That depends on what you mean. It is implied already if what you mean is losing a piece running it up onto an enemy piece that it can't capture. A capture of any kind shows up in the capture list. If it doesn't show up in the capture list, it isn't a capture and will not reset the the 50 move count.
(esconder) Se apenas lê regularmente alguns fóruns, pode adicioná-los à sua lista de fóruns favoritos indo à página desse Fórum e clicando no link "Adicionar à minha lista de fóruns favoritos". (pauloaguia) (mostrar todas as dicas)