Double lozenge tiling with inner patterns 3.8bis

Post puzzles for others to solve here.

Double lozenge tiling with inner patterns 3.8bis

As I like very much the double lozenge tiling with inner patterns, here's a last puzzle with this pattern.
This is an easy one.

Code: Select all
+-------+-------+-------+
! . 5 . ! . 2 . ! . 1 . !
! 6 . . ! 3 . 8 ! . . 9 !
! . . 4 ! . . . ! 2 . . !
+-------+-------+-------+
! . 7 . ! . 1 . ! . 9 . !
! 1 . . ! 8 . 4 ! . . 2 !
! . 8 . ! . 7 . ! . 6 . !
+-------+-------+-------+
! . . 9 ! . . . ! 5 . . !
! 3 . . ! 1 . 5 ! . . 7 !
! . 6 . ! . 8 . ! . 4 . !
+-------+-------+-------+

.5..2..1.6..3.8..9..4...2...7..1..9.1..8.4..2.8..7..6...9...5..3..1.5..7.6..8..4. #  1632 FNBTHW C28.m/S8.f
SER = 3.8
denis_berthier
2010 Supporter

Posts: 1983
Joined: 19 June 2007
Location: Paris

Re: Double lozenge tiling with inner patterns 3.8bis

I cheated and used Hodoku, which gives an OTP solution with Just one Swordfish. Leren
Leren

Posts: 4006
Joined: 03 June 2012

Re: Double lozenge tiling with inner patterns 3.8bis

Leren wrote:I cheated and used Hodoku, which gives an OTP solution with Just one Swordfish. Leren

Difficult to beat you on that.

I use Hodoku occasionally and I like is clean interface. I also like its clear definition of the rules used (though its formulation of some Uniqueness rules could be improved) and the accompanying examples. Being written in Java, it's highly portable. Like Sudoku Explainer, I have no problem running it on my Mac, even with the recent versions of MacOS that no longer support 32-bit code.

However, I can't say I'm very familiar with Hodoku (or SE). SudoRules finds a Naked-Pair and a Hidden-Pair before a Swordfish:

Code: Select all
***********************************************************************************************
***  SudoRules 20.1.s based on CSP-Rules 2.1.s, config = S
***  Using CLIPS 6.32-r773
***********************************************************************************************
hidden-single-in-a-column ==> r3c6 = 1
whip[1]: c2n4{r8 .} ==> r7c1 ≠ 4
naked-pairs-in-a-row: r8{c3 c8}{n2 n8} ==> r8c7 ≠ 8, r8c2 ≠ 2
naked-single ==> r8c2 = 4
hidden-pairs-in-a-row: r2{n1 n2}{c2 c3} ==> r2c3 ≠ 7
whip[1]: r2n7{c8 .} ==> r1c7 ≠ 7, r3c8 ≠ 7
swordfish-in-columns: n3{c2 c5 c8}{r3 r5 r7} ==> r7c9 ≠ 3, r7c6 ≠ 3, r5c7 ≠ 3, r5c3 ≠ 3, r3c9 ≠ 3
stte

Is this due to some Hodoku default priority settings (e.g. Swordfish > Pairs) or did you choose some specific settings?
denis_berthier
2010 Supporter

Posts: 1983
Joined: 19 June 2007
Location: Paris

Re: Double lozenge tiling with inner patterns 3.8bis

No, just compressed use of jargon by me. The OTP move follows one or more basic moves, which for Hodoku on this puzzle were :

1. Hidden Single r3c6 = 1; 2. A pointing pair of 4's r46c1 ; 3. NP (28) r8c38; 4; Naked single r8c2 = 4; 5. NT (457) r2c578; 6. A claiming pair of 7's r8c78;

OTP move: SF (3) c258 / r357; stte

Same as you I think.

Leren
Leren

Posts: 4006
Joined: 03 June 2012

Re: Double lozenge tiling with inner patterns 3.8bis

Leren wrote:No, just compressed use of jargon by me. The OTP move follows one or more basic moves, which for Hodoku on this puzzle were :
1. Hidden Single r3c6 = 1; 2. A pointing pair of 4's r46c1 ; 3. NP (28) r8c38; 4; Naked single r8c2 = 4; 5. NT (457) r2c578; 6. A claiming pair of 7's r8c78;
OTP move: SF (3) c258 / r357; stte

I see. Yes, same Swordfish, but I find no NT before it; instead I have a HP (but that must be the result of different priorities in Hodoku.

BTW, what does "OTP" stand for?
denis_berthier
2010 Supporter

Posts: 1983
Joined: 19 June 2007
Location: Paris

Re: Double lozenge tiling with inner patterns 3.8bis

OTP stands for One Trick Pony ie a puzzle that needs only one non basic move to solve.

The daily puzzles on this forum (when they resume) are supposed to be OTP grade. Due to a historical quirk, the one trick is not supposed to be a basic fish, so they are never actually used.

Leren
Leren

Posts: 4006
Joined: 03 June 2012