SIX IN A LINE
Six cells of your colour in a row or a column and the table is yours. Diagonals are not lines. Everybody drops into the same well, one seat at a time, and nothing is ever cleared — what lands, stays.
TWO CELLS ARE YOURS
A piece is four cells and only two of them come out in your colour — you choose which two with E. The other two go down as grey grid: nobody's, and in everybody's way. A window with one grey cell in it is dead for every seat at the table, including you.
BUILD, OR STAND IN THE WAY
Two cells is never enough to finish a line in one turn, so no move can win out of nowhere — which means every threat gets seen a turn before it lands. The cell that would carry a line is lit on the floor in that seat's colour. One lit cell, and somebody has to answer it.
TWO AT ONCE
One live line gets blocked. The way you actually win is to make a move that lights two cells at once — the other seat can only stand in one of them. Everything else in this game is the setting-up.