3p Null Hat Guessing Conventions

# 3p Null Hat Guessing Conventions | # mod 8| action | person clued | type | card |--------|---------------------------------|----------------|--------| ---- | 0 (8) | discard chop | 1 player away | number | not the expected fill-in | 1 (9) | play 1 | 1 player away | number | fill-in | 2 (10) | chop move once then discard | 1 player away | color | fill-in | 3 (11) | play 3 | 1 player away | color | not the expected fill-in | 4 (12) | play 4 | 2 players away | color | fill-in | 5 (13) | play 5 | 2 players away | color | not the expected fill-in | 6 (14) | chop move twice then discard | 2 players away | number | not the expected fill-in | 7 (15) | chop move thrice then give clue | 2 players away | number | fill-in ## Fill-in clues The expected fill-in clue is to: 1. Touch the leftmost clued card that will become fully-identified. 2. If there are no cards to fill in, reclue the leftmost already clued card. 3. If there are no clued cards, clue slot 1. It is possible that all of the above options are unavailable and a fill-in clue is impossible. It is possible that a "not the expected fill-in" clue is unavailable. Players must consider these cases. ## Chop A player's chop (next discard) is defined as (ignoring *Chop Ignored* cards): 1. The rightmost card that is not chop moved. Note this may be a clued card. 2. If all of the cards are chop moved, then the least recently chop moved card, breaking ties with rightmost. ## Chop moves Whenever you chop move a card, write a note that says what turn the clue that caused the chop move was given. Now your least recently chop moved is the card which has a chop move note with the lowest turn number. Note that it is possible to chop move a card that has already been chop moved. When this happens you should update the note to have the current turn number. This happens when someone's hand is locked and they receive a chop move instruction. _Example_: turn 19: Alice has a clued blue card in slot 3. No blue cards are played. Alice has a clued red card in slot 5. Red 1 is played, and the clued card could be a r1. turn 20: Alice receives a chop move thrice and give clue instruction, turn 21: chop move thrice and give clue instruction. Alice makes the following notes. slot 3: t19: [cm] (Known useful at the end of turn 19) slot 5, 4, 2: t20: [cm] (clue at turn 20) slot 1, 3, 5: t21: [cm] (clue at turn 21) Alice's new chop is slot 4. ## *Chop Ignored* cards A card is *Chop Ignored*, meaning that it can never be the target of a chop move/discard instruction if any of the following apply: - It is clued as a 5 - It is fully known - It is a known trash (either by being targeted from a previous discard instruction or just by global empathy) - It is a known play ## Known useful cards After interpreting each clue or after erasing your notes for a bomb, if any clued cards are known useful, chop move them for free. This does not apply to unclued cards, because that's easier to miss and not generally applicable in Null. A card is considered known useful when it is clued and none of the possibilities seen in the global empathy have been played/given a play instruction. Note that if a card could be a dupe of a another clued card, but cannot have already been played, it's still considered known useful and should get chop moved once. Later if that player gets locked we can tell them to discard it. ## Playing slot 2 If you want to instruct a player to play slot 2 and they have a card that is known not to be playable from empathy, is fully known, is known trash, or is already given a play instruction, then instruct them to play the rightmost such card. If you are instructed to play the rightmost slot in your hand that is not playable from empathy, play slot 2. If the first responder plays slot 2, the last responder can figure out which slot in their hand is the rightmost that is not playable from empathy and act as though they played that slot for determining their instruction. ## Last responder instruction priority Instructions assigned to the last responder must respect this priority: 1. Play the leftmost playable card, skipping slot 2 unless they hold a known unplayable with which to clue slot 2. 2. Chop move as many useful cards as possible, then discard chop if their new chop would be trash. 3. Chop move thrice and give clue. The last responder cannot be instructed to discard a useful card unless the other copy is in their hand. The last responder cannot be instructed to chop move a card which they have another copy of in hand, unless they are being instructed to discard the other copy in the same clue. If the last responder has two copies of a useful card in hand and it would be possible to instruct them to discard either without chop moving trash, use the following set of priorities to determine which copy to discard: 1. Discard such that the remaining copy is clued. 2. Discard such that the remaining copy is chop moved. 3. Discard the leftmost copy. ## Hands with 3 or more Chop Ignored cards When a player has only two cards in hand that are not *Chop Ignored*, both `chop move twice and discard` and `chop move thrice and give clue` mean the same thing. In such situations, if you don't want that player to discard a chop moved card, then they always be assigned `chop move thrice and give clue`. ## Resetting after a strike After a strike that is not positional or a critical discard, all notes are erased for the purposes of clue interpretation, so that the team can get back in sync. If a player was chop moved prior to the strike and never receives a clue about their chop, they may discard the card that would have been on chop if they kept their chop move notes. After this discard, the team can restore their chop move notes for that player and everybody knows where their chop is since they just discarded it. ## Elimination The last responder must write hard elimination notes if they discard a copy of an yet to be played card. Elimination notes do not affect clue interpretation, with one exception below. They are not treated as fully known or chop moved and must be instructed to play if they are the priority. ## Elimination & Finesses If a player with a hard elimination note becomes the first responder to a clue, they must consider the possibility of a finesse. For this to be true, - The first responder must have a hard elimination note - The next card in sequence must be the top priority play in the last responder's hand ## Competition Play & Positional discards & bombs The expected discard order of known trash is as follows: 1. Discard the most recently instructed non-obvious trash. 2. Discard obvious trash right-to-left. If a card is discarded out of order, then either that player has misinterpreted a clue and does not know about some trash, or it's a positional discard for that slot. If a player bombs the card that they were expected to discard, that promises one playable card on the matching slot. If a player bombs known trash that they were not expected to discard, that promises two playable cards on the matching slot. At 8 clues, bombs call for 1 fewer blind-play. ## Choosing to discard known usefuls/known playables When a player discards a known playable or discards a known useful instead of discarding known trash, it promises that the card is the leftmost matching clued card in someone else's hand, or if that's impossible, then it's on finesse position. When a player discards a known useful card that is not playable in order to unlock themselves, it does not promise the location of the other copy, or even that the other copy is present.

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