Friday, 24 October 2014

Match 2, NZ vs South Africa preview

Trent Boult may be a key player in match 2
We now have a little more information about Bay Oval, and what it's all about.  We also have seen both teams play.  And really, we don't actually know much more.

Here are some things that I noticed, and some battles to look forward to.

1. Trent Boult vs Quentin de Kock.  de Kock is a good batsman, in good form, but he looked somewhat clueless against Boult, and it looks like he will need to develop a better plan as to how to bat against him.

2. Vernon Philander vs Martin Guptill. Guptill looked completely out of form in the first game, but that's at odds with how well he played in the CPL just recently. Often a batsman looks out of form when a bowler is bowling in places that makes it difficult for him to score.  I think that is what actually happened in the first match. It will be interesting to see if Guptill has managed to figure out how to get some runs off Philander's bowling.

3. Kyle Mills vs Hashim Amla. If Mills plays in this match, it will be interesting to see if he can repeat the dose against Amla. Mills bowled 21 deliveries to Amla, and he managed to only score 12 before getting out. And those 12 mostly came from streaky, un-Amla like shots. Conventional wisdom would say that Amla's too good to repeat that performance, but Mills is a very crafty bowler, and his successes against Chris Gayle say that he is capable of targeting a player and really getting on top of them.

4. Brendon McCullum vs Morne Morkel.  McCullum backs himself to dominate anyone, but he has always found Morkel a difficult bowler to face. Morkel got him in the first match, and McCullum will not want a repeat in the second.

5. Jimmy Neesham vs Dale Steyn. Steyn will be particularly grumpy with the way that Neesham approached their confrontation in the first match. Neesham didn't look phased by the great bowler at all. It will be interesting to see what lengths Steyn bowls to him today.

Betting tips.

If I was betting $50 on this match, here's where it would go:

1. Total match run outs $10 on over 1.5 at $2.80
There were non in the first match, but there were 3 close calls, and that was without the sort of scoreboard pressure that normally brings about run outs. McCullum sets fields trying to get run outs, and ABdV has been working hard on getting the South African fielding back to where they were in years gone by.

2. South Africa top run scorer $10 on AB de Villiers at $5.00
de Villiers has a phenomenal record in the second match of a series. Over the past 3 years he's only had 2 times that I could see that he's hit less than 50 in the second match in a series. He's hit 3 centuries and 2 not out fifties.  He's also got the wood on most of the New Zealand bowlers.

3. New Zealand top run scorer $10 on Tom Latham at $7.50
Latham looked fantastic, and would have been likely to got a big score other than a piece of bad luck against Duminy.

4. Hashim Amla runs $10 on 0-20 at $2.55
I think opening against a line up featuring (at least 2 of) Mills, Southee and Boult is a very difficult prospect.

5. Head to Head $10 on New Zealand at $2.60
New Zealand are a better team than they showed in the last game.  Look for a big step up.

All odds are from NZ TAB and are accurate at time of writing.

Tuesday, 21 October 2014

Match preview 1st ODI NZ vs SA, Mount Maunganui,

The circular Bay Oval, Mount Maunganui
The countdown to the World Cup finally feels like it's started for real. South Africa are touring New Zealand for 3 ODI matches that are more a means to an end than an end in themselves.  Both teams say that they want to win these matches, and the players who get on the field definitely will.  But they are both aware that the real target is the World Cup.

Surprisingly this match is being played at Bay Oval in Mount Maunganui. It's the 4th ground in the Northern Districts area to hold an international match, and is not going to be used in the World Cup.  However, it is in New Zealand's fastest growing region, and is likely to be a place where a lot of international cricket will be played in the future.  It is also on the east coast, so it is a lot less likely to be rained off in spring time than somewhere like Auckland or Wellington.

As there has never been an international at the ground, there are some aspects that are hard to predict. A par score for the ground really has not been established at this level, and almost all of the players will go in without too much baggage (positive or negative) at the ground.

There were a number of warm up matches played there, and we can tell some things from those.

