On page 160 of the classic "Blackjack Attack" table 9.4 offers the following:
Playing Hours: 1
TRIP BANKROLL REQUIREMENTS: 21 (units)
Expectation in units won:2.5
Risk of Ruin: 40%
[2-deck, favorable rules, 6 to 1 spread, 75% dealt]
40% Risk of Ruin is a far cry from the 90-100% figure given by several on this topic in several threads below. (albiet for single deck action)
I estimated 15% risk of ruin for just 3 rounds dealt, single deck.
Given Schlesinger's figures, that sounds about right.
This should settle this ridiculous argument.