What is "checkmate!"

Checkmate! is a collaboration album by Japanese popsinger Namie Amuro, featuring a collection of her collaborations with other musicians released between 2003 and 2011, as well as four new collaborations. The album was released on April 27, 2011, about one month after its original release date, due to 2011 Tōhoku earthquake and tsunami.

Two songs were released as digital downloads prior to the album, " Wonder Woman" in early March prior to the album's postponement, as well as " Make It Happen" on April 20, a week before the album's release.