In the chapter Before You Play, Know the Score! of Blackjack Attack 2e, Schlesinger says on page 292:
"To be sure, all systems gain in value if 100additional indices are employed. But that gain is not constant across all systems. And so, one of our entries, which may underperform a given "rival" on these pages, may very well outperform that same count, when both are fully parameterized."
What two count systems is Schlesinger referring to?