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Re: Rational Japanese territory via Maas-style encore?

Posted: Mon Aug 21, 2023 8:45 pm
by hzamir
jann wrote:A few things I forgot to say at the time - whether to areafy with "pass stone / penalty" or "board play reward" like Maas:

Pass stones do not directly compensate cleanup moves, but via the opponent's pass (if he doesn't respond on board). This needs an arbitrary rule about equal moves in encore. The reward method also needs extra rule though, about prisoner-pair creation (if none remains to play from) or an alternative way of reward.

Giving a prisoner for a pass distorts the concept of passing. Normally a pass is a "do nothing" or "no (score) change" thing, like a 0 point environmental coupon - ensuring players are never forced to decrease their own score. Rewarding board plays is closer to how area actually works and differ from territory (+1 pt for each played stone).

On the other hand, pass stones are also suitable for whole-game areafication, not just for encores.
While not exactly identical to playing moves with prisoners, mechanically, the pass stones are superior, and it seems close enough. What started as a query on my part about the Maas encore is now entirely vested in the mechanism of Ikeda Territory rules II (though not necessarily whole--Superko rule seems not essential?)

Equal moves doesn't seem arbitrary to me in any respect, and there ancient texts suggest it was a an early principle of the game. And I disagree about the "distortion". If you believe there is no advantage to move, and the game is at an end, you are paying a stone you should get back. If you cannot benefit from a move, and your opponent still can, well that's just kind of tough, but eminently fair.

Re: Rational Japanese territory via Maas-style encore?

Posted: Tue Aug 22, 2023 11:09 pm
by jann
hzamir wrote:not necessarily whole--Superko rule seems not essential?
Generally, area cannot (directly) use simple ko, territory cannot (directly) use superko. So area encores need some ko fix, to avoid prisoner-unbalanced area repetition breaking the territory-area coherence again. Not necessarily superko, can also be a prisoner-aware long cycle rule / Chinese ko, or Spight-style stop.
no advantage to move, and the game is at an end, you are paying a stone you should get back
Under territory scoring, the whole point of passing is to avoid playing into territory - which would hurt you for the very same cost as the pass stone. Like equal moves which is not a thing in the main game, this is yet another extra change (even if the practical effects of the reward method are similar).

Btw moves don't always run out at the same time, and on some Asian servers formal passes are only used in those rarer cases (otherwise just "offer count"). Though this doesn't really matter since encores are not adopted in practice anyway.