Tuesday, December 30, 2008

Late position hands versus a raise and reraise

Everyone agrees that no matter what you position, if action gets raised and reraised in front of you preflop, you get supertight and play only the absolute best hands, or fold. The universally agreed upon standard is to only play AA, KK, QQ, AKs and AKo, and to cap the betting with a 3rd raise if you can. Some will advocate playing JJ here as well, and maybe even to reraise wth AQs.

The Maverick profile is super loose with pairs by these standards, cold calling 3 bets with as little as 99 and capping with JJ and up, though it won't play any non-pair other than AKs and AKo. For my trials, due to the lengthy period of time it takes Turbo Texas Hold'Em to run 100,000 raised and reraised trials, I will only run trials for a small handful of hands, with the button locked one seat to the left of the trial player, with obviously AA and KK excluded since we know these hands still thrive against 3 preflop bets.

PairsNet $
Per-Hand
(3/6)
QQ4.32
JJ-0.24
TT-3.08
AKs0.23
AKo-2.81


As expected, QQ was profitable, with JJ and TT posting losses. The surprise is that AKs showed only a slight profit, with AKo posting a huge loss! Perhaps the high rake of 3/6 kills the profitability of AK.

Monday, December 29, 2008

Late position trials versus a raise

With the button locked in one seat to the trial player's left, 100K trials were run against a raise in front for the Maverick's desired range (hands in parentheses are played sometimes):

3bet: AA-99, AKs-AJs, AKo-AQo, KQs
Call: 88-66, A10s, AJo, KJs(-K10s), QJs(-Q10s)

Fairly tight range. Here are the results, again with top hands omitted since we know they play profitably:

PairsNet $
Per-Hand
(3/6)
TT1.72
990.16
88-0.59
77-0.82
66-0.98


AcesNet $
Per-Hand
(3/6)
AcesNet $
Per-Hand
(3/6)
AKs3.84AKo2.59
AQs1.84AQo0.24
AJs0.54AJo-1.35
A10s-0.27


KingsNet $
Per-Hand
(3/6)
KingsNet $
Per-Hand
(3/6)
KQs-0.58QJs-0.63
KJs-0.42Q10s-0.73
K10s-0.45J10s-0.69


Pairs: Tens do fine, but then 99 shows only a marginal profit (a subsequent trial with 99 cold calling only showed a $0.03 profit), before we see a huge loss for 88. I did not run a trial where 99 was cold called, since I figured it would post a loss that way given a raise reduces the field enough to not give 99 proper odds to try and flop a set. And 88 showed such a large loss that I did not believe a trial with 88 reraising would improve it to profitability even if I believed such a trial would show a better profit (and my middle position trials showed that 3-bet raises against a range with smaller pairs typically led to even bigger losses).

Aces: Suited aces see profitability until after AJs, where A10s showed a loss. AKo showed a big win, but AQo showed only a marginal profit, and AJo posted a massive loss ($-1.35 per hand is equal to a loss of $40 an hour, nearly 7 big bets!).

Others: None of the other hands showed a profit. KQs was a big loser (and a manual trial with KQs being limped did not show a significant improvement). Prior middle position tests indicate that 3-betting the other hands instead of cold calling with them will not improve their results.

From this, we can gather that, against a raise and yet to enter the pot, we tighten up considerably, reraising every playable hand listed: AA-99, AKs-AJs, AKo-AQo

This makes up 5.4% of playable hands. Everything else is folded. Basically, the numbers show us that we want no part of any pot that gets raised in front, unless we have a hand we're willing to 3-bet with.

Keep in mind this is much different from a pot we enter, whether limped or raised ourselves, that gets raised by someone after us. Once it comes back to us, we typically need to call one bet to stay in the pot and there's quite a bit of money already in the pot as a result, so we have usually odds to try and draw against what's probably a better hand.

Sunday, December 28, 2008

Late position hands vs limpers

With limpers behind us, our range tightens up, but now our options expand, because players limping in front generally means more money in the pot improve our pot odds for drawing. Even if raised behind, many of those players will call and we will call as well, improving the payout when our biggest draws come in.

However, do we limp behind or do we raise? Unlike when 1st in, raises probably will not thin the field, as those who limped behind us will probably call. A raise with limpers in should be for value to build a pot for big hands and draws.

