Pitch and toss was an old gambling game played in Europe. In the game players would throw coins at a wall, the objective is to throw your coin so it lands closest to the wall. Once all the coins were thrown, the winner would collect them all and keep them. In this poem the line "And risk it on one turn of pitch-and-toss" refers to not being too attached to one's belongings. The interesting thing about pitch-and-toss is that it does require some skill, therefore Kipling is not telling readers that risking all your profits in a game of luck is a smart. Kipling is showing that it is important to not be too attached to one's belonging's, but also to be sure you always have control over it, even if it is in a game of pitch and toss.