coulomb/clay-borg
4
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

H2's ATTACK dynamics, and a construction hazard found while measuring them
Some checks failed
ci / check (push) Failing after 3s
Details

Browse source 
The H2 panel measured wins, variance and DARVO but not ATTACK selection —
which is F17's actual question. attack-value now runs H2 too.

The shape is the finding. Under H1 a seat that sometimes attacks loses
everything at 3p and above. Under H2 rank-75 wins 112/173/199 against
greedy's 120/175/199, while attacking and arming DARVO. So H2 makes
occasional ATTACK affordable — it does not make it pay. rank-75 never
beats greedy in any cell, and rank-95 (always attack) still wins 0
everywhere in all three variants, so "not always-attack-optimal" holds.

F17 therefore stands: ATTACK earns its place in no mode. What changed is
that choosing it is no longer catastrophic. Whether affordable is what the
design wants is ground-game's judgement.

And a hazard: with_variant() exists because H2 assigns Problem owners at
setup and `state.variant = v` leaves them unassigned, so scoped pressure
ticks nobody and H2 measures as INERT. Three call sites had the bare
write, including cb-play's driver.

No published figure is affected, and that was checked rather than assumed:
h2-panel used the builder, and the two harnesses with the bare write had
only ever run baseline and H1, neither of which has a setup step; the
driver has never played H2. All three fixed, and
a_bare_variant_write_leaves_h2_inert now states the difference so a
regression is caught by a named test rather than by a reader wondering why
H2 did nothing.

The builder was not enough — the field is public, so the old form still
compiles. Worth knowing before the next variant.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
tegwick 2026-08-08 16:56:27 +02:00
parent d3c2dc1375
commit 47e7941057
7 changed files with 409 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

52
evidence/CB-EV-0032-h2-measured.md
View file

@ -96,7 +96,57 @@ the best evidence in this file: **the scoping is what saves it**, not any
other difference between the packages. Their optional A/B was worth
running.
## 5. What this does not say
## 5. ATTACK — affordable under H2, still not profitable
Added after the first report, because the H2 panel measured wins, variance
and DARVO and **not ATTACK selection**, which is F17's actual question.
`attack-value`'s rank-75 policy — *attack when convenient* — SHARED
GROUND, wins with attacks and DARVO arms in brackets:
| seats | baseline | H1 | H2 |
|---|---|---|---|
| 2p | 132 (604 atk, 81 arms) | 66 (180, 59) | **65 (248, 102)** |
| 3p | 165 (592, 125) | **0** (0, 0) | **112 (250, 52)** |
| 4p | 190 (923, 218) | **0** (0, 0) | **173 (626, 165)** |
| 6p | 200 (389, 31) | **0** (0, 0) | **199 (299, 45)** |
**The shape is the finding.** Under H1 a seat that sometimes attacks loses
everything at 3p and above. Under H2 it wins **112 / 173 / 199** — against
greedy's 120 / 175 / 199 — *while* attacking and arming DARVO.
> **H2 makes occasional ATTACK affordable. It does not make it pay.**
rank-75 never beats greedy in any cell; at best it draws level (199 vs 199
at 6p). And **rank-95 — always attack — still wins 0 everywhere**, in all
three variants, so the *"not always-attack-optimal"* property holds.
**F17 therefore stands.** ATTACK earns its place in no mode; what changed
is that choosing it is no longer catastrophic. Whether "affordable" is
what the design wants, or whether ATTACK should actually reward, is
ground-game's judgement.
## 6. A construction hazard, found while measuring this
`GroundState::with_variant()` exists because H2 assigns Problem owners at
setup and `state.variant = v` leaves them unassigned — **scoped pressure
then ticks nobody and H2 measures as inert**.
**Three call sites had the bare write**, including `cb-play`'s driver.
**No published figure is affected**, and that was checked rather than
assumed: `h2-panel.rs` used the builder, and the two harnesses with the
bare write had only ever run baseline and H1, neither of which has a
setup step. The driver has never played H2.
All three are fixed, and `a_bare_variant_write_leaves_h2_inert` now states
the difference — so a regression is caught by a named test rather than by
a reader wondering why H2 did nothing.
**The builder was not enough**: the field is public, so the old form still
compiles. That is worth knowing before the next variant.
## 7. What this does not say
- **No felt-play.** H2's central claim is about *motivation* — a bonded
pair caring about each other's card — and §3 says as much. 200-game