The Maverick profile plays this way with limpers behind:

Raise: AA-77, AKs-A9s, AKo-A10o, KQs-KJs, KQo, QJs
Limp behind: 66-44, A8s-A2s, K10s-K2s, KJo, Q10s, QJo, J10s-J8s, 10-9s to 10-8s, 98s

With the button locked in one seat to the test profile's left, I conducted 100,000 hand trials for each hand listed using the Maverick's strategy for each respective hand. Again, top hands like AA and AKs were omitted since we already know these hands are hugely profitable in each situation and running a test to verif this would be as big a waste of time as having a calculator output the results of the equation 3+3 one hundred times. We know 3+3=6, and we know pocket Aces and AKs are very profitable against limpers.

PairsNet $
Per-Hand
(3/6)
PairsNet $
Per-Hand
(3/6)
992.61660.00
881.4555-0.35
770.7344-0.50


AcesNet $
Per-Hand
(3/6)
AcesNet $
Per-Hand
(3/6)
AQs4.03A4s-0.09
AJs3.21A3s-0.24
A10s2.61A2s-0.33
A9s1.61AQo2.61
A8s0.44AJo1.64
A7s0.20A10o1.19
A6s0.05A9o0.10
A5s0.06A8o-0.51


KingsNet $
Per-Hand
(3/6)
KingsNet $
Per-Hand
(3/6)
KQs2.39K8s-0.20
KJs2.02KQo1.03
K10s0.96KJo0.22
K9s0.24


OthersNet $
Per-Hand
(3/6)
OthersNet $
Per-Hand
(3/6)
QJs1.53J9s-0.19
Q10s0.54J8s-0.51
Q9s-0.1610-9s-0.23
Q8s-0.4010-8s-0.56
QJo-0.1598s-0.55
J10s0.51


Pairs: Again, we see a profit until we pass 77, where 66 breaks even and everything below posts a loss.

Aces: Suited Aces see a profit until it reduces to a trickle for A6s, and becomes a loss for A4s and below. A9o and A8o were added in manually, as A10o, the bottom end of Maverick's range, showed a large profit. Offsuit Ace-broadway posts big wins, but then we see a precipitous drop for A9o, though we still see a slight profit. At A8o, however, we see a loss.

Kings: Suited King-broadway shows a big profit, then K9s shows a slight profit when limped before K8s shows a loss. KQo shows a sizable profit, then KJo shows a small but discernible profit. I did not add and test K10o, anticipating it would post a loss given the downward trend between KQ and KJ.

Others: Queen-broadway posted a profit, but then we see a huge drop to Q9s, which posts a loss. And this is where the offsuit broadway profitability ceases, as QJo shows a slight loss. J10s showed a good profit, but J9s showed a loss. Ten-9 suited posted a loss, and 98s posted a loss.

***

That all said, some of these hands were limped behind rather than raised. I manually adjusted the Maverick profile to raise with the limping hands, and ran subsequent 100K trials from the same position to compare their profitability.

(I also added some hands that Maverick did not originally play: these hands are left blank in the 'Net Limp Behind' column and won't have data for the 'Net Raise Advantage' column.)

HandNet
Limp
Behind
Net
Raise
Limpers
Raise Net
Advantage
A8s0.441.140.70
A7s0.200.670.47
A6s0.050.410.36
A5s0.060.560.50
A4s-0.090.310.40
A3s-0.240.220.46
A2s-0.330.080.41
K10s0.961.470.51
K9s0.240.550.31
KJo0.220.730.51
K10o-0.02
Q10s0.541.130.59
Q9s-0.160.130.29
QJo-0.150.360.51
Q10o-0.31
J10s0.510.860.35
J9s-0.190.060.25


In literally every case, raising the limpers instead of limping behind added value to each hand played. Both previously unplayed hands still posted a loss, but every hand that was previously unprofitable when limped became at least slightly profitable when raised instead.

Therefore, it may be advised to take a raise or fold approach to entering a pot in late position. With this data, we can adopt a revised preflop strategy against limpers:

Raise AA-77, Axs, AKo-A9o, KQs-K9s, KQo-KJo, QJs-Q9s, QJo, J10s-J9s

This makes up a little over 17% of possible hands. Given their minimal profitability, you could omit J9s, A9o and A2s if you wished, which leaves a little less than 16% of possible hands. It may be best to compromise with these hands: entering the pot with J9s and A2s only with several limpers in (at least 3, if not 4 or more) behind due to their drawing strength, or entering with A9o only with one limper or two due to its need for isolation.

Saturday, December 27, 2008

Late position hands when first in

Rather than itemize subsets, I'll go ahead and post results en masse of large-scale trials, and then itemize key points afterward.

