Triangles strategy

In brief

Every line can help your opponent. Take the triangles you're left, avoid drawing the second side of a triangle the other player will close, and look for the line that closes two triangles at once.

Taking what's offered

When two sides of a triangle with no stars in it are drawn, the third scores a point for whoever draws it. Before any other calculation, check whether such a line exists: it's a free point.

Don't draw the second side

The opposite trap: drawing the second side of a triangle means leaving the third to your opponent. Below, Player 2 has just drawn B–C; 1 scoring line remains, and it's the opponent's turn.

After B–C, line A–C (dotted) closes ABC: a point handed to the opponent.

Near the end of the game, it sometimes happens that every remaining line gives something away. You then have to choose the one that gives away the least.

Aim for the double triangle

A line can close two triangles at once. On a quadrilateral whose four sides are drawn, the diagonal closes two: whoever draws the fourth side therefore gives away two points. In the example game at Medium level, 2 lines close two triangles at once.

Four sides drawn: the diagonal A–C or B–D will close two triangles.

Using the inner stars

A large triangle that contains a star doesn't count. However, each line to that star cuts the large triangle into small triangles that do count. In the example, the last line to star D closes 2 at once.

The large triangle ABC doesn't count: D is inside it.

With the Replay option: chaining

When the "Replay after a triangle" option is on, every triangle you close gives you another turn. A run of triangles ready to close then becomes a series of points in the same turn: in the game with the option, Player 1 closes 3 triangles with 3 lines without handing over the turn.