3]+1[F4]-8[E4]+3[E2]
> AIC Rule 3 intersection of A6,D5 | Cand=9 ~ Chain:-9[A6]+9[H6]-9[H8]+1[H8]-1[I8]+3[I8]-3[I3]+3[F3]-3[D1]+4[D1]-4[D2]+8[D2]-8[D5]+9[D5]-9[A5]+3[A6]
> AIC Rule 3 intersection of H6,A2 | Cand=2 ~ Chain:-2[H6]+9[H6]-9[H8]+1[H8]-1[I8]+3[I8]-3[I3]+3[F3]-3[D1]+3[D4]-3[B4]+3[B2]-3[A2]+2[A2]-9[A6]+3[H6]

Archive

Each week a new 'unsolvable' will be published and the previous will be accessible here from this archive section. If you like very tough puzzles, these are for you.
Share and Enjoy




Page created on 03-May-2011, last modified on 03-May-2011.
All puzzles on this site are trademarked and copyright
and cannot be reproduced without permission.
Copyright Syndicated Puzzles Inc, 2011-2015