The Maverick profile on Turbo Texas Hold'Em plays the following hands in late position when 1st in:

AA-44, AKs-A2s, AKo-A10o, KQs-K2s, KQo-K9o, QJs-Q5s, QJo-Q10o, J10s-J7s, J10o, 10-9s to 10-7s, 10-9o, 98s-96s, 87s-86s, 76s.

I tested each hand over 100,000 trials, with the button locked one seat to the test profile's left, and with no other players having entered the pot.

Due to the high volume of playable hands in late position that I needed to test, hands that would obviously turn a profit when raised were omitted. There's no need to run 100,000 trials for open raising AA or AKs, when we know those hands turn huge profits in most situations, let alone when 1st in. Several other hands that showed a healthy profit in middle position were also omitted.

All hands 1st in opened with a raise. We've seen in previous trials that, with few exceptions, hands show maximum profitability when 1st in with a raise over limping when 1st in. As you find later position preflop, raising becomes even more important, as you vastly improve the chances of folding marginal hands behind you and that only players in the blinds will call, often with lighter holdings than they'd typically play against a raise due to having blinds in the pot and receiving a discount to call. Thus you not only will usually have the best position in the hand postflop, but your holdings on average will be stronger than theirs.


PairsNet $
Per Hand
(3/6)
880.90
770.25
66-0.12
55-0.57
44-0.85


AcesNet $
Per Hand
(3/6)
AcesNet $
Per-Hand
(3/6)
A9s1.20A5s0.26
A8s0.70A4s0.15
A7s0.47A3s-0.01
A6s0.19A2s-0.06
A10o1.11A9o0.39


KingsNet $
Per-Hand
(3/6)
KingsNet $
Per-Hand
(3/6)
K10s1.08K3s-0.67
K9s0.52K2s-0.70
K8s-0.01KQo0.68
K7s-0.20KJo0.70
K6s-0.32K10o0.31
K5s-0.47K9o-0.33
K4s-0.61


QueensNet $
Per-Hand
(3/6)
QueensNet $
Per-Hand
(3/6)
QJs1.15Q7s-0.60
Q10s0.84Q6s-0.63
Q9s0.27QJo0.51
Q8s-0.30Q10o0.12


OthersNet $
Per-Hand
(3/6)
OthersNet $
Per-Hand
(3/6)
J10s0.70J10o0.00
J9s0.1010-9o-0.74
J8s-0.3098s-0.48
J7s-0.7097s-0.84
10-9s-0.0287s-0.80
10-8s-0.3286s-0.98
10-7s-0.8376s-0.97


Pairs: You can profitably open with pairs down to 77. 66 and any lesser pair posts a loss.

Suited Aces: Even the marginal A9s posts a big profit when open raised. The other aces show progressively lesser profitability until we see a small loss with A3s and A2s. It's possible the smallest Aces can still profit if there are enough callers in the hand due to their drawing status and the need for great pot odds to draw.

Ace-10 offsuit is a big winner. A9o also showed a profit, though the drop was precipitous enough that A8o was figured as a loss (a 100K side trial confirmed that A8o posted a -0.12 net).

Kings: K10s and K9s posted a reasonable profit, but K8s posted a small loss, and losses mounted for the remaining suited Kings. Offsuit King-broadway hands posted a win, but K9o posted a sizable loss, over $0.60 per hand less than K10o.

Queens: QJs posted a sizable gain, as did Q10s. Q9s even showed some profit when opened, but Q8s showed a sizable profit drop and a loss, with subsequent lower hands posting big losses. QJo posted a significant profit, with Q10o posting a slight profit, indicating a small margin for error in playing such a hand profitably.

Lesser hands: J10s showed a sizable profit and J9s showed a slight profit, but J8s and J7s showed losses. No ten high suited or lower suited hand showed a profit. J10o broke even and 10-9 offsuit posted a big loss. The drawing power of these hands do not make enough profit against the rake in 3/6, so they aren't playable as they would be in many other limit hold'em games.

Using this data as an indicator, a revised preflop open raising strategy would raise profitably with these hands:

AA-77, AKs-A4s, AKo-A9o, KQs-K9s, KQo-K10o, QJs-Q9s, QJo-Q10o, J10s-J9s

This makes up a bit over 18% of all possible hands.

Ill finish this entry with a digression: Since this was tested in a game with 3-4 players to each flop, a $3 max rake and $1-2 jackpot drop, and a little under half of the hands played being raised before the flop, obviously some adaption would be required for looser games.

