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IPL 2010 Final Analysis: Where it went wrong for Mumbai, and why Pollard’s effort was too late

April 2010 Aneesh No comments

The Mumbai Indians failed to chase down 169 runs to win the DLF IPL trophy. If you’re wondering where it all went wrong, you can find out here — in excruciating detail.

Fans were screaming for Pollard to come in when Nayar fell in the 12th over, as the required run rate approached two runs per ball.  But instead, a promotion for Harbhajan Singh baffled pundits and fans alike.  Mumbai continued to slip, losing Harbhajan, Tendulkar, and Tiwary in the next 3 overs.  Just five overs left, only 5 wickets in hand, and nearly 14 runs an over required — surely it’s the time to send in your most destructive batsman?  Nope, instead, we saw JP Duminy come out of the Mumbai dugout.  Kieron Pollard finally came in at No. 8, with just 3 overs left, and the game all but lost.

With some help from our friends Messers Duckworth and Lewis, we can see where exactly Mumbai slipped up.  I’ve defined a measure called “Winnability”, to measure the strength of a team’s position in the 2nd innings of a run chase.  It’s pretty simple — if the chasing team has a winnability of 100, it is at a par score, with exactly enough resources in hand to hit the target in the remaining overs.  If the winnability gets above 100, the team bowling in the second innings has the advantage.  Basically, if the game was stopped at that point, the bowling team would win by D-L.  The situation is exactly reversed with winnability below 100.  For reference, no chasing team has ever overcome a winnability of over 150 in the IPL or World Twenty20; even a winnability above 130 is quite a tough ask for the chasing team.

(Continue reading below the graph)

Winnability during the 2nd innings of the IPL 2010 Final: Mumbai Indians vs Chennai Super Kings

As you can see from the figure above, the Mumbai Indians were on the back foot from the first ball.  A slow run rate meant that the Chennai Super Kings had the advantage during the Powerplay overs.  Indeed, by the halfway point, Mumbai were facing an uphill battle, which led to desperate shots, and a desperate promotion for the Turbanator.  Wickets tumbled at a regular rate, thanks to some great fielding by Raina and Vijay.  By the end of the 16th over, winnability had crept above 150, which meant Mumbai were all but out of it.

Pollard came in at the start of the 18th over, with winnability over 190.  The game had already been decided at that point, for all practical purposes.  Even KP’s lusty blows off Doug Bollinger, 22 runs off the over in all, only brought winnability down to 167.

Here’s the bottom line: Mumbai’s slow run rate in the first ten overs put them at a serious disadvantage, and the flurry of wickets in overs 11 to 15 sealed their fate.  After that, not even the might of Kieron Pollard could save them. The match had already been lost before the big man strode to the crease.

If you want more details on the analysis, feel free to email me at aneesh (at) againstthespin.com. If you want to subscribe to future posts on Against the Spin, enter your email address below.

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IPL 2010 Semifinals: Delhi, Deccan, Chennai – “Win and you’re in”

April 2010 Aneesh 2 comments

Well folks, this is it.  The IPL has come down to these last three games: Chennai v. Punjab, Delhi v. Deccan, and Mumbai v. Kolkata.  With Mumbai & Bangalore in for sure, and Rajasthan & Punjab out for sure, 4 teams are contending for 2 spots.  There’s a good chance things could be decided today itself, with the Mumbai-Kolkata match becoming a formality.  Kolkata must win decisively to have even a chance, and after tomorrow’s games, they’ll know exactly what they need to do.  Things will revolve around the outcome of the game between CSK and the King XI Punjab, so let’s look at the scenarios.

If Chennai beat Punjab …

Chennai will go through, along with the winner of Delhi-Deccan. Kolkata have no chance

If Chennai lose to Punjab …

Chennai are definitely out, and the winner of Delhi-Deccan is definitely through. If Deccan lose to Delhi, and Kolkata beat Mumbai badly enough the next day, Kolkata could grab the fourth slot. However, if Deccan beat Delhi, then it’s likely that both Deccan & Delhi will go through, thanks to Delhi’s strong NRR.

What each team needs to do:

Delhi:  Either win, or hope Punjab beat Chennai.

Deccan: Either win, or hope that Punjab beat Chennai and Kolkata lose to Mumbai

Chennai: Win.  End of story.

Kolkata:  Hope and pray.  Both results need to go their way today (Chennai beat Punjab, and Delhi beat Deccan by a big margin), and then they have to pull off a big win of their own against the top dogs of IPL 3, the Mumbai Indians.

These IPL posts have been getting a lot of readers from Google, so I hope you folks are enjoying the statistical slant.  If you’d like to receive future posts by email (a couple posts per week), you can subscribe below.

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IPL 2010 Semifinals: Bangalore Qualify, Kolkata Nearly Out

April 2010 Aneesh 2 comments

In the past two days, Bangalore have beaten Rajasthan, virtually ensuring their qualification, and Delhi moved closer to clinching a spot by toughing it out in a low-scoring duel versus Chennai.  Only in theory is it possible for Bangalore to not make it — their net run rate is so high, with one game left to spare, that it’d take a defeat of huge proportions to push it below 0.200.  For Bangalore to fall out of the top 4, they’d need to be overtaken by Rajasthan, Deccan or Kolkata, all of which have net run rates below -0.400.  In short, that’s not happening.  Congrats, Bangalore fans, your “Test team” is through for the second straight year!