Firstly, bowlers that tend to bang the ball in were punished.  It seems that the fuller the pace bowlers bowled, the better they did. Secondly the scores were all over the place. Some teams were scoring 300+ while others were struggling to pass 150.  Also, the spin bowlers took lots of wickets but (with two exceptions) went for lots of runs. The two exceptions were Daniel Vettori and local boy Jono Boult (brother of Trent)

The ground is an interesting shape, particularly given it's name of Bay Oval. It is a perfect circle. The boundary is 68m from the centre of the pitch in every direction. This means that it has a straight boundary of 79m and a square boundary of 67m. This obviously favours players who are good at playing the hook, cut and scoop shots (which probably explains why bowlers who bang the ball in get punished).

I've looked through the records of the players at similar shaped, coastal grounds in the past 3 years and there are three names that feature at the top of the list: de Villiers, McLaren and well ahead of all else, du Plessis. The top New Zealand name is Williamson (who is not playing) followed by Neesham.

If I was looking to make a couple of bets, I'd look at putting some money on both du Plessis and McLaren to be top scorer. While it's guaranteed that at least one of these bets will fail, I think it would be a sensible move to cover both.  At time of writing, du Plessis is paying $4.50 and McLaren is paying $26 to be top scorer at the NZ TAB. I think this is good money for both of them. du Plessis has gone past 90 in 5 of his last 9 ODI innings. That's compelling form. I'd look at McLaren for a different reason.

The ball is likely to swing at Bay Oval. It's overcast, with showers likely. The tide will turn at about 11:00, an normally the ball swings around the turn of the tide (either just before or just after). Trent Boult grew up in Tauranga so this is his home ground. If he starts getting the ball to go round corners (as he can) he is almost unplayable. In the matches at the Champions League T20 when the ball swung, he was almost unplayable. To go with that, Kyle Mills has been a beast at similar grounds in recent times. He's averaged 11 at an economy rate of under 4. To back that up, in one of the warm up matches (for Auckland against Afghanistan) he took 2/14 off 7 overs. Mitchell McLenaghan is not in such form, but he has a good record against South Africa, and the ability to hurry up batsmen.  I think it's actually quite likely that New Zealand will take early wickets, and South Africa will need to rebuild. That will create a platform for someone like McLaren to succeed.

As far as New Zealand's batting goes, it is a bit difficult to make too many predictions.  Despite his game being suited to grounds like this, Brendon McCullum has never really been successful at this sort of ground. Neesham is opening for the first time, so that will test his technique more than coming in at 6 does, especially against Steyn, Morkel and Philander (Steyn has the second best figures at grounds like this, after Mills, with an average about 18 and an economy rate just under 5). The other interesting selection is Dean Brownlie. Brownlie is particularly good off the back foot, and has had some success against South Africa, but in every large innings that he has put together, he was dropped early (often more than once). If he gets started, he might be worth putting some money on for NZ top scorer, but I certainly wouldn't back him until he made it to 25.

The other thing to watch out for in this match will be the rain.  There may be some showers early on, but it's quite likely that there will be some serious rain in the evening. This means that there is a reasonable chance that the game will be called off early, and Duckworth-Lewis will need to be used.  I'm a big fan of the Duckworth-Lewis system, but it does hurt teams with good batting depth.  The two teams in world cricket that it works against the most are these two. As a result, the team that bats first is likely to have a slight advantage if it rains.

If I had $50 to bet on this match, I'd suggest these:

1. AB De Villiers to outscore Hashim Amla $10 at $1.92
2. Total match run outs over 1.5 $10 at $3.00
3. Faf du Plessis top South African scorer $15 at $4.50
4. Ryan McLaren top South African scorer $5 at $26.00
5. Whoever bats first to win the match $10 at what ever the odds are post toss.

(all odds from the NZ TAB at the time of writing)

Monday, 13 October 2014

Maxwell joins Pringle

One of the matches that got me hooked on cricket was this one in Hobart in 1990, when Australia needed 2 runs to win going into the final over, and Chris Pringle bowled a maiden (assisted by a slightly dubious non-wide call early in the over).

Today, Glenn Maxwell has joined Pringle in the required last over maiden club by bowling Australia to victory in similar circumstances.

