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CB-WP-0033: a game is the unit
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make trials reported "positions unreachable: 4, target 0 — the recording
exists but the position moved". All four were false. A recording holds one
hash, the final state, and reachability asked whether the note's hash was
in that file — so a mid-game note could never match, and a post-game note
from any but the last game could not either. Instance 8 of the ADR-0018
family: vary only WHEN a note was written and the answer flips, with
nothing having moved.

The root cause was not the metric. play again reused state belonging to a
game: it overwrote the previous game's recording (data loss), never
cleared the journal (game 2's log opened with game 1's commands), and so a
note's command index pointed into a recording without those commands.
Fixing reachability alone would have gone green while a session still
destroyed its own evidence.

A note now binds by (game, after) — an index into the recording's own
commands list, which a reader can replay to. The hash keeps a job as the
integrity check at the end of a game, where it can actually fail. Game 1
keeps the path it was given, so GameDesign §5's documented invocation is
unchanged; later games get -2, -3 and nothing is overwritten. Legacy
5-column logs stay readable and are reported as legacy, never as orphans —
an unsubstantiated orphan claim is the defect being fixed.

All three fixes mutation-proven, including at the call site via a real
two-game session.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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tegwick 2026-08-07 17:41:11 +02:00
parent 4ddff3b17c
commit edab11c0e4
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scenario: ground/cb-play-session
description: recorded by cb-play (CB-WP-0008 T02)
covers: []
provisional: false
provisional_owner: ''
provisional_raised: ''
ruled: ''
ruled_by: ''
ruled_note: ''
encodes_u_item: ''
seed: 1
setup:
players: 3
preset: standard-3p
patch: {}
commands:
- actor: P1
cmd: select_action
args:
action: INVESTIGATE
problem: 2
- actor: P2
cmd: select_action
args:
action: SOLVE
problem: 1
- actor: P3
cmd: select_action
args:
action: SOLVE
problem: 1
- actor: SYSTEM
cmd: reveal
args: {}
- actor: SYSTEM
cmd: resolve
args: {}
- actor: SYSTEM
cmd: end_round
args: {}
- actor: P1
cmd: select_action
args:
action: INVESTIGATE
problem: 3
- actor: P2
cmd: select_action
args:
action: INVESTIGATE
problem: 3
- actor: P3
cmd: select_action
args:
action: INVESTIGATE
problem: 3
- actor: SYSTEM
cmd: reveal
args: {}
- actor: SYSTEM
cmd: resolve
args: {}
- actor: SYSTEM
cmd: end_round
args: {}
- actor: P1
cmd: select_action
args:
action: SOLVE
problem: 3
- actor: P2
cmd: select_action
args:
action: INVESTIGATE
problem: 4
- actor: P3
cmd: select_action
args:
action: SOLVE
problem: 2
- actor: SYSTEM
cmd: reveal
args: {}
- actor: SYSTEM
cmd: resolve
args: {}
- actor: SYSTEM
cmd: end_round
args: {}
- actor: P1
cmd: select_action
args:
action: SUPPORT
target: P2
- actor: P2
cmd: select_action
args:
action: SUPPORT
target: P1
- actor: P3
cmd: select_action
args:
action: SOLVE
problem: 4
- actor: SYSTEM
cmd: reveal
args: {}
- actor: P1
cmd: respond_to_support
args:
response: accept_bond
- actor: P2
cmd: respond_to_support
args:
response: accept_bond
- actor: SYSTEM
cmd: resolve
args: {}
- actor: SYSTEM
cmd: end_round
args: {}
- actor: P1
cmd: select_action
args:
action: SUPPORT
target: P3
- actor: P2
cmd: select_action
args:
action: SUPPORT
target: P1
- actor: P3
cmd: select_action
args:
action: SUPPORT
target: P1
- actor: SYSTEM
cmd: reveal
args: {}
- actor: P3
cmd: respond_to_support
args:
response: accept_bond
- actor: SYSTEM
cmd: resolve
args: {}
- actor: SYSTEM
cmd: end_round
args: {}
expect:
events: []
state: {}
rejects: []
state_hash: 8ade38824ca4853ac51fa8156673098ab2975a92b0db75783b0cd68a267ec30e