But on average, 3/6 games in many areas often feature the aforementioned sub-optimal environment, and that's the main goal of this project in any case: to devise a winning strategy in a sub-optimal 3/6 game. We already have strategies designed to succeed in more ideal low limit games that work when 6-7 players see a flop in a passive game. Small Stakes Hold'Em was written exactly for these games, and the strategies in most books are designed for these games. When it comes to more sub-optimal games, basically every writer recommends that players not play in these games.

Most of us don't have the luxury of being able to headhunt for great games, thus these efforts.

Saturday, December 20, 2008

King-high hands in middle position

King-high hands carry 2nd nut flush potential when suited, and top pair potential either way. King-broadway hands also carry higher chances of a straight than Ace-high hands, as they have chances of flopping an open ended straight draw, which has higher odds of trning the straight than a broadway or gutshot straight draw. However, they are behind right off the bat to any Ace-high hands and can be outkicked when the kicker pairs, if someone holds an Ace and pairs the same card.

The only King hand Maverick likes to raise against limpers is KQs. After that, it will only limp behind with KJs, K10s and KQo. Every other hand, even though you open raise with them, gets folded against any action in front. Against a raise, Maverick will only play KQs and KJs.

HandAction
When
1st in
Action
With
Limpers
Action
When
Raised
Net $
Per Hand
(3/6)
KQsRaiseRaiseCall1.09
KJsRaiseLimpCall1.02
K10sRaiseLimpFold0.72
K9sRaiseFoldFold0.00
K8sRaiseFoldFold-0.31
K7sRaiseFoldFold-0.21
KQoRaiseLimpFold0.04
KJoRaiseFoldFold-0.03


And as we can see, Maverick's selective for good reason. KQs was the most profitable at $1.09 a hand, a little over 1/3 of a small bet. Only KJs and K10s showed any significant profitability besides KQs. KQo finished a hair above even and K9s finished just about even. All other hands were a loser.

Offsuit aces in middle position

Maverick only plays offsuit Aces with a broadway kicker in MP, raising when facing one bet, but only playing for two or more bets with AK or AQ. The key with these hands, if they don't hit the unlikely Broadway straight, trips or two pair, is to flop top pair with either top kicker or a strong kicker.

HandAction
When
1st in
Action
With
Limpers
Action
When
Raised
Net $
Per Hand
(3/6)
AKoRaiseRaiseReraise2.60
AQoRaiseRaiseCall1.39
AJoRaiseRaiseFold0.91
A10oRaiseRaiseFold0.55


All four hands deemed playable turned a profit. No hands below A10o were tested given early position trials showed significant dropoffs and subsequent losses for hands A9o and below. 10's tend to show as the profitability cutoff point in these trials.

Suited aces in middle position

Suited Aces carry the key strength of the maximum potential for a nut flush when 3 cards of their suit hit the board. In middle position, Maverick raises limpers with broadway Ace suited hands, calls with other Aces down to A4s, open raises with any suited Ace, and will only play against a raise with Ace broadway suited: it will call with AJs and A10s, but will 3-bet with AQs and AKs.

HandAction
When
1st in
Action
With
Limpers
Action
When
Raised
Net $
Per Hand
(3/6)
AKsRaiseRaiseReraise4.10
AQsRaiseRaiseReraise2.79
AJsRaiseRaiseCall1.96
A10sRaiseRaiseCall1.44
A9sRaiseCallFold0.62
A8sRaiseCallFold0.40
A7sRaiseCallFold0.06
A6sRaiseCallFold-0.07
A5sRaiseCallFold-0.07
A4sRaiseCallFold-0.26
A3sRaiseFoldFold-0.29
A2sRaiseFoldFold-0.29


Proftiability as played remains until you get down to A7s, where the profitability as played is slight at best, then everything below A7s is a loser. Once you get below A10s, the suited Aces' only real value comes from their flush potential, as when the Aces pair, their kickers are weak, leaving holders with a second best hand when someone else plays their stronger Ace.

Even when you pair the weaker kicker, the pair is rarely top pair on the flop, let alone by the river, typically leaving you with 5 outs to improve (three Aces and two more of your weaker kicker). Only when a player lands two pair or trips does the hand retain strong value. Axs is a hand limited in its drawing potential if the x isn't 10 or higher.

Friday, December 19, 2008

Middle position profitability for middle pairs in middle position

For each hand set, I will list the Maverick preflop strategy when 1st to enter the pot, when others have limped in front, and when someone has raised in front. When a player behind reraises after the simulator has entered a pot, the simulator is instructed to call an extra bet for nearly all hands listed.

