Was realy great coaching, and finally understand Call20 rule.
Here are some examples:
PokerStars - $0.02 NL (9 max) - Holdem - 9 players
CO: $3.28
BTN: $0.77
SB: $1.15
BB: $2.28
UTG: $1.42
Hero (UTG+1): $1.50
MP: $0.75
MP+1: $0.98
LP: $0.17
SB posts SB $0.01, BB posts BB $0.02
Pre Flop: ($0.03) Hero has 5♥ 5♣
fold, Hero calls $0.02, fold, fold, fold, fold, BTN raises to $0.08, fold, fold, fold
BTN wins $0.07
So in this example BTN must be at least 1,20$ to call and try to hit set, right?
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PokerStars - $0.02 NL (9 max) - Holdem - 9 players
SB: $1.01
BB: $2.51
UTG: $1.97
UTG+1: $1.56
MP: $1.44
MP+1: $2.00
LP: $2.09
CO: $1.09
Hero (BTN): $1.44
SB posts SB $0.01, BB posts BB $0.02
Pre Flop: ($0.03) Hero has 6♣ 6♠
fold, fold, MP calls $0.02, fold, LP raises to $0.08, fold, Hero calls $0.08, fold, fold, fold
Flop: ($0.21, 2 players) 3♦ 6♥ 7♣
LP bets $0.10, Hero calls $0.10
Turn: ($0.41, 2 players) J♦
LP checks, Hero checks
River: ($0.41, 2 players) 4♣
LP checks, Hero bets $0.18, LP calls $0.18
Hero shows 6♣ 6:spade
LP mucks 9♦ 9:club
Hero wins $0.74
And here I cold call PF from BTN, becouse opp has 2,09$,
0.08x20=1.60$ So on flop hit a set and get paid.