Rules - Four Rivers Mahjong Solitaire
This is similar to traditional Mahjong Solitaire, but with different rules regarding when tiles can be removed.
Tiles are matched the same way as in traditional mahjong solitaire. But matches are no longer based on sliding tiles left and right.
Instead matches are only allowed if the tiles can be joined, with 3 or less lines. These lines must be straight, at 90 degrees, and must not pass through any other tiles. The lines can be any length.
The first example shows a straight line drawn between two tiles.
Here is an example using two lines...
Here are some examples using three lines...
And here is an example that cannot be matched. The two green 'clamshells' cannot be matched, because it would take 4 lines to join them...