It was an incredible effort from Maxwell, but unfortunately, with the history of both Pakistan and of matches held in the Emirates, there is a sniff of suspicion about it.  I really hope that every player was making a genuine effort, as the result is a storybook one.

Wednesday, 3 September 2014

Winning an ODI from the front

Is Cook the captain to correct England's ODI ship?
There have been a lot of debates recently about the role of the top order in an ODI. Is it more effective to come out swinging or is a more cautious approach more appropriate?

Until 1992 the expectation was that the top order's job in an ODI was to see off the new ball, and scoring at 3 an over was fine. If you look at the great opening bowlers of the 80's you will see that most of them had economy rates near 3.5 rpo. Then in the 1992 World Cup something wonderful happened. In the 10th match, New Zealand were playing South Africa, and one of New Zealand's premier batsmen, John Wright, got injured. In came Mark Greatbatch. Rather than playing the traditional openers role, he took advantage of the fielding restrictions and scored 68 off 60, including hitting Allan Donald back over his head for a 6 that landed on the roof of the stand. From this point onwards, New Zealand's approach changed, and the first 15 overs were seen as the best time to score quick runs.

In the 1995/6 Australian tri-series, Sri Lanka took that tactic to the next level. Kaluwitharana and Jayasuriya batted like whirlwinds and not long later they helped take their team to victory in the World Cup. At this point the world really stood up and took notice. The dashing opener was now the in thing. New Zealand had Astle, Australia had Gilchrist, India used Sehwag, Pakistan opened for a while with Afridi. An attacking opener had become as much a part of the game as using a spin bowler in the "boring middle overs."

But recent changes to the game, such as the different fielding restrictions at the end of the game and 2 new balls have meant that some people have questioned if going for it at the outset is such a good tactic now. Is it a better idea to keep wickets hand and "go harder, later."

The majority of this discussion has come out of England, where the roles of captain Cook, Bell and (before he dropped out of the game) Trott have been coming under increasing scrutiny. Are they batting too slow? Are they putting too much pressure on the players coming in after them?

This led me to have a look at the role of the top 3, in the past 2 years. What I wanted to know was what had the biggest impact on a team winning, the openers batting a long time, them scoring a lot of runs or them scoring at a quick run rate.

The first thing that I did was I got a list of the scores when the second wicket fell in each match in the past 2 years, and the outcomes of the matches.

The next step was to graph it, and see what came out.

First I looked to see if there was a different relationship between the overs taken and runs scored for the first 2 wickets for teams that won and teams that lost.




We can see that there is a fairly strong relationship with both graphs.

I set the intercept of the trend lines to 0, so that the gradients are effectively the run rates.

There are a few noticeable differences.  Firstly the teams that win tend to score at a higher run rate for the first 2 wickets than the teams that lose. However when I overlapped the two graphs, this difference was not as striking visually as it is numerically. (After 40 overs the trend lines are actually only 28 runs apart)

More significantly, there's a lot more data above 15 overs on the winning graph than on the losing graph. There is also a lot more instances on the winning graph where the first two wickets have contributed 150 or more runs.

I ran a quick bootstrap analysis and found that there was a statistically significant difference between both the median number of runs scored at the fall of the second wicket by the winning teams and the number of overs that they batted for.

To highlight that difference, I drew a cumulative frequency graph. The difference in the distribution of the number of overs faced by the winning and losing teams is quite striking.

That gave me some reason to search further.  It seems that there is a statistical evidence to say that there is a difference between the performances of the top 3 batsmen of teams that win and lose.

The next question was to see which made more of an impact: the number of runs, the number of overs or the rate that the runs were scored at.

To do this I ordered the innings by each of these three variables, and then looked at how many of the 9 innings surrounding each one were won and lost. This is not particularly intuitive, but it did give me some idea about the impact an increase in the variables would have on the likelihood of winning.

First I looked at run rate:

There is a trend here, but it's certainly not a strong relationship.

It's clear that increasing the run rate that the first two partnerships score at can contribute to increasing the likelihood of winning.

