Zendo, play by forum

[Proxima]

Don't be silly, it doesn't carry over like that 

[Ramon]

You are enlightened!

A koan is white iff it becomes a palindrome after forgetting the differences among the 25 non-I letters.

You provided the perfect black starting koan, the round looped back to it nicely.

[kaywhyn]

Don't be silly, it doesn't carry over like that 

I hardly think it's silly when I'm being nice and allowing you to have a turn first because you previously decided to pass on being the rulemaster from guessing my rule correctly Especially if you have a good rule However, since you're fine with me taking my turn, I'll go ahead and take it, so thanks

Anyway, new round!

White koans:
  LIGHT

Black koans:
  BRIGHT
 

[Simon]

RIGHT
BLIGHT
IGHT
LLLLL

-- Simon

[kaywhyn]

White koans:
  LIGHT
* LLLLL
* RIGHT

Black koans:
* BLIGHT
  BRIGHT
* IGHT

[WillLem]

AKHTBN iff it's first letter is alphabetically later than (or equal to) the letter "L"

[kaywhyn]

Counterexample: PLIGHT. In this case, P comes later than L in the alphabet but PLIGHT is black, not white.

White koans:
  LIGHT
  LLLLL
  RIGHT

Black koans:
  BLIGHT
  BRIGHT
  IGHT
* PLIGHT

[Silken Healer]

GHT
HT
T
LIGH
LIG
LI
L
BRIGH
BRIG
BRI
BR
B
BITE
MIGHT
NIGHT
QUITE
FIGHT
WHITE
BRIGHT
FRIGHT
SPITE
FLIGHT
TIGHT
SIGHT
SPRITE
KITE
SLIGHT
MIDNIGHT
IGNITE
ALRIGHT
DESPITE
TONIGHT
INVITE
POLITE
DAYLIGHT
RECITE
SPOTLIGHT
DELIGHT
DYNAMITE
METEORITE

[kaywhyn]

White koans:
* ALRIGHT  * HT       RIGHT
* BR       * LI     * SIGHT
* BRI      * LIG    * SPITE
* BRIGH      LIGHT  * TIGHT
* DELIGHT    LLLLL  * TONIGHT
* DESPITE  * MIGHT  * WHITE
* FIGHT    * NIGHT
* GHT      * QUITE

Black koans:
* B         * FRIGHT     * MIDNIGHT
* BITE        IGHT         PLIGHT
  BLIGHT    * IGNITE     * POLITE
* BRIG      * INVITE     * RECITE
  BRIGHT    * KITE       * SLIGHT
* DAYLIGHT  * L          * SPOTLIGHT
* DYNAMITE  * LIGH       * SPRITE
* FLIGHT    * METEORITE  * T

...
WHITE
BRIGHT
FRIGHT
...

BRIGHT is an initial black koan, it happened to be in your list of 40 guesses for some reason

[Silken Healer]

BRIGHT is an initial black koan, it happened to be in your list of 40 guesses for some reason 

Because I just copied it from a list of rhymes for light quickly without checking each one and if there was a duplicate you could just manually not re-add it to the list of koans

[Silken Healer]

AKHTBN iff it's length is a prime number