# Heads Up NL Holdem: Best strategy against all in every hand

Assume you are playing a NL Holdem tournament heads up where the starting stack is 200 times the big blind. What is the best strategy against these all-in scenarios, and what is the expected win percentage when implementing the best strategy against these scenarios?

1. Opponent goes all in every hand.
2. Opponent plays Sklansky's System.

I'm guessing there is some software out there that has already calculated the answers?

Update: Bogdan mentions in his answer below that in the case of Sklansky's system, if the opponent moves all in on your raise, you should fold since you know he has AA, KK, or AKs. (I assume he meant fold unless you have AA.) He all but said the perfect strategy would then be to make a small raise every hand you are first to act, and therefore you will either win, or end up folding to AA, KK, or AKs. In light of this, I think we would have to revise the system a bit, or else you could simply make a small raise every hand you act first (yielding nearly 99%ish win rate of those hands), and just letting the opponent fold when he doesn't have a push hand when he's first to act, so you can blind out the opponent with this strategy. Since we're talking about heads up, I think it would be better to omit the part of the system that says what to do if the opponent raises. So for #2 above maybe we should just assume the system will use the same all-in hands regardless of first to act or not.

Note, what I'm actually after is the expected win percentage in this scenario. I'm expecting the answer to #1 to be something like: call the all in with the sklansky system hands and you'll win this tourney 5X% of the time. Or call with pocket pairs and you'll win 6X% of the time. Or call with Ax, 88+ and you'll win 7X% of the time, etc. I have no idea how to figure out how to calculate what those percentages are for this though, since you get blinded off every time you don't play a hand.

• What stacks should we assume? Commented Sep 11, 2019 at 14:28
• @David - funny that it took 6 years for someone to point out that the ratio of blinds to stack size is absolutely necessary to answer this question. (If the blinds are low and the stack size is huge, then you can sit and wait for premium hands.) I just checked the WSOP heads up event and the ratio of BB to starting stack is 200, so I updated the question to assume that. Thx for pointing this out.
– TTT
Commented Sep 11, 2019 at 18:13

## 3 Answers

Of course that you can beat both systems by calling with KK+, but we are here to win and exploit our opponents, so we won't play only the nuts. You can build your own calling ranges to get the preflop equity that you want, but remember that here there is a trade-off between equity and how many times you actually win the HU battle. If you play only AA, against a random hand you're an 85% favorite... but how often do we get AA?

Against shoving every hand, my best bet is to call with 22+ and AJ+. This might seem a little nitty, but you will win, in the long run, in about 68% of the time, with the added bonus that your opponent will never know if you'll call or not and, until he figures out your strategy, he'll get stacked off 7 times out of 10. You can add some more hands in the mix, if you like to gamble, but I'm more of a pragmatic type and I want to win also. So, I'll stick with the range stated earlier.

Against Sklansky's method, it's even easier. You know his ranges, you know his play, so it won't be a big deal building a counter-exploitive strategy.

If there is a raise in front of you, then you go all-in if you have any of the following hands: A pair of aces A pair of kings Ace king suited

Counter-strategy: fold every time.

If no one has raised in front of you, then you play a little bit looser. You're going to go all in with any pair, any suited connector bigger than 34 suited, and ace - little card suited, and any ace king.

Here, we can talk a little bit. The range recommended by Sklansky, 22+, 45s+, A2s+, AKo is 13.12% of the total number of combinations. To be at least flip against this range, you need... well... the same range. To win more than 50% of the time, we go back to range building, by trial and error. My rule of thumb here, when building ranges against a defined range, is to begin with a range that is half the given one. So, we'll take 13.12/2 = 6.56% of the entire range, which is:

88+, A-10s+, KJs+, AQo+

Against his range, you have 58.61% equity.

But I am not satisfied. 58% is too low to take against a mechanical, known strategy. So, we'll refine the initial range a little more. Let's get rid of the Kx hands, because we can get into a domination situation, with us on the wrong side. Our refined range #1 will be:

88+, A-10s+, AQo+

Which is 6.18% and which gives us exactly 60% equity.

How much you want to refine this range is up to you. In the end, it will be an optimum between the pre-flop equity and the actual number of times that you get your cards and he shoves.

I hope it helped.

Good luck!

