19 luglio

[liù]

X-COLORS,5 may be deleted from red and entered on blue cells
* color1 r1c8,r5c7,r6c5,r9c6,r7c9,
* color2 r1c9,
* deleted number 5 from r9c9,

X-COLORS,5 may be deleted from red and entered on blue cells
* color1 r6c5,r9c6,
* color2 r6c8,r1c9,
* deleted number 5 from r9c8,

FORCING CHAIN, number 7 , r6c2
* If r6c2=7 then
* r6c4 = 3
* r6c5 = 5
* r7c5 <> 5
* r9c4 = 4
* r7c5 <> 4
* r7c5 = 3
* r3c5 = 2
* r1c4 <> 4
* r1c4 <> 3
* r1c4 = 2
* r3c5 <> 2
* CONTRADICTION
* cell r3c5 is at the same time = and <> 2
* deleting 7 from r6c2

XY CHAIN, 8 , or in r7c9 , or in r3c3
* If r7c9 = 5 then
* r1c9 = 9
* r1c2 <> 9
* r2c3 = 9
* r8c3 = 5
* r3c3 = 8

SIMPLE COLORS, number 4 it is possible to delete the candidate from red cells
* color1 r7c3,r9c4,
* color2 r9c2,r7c5,r5c3,
* deleted 4 from r5c4 ,

X-COLORS,3 may be deleted from red and entered on blue cells
* color1 r6c5,r1c6,r3c1,r9c4,r8c2,
* color2 r6c8,
* deleted number 3 from r9c8,

X-COLORS,4 may be deleted from red and entered on blue cells
* color1 r1c4,r7c5,r9c2,r5c3,r4c6,
* color2 r1c6,
* deleted number 4 from r5c6,

XY CHAIN, 1 , or in r4c2 , or in r5c4
* If r4c2 = 4 then
* r4c6 = 8
* r5c6 = 3
* r5c4 = 1

LOOP, contradiction found, r1c8
* If r1c8=5 then
* r1c8 <> 7
* r7c8 = 7
* r7c8 <> 1
* r7c1 = 1
* r9c1 = 8
* r9c9 = 9
* r1c9 = 5
* r1c8<>5
* CONTRADICTING THE HYPOTESHIS
* deleting 5 from r1c8

XY CHAIN, 3 , or in r1c6 , or in r9c4
* If r1c6 = 4 then
* r4c6 = 8
* r4c8 = 9
* r1c8 <> 9
* r1c2 = 9
* r8c2 = 3
* r9c2 <> 3
* r9c4 = 3


Hanno risolto:
Bruno61

[liù]

Chiedo scusa per il ritardo, ma ogni tanto il tempo mi gioca strani scherzi.

Alternativa, unica, di BRUNO

Se R3C5=2 -> Rettangolo unico 34 R1C4/R1C6/R9C4/R9C6 -> R9C6=5
Se R3C5=3 -> R6C5=5
Elimino i 5 da R7C5 e R5C6

Se R3C5=2 -> Coppia nuda 34 R1C4/R9C4 -> R6C4=7 -> R6C2=8
Se R3C5=3 -> R1C6=4 -> R4C6=8
Elimino l'8 da R4C2

Finned XWing in R7C3-R5C3/R7C5-R45C5 elimina i 4 da R5C4 e R5C6

XYWing R6C2/R6C4/R5C6 elimina gli 8 da R5C2 e R5C3

Se R3C5=2 -> Coppia nuda 34 R1C4/R9C4 -> R5C4=1
Se R3C5=3 -> R1C6=4 -> R4C6=8 -> R5C6=3 -> R5C4=1
R5C4=1

Empty rectangle R6C5/R6C8 elimina il 3 da R9C8

Se R3C5=3 -> R7C5=4 -> Coppia nuda 58 R7C3/R7C9 -> R7C2!=4/R7C2!=5
Se R3C5=2 -> Coppia nuda 34 R1C4/R1C6 -> R1C1=2 -> R7C2=2
Elimino 45 da R7C2

Se R3C5=3 -> R7C5=4 -> Coppia nuda 58 R7C3/R3C3 -> R8C3=9 -> R2C3=7 ->
R2C7=9 -> R1C9=5 -> R7C9=8 -> R7C3=5 -> R8C2=3 -> R7C2!=3
Se R3C5=2 -> Coppia nuda 34 R1C4/R1C6 -> R1C1=2 -> R7C2=2
Elimino il 3 da R7C2

Se R7C5=3 -> R8C7=3
Se R7C5=4 -> Coppia nuda 58 R7C3/R3C3 -> R8C3=9 -> R8C7!=9
Elimino il 9 da R8C7

Il 9 o in R4C5 o in R5C5
Se R4C5=9 -> R4C8=8 -> Rettangolo unico 35 R5C5/R5C8/R6C5/R6C8 -> R5C8=9
Se R5C5=9 -> R5C7!=9
Elimino il 9 da R5C7