Archive for the ‘AI Series’ Category

Mayo v Roscommon 2017 AI QF

July 31, 2017

For those new to the blog, or who haven’t been here for a while, please find a refresher on the definitions and how the numbers are compiled here

Team Possessions Attacks Shots Scores Exp Pts
Roscommon 56 43 24 2 – 09 13.23
Mayo 54 42 29 1 – 12 14.46

Both teams had similar possession volumes (56 for Roscommon to Mayo’s 54) as well as Attack Rates (77% v 78%). Once inside the 45 there was a divergence however with Mayo getting more shots off (29 to Roscommon’s 25).

As an aside 110 possessions is high but not inordinately so. Across 54 games in 2015 and 2016 I have eight with a higher possession total including the 2015 final between Kerry & Dublin which was played in similarly wet conditions. The Connacht game ths year between Mayo & Galway had 113.

Mayo attack

As ever we start with Cillian O’Connor. One of his less auspicious days with a total Conversion Rate of 27% (0 – 03 from 11; Expt Pts – 2.91) and just 14% from play (0 – 01 from 7; Expt Pts -1.94). In eight games in 2016 he returned a combined conversion rate of 62% (0 – 44 from 71) with an Expt Pts tally of -0.93.

As ever his appetite for work and willingness to offer himself up as an option were evident as he took four of Mayo’s last six shots (Durcan took the other two) from the 65th minute onwards. One of these shots was a free from well outside his range whilst the other three were central enough however two were taken under strong or intense pressure. Indeed five of his seven attempts from play were heavily pressurised. If you’re Mayo you probably want O’Connor on the ball at the death but the opposition are well aware of this.

In a down game for O’Connor Lee Keegan almost single-handedly dragged Mayo back from the abyss scoring 1 – 03 from just five shots (80% Conversion Rate; Expt Pts +3.25). The goal was a prime example of split second decision making that can win/lose/decide games.

In the above Keegan’s (5) marker Enda Smith (9) gets sucked into the kickout melee unaware that Doherty has claimed a mark. Keegan sees it and immediately sets off behind Smith’s back. McDermott (Roscommon defender pointing) sees the danger but it is too late. Keegan is gone with nothing but open road in front of him.

The remainder of the Mayo team were average scoring 0 – 06 from 13 (46% Conversion Rate; Expt Pts of +0.10). None of the starting trio of McLoughlin, A O’Shea or S O’Shea managed a shot whilst only Tom Parsons produced one off the bench. Mayo will definitely be looking for more of a threat here the next day.

On McLoughlin & A O’Shea the fact that they didn’t get a shot off does not necessarily mean they had a poor game. Both were very involved higher up the pitch as evidenced by the assist chart.

Roscommon’s defence may be slightly disappointed in the fact that 46% (11 of 24) of Mayo’s shots were taken under little or no pressure however on the flip side they will be delighted in where they forced Mayo to shoot from. Mayo never really got through them or around the side – the vast majority of shots were from “outside”.

Roscommon attack

At a macro level Roscommon’s shooting was very good with them scoring ~1.7 points more than the shots they attempted would normally return. But their Conversion Rate was essentially average at 46% and therein lies a problem. Their high returns from goal attempts (2 – 00 from 2) masks how poor their shooting in general was. They had 16 point attempts from play and returned just 0 – 05 (31% Conversion Rate; Expt Pts -2.42).

It is quite possible, in a one off game in the replay, that they will again create more goal chances than Mayo and convert them all. It is much more likely however that they will revert to the mean on their goal attempt conversions and thus they will have to rely more heavily on the point taking (be that from play of from frees).

One point to note here is the affect that Mayo’s defence had on Roscommon. Above we showed how Roscommon helped themselves by keeping Mayo, in the main, on the outer perimeter. Roscommon got inside Mayo more often (see shot chart below) but the Mayo defense deserves credit as they heavily pressurised 75% (12 of 16) of Roscommon’s point attempts. This included a ~35 minute period post the second goal where they heavily pressurised 8 of Roscommon’s next 10 point attempts leading to Roscommon returns of 10% Conversion Rate (0 – 01 from 10) with a combined Expt Pts of -3.31.

Now undoubtedly there was “scoreboard pressure” as Mayo overturned the 7 point deficit that led to poor decisions and execution in the shots but Mayo definitely aided those poor decisions.

75% heavy pressure is high and at times they walked a bit of a tightrope offering up six attempts from a free with four coming inside the 45 – but you’ll take a combined return of 41% ( 0 – 09 from 22) from all point attempts.


Very even all told. 20 kickouts went passed the 45 with both teams winning 10 each. As with the general trend mentioned above Mayo were better at converting those possessions to shots.

In an interview post the Cork game Rochford mentioned, in assessing A O’Shea’s impact, how he had aided smaller things such as winning the throw in. Here Roscommon not only won both throw ins but scored off both as well.

Roscommon’s shot chart

Mayo’s shot chart

x = missed, disc = score, yellow = deadball, black = 1st half from play, white = 2nd half, red = goal attempt