Texas Hold'em with bets fixed to set units.
Opponents fold less, and pot odds are always good. Preflop and the flop use the small bet as the unit; the turn and river use the big bet (twice the small bet), raises go up one unit at a time, and there are at most 4 bets per round. Example: required equity is 22% to defend the BB, 15% on the flop, 19% on the turn, 14% on the river. The H in HORSE.