- The pieces fall from the top edge of a 19x19 board.
- Each piece consists of 4 stones.
- A stone is either black or white.
- If a string of one color is tightly surrounded, is removed. (This is the same as the capture rule in Go.)
- If a single string of one color forms two or more eyes, it is removed. Note, unlike Go, in this game, eyes formed by adjacent strings are not included in determining if a group has two eyes.
http://chesstris.com/2007/10/03/play-go-tetris-10/