Triple Forcing Chain 2/5/8 in r1c3 implies r9c2 must be 7
Triple Forcing Chain 2/5/8 in r1c3 implies r9c7 must be 3
I have never heard of a TRIPLE forcing chain. Hopefully someone will be able to explain it to me and perhaps refer me to a link where I can read more about it.
Thanks
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*-----------*
|1..|...|..6|
|.6.|4..|.3.|
|..7|.2.|8..|
|---+---+---|
|..9|583|4..|
|...|2.6|...|
|..4|917|6..|
|---+---+---|
|..1|.3.|2..|
|.8.|..4|.9.|
|5..|...|..1|
*-----------*
*-----------*
|14.|3..|..6|
|.6.|4..|.3.|
|..7|62.|8.4|
|---+---+---|
|6.9|583|4..|
|...|246|...|
|..4|917|6..|
|---+---+---|
|491|735|268|
|.8.|164|.9.|
|5.6|892|.41|
*-----------*
*-----------------------------------------------------------*
| 1 4 258 | 3 57 89 | 579 27 6 |
| 29 6 258 | 4 57 189 | 1579 3 2579 |
| 39 35 7 | 6 2 19 | 8 15 4 |
|-------------------+-------------------+-------------------|
| 6 127 9 | 5 8 3 | 4 127 27 |
| 378 1357 35 | 2 4 6 | 159 1578 359 |
| 38 235 4 | 9 1 7 | 6 258 35 |
|-------------------+-------------------+-------------------|
| 4 9 1 | 7 3 5 | 2 6 8 |
| 237 8 23 | 1 6 4 | 357 9 57 |
| 5 37 6 | 8 9 2 | 37 4 1 |
*-----------------------------------------------------------*