Concept No. 11: A big bet is the most relevant and accurate information available.
Concept No. 50: If someone bets the flop and gets two or more calls, anyone who bets a significant amount on the turn should get respect.
From No Limit Hold'em Theory and Practice by Sklansky and Miller
MGM Grand $1-$2 NL. I have about $300 in front of me and open limp from UTG with 99. Five callers comprising EP, MP, button, SB and BB. The flop is
K 9 6 rainbow
SB bets $10, BB folds. I don't find this flop particularly threatening, so I smooth call my set. EP calls, MP goes all-in for $13, and button, SB, myself and EP are the only callers. However, before I call, I make the cardinal error of asking whether I can raise. I know the rule and the answer, of course, is that since the all-in was less than one and a half times the original bet, it cannot be raised. My inattention would cost me dearly.
Turn : 5
SB checks, I check, EP and MP check, and button after a brief pause goes all-in. He has me covered and I am perplexed by the disproportionate size of the bet. I haven't seen this player before and have no read on him. SB instafolds and I cannot help but think that if not for my stupid raise question, I would be facing a much smaller and easily callable bet. Still, I call almost instantaneously, not even thinking about his hand. EP and MP fold.
River : A
He turns over 87o for the nut straight. I reach for my wallet and rebuy in disgust, lessons learned.