If it's two or more bets back to the simulator, it won't continue without a supremely strong hand like AA, KK, QQ or AK, maybe JJ. If the simulator reraised itself, it did so with a very strong hand like AA, KK, AQ or QQ. It's likely the action will not come back to him, or that betting will be capped preflop if it does, in which case the simulator would probably stay in. If it's two more bets back to the simulator, it's likely someone has one of the aforementioned monsters, and obviously there's little value to continuing with a hand like AJ or KQ, which is probably way behind before the flop.

The following table illustrates 100,000 hand trials in middle position for playable pairs 99 to 55, which fall in the Maverick profile's playable range. Pairs ten and up aren't included, since those hands are definite winners in any position for two bets, even more in most cases. For example, there's no need to run trials for pocket Aces, when we know pocket Aces is a big winner whether for one, two or four bets.

HandAction
When
1st in
Action
With
Limpers
Action
When
Raised
Net $
Per Hand
(3/6)
99RaiseRaiseCall1.25
88RaiseRaiseCall0.40
77RaiseCallCall-0.56
66RaiseCallFold-0.63
55RaiseFoldFold-1.42


Notice how the profitability coincides with the aggressiveness exercised when other players limp in front. For all playable pairs (as with all hands under Maverick), you would raise if 1st in, but your strategy varies when others enter the pot before you.

My key observation is that hands that limp behind other limpers show far less profitability, but they're also lower in rank, increasing the risk of overcards and getting outdrawn on the flop (if they're not already facing overpairs preflop). Granted, this is a risk regardless, and the idea overall is probably to play cheap and hope to flop a set, or fold. 88 and higher play strong enough that they could win on their own in some cases, plus of course Broadway pairs (AA-TT) usually can win on their own.

Nonetheless, limping allows other marginal hands to limp behind, increasing this likelihood that a hand will outdraw on the flop. So I tested 77 and 66 over 100K hands each with a strategy to raise against limpers instead of limping along, to deter marginal hands behind and thin the field. I omitted 55 because it's -1.42 loss rate indicates that even an improved strategy wouldn't make it profitable from MP.



HandLimp
Net $
Raise
Net $
77-0.56-0.38
66-0.63-0.30


Raising limpers reduced the loss of each hand, but did not make the hand profitable. And as we saw in previous trials, open limping these hands instead of open raising them almost always reduces the expected value of a hand, and when it improves the value, the improvement is typically insigificant. The potential improvement of limping either of these hands likely wouldn't offset the $0.30+ losses per hand that these hands see.

Thursday, December 18, 2008

A look at the Maverick preflop strategy

The Maverick strategy follows a varied, somewhat convoluted preflop strategy in middle position.

When first in: Raise AA-55, all suited Aces, AKo-A10o, KQs-K7s, KQo, KJo, QJs-Q8s, QJo, J10s-J8s, 10-9s, 10-8s and 98s.

Limpers in front: Raise AA-88, AKs-A10s, AKo-A10o and KQs. Call 77-66, A9s-A4s, KJs-K10s, KQo, QJs-Q10s and J10s.

Raised in front: Reraise AA-TT, AKs, AQs and AKo. Cold call JJ, TT, and AQs.

Fold any hand not listed for that particular situation.

You'll notice that for some hands, you'll raise if 1st in, but fold them to a raise, or raise them when facing one bet, but fold them when facing a raise. You can open raise with K9s, but if anyone enters the pot in front, you'll fold, even for one bet. Or you'll enter a pot for one bet with A5s, even raise if 1st in, but you'll fold against a raise.

David Sklansky refers to this paradox as the Gap Concept, where a player needs a stronger hand to call a raise than he needs to make the raise in the first place. In layman's terms, when no one has raised in front, it's likely that your hand is stronger than the hands of those before you, whether they folded or called. Plus, when you raise and make it two bets to call for everyone after you, they typically won't enter unless they have strong hands themselves. Your raise indicates a strong hand, even if you raise with a marginal hand like Q8s. Open raising increases the strength of your hand, as players behind you with marginal hands will fold them, reducing your opposition.

However, if someone were to raise from early position, it's likely you're facing a big pocket pair or a big broadway hand like AQ. Q8s doesn't match up well against AQ or pocket Jacks, so you should fold to a raise. But if everyone in front has limped, your Q8s is likely competitive. If you're the first player to bet preflop, your Q8s not only may be the strongest hand, but it's less likely that anyone else at the table has a hand stronger than that, because the first few players have folded.

