In a season as unpredictable as 2017 has been, you have to be pleased when your head-to-head tipsters average 6.4 from 9 and your margin predictors produce an average mean absolute error (MAE) of 24.8 points per game.

This week it's the Lions v Giants game that's expected to crack the 200 total according to all four forecasters, with the Giants projected to score about 60% of that total.

The first three games of the heavily-abridged Round 13 look too close to call this week, which has made for some of the highest levels of Head-to-Head Tipster disagreement we've seen this season.

According to MoSSBODS and MoSHBODS, Port Adelaide didn't do enough in defeating the Brisbane Lions by 40 points and 10 Scoring Shots over the weekend, and so shed Rating Points (RPs) on both Systems. As a result, they slipped to 3rd on Combined Ratings.

Only three of the round's six favourites were successful this week, and none of the MoS Head-to-Head Tipsters did better than BKB's score of three.

MoSSBODS and MoSHBODS both think we'll see over 200 points in Saturday's Port Adelaide v Brisbane Lions game, though they differ in the proportions of those points that they expect the two teams to record.

The first three games of the heavily-abridged Round 13 look too close to call this week, which has made for some of the highest levels of Head-to-Head Tipster disagreement we've seen this season.

To state the stunningly obvious, 2017 has been a year where form has dominated class, in which context Port Adelaide's 70-point loss to Essendon, and GWS' narrow loss to Carlton should come as little surprise.

Six home teams but only three mid-week TAB favourites won their Round 12 games, which has catapulted last-season's spoon-winning Home Sweet Home a tip clear of Bookie Knows Best.

MoSSBODS and MoSHBODS have very similar opinions about the likely Totals in all seven of this week's games, differing by no more than three points in any of them.

Doubtless there are good financial reasons for it, but the commencement of bye rounds on Thursday nights has always seemed a bit odd to me. All the moreseo this week where we also have the traditional June long-weekend Monday fixture, which means that the round's seven games are to be sprinkled across five different days.

Port Adelaide regained top ranking on MoSSBODS and MoSHBODS this weekend after a 51 point and 21 scoring shot victory over the Hawks. It's now rated an 0.3 scoring shot better team than Adelaide at a neutral venue according to MoSSBODS, and a 1 point better team than Adelaide at a neutral venue according to MoSHBODS.

If you'd offered me, on Thursday afternoon, a 3.4 from 6 average for the Head-to-Head Tipsters and a sub 21 all-Predictor mean absolute error (MAE) for the Margin Predictors I'm fairly certain I'd have signed for it.

This week, MoSSBODS and MoSHBODS disagree by more than 3 points about the Total in any single game only for the Cats v Crows contest, which MoSHBODS assesses a 205-point game and MoSSBODS a 200-point game.

For those of us who love the 9-game form of the AFL round, the 6-game version seems like football's T20. (And, yeah, I'm going to leave that analogy alone now because I don't think it'll carry me very far).

Adelaide did more than enough this week to convince both MoSSBODS and MoSHBODS that it was the most deserving #1 team, a position previously held by Port Adelaide on both Systems.

In a season that's been as delightfully unpredictable as this one, I think you have to nod and sagely accept a round where your best Head-to-Head Tipster (Consult The Ladder) bags 8 from 9 and your average Tipster manages 7.

This week, the two MoS and the two bookmakers all expect the average game to produce about 182 points, though they get to that average by different routes.

There are very high levels of agreement amongst the Head-to-Head Tipsters this week, with the only underdog forecasts coming from MoSSBODS and, of all things, C_Marg in their selections of Port Adelaide and GWS, from Consult The Ladder also in its selection of GWS, and from Home Sweet Home in its selection of Carlton. The other 75 tips are all for favourites.

Adelaide, according to MoSSBODS and MoSHBODS, didn't do quite enough in their victory over the Lions to reclaim the number 1 spot, which has now been held by Port Adelaide for the past two weeks.