The important number here is the R² value of 0.35914. The closer to one this value is, the more linear the relationship is. While it is not a perfect measure of how strong a relationship is, it is a good indication.

The next graph that I looked at was the total runs scored.

This is a similar relationship, but it is clearly stronger.

The points are generally closer to the trend line and the R² value is higher (0.44074).

The data (expectedly) thins out as the number of runs increases, as it's quite rare for teams to get to 200 for the loss of only one wicket.

The R² value is less than 0.5, so there's still more of the variation that is unexplained than explained by this relationship, but again that is to be expected, as there are a lot more factors in a game than the first 3 batsmen, and it is always possible for a game to change suddenly.

The total runs scored for the first two partnerships seems so far to be a better predictor of success than the rate that they scored at.

The third factor is the one that I found the most interesting.


The relationship between the overs batted and wins looks (unsurprisingly) quite similar to the relationship between runs and wins.

The R² value for overs is lower than the corresponding value for runs, but both are higher than the relationship with run rates.

The point where the teams are winning more than they are losing are roughly 14 overs, 75 runs and 4.7 rpo respectively. These numbers start to give us an idea about what we should be looking for in an opener.

However, I wasn't totally convinced by these graphs.  I wondered if they would have turned out the same if I had chosen to look at 15 innings or 5 innings, or some other slightly different way of looking at it.  So I decided to try looking at the winning probability for individual points.  To do this I rounded the run rates to the nearest 0.1 rpo, the overs faced to the nearest over and the runs to the nearest 5 runs.

Again these graphs were quite interesting.


Visually, the strength of the relationship is indicated by the degree to which the top of the colours bars get close to trend line.

The runs and overs graphs look like they are a better fit than the run rates graph. But we can get extra evidence for the strength of fit from the R² value again.

This time the R² value for overs was significantly stronger than it was for either the run rate or the total runs.

The lower (green) graph suggests that for every extra over before the second wicket falls, the probability of winning increases by about 1.7%

Likewise, for every extra 5 runs scored, the probability of winning increases by about 1.7%

At this point I started to feel like there was some fairly significant evidence that having a top 3 that can see off the new ball is definitely the way to go.

The rate that the top order score at is important, but it doesn't seem to be as important as the number of overs that they bat for.

This makes sense for a couple of reasons. Firstly, a cricket ball is at it's most hittable when it is about 15 overs old. At this point it's still hard enough to go quickly off the bat, it has normally stopped swinging conventionally and hasn't yet started to swing unorthodoxly. The ball is the hardest to play when it is less than 10 overs old, because the ball will swing and seam, and the edges will go to hand, rather than dying as quickly as they do later on.

When the balls are 15 overs old, the match is 30 overs in.  At this point it's sensible for teams to have their best hitters at the crease.  If they are in too much before the 20th over, the hitters are being exposed to a swinging ball that makes it difficult to time their shots.

The next bit of analysis I did was to look at those 3 marks from above (14 overs, 75 runs and 4.7 rpo) and look at the difference in the results between teams that reached these milestones and teams that did not.

The outcomes were again quite interesting:


Here fast was any innings where the first two partnerships scored at more than 4.7 runs per over, big was where the second wicket fell when the score was over 75 and long was where the wicket fell after the 14th over.

The column titled "Relative" is the relative probability.  This means that teams that have their first two wickets score at more than 4.7 rpo are 37% more likely to win than teams who score slower than that.

Again we see that the biggest advantage is when the first two wickets last more than 14 overs.  It isn't a panacea, but it is important.

The final thing I did was to look at two similar skilled options, with different approaches, and see which was best.  To do this I looked at every innings where the second wicket fell between the 7th and 14th over, and the run rate was between 4.7 and 5.3 (this puts them roughly in the 2nd quartile for scoring rates and the 3rd quartile for length). I then also looked at times where the second wicket fell between the 14th and 19th over, with a run rate between 3.8 and 4.7 (which puts them roughly in the 3rd quartile for scoring rates and the second quartile for length).  Again the more cautious approach paid dividends, although this time with a much smaller sample size.