You'll also notice that you'll call a raise with suited versions of hands you would not play against a raise if unsuited, such as AJ. The suitedness gives you an opportunity for Ace, King or Queen high flushes if two of your suit flops, even a dim chance thereat if one of your suit flops. This adds to the high pair potential and vague broadway straight potential of hands like AJ and KQ. With offsuit hands, you're basically banking on spiking top pair or better, maybe a straight.

With the $3 max rake and $1-2 jackpot drop of a 3/6 game, hand values get undercut, and the key is to find the hands that retain positive value after these cuts. The optimal end strategy will be tighter than the typical winning low limit strategy, but this will minimize leaks and ensure maximum profitability.

Monday, December 15, 2008

Examining software strategic profiles for profitability in a typical 3/6 game

Before proceeding with middle position trials, I wanted to make sure we were using an optimal strategy. I decided to run some preliminary 500K trials on Wilson Turbo Texas Hold'Em using the following profiles:

Conan the Librarian: Typical tight aggressive profile that plays about 18% of hands.
Bret Maverick: The v6.0 Advisor. The software author's optimal Limit Hold'Em strategy as derived from lengthy research.
Nicely Nicely Johnson: Tight aggressive preflop, but plays hands passively postflop, keeping pots as cheap as possible until the big hands hit. I have noted in previous trials that this profile has shown routine, minor profitability in some 3/6 environments.
Gypsy Rose: Tight passive pre, playing the same hands as a typical TAG but rarely raising. Tight aggressive postflop.
Lee Jones Hybrid strategy: Programmed in manually. Preflop strategy is taken from Lee Jones' Winning Low Limit Hold'Em. Postflop strategy is a cautious, relatively passive strategy that avoids aggression without a strong made hand or strong draw.

I simulated 500,000 hands for each profile in a 3/6 Limit Hold'Em game with a 10% $4 max rake and $1 jackpot drop (to simulate typical Seattle area conditions: 10% $3 max rake with a $1-2 jackpot drop) plus a $1 toke for every pot larger than $13 (leaving 2 big bets).

For opponents, I used a set of 8 average profiles, of which two or three were TAG profiles and the remaining profiles a bit loose (35% of hands played) but reasonably thoughtful, with one or two programmed to draw regardless of pot odds (typical of some weak players in low limit games).

To properly simulate a typical, not-as-friendly low limit game, I made sure none of these profiles were particularly loose. I also set the simulator to periodically vary the strategy of these other profiles to mix things up. This table saw an average of 3.8 players to the flop. This is not a friendly game, but the idea is to develop a strategy that can beat a sub-optimal low limit game. Any loose low limit game can be potentially profitable despite the rake, but such conditions aren't frequent, and with the current recession, such conditions will become more rare as fish and dead money disappear.

ProfileNet $
per hand
Conan-0.12
Maverick-0.08
Nicely-0.11
Gypsy-0.09
Lee Jones-0.05

As you can see, all these hands post a net loss over 500,000 hands. As experts say in their texts, these tight strategies indeed cannot turn a profit at 3/6 due to the rake and jackpot drop.

All of these strategies have playable hands that lose money at such a 3/6 table. I believed I could improve the profitability of each strategy by eliminating the starting hands that showed a long term loss over several thousand samples. For each strategy, I decided to improve the starting hand requirements using a simple, crude method I examined data the chosen starting hands and noted only the hands that turned a significant profit (more than $0.10 per hand), eliminating the others.

On average, the following hands showed a profit with each profile: Pairs AA-88, AKs-A8s, AKo-AQo, KQs-K10s, QJs, J10s. All other playable hands posted a loss, including small pairs, suited connectors down to 54s, weak suited Aces, suited Kings down to K7s, suited Queens down to Q8s, suited Jacks down to J8s, and unlisted offsuit Broadway hands.

Each profile had its share of limited exceptions: Maverick and Conan profited with AJo and A10o. Maverick turned a profit with KQo. Maverick and Gypsy profited with Q10s, plus Maverick turned a profit with 10-9s. The Lee Jones profile won with 77. Some also turned a loss with the aforementioned profit hands: 88, A9s and K10s were losers for Nicely. Maverick and Nicely turned a loss with 88 and QJs. Granted, some of these losses could also be a factor of how the strategies played these hands preflop: raising with these hands could be a leak, or maybe the hands are played too passively. But we'll examine the strategy for hands later.

