D5 in chess is a when Black[hats] make a suicidal move moves off d5 which then white ]hats[ can move onto. It's a suicide movement on blacks side https://chess.stackexchange.com/questions/6486/why-is-d5-the-best-move-in-this-position#:~:text=Taking%20on%20d5%20is%20positional,the%20black%20king%20rather%20airy.

D5 in chess is a when Black[hats] make a suicidal move moves iff d5 which then white ]hats[ can move onto. It's a suicide movement on blacks side https://chess.stackexchange.com/questions/6486/why-is-d5-the-best-move-in-this-position#:~:text=Taking%20on%20d5%20is%20positional,the%20black%20king%20rather%20airy.