Forum for 200 Endgame Problems - Winning Tactics
The Value of Moves [#2923]
: The Value of Moves
(2019-02-10 20:10) [#9835]
Moved from the errata page as not a real erratum.
The text for this diagram indicates that is worth 10 points, but because white a is not sente, I think it is only worth 8 points.
Bill: The normal assumption is that White cannot afford to make ko if Black hanes, leaving the next diagram as sente for Black.
The follow-up is a 5 pt. sente, which means that the original capture is ambiguous between sente and gote. (If you consider it a gote it gains 5 pts., so its deiri value is indeed 10 pts.)
Shaydwyrm: When I woke up this morning I realized my mistake, only to find you had already fixed it! The ambiguity adds a little subtlety to the position that I would not have thought of.