Checkmate is a Game Boy Color chess game. While specific details about its development are unavailable, chess games typically focus on accurate representation of chess rules and a user-friendly interface for handheld play. The gameplay would involve strategic chess moves with potential variations in game modes or difficulty levels. Considering the bilingual nature (En,Ja), it suggests either a simultaneous release or translation effort between English and Japanese markets.  The publisher would be the company who developed and published the game.

Checkmate (Japan) (En,Ja)

Chaoji Yinsu Xiaozi - Super Sonik II