For now, I omitted the leak hands for each profile and ran another 500K test with revised starting hand requirements in the same environment. From here, I'm looking for significant improvements in win rate (or in this case, reductions in loss rate). I also cleaned up the strategies: allowing for more limping behind with draw hands such as Axs and small pairs, knowing the postflop strategy would dump them on the flop if a set or flush draw didn't flop. The original strategies, for some reason, didn't exercise this strategy with limpers in front, curious since most times you limp behind, you will see a multiway flop with the implied odds to draw, or flop a big hand that's way ahead, even if you have to call an extra bet when someone raises behind you.

The results are noted along with the original results below:

ProfileOriginal
Net $
per hand
Revised
Net $
per hand
Conan-0.12-0.02
Maverick-0.08-0.02
Nicely-0.11-0.08
Gypsy-0.09-0.05
Lee Jones-0.05-0.04


Again, all profiles showed a net loss, but certain profiles saw significant improvement in profitability potential, while others barely budged.

While the Lee Jones profile showed the least loss originally, an adjustment of the starting hand strategy netted minimal improvement. This is likely because the starting requirements for the Jones profile were tighter originally than the others, so there was minimal room for improvement. The other strategies had relatively loose starting hand requirements, playing weaker suited Kings, Queens and Jacks in middle position, for example. Once the K7s and Q8s hands were ditched, most of the strategies improved quite a bit, though they still posted a loss.

The biggest net improvment came from the Conan profile, which produced the biggest original loss, but immediately improved to tie for the lowest loser with the Maverick profile, the official software advisor, which also saw a significant improvement, though not as great.

Though these starting requirements were deemed optimal by software designers, they also assume games with a minimal rake, while dismissing lesser games as unbeatable. Bob Wilson himself has noted how a relatively higher rake can turn a normally profitable hand into an unprofitable hand, though stronger hands still remain profitable despite it.This leads  me to believe that the key to finding a profitable 3/6 strategy is to take a normal strategy and eliminate lesser drawing hands whose payoffs are reduced by the rake, or at least reduce the circumstances in which they're played to profitable circumstances.

As we see here, by noting the drawing hands that post a loss and eliminating them from the starting strategy, while maintaining a typically solid postflop strategy, you can improve your profitability in games with a relatively high rake.

Now, before we begin trials in middle position, which profile will we use as a strategic baseline? While the Conan profile showed the biggest improvement, I decided to go with the software advisor Maverick. The end profitability was the same, and while it didn't improve as much once the starting strategy was sharpened, it also originated with a small loss rate than the Conan profile. It is also the advisor, which the designers concluded was an optimal strategy, and its solid postflop parameters are fairly similar to the Conan profile, if not nearly the same. And finally, the starting hand selection for the Maverick profile is a bit looser than Conan, which will allow me to run trials for more starting hands directly from the profile, without needing to manually configure a revised profile to test additional hands.

In trials for middle position, late position and the blinds, I will focus on the hand selection for the Maverick profile as our control profile. Later, we'll run tests for the Conan profile in kind, and see if we note any improvements in profit.

Monday, December 8, 2008

Expanding parameters as we move to Middle Position

Before my week long hiatus due to personal matters, I ran initial trials in middle position for the Conan Librarian TAG strategy and a version of the strategy where every hand was limped.

I collected considerable data, but intermittently during my week's personal trials, I thought of the process and eventually realized that a factor would create several more variables for middle position play: unlike Early Position, chances were likely that a player in middle position would face action in front. An Early Position player could elect to limp or raise knowing he was usually 1st in, and comparing the profitability of either play was simply a matter of simulating 100,000 trials of each starting hand for each play.

However, a middle position player could face being 1st in, or face one limper, or face several limpers, or face a raise in front, or a raise and one or more callers in front. Each of these situations creates separate sets of variables that affect the profitability of each hand differently, since players will limp certain hands, and raise certain hands, and call raises with certain hands. Obviously, if there's a raise and re-raise, the decision becomes far easier: you're facing a monster and shouldn't play unless you hold AA, KK, QQ or AK. But most action falls into the many former categories.

Therefore, you need to conduct several different forms of trials for each starting hand to get an accurate measure of the hand's profitability. You will need to factor in how a hand plays when raising limpers, when limping behind, when open raising, when open limping, and when calling raises. Add in the fact that more hands are playable from middle position than early position, and you have the making of a long, arduous set of trials, all to determine an optimal middle position starting hand strategy. Plus, all of these hands are played with a static solid postflop strategy that itself has yet to be experimented with. It's enough for an average man to go bald tearing his hair out with.