The more attacking start yielded 9 wins and 13 losses (40.9% winning record.) The more cautious start also yielded 9 wins, but only 8 losses (52.9% winning record). The difference here, however, is not statistically significant, given the low sample size. 

Putting this all together, an ideal opener is a player who averages at least 37.5 (half of 75), averages lasting 42 deliveries (half of 14 overs) and has a strike rate of at least 78.3 (equivalent to 4.7 runs per over).  If they a compromise has to be made on one of these it should be the strike rate, as that's the least important to help the team win.

So, finally, how does Alastair Cook stack up to these criteria?

At the time of writing Alastair Cook averages 37.51 runs from 48 balls at a strike rate of 77.66.

He (just) makes two of the 3 criteria, and the one that he misses out on he is very close to, and is the least important.

England have not been going well in ODI cricket recently, but Cook's batting is not the right thing to blame. The issues are clearly elsewhere.

Thursday, 12 June 2014

Some stats after the first test in Jamaica

BJ Watling

BJ Watling has taken 5 dismissals again. He's now joined Parore and McCullum as the only New Zealanders to have taken 5 dismissals in an innings 4 times. Ian Smith only did it 3 times.

He also leads the way in terms of 8 dismissals in a match. He's done it 3 times now, there have only been 3 other times a kiwi has done it, Once each for Smith, Lees and McCullum. He's 5th overall for that, behind Boucher, Gilchrist, Healy and Marsh. (But they all had much longer careers)

He's taken 2.296 dismissals per innings. Nobody who has kept for more than 3 matches has managed that.

He also leads the way for NZ with the bat, averaging 47.25 when he is keeping. The next best is McCullum at 34.18, followed by Blain at 32.30, Parore at 26.94 and Smith at 25.56.

Globally he's 4th of all time, behind AB de Villiers (56.96) Andy Flower (53.70) and Adam Gilchrist (only 0.35 ahead on 47.60). The guy that has traditionally been considered the best ever is Ames, in 5th. He averaged 43.40.

NZ under McCullum

New Zealand have won 4 and lost 4 under McCullum. There have not been many New Zealand captains who had a winning record. Only Fleming, Coney and Howarth have winning records, and Fleming and Coney only by one match.

Under McCullum, they have averaged a collective 33.70, which is only slightly behind the 33.99 that NZ averaged under Wright, but they were ahead of it before they came out swinging to try and get quick runs in the second innings.

McCullum has led NZ to a score of 400 in 9 out of his 15 matches. Only Steve Waugh has a better % of getting 400s.

To put that in context, New Zealand averaged 26 under Taylor with roughly the same players, despite having played in South Africa and England under McCullum.

Boult - Southee combination

In matches where they have played together, Boult and Southee have a combined average of 24.08. This puts them close to the all time great mark (McGrath Gillespie averaged 23.02 and McGrath - Lee averaged 25.32). They are clear of New Zealand's other very good combinations - Bond & Martin averaged a collective 25.01 and Chatfield & Hadlee averaged 25.39.

Peter Fulton

Fulton has only scored 306 runs in his last 10 tests, at an average of 17. However he has still averaged about 30 since he came back, which is still quite high by NZ standards. Even with these games, and the ones where he came in earlier, he's still New Zealand's 11th highest averaging opener ever, one place ahead of Guptill.

His double hundreds against England were not flukes. He was in very good form at the time. In the 21 innings leading up to them he averaged 52.7 in first class cricket. But in the 31 innings since then he has averaged only 18.7. I think it is possible for the selectors to drop Fulton despite still keeping faith in him. They need to say "you are not in great form, but we know that you are a capable player. Go away and get some runs under your belt and we'll pick you straight away."

Wednesday, 30 April 2014

Bowling in the IPL

Last year I had a look at how much wickets cost in the IPL, and devised a formula to calculate the value of a bowler in a team. I used that formula in a number of other cases throughout last year, and it seemed to bring some fairly sensible results each time, so I've decided to try it again with this years IPL as the first stage draws to a close.

Here is the top 15 bowlers, with their modified run rates. This takes into account the benefit that they have provided to the other bowlers in the team through the wickets that they have taken. I limited it to who had bowled at least 10 overs.

