Delta

Delta, created by Swiss chess problem composer Erich Brunner, comes with two small boards (one is 5x5 rectangles, the other is 6x6 squares), nine triangular pieces in two colors, and one extra piece in a third color. In Delta, after entering their initial pieces by a free placement, players alternate moving pieces of their own color on the 5x5 board at least two spaces (vertically, horizontally or diagonally), then placing a new piece on the space last passed over by the moving piece. The goal