Chess, with a color in place of every piece.
pxchess replaces the drawn pieces with twelve colors: six pieces, two sides. Learn the key in a minute, then read the board as a pattern.
The key
A standard diagram draws a horse for the knight and a crown for the king. pxchess keeps one square of color per piece and nothing else. Each piece has its own hue; the black side wears a deeper shade of it.
Once the twelve colors are familiar, the drawings are no longer needed. What remains is where the pieces stand and which squares they hold.
From the anthology
Famous games, each stopped one move before the decision. Look at the position, find the move, then play it out.