In this part of the poem "If," Kipling has the speaker advising his son to not place too much value on material possessions, particularly at the cost of advancing other efforts.
Pitch-and-toss is a game in which you attempt to throw some object closer to a goal than does anyone else who is playing. The game becomes a form of gambling when players place bets regarding whose toss will be the most accurate.
In the poem, the son is being challenged to accept the loss without complaining or bemoaning the fact if he should "make one heap of all your winnings and risk it on one turn of pitch-and-toss." The speaker is making the point that you should keep on trying and striving for the best that is within you, regardless of the success or failure of one individual effort.
In this poem"if" by rudyar kipling...it talks about how to become a "man".i.e. a fully matured person who's ready and prepared to face any kinda situation and can survive that difficulty.the line"and risk it on one turn of pitch-and-toss" talks about the bravery.
The poet says that if you are brave enough to keep all your achievements on one side and take a risk and lose them all and again stand up to start all over again and even don't grumble about your loss or ill-fate, then you can become a "man"