It is surprisingly easy to create a normal curve in R. I was curious to see how many moves my games last for, and the distribution around it. I used the data frame I have created for classical games, and this is the code you need to create the curve:

normal_curve <- ggplot(tal, aes(x = NMoves))+

+ stat_function (fun = dnorm, color = “red”, args = list(mean = mean(tal$NMoves), sd = sd(tal$NMoves)))

You have to specify the variable name for which the curve has to be created, and then specify it again to calculate the mean and the standard deviation as shown above. Running this code will create a normal curve for you as shown below.