NameTeamOversWicketsModified Run Rate
Sandeep SharmaPunjab1172.45
VR AaronBangalore14.582.97
SP NarineKolkata2093.10
YS ChahalBangalore1973.47
SL MalingaMumbai15.373.61
AR PatelPunjab1864.06
MM SharmaChennai15.584.17
KW RichardsonRajasthan1564.40
PV TambeRajasthan2074.60
R DhawanPunjab13.244.65
R AshwinChennai17.554.65
B KumarHyderabad15.364.71
MA StarcBangalore2074.80
IC PandeyChennai1534.87
R BhatiaRajasthan1664.94

Somewhat unsurprisingly the top name in the list is the current rising star of the IPL - Sandeep Sharma.

His heady medium pace bowling has been a big part of the success that Kings XI have enjoyed. Often medium pacers can enjoy good results in limited overs cricket through consistency, But Sharma offers something more than that.

Right arm inswinger is a style of bowling that is normally only seen at the junior grades. Top senior batsmen normally develop a technique that allows them to avoid being dismissed by it, and then they can just wait for the inevitable bad delivery that slips into the pads and can be dispatched.

Sharma has managed to bowl consistently enough that he has only been hit for one leg-side boundary in 11 overs. If players are having to look on the off side for their runs from an inswing bowler then they are at risk of leaving the gate open.

If Sharma manages to continue to bowl as consistently, he could be potentially be a real force, not just for Kings XI, but also for India. He could be particularly useful in the World Cup in Australia/New Zealand where the ability to move the ball in the air is a real asset.

Saturday, 15 March 2014

Is it game over if you lose more than 2 wickets in the powerplay?

I recently observed this conversation on twitter:


It immediately made me wonder if Aakash was correct. Do you lose if you are more than 2 wickets in the power play of a T20 International.

I decided to find out. I felt that it was probably best to only look at situations where a team had batted first, as there is not any external scoreboard pressure (or lack thereof) interfering with the batsmen's mind sets.

I looked at every match where there was a result inside 20 overs (I ignored matches that had ended in a super-over or bowl-off) and looked at how many wickets down the team were after 6 overs. I didn't count "retired hurt" as a wicket, despite there being a change of batsmen and the batting team losing momentum similar to when a wicket falls.

Once I did that I came up with some quite interesting numbers.

Wickets DownWinsLosesWinning %
0411869.5%
1744860.7%
2525150.5%
3113623.4%
451033.3%
5030%

It's fairly clear here that losing wickets early hurts the probability of winning. This is not really a surprise, often teams bat their best batsmen at the top, and the subsequent batsmen have to take fewer risks if there are not many wickets left above them. However while there are a lot of incidents of teams losing 1 or 2 wickets, our sample size is quite small for the other number of wickets. I've graphed it, adding in a 95% confidence interval. This indicates what range we can expect the actual winning probability to lie in per wicket loss: The shorter the line, the more reliable the data.



We can clearly see the trend here. But we also notice the huge gap between being 2 down and being 3 down. There does seem to be a difference between losing 2 wickets or losing more than 2 wickets.

Accordingly I broke it down into 3 groups. Less than 2 wickets, 2 wickets or More than 2 wickets. Here's how that looks:


Roughly teams win two thirds of the matches where they lose less than 2 wickets, half of the matches where they lose two wickets and about a quarter of the matches where they lose more than 2 wickets.

I also broke it down further by team, and this holds true for almost every team. The only team that has won more than half of their matches when batting first and losing more than 2 wickets in the power play is Ireland. (Interestingly Ireland has the 4th best winning record of any team batting first, and then they are not far behind Pakistan, Sri Lanka and South Africa).

Sri Lanka win just under 80% of t20's when they lose 2 or less wickets in the power play, but 20% when they lose 2 or more wickets. England win just over 60% if they keep their wickets in hand, but only 20% when they lose 3 or more in the power play.

With the World T20 getting underway, how the teams approach the first 6 overs could be a fascinating thing to keep an eye on.