But these answers aren't going to find themselves, and little in life worth doing is easy. Once an optimal strategy is devised, if you can comfortably profit from a 3/6 game considered by most to be too sub-optimal to play for profit (3-4 players to the flop), it will all be worth it.

The next step will be to determine the exact control parameters to set in the simulator for each trial, to best determine the profitability of each hand. I will outline this process once I devise suitable controls.

Monday, December 1, 2008

EV comparison of hands in early position: Limping vs raising

The following hands were tested over 100,000 trials each from 2nd position at a 9 handed $3/$6 table under two conditions. In the first scenario, every hand listed was limped in. In the second scenario, every hand was raised. The simulator entered every pot that wasn't raised in front by the under the gun player, except in cases of big hands like AA-QQ, sometimes JJ, and AK. However, in the limped trials, no more than one small bet was placed in the pot unless the pot was raised, in which case the simulator reraised.

I notated the net expected value (EV) per hand and winning percentage of each hand over 100,000 hands.


Net Value in dollars for given starting hands
(Pairs and Ace-Broadway suited)
HandLimp EVLimp Win%Raised EVRaised Win%
AA12.6367.912.9874.4
KK8.6356.68.9063.1
QQ5.5750.35.9457.2
JJ3.2344.63.8352.0
TT2.0539.72.6347.5
990.8834.51.5731.5
880.4029.50.4835.8
770.0526.9-0.0524.1
AKs2.7046.04.2354.3
AQs1.5539.62.1849.7
AJs1.2834.61.3445.3
A10s1.1230.31.1539.6


Net Value in dollars for given starting hands
(Offsuit and Marginal Hands)
HandLimp EVLimp Win%Raised EVRaised Win%
AKo1.1342.91.9451.2
AQo0.2034.61.9447.2
AJo-0.1931.50.2340.8
KQs0.7836.10.8042.1
KJs1.1327.30.6234.7
K10s0.6825.70.1830.2
KQo-0.3629.50.5230.3
QJs0.7228.30.2833.7
Q10s0.2424.5-0.0429.4
J10s0.2326.2-0.2328.6
A9s0.3529.30.3036.4
A8s0.0828.7-0.1035.0

Though it's considered common knowledge, the above data confirms that raising before the flop raises the EV and the chances of winning for nearly all of these hands, let alone the top hands, with few exceptions.

Some of these hands maximize their EV when limped instead of raised, though in some marginal cases (like 77 and A8s), the maximum EV is so small that you can argue the hand's not worth playing at all.

The gray area between greater EV when raised and greater EV when limped fell around the AJs/A10s area. With pairs, the shift only occured with 7's, which are a marginal play in any case: any pairs 8 and above are maximized when raised. King high suited hands, save for KQs, showed a greater profit when limped. K9s, not listed above, showed a very marginal EV of 0.05 when limped, and showed a greater loss when raised. The Queen high and Jack high suited hands listed all showed greater EV when limped.

The obvious risk with raising the strongest hands while limping the marginal hands is that, to astute opponents, you may telegraph the strength of your hand when you limp in from early position. For the most part, your opposition in 3/6 limit won't be nearly attentive enough to notice, assuming you limp more hands in middle and late position. If anything, a high enough frequency of raises run a greater risk of tilting the table. Once a player starts raising too often at a low limit table, frequently the other players cease having fun, they tighten up, and will join in the raising act, replacing the profitable loose-passive environment with a tighter, more aggressive game, which vastly reduces profitability at a low limit game where the rake and drop alone leaves you with very little margin for error.

The good news in early position is that few of your hands are playable. Assuming we eliminate the marginal A8s and 77, you will only see a playable hand in early position 9.2% of the time according to PokerStove, and if we base our decision to raise on the highest EV possible per the above chart, we will only raise 7.4% of the time, only one in 13.5 early position hands. If we devised a separate strategy for under the gun, as we'll explore soon, the starting requirements would tighten slightly, meaning even fewer instances of playable hands. In a 4 hour session (roughly 120 hands) or even an 8 hour playing session (240 hands), even if your opponents take notice of your raises, it's highly unlikely you will make enough raises from early position to drive the table nuts and screw the game up.

In fact, once we explore strategies in later positions, we'll find that opportunities to play are so infrequent that we shouldn't get in the way of our opponents very often, which, ultimately, is what we want. We want our weaker opponents pushing most of the action. This way, they're more likely to have fun and remain motivated to keep their money on the table, if not buy-in once they bust and add even more money to the table.