Ballard himself has chosen door #1: that it's a pairing system, but I find this wildly implausible. Maybe the system has some implications for swiss system pairings (for example, maybe last round pairings should not match players with the same scores, but set things up so that, where possible, those with White have one point more than their opponents), but it won't have any effect on the pairings for a round-robin event. As far as I can tell, the only effect BAP has on the world of round-robin tournaments is that all such tournaments probably need to have an even number of rounds. Nevertheless, this doesn't make BAP a pairing system, so I think we can reject this thesis.
On the other hand, Jon Jacobs has insisted, in various comments both on this blog and elsewhere, that using BAP produces something that isn't chess as we know it, but a variant. Why? I don't think Jacobs is as clear as he could be, but the essential idea is that the rules of the game have changed because the fundamental goal structure of the game has changed. Traditionally, the primary goal is to win; secondarily, it's not to lose. But as a White draw nets him the same goose egg (no points) a loss achieves, the secondary goal has been (largely?) eliminated when one has White.
I find this account more plausible than Ballard's, but I'm not fully persuaded - there's more work for Jacobs to do. First, we should distinguish between different sorts of rules. A couple of weeks ago, I exchanged a few emails with another chess teacher on USCF's recent decision to mandate recording one's moves only after playing them. My interlocutor thought it was a terrible idea while I was somewhat in its favor, but neither of us thought our dispute was over two forms of chess. USCF did make a change to the rules of the game, broadly construed, but it's what we might call a nonessential change, not an essential change.
It's worth saying a little more about this, as the distinction between the essential and the non-essential is crucial here. A property is essential to a thing if, if a thing loses that property, it ceases to be that thing; that is, it ceases to exist. An example or two might help. It's an essential property of a sphere that, for any two points on its surface, each point is equidistant from the center of the sphere. Should something happen to the object to mar its surface, it ceases to exist as a sphere. (It could continue to exist as a hunk of marble, as a decorative object, etc.) Or suppose we think it's an essential property of a human being, that he have self-consciousness. What this would mean, if true, is that a sleeping human is in fact not a human being at all! Unless one wants to bite the bullet and claim that (non-REM) sleepers are corpses of a special sort, it would be better to rescind this alleged essential property.
Let's contrast this with non-essential properties. When I cut my fingernails, I've undergone a change, but it's not one that affects my essential nature. If I was a human being before, merely changing the length of my fingernails doesn't change that. On the other hand, if I'm flattened by a steamroller, a la good old Warner Brothers cartoons, then I'm not a really short human being; I'm an ex-human being. Or rather, physically speaking, I'm not, period - I've ceased to exist as an embodied human being.
Back to chess: the dispute over when one can record the moves is clearly non-essential: it was chess before the rule change, and it's still chess after the rule change. So not all rule changes affect the essential properties of the game, but others do. If kings start moving like kings in checkers, we've clearly created a variant of the game; it's not longer chess-as-we-know-it.
The really tough question, then, is what the essential rules of the game are, such that if any of them are changed, we're talking about a variant and not the "normal" version. One possibility, which might be Jacobs' view - but it need not be - is this: the essential, non-negotiable rules include the following:
1. The rules for moving the pieces (including captures, castling, en passant and pawn promotion).
2. The rules for checkmate, stalemate and other drawing scenarios.
3. The goal-rules: a win is worth a point, a draw half a point, a loss nothing.
This is a plausible list, and probably at least very close to what we'd all say if asked by relatives to give a 5-10 minute summary of the rules. But there are difficulties under all three headings.
Ad 1: All of these have changed over the years, and castling, pawn promotion and en passant (together with the pawn's double move) in particular are relative newcomers on the scene. Each rule made for a big change, but was it an essential change?
Ad 2: Checkmate is an absolutely ancient part of the game, but stalemate isn't. More to the point, the drawing rules have been in great flux within my lifetime: there have been the Sofia rules and other attempts to delay/deny draws by agreement, but there have been other changes as well. One short-lived change was the revocation of the 50-move rule for certain endings (e.g. 2 Bs vs. N) when computers proved wins taking more than 50 moves to achieve. So rules of type 2 are more flexible than we might initially think.
Ad 3: There have been changes here too, over the years, though the current point system goes back to at least 1867. (That might sound relatively recent, but with London 1851 generally considered the first international event, it's really not.) Yet there are exceptions to this system even in our time. What were the scores of the Karpov-Korchnoi world championship matches? No one says "16.5-15.5 and 11-7, Karpov" but 6-5 and 6-2, Karpov. Karpov-Kasparov I was terminated when the score was 5-3, not 25-23.
So maybe we need to revise the essential heart of our scoring system, and I think this can be done in a way that extends the tradition even before 1851. Here's the revision: a win by either side counts, equally, for a point apiece (but what about the Spassky-Portisch candidates' match? - that's at least a mini-problem), while a draw (a) counts for less than a win, and (b) intrinsically favors neither player. There have been objections to (b) over the years (based largely on anti-stalemate sentiments), but it is a pretty stable tradition.
Is (b) essential? Here's a little argument to suggest that it may not be. The conditions given might be seen as one way of expressing something still more fundamental ideas at the heart of the draw: first, the need to handle non-decisive results; second, to do so in a way that facilitates the overall event. The goal of the game is to win, but that's not always possible. So what do we do? Ideally, replay the games or otherwise disregard the draw in pursuit of decisive results. That was true in London 1851 and New York 1857, and more recently in various candidates' and world championship matches.
Unfortunately, this can easily generate logistics problems, though (recall once more K-K I), so the half-point solution was an economical way to address the two fundamental ideas of the last paragraph. It's a nice way to handle everything, and one that takes into account the near-parity of White and Black. If there's another way to satisfy the fundamental ideas, though, then why not? Why won't it still be chess?
Note that this stops short of endorsing BAP: to suggest that Jacobs' argument at the very least needs supplementation and at worst fails doesn't show that just anything goes. I could continue, but I think this is enough for tonight, and I'll allow Jacobs and others to pick up the ball and run with it where they will.
Related Posts (on one page):
- Is BAP Chess = Chess?
- The"BAP" System Revisited: A Prelude