• I believe your first sentence is not true. I don't think you'll win very often if you only play KK and AA. Of course it depends on the blinds to stack size, but let's say it's 100 to 1. (\$1000 buyin starting with \$5-10 blinds.) Against scenario 1, you'll be out \$15 every two hands you don't play, or \$7.50 on average per hand. So you can last 133 hands before you bust out. If you don't see KK or AA in 133 hands, you'll bust out without ever seeing a hand. Furthermore, if you finally play a hand say after blinding off half your stack, even if you win, you're still only back to where you started.
– TTT
Commented Apr 10, 2013 at 23:10
• (Comment length is limited so I'm using multiple comments.) I think your on to something with 22+, AJ+. I think the numbers you are quoting though, are the precentages for winning the hands you play, but doesn't necessarily correlate to your chances of winning that particular tournament, since you're also losing all of the hands you don't play at all, and your stack is dwindling in the process. Your comment of "until he figures out your strategy" doesn't apply since he doesn't care- he never even looks at his cards.
– TTT
Commented Apr 10, 2013 at 23:15
• Ahah! You're definitely on to something with the counter strategy to sklansky's system with AA, KK, AKs. You didn't actually say it but I'm going to put words in your mouth and revise the question. Great point!
– TTT
Commented Apr 10, 2013 at 23:18
• @TTT You have a point: I didn't take into consideration the effective stack sizes and the blinds/antes of the tournament. If you have 5 BBs, then this entire theory goes out on the window and you call ATC, hoping you'll win. I took into account the fact that you have enough BBs left for you to be able to pull out some maneuvering. The 22+, AJ+ range is a variation of a principle against guys open-shoving every time, stated by Dan Harrington: "wait for a decent hand and then call". Again, we must correlate the range with how many BBs do we have. In the respect of BBs left, you're right. Commented Apr 11, 2013 at 5:37
• For any given pair of stack sizes, I think it should be possible to determine the minimum hand with which one should call, and that the more BB one has the tighter one should be. The size of the opponent's stack is relevant because if larger than one's own it would affect the likelihood that the opponent might lose a hand and still win the tournament; if smaller than one's own it would affect the likelihood that one could go all in and lose the hand but still win the tournament. Commented Oct 9, 2016 at 20:51

Check out these two great links. These people have already done the math for you.

http://www.pushfoldcharts.com/headsup/

http://www.holdemresources.net/h/poker-theory/hune.html

Generally people call way too tights in short stacked heads up, so you can even shove wider than these charts (I promise), depending on your opponent.

You haven't mentioned how deep you are playing, but for under 20 BB these sites have solved the game for you. As stacks get deeper I would advice to call off tighter, since if he really is shoving every hand, you can wait and get it in as a big favorite.

Villain goes all in every hand

Say blinds are 1, 2 and you start with 200 (100 bb)
You need all 400 to win

It would seem safe to just wait for AA but the problem there is getting blinded off as you only get that 1/221. If you wait 110 orbits you have paid 330. Most likely you will hit AA in 2/3 but you still go broke as are behind where you started.

You are going to need to win two hands as you are getting blinded off. So the problem is reduced to what is the maximum blinds you can lose. That magic number is 66.67 chips = 22.22 orbits.

``````start       200.00
lose blinds -66.67
net         133.33
double up   266.67
lose blinds -66.67
net         200.00
double up   400.00
``````

You can play a little tighter as if you cripple them they would have to win back to back. If you allow yourself to lose 80 chips and win back to back villain is left with only 80 chips after you win 2 pots. And the number are cleaner.

``````start       200.00
lose blinds -80.00
net         120.00
double up   240.00
lose blinds -80.00
net         160.00
double up   320.00
lose blinds -80.00
net         240.00
double up   480.00
``````

So now you are playing 26.67 orbits = 53.33 hands. You can be very selective - the top 1.88% of the hands. That is JJ+. But on average you hit in 2/3 the number. If your chance is 1 in 100 then you will typically hit in the first 67. So you can tighten up to QQ+. After you win the first you can afford to get blinded off some more so you can tighten up to KK+. If you crush them to 80 chips of less after winning the second pot then tighten up to AA only - you only need to get it in before they get to 200 chips. If it goes 3 and you lose the 3rd then loosen up to JJ+ as you risk getting blinded off - you want to get it in before you get to less than 120 chips. You may even take them down in 2 pots as there will be variance in how many hand you need to play. About 1/2 the time you will take then down in pots. With this strategy you win 2/3 of the time.

• Essentially you are saying: call with JJ+. If your opponent gets short however, you should call off tighter? How does it make sense to call a 100BB shove with JJ, but fold to a 50BB shove with KK? This basically allows for more variance and you allow your opponent to catch up, with allows for even more variance after that. Commented Mar 20, 2017 at 11:57
• with that logic you should be folding kings for a 3BB shove, since you will probably get aces before your opponent has 200 chips and you can get it in as a bigger favorite. That logic is wrong, because the game doesn't have to be over when you call off, since you can also lose. Calling off wider will result in you having more chips when you lose relative to calling tight, while still having great equity (only a few percentages less on average) versus a random hand. You will therefore have a bigger advantage over your opponent. Calling off tighter when stacks get shorter is simply wrong. Commented Mar 20, 2017 at 13:04
• update your answer and thank me for my input. Don't start deleting your comments and downvoting my answers. Again I don't understand how you got 3000 reputation xD. Commented Mar 20, 2017 at 14:29
• @RaymondTimmermans I don't thank you and there is a be nice policy here. Commented Mar 20, 2017 at 14:31
• I am also sure that there are policies that you need to be open-minded for new ideas and you shouldn't downvote answers just because they are answered by me. Commented Mar 20, 2017 at 14:32