Betza's funny notation ones. The notation is based on dividing moves that can be made on a board of squares into groups of symmetry-equivalent moves, the moves within a group differing only in the direction in which the step is taken. Each such group (referred to as "atom") is indicated by a capital, such as N for the 8 moves of the knight. The letter that represents the atom is usually the first letter of the simplest piece from current or historic chess variants that has this move, such as A and F for the alfil and ferz of shatranj (ancient Arabic/Persian chess).
Piece by Piece Tour about opener Pentatonix. She stated she hoped to convince them to sing with her during her set. Nick Jonas and Tyler Shaw were scheduled to open up for Clarkson in October 2015 in Canada, before dates were ultimately cancelled. On May 21, 2015, it was announced that singer Abi Ann would also be opening up for Clarkson. Clarkson confirmed plans to include "Piece by Piece" singles "Heartbeat Song" and "Invincible" in the set list for the show, alongside album-only tracks, "Dance With Me" and "Tightrope", with the latter promised to be a highlight for the show. Speaking to "USA Today",