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Board surfaces

Dark brown:
The environment for the discussion of the current move sequence is the era of Fujisawa Hideyuki 9p.

Brown:
The environment for the discussion of the current move sequence is the era of other professional players.

Light brown:
"Neutral" environment / general "analysis room" for the discussion of the current move sequence.

Darker yellow:
The environment for the discussion of the current move sequence is the era of amateur players.

Golden:
The environment for the discussion of the current move sequence is the era of KataGo.

Yellow (with red lines):
Prohibited board point for KataGo.

Move enclosures

(Used even if not played in the original order of moves.)

Dark brown:
This move originates from Fujisawa Hideyuki, according to the chronological development of our knowledge.

Brown:
This move originates from another professional player, according to the chronological development of our knowledge.

Yellow:
This move originates from an amateur player, according to the chronological development of our knowledge.

Orange:
This move originates from KataGo, according to the chronological development of our knowledge.

Green frame:
Correct move.

Red frame:
Mistake.

Yellow frame:
Technical mistake.

Cyan frame:
Manually enforced (during KataGo analysis).

Board edges

Brown:
Eight Main Semeai Liberties.
Under certain cirumstances (depending on the number of territory reducing moves Black has to play to get a satisfactory score in the Capture Variation), White must be careful to not lose a single tempo in the Main Semeai, and so might be restricted in her movements on the baord.

Dark red:
Seven Main Semeai Liberties.
Black is bound to follow the Main Semeai, as he must not lose a single tempo in the Main Semeai. Black can play outside the Main Semeai area, only if White did so just before.

Dark grey:
Six Main Semeai Liberties (maximum).
Black has fallen below the Punishment Semeai Liberty Level. White will choose the Capture Variation, capturing not only the hanezeki's tail, but also Black's large group in the upper right.

Pink:
Nine Main Semeai Liberties.
Under certain circumstances (and still nine Main Semeai Liberties at White's decision point), White might fall prey to Joachim's Final Ko in the Semeai Variation.

Light grey:
Ten Main Semeai Liberties (minimum).
Under certain circumstances (and still nine Main Semeai Liberties at White's decision point), White might fall prey to Joachim's Final Ko in the Semeai Variation.
If Black still has ten Main Semeai Liberties at White's decision point, Black's large group in the upper right will survive the Semeai Variation, resulting in White losing the game by a very large margin.

Cyan:
Analysis mode. Special restrictions apply (e.g. a ban on giving atari at Black groups, or capturing Black groups that are in atari).

Light brown:
Capture Variation.

Dark brown:
Semeai Variation.