Even with the latest reasonably full description of his methodical approach as per the 1988 Mackeson analysis, there are arbitrary aspects - top three on consistency/ability, three from highest class lto races etc - to VDW which trouble me as they invite the question why three (or indeed any specific number)?
In working examples through the prism of the 1988 Mackeson approach, it occurred to me that one could use VDW's components without arbitrary "rules" and what I now see as unnecessary "refinements" by going back to his original formula - Consistent Form + Ability + Capbility + Probability + Hard Work = Winners.
Leaving aside hard work, what do we know about the other four?
Consistent form. VDW gave "rules" but what did he do in practice? The very large majority of his selections had single figure consistency totals, those with 10 or more being (a) a small minority and (b) with a reasonably obvious reason for leaving a high individual component of the three to one side (examples include Love From Verona, Crown Matrimonial and Gaye Chance).
Ability. Some of VDW's examples were top on his ability rating, but others were not. There may be others but the only example I have noted so far as NOT in the top six on the ability rating was Kings Ride (of whom more later).
Capability. My assumption is this comprised the "other factors" in his "the balance between class, form and the other factors" formulation, and over the years he gave examples of unsuitable distance, going, weight and course type.
Probability. I take to be position in the forecast, the first five/six producing a high percentage of winners.
Re-ordering these to focus initially on those which are - from VDW's perspective - intrinsic to the individual horse - it is possible to work though a field until one isolates the class/form horse as per the re-worked 1988 Mackeson in the four attachments.
In the first, the only working column filled is Ability, which arguably VDW saw as the most important, and one obviously sorts by his ability rating, high to low, so from Townley Stone to Giolla Padraig. (I have opted to colour the top six green, not because any horse lower in the ranking could under no circumstances be the class/form horse, but to indicate it would be unusual. From a VDW viewpoint it would mean there were at least six other runners with greater ability and although none may be form horses there is obviously a chance the one or more may return to form and win.
In the second screenshot I have also filled the Form column, a simple yes or no applying VDW's form status rating approach. (All his selections from 1978 to 1980 were "form" horses.) This excludes four of the top six on ability, leaving Jim Thorpe as the highest ability-rated form horse, ahead of Pegwell Bay and three others.
In the third screenshot I have filled the Capability column as far as necessary. From the examples it looks as though VDW took things on trust where there was no contrary evidence - eg horses running over previously untried distances - and only disqualified a horse where to his mind there was clearly contrary evidence. Jim Thorpe in the 1988 Mackeson being a case in point.
In the fourth screenshot I have added the two considerations I now think of contextual - Consistency and Probability. I have coloured single-figure consistency totals green as we know from a VDW standpoint we are on safe ground. Ditto the first six in the forecast (I don't have any data for NH handicaps but for Flat ones with 12 and 16 runners about 85% of winners come from the first six in the returned betting and it is reasonable to think that a broadly similar figure would come from the Post's forecasts). Happily, Pegwell Bay gets green lights on both - he has a low single-figure consistency total and is in the first six of the forecast. If he failed to get a green on either, in my view that would not be a disqualifier - merely something one would need to consider when deciding whether or not to back him.
So, a solid class/form horse though not what VDW sometimes described as a "racing certainty" as he faced four competitiors who, although disqualified on either form or capability, were in principle of greater ability and one of them making good could not be completely disregarded. Nevertheless, undertandable that VDW backed him.
I am still checking VDW examples but the above simplifying and re-ordering of his 1988 Mackeson example seems to me to have three advantages. First, it achieves the same answers. Second, it avoids the more obviously arbitrary aspects of his way of working. Third, assuming one has the right databases, it is quick and efficient.
re Kings Ride, he was very low down the ability ranking table. The question is, was he a VDW selection (ie what he saw as the class/form horse in the race) or mentioned to draw attention to the force of consistency and being in the first six of the forecast? I'm inclined to the latter view.