+Baroque Berolina Bicolour Brotherhood
+For Baroque (and Fugue and...) --> maybe a dedicated parent class ?
+
Go game with option oneColor
add variants :
Hmm... non ? -->
Otage, Emergo, Pacosako : fonction "buildPiece(arg1, arg2)" returns HTML element with 2 SVG or SVG + number
+==> plus simple : deux classes, images superposées.