Re: [gnugo-devel] owl attack moves and semeais

[Paul Pogonyshev]

Arend wrote:
> IMO, we should always apply the following logic when deciding whether a
> stone is alive (assuming, for simplicity, it's the opponent to move next):
> 
> - if it's tactically capturable => dead
> - otherwise, if owl alive => alive
> - otherwise, if there is a single semeai that this dragon can win => alive
> - otherwise, dead
> 
> [Corollary: reading code may never claim successful attack when in fact it
> is not, but is allowed to claim no attack when in fact there is; owl may
> never claim life when the dragon is in fact dead.]

Seems logical.

> This patch tries to apply this logic for owl attack moves: If the attacked
> dragon is involved in a semeai, we have to check whether it can win the
> semeai after the owl attack move has been played. If not, we only award
> a strategical attack move reason.

I assume regression results (with node counters) are on the way, right?

Paul