- Code: Select all
`+---+---+---+`

|813|925|467|

|245|768|931|

|967|341|285|

+---+---+---+

|176|859|342|

|4..|...|...|

|...|...|...|

+---+---+---+

|...|...|...|

|...|...|..3|

|389|274|516|

+---+---+---+

8139254672457689319673412851768593424..................................3389274516

What is the maximum number of emtpy cells possible in exactly two strings?

Here's one with 50:

- Code: Select all
`+---+---+---+`

|492|6..|...|

|...|...|...|

|...|...|..8|

+---+---+---+

|315|978|246|

|946|5..|...|

|...|...|...|

+---+---+---+

|...|...|...|

|...|..5|124|

|751|426|893|

+---+---+---+

4926......................83159782469465............................5124751426893