Sklansky's 7 Groups of starting hands

[sparky3474]

Are Sklansky's 7 Groups of starting hands as good as they can be? We have EV data and simulations available that suggest some hands in Groups 4,5,6 and 7 could be revised. I found a simulation called "Players Guide" with other recommendations, is this better or more accurate? See www.cs.cmu.edu/People/mummert/poker/