Chess is used at run time in 10 crates (of which 1 optionally).

Depender (with downloads and own rev deps) Chess version
1 pgn-rs ^3.2.0
mdbook-chess ^3.2.0
c4-e5-chess ^3.2
chess_perft ^3.1.1
ascn-rs ^3.2.0
board-game ^3.2.0
bughouse ^3.2.0
chess_game ^3.2.0
crabfish ^3
120 1 vampirc-uci optional ^3.2