I know the theory behind the push or fold in heads up (Is well explained in The mathematics of poker of Chen & Ankenman). I know that exists software (e.g. ICM trainer) that computes the push or fold range, even in ICM scenario, in a multiway hand in push or fold regime. I am wondering which is the algorithm. In other words which is the fictitious play algorithm that this software are using? Well I am reading Kill Everyone of Lee Nelson, and in this is book is presented a table where you can know if push or fold the Hole cards based in in your stack and the M factor and I would like to reproduce this table. I googled a little bit but I had not found any reference.