Here is a hand that includes some range based decision-making. Hand #684777440 · Replay Poker
Hero is UTG 5-handed w AKo. Open to 3.5x is pretty standard. Might go smaller short-handed but it is pretty standard to generate some folds and plenty of value. Hero has history with BTN and SB, so it is easier to define ranges than versus unknowns.
BTN 3-bets to 7.75x and SB cold calls and it’s back on hero. BTN is loose-aggressive and likes to raise rather than call, has position on hero. Generally, the very small 3-bet seems like a mistake, but it actually makes some sense. He is getting a great price if he generates a fair amount of folds, which he probably does, plus he has a chance to play in position and get more folds on later streets or get paid when he does have a hand. A bigger 3-bet would not allow his opponents to make as many calling mistakes to see flops against him OOP. But, because he knows hero’s opening range is wider than most, he can 3-bet a bit more often.
SB’s cold call turns his hand pretty face up, or he is making a strange play. The only hands that really make sense to cold call are hands with lots of equity that have the potential to outflop big hands like KK/QQ, so his range should be pocket pairs and maybe AQ/AK. Weaker aces will lose big pots when outkicked, broadways are dominated, and suited connectors don’t flop monsters often enough, which will put him in weird spots with draws against big pairs.
Hero now has a decision to make. The price to call is extremely good, and on Replay a 3-bet often means exactly KK+, especially a small 3-bet because it doesn’t look like it is intended to generate folds. However, BTN is the kind of player to make a light 3-bet, especially against hero, so AK is actually ahead of BTN’s 3-bet range. Plus, the cold call by SB makes the pot bigger and seems to cap his range, so it is more lucrative to try to win the pot with a 4-bet. Calling leaves hero out of position, and since he will miss the flop 2/3 of the time he will most likely have to give up. The other benefit of 4-betting is that it defines ranges. If either BTN or SB has KK/AA, then against a 4-bet they are likely to shove rather than call because it looks like hero won’t fold. On the other hand, if hero calls the 3-bet and an ace or king hits the flop hero is going to want to play for stacks but could be up against a real monster.
So, hero 4-bets to 30.5x. This means that to break-even on a call SB and BTN would need 38% equity against my range, but the decision is not that simple because BTN would be in position but have SB still to act behind him and SB would be out of position. It would actually be surprising to see a call because it seems like either folding or shoving would make the most sense. SB does call, and it is difficult to define a range that can call.
If SB defines hero’s 4-bet range as QQ+/AK then the only hands with 38+% equity are QQ+/AK, and he is OOP so it will be extremely hard to realize that equity against hero. If he includes some bluffs in hero’s range like A5s/A4s and 76s then he has the equity to call with pocket pairs and suited Ax, but again it will be tough to realize that equity. On the other hand, if there is a chance hero makes a wild bluff or bluffs way too much then calling could make sense. Most likely SB has a pocket pair and believes he can win a stack every time he flops a set and easily get away on bad boards. Calling with AK/AQ does not make sense because they do not hit often enough, he is OOP, and if he does flop a pair it can be dominated by QQ/KK/AA.
So the flop comes J25 rainbow. Checks to hero. I would define SB’s range as exclusively pocket pairs and capped at JJ or maybe QQ, particularly 88 to JJ. So, SB has 9 potential set combos, but if we assume villain has more 88-JJ than 22-77 that leaves only 3 combos of sets versus 18 combos of 88/99/TT. Hero bets 40bb into a pot of 70bb, meaning that if hero loses every time SB calls, he needs SB to fold 36% of the time to make the bet profitable. But if SB’s range is 88-JJ and he folds 88-TT then he will be folding 86% of the time (18 out of 21 combos), making the bet massively profitable. If SB’s range is 22-QQ and he folds everything except 22/55/JJ/QQ then he folds 74% of the time (15/57 combos), again making hero’s bet very profitable.
Now, SB could continue with a much greater proportion of his range (66+) and make hero’s bet less profitable, but it will be very difficult for SB to make it to the river with less than top pair, and hero still can improve with an ace or king or backdoor broadway draw. This shows the importance of aggression and position, as well as the inherent weakness of calling. It requires a much stronger hand to withstand aggression and not fold so often that you make an opponent’s bets automatically profitable.
Now, you may be saying, what if SB is slow-playing AA/KK and has hero nearly dead? It would still be a huge mistake from SB. Why? If hero simply calls BTN’s 3-bet then SB is going to a flop OOP against two opponents. Both his opponents would also have all possible sets in their range and could have lots of equity with draws. Slow-playing a monster here (and in general) would sacrifice value, lose iniative, allow opponents to realize their equity, and create very difficult decisions later in the hand.