> Would a TC or +3 have an estimated 1% advantage in a
> typical 6 deck shoe game?

Depends on rules, penetration, and if you use indices. For example, using I18, a 4.5/6, s17, das game has edge of 1.41% at TC = +3, floored. No DAS?: 1.25%; DAS and LS?: 1.64%.

Don