Forum for Flying Saucer Shape

Path: <= Shape Collection =>

Criticality of the liberties of the middle stones [#62]

Unkx80: Criticality of the liberties of the middle stones (2005-10-12 19:21) [#135]

For the case when both white+circle stones are present:

If the black+circle stones have no outside liberties, it implies that the white+square points must be occupied.

We already know that this group is dead.

Conversely, if any of the critical white+square stones are not present, then the black+circle stones must have a liberty at a.

We already know that this group is unsettled.

Thus, the liberties of the middle stones is not critical.

Path: <= Shape Collection =>

Forum for Flying Saucer Shape