Delhi continue to do just enough to qualify.  Once comfortably situated in 2nd, they dropped three games on the trot, before beating Chennai to stay on track for the semifinals.  They’re an 87.5% chance to make it for an unprecedented third straight year.  Delhi don’t play again until the 18th, so they’ll know exactly what they need to do going into that game versus Deccan.  If Deccan beat Punjab tomorrow, and Chennai do the same on the 18th, Delhi will need to beat Deccan on the 18th.  If either of those teams loses to Punjab, then Delhi are through regardless of their result versus Deccan.

Tomorrow’s Game:

Another must-win game for Deccan, and more net practice for Punjab.  If Deccan lose, Delhi are almost certainly through, and Deccan are left to hope that Chennai & Rajasthan lose, and then they beat Delhi on the 18th.  But if Deccan win, they’ll have a 63% chance of advancing, and can clinch it on their own by beating Delhi.

There’s still a small chance (3.1%) a team can sneak into 4th place with just 12 points, but it’s far more likely (96.1%) that 14 points will be needed.  So Chennai & Rajasthan both have must-win last games.  Thankfully those games are against Punjab & Kolkata respectively, the bottom two teams in the table.  While 14 points will likely be necessary to end up in the top 4, that alone is not sufficient — it’s probable that multiple teams end up on 14 points, and fight it out over net run rate.  If a team wants to grab a semifinal spot without depending on that lottery, it needs 16 points.  Chennai and Rajasthan can’t get there, so their qualification is not in their hands alone — they can both win their last game and still find themselves sitting out.  Deccan however, have two games in hand, so if they win both, they’re through without worrying about net run rate.

Here’s the updated table (after the game on Thursday, April 15):

Team Probability of Qualifying
Change Current Points
Mumbai Indians 100.0% unch
18
Bangalore Royal Challengers 100.0% +25.6% 14
Delhi Daredevils 87.5% +4.5% 14
Chennai Superkings 53.1% +13.5% 12
Deccan Chargers 37.5% +7.5% 12
Rajasthan Royals 18.8% 31.2% 12
Kolkata Knight Riders 3.1% 19.9% 10
Kings XI Punjab 0.0% unch. 8

IPL 2010 Semifinals: It all comes down to Net Run Rate

April 2010 Aneesh 2 comments

Another update to my earlier post on the teams’ semifinal chances, based on the results of today’s game. Deccan stayed alive by beating Bangalore — they now have a 30% chance of going through, still behind Chennai’s 39.6%.  How can Deccan, with 12 points and 2 games in hand, still have less chance of qualifying than Chennai who have only 10 points, albeit with 3 games in hand?  The answer lies in net run rate.  My simulation suggests that there is a 90% chance that the 4th place team will have 14 points, and (independently) a 79% chance that the fifth place team will end up with 14 points.  That means that net run rate will most likely determine who goes through.  And Deccan are quite far behind Chennai on that metric.  Of course, they could surprise everyone (and my model) by winning their last games so decisively that their net run rate crosses Chennai’s; not likely, though.  So Deccan may well need 16 points for the semis, unless some of the other teams choke.

The good news is that 16 points will see Deccan through.  And not just Deccan.  The probability of the 5th place team having less than 16 points is 99.8% — in other words, rack up 16 points and you’re basically on your way to the semifinals.  Each team except Punjab can reach 16 points if they perform well enough over their last games. So each team still controls its own destiny: Win all the rest of your games, and a semifinal spot is (nearly) guaranteed.

Keep reading for a preview of how tomorrow’s games may affect the standings.

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Race for the IPL Semifinals: Rajasthan stutter, Mumbai seal the deal

April 2010 Aneesh 4 comments

Quick update to yesterday’s post on the teams’ semifinal chances, based on the results of today’s games.  Rajasthan are the main movers, with their loss to Mumbai bringing their qualification probability down to 49.8%.  Chennai are the beneficiaries of that move, and now have a 40.3% chance of making it through.  I also added a slightly more sophisticated way of accounting for changes in net run rate with wins/losses, so these new numbers should be more accurate.  Factoring in today’s results, its increasingly likely (86%) that 14 points will be needed to qualify for the semifinals.

Delhi’s loss to Punjab doesn’t change much for either team.  Punjab still have about a much of a chance of going forward as Chris Martin does of hitting a Test century — mathematically possible, but not even worth mentioning.  Delhi too are still in a strong position, though their chances dropped from 89% to 83%.  Even if they lose their third match on the trot to Mumbai on Tuesday, they’ll still have an over 70% chance of going through.  That’s what a strong early season and a healthy net run rate does for you.

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IPL 2010: Predicting the Semifinalists

April 2010 Aneesh No comments

The round-robin stage of the IPL is drawing to a tense conclusion.  While Mumbai are almost certainly in, and Punjab are almost certainly out, the fate of the other six teams is very much up in the air.  There are 13 games left to play, and a number of possible outcomes.  So, I ran a simulation that calculates all 8192 ways the last 13 games could finish up (assuming no ties), and assessed each team’s position in each of those 8192 cases, breaking ties on the current net run rate.  Without further ado, here are the results:

Team Probability of Qualifying
Current Points
Mumbai Indians 99.0% 14
Delhi Daredevils 89.4% 12
Bangalore Royal Challengers 83.5% 12
Rajasthan Royals 64.7% 12
Chennai Superkings 31.6% 10
Kolkata Knight Riders 17.9% 10
Deccan Chargers 13.8% 10
Kings XI Punjab 0.0% 6

Rajasthan, despite being level with Bangalore on points, are less assured of going through, thanks to a weak net run rate (NRR).  Meanwhile, a strong net run rate could see Chennai through if they can gain a game on Rajasthan.  The following chart shows the number of points that will be needed to qualify for the semifinals.

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