7
games/ground/examples/attack-value.rs
View file

@ -120,7 +120,8 @@ fn sweep(
st.mode = mode;
// CB-WP-0038 T03: the SAME instrument measures both rule sets in
// the same run. Two harnesses would compare harnesses.
st.variant = variant;
// `with_variant`, never a field write (see regulation.rs).
let st = st.with_variant(variant);
let mut ps = mk(players);
// CB-WP-0038 T03: a game the engine REFUSES is not a game the
// table lost, and `else { continue }` made the two identical.
@ -211,6 +212,10 @@ fn main() {
"H1 h1-problem-stress",
games_ground::Variant::H1ProblemStress,
),
(
"H2 h2-scoped-problem-stress",
games_ground::Variant::H2ScopedProblemStress,
),
] {
println!("================ {vlabel} ================\n");
for (label, mode) in [

5
games/ground/examples/regulation.rs
View file

@ -133,7 +133,10 @@ fn sweep(mode: ScoringMode, variant: Variant, players: u8, reactive: bool) -> Ce
continue;
};
st.mode = mode;
st.variant = variant;
// `with_variant`, never a field write: H2 assigns Problem
// owners at setup, and the bare write leaves them unassigned —
// scoped pressure then ticks nobody and H2 measures as inert.
let st = st.with_variant(variant);
// The dealt state, kept so the peak metric can read the real
// starting Stress rather than trust a constant.
let started = st.clone();

54
games/ground/src/lib.rs
View file

@ -2288,6 +2288,60 @@ mod tests {
}
}
/// **The hazard `with_variant` exists for, made visible.**
///
/// Setting `state.variant = H2` directly compiles and produces a
/// game where **no Problem has a scope**, so scoped pressure ticks
/// nobody and H2 measures as inert — a silently wrong result, not
/// a failure.
///
/// Three call sites had the bare write when this was found, one of
/// them the driver. This test states the difference so a
/// regression is caught by a name rather than by a puzzled reader
/// wondering why H2 did nothing.
#[test]
fn a_bare_variant_write_leaves_h2_inert() {
let base = GroundState::setup(
&Setup {
players: 4,
preset: "standard-4p".into(),
patch: Default::default(),
},
5,
)
.expect("setup");
// The wrong way.
let mut bare = base.clone();
bare.variant = Variant::H2ScopedProblemStress;
assert!(
bare.problems.values().all(|p| p.scope.is_none()),
"a bare write should leave scopes unassigned — if it does not, \
`with_variant` is no longer load-bearing and this test is stale"
);
assert!(
!bare
.end_round_events()
.iter()
.any(|e| matches!(e, GroundEvent::StressSet { .. })),
"a bare-write H2 produced pressure, so the hazard has changed shape"
);
// The right way.
let built = base.with_variant(Variant::H2ScopedProblemStress);
assert!(
built.problems.values().all(|p| p.scope.is_some()),
"`with_variant` did not assign scopes"
);
assert!(
built
.end_round_events()
.iter()
.any(|e| matches!(e, GroundEvent::StressSet { .. })),
"`with_variant` H2 produced no pressure with Problems unclaimed"
);
}
/// **The baseline is untouched by H2's new state** (T02).
///
/// `owner` and `scope` are new fields on `ProblemState`. Both are

5
tools/cb-play/src/table.rs
View file

@ -408,7 +408,10 @@ fn run_game<'a, R: BufRead + 'a, W: Write + 'a>(
initial.mode = config.mode;
// CB-WP-0038: set beside `mode` and before the hash, so a recorded
// session replays under the variant it was played under.
initial.variant = config.variant;
// `with_variant`, never a field write: H2 assigns Problem owners at
// setup, and the bare write would leave them unassigned — a silently
// wrong game rather than a failing one.
let initial = initial.with_variant(config.variant);
let initial_json = serde_json::to_value(&initial).map_err(|e| e.to_string())?;
let initial_hash = cb_events::state_hash_hex(&initial);

141
trials/2026-08-08-1648-2.yaml Normal file
View file

@ -0,0 +1,141 @@
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: 2
setup:
players: 3
preset: standard-3p
patch: {}
commands:
- actor: P1
cmd: select_action
args:
action: SOLVE
problem: 1
- 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: 2
- actor: P2
cmd: select_action
args:
action: INVESTIGATE
problem: 2
- actor: P3
cmd: select_action
args:
action: INVESTIGATE
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: INVESTIGATE
problem: 3
- actor: P2
cmd: select_action
args:
action: SOLVE
problem: 2
- 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: INVESTIGATE
problem: 4
- actor: P2
cmd: select_action
args:
action: INVESTIGATE
problem: 4
- actor: P3
cmd: select_action
args:
action: INVESTIGATE
problem: 4
- 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: SOLVE
problem: 4
- actor: P3
cmd: select_action
args:
action: SOLVE
problem: 4
- actor: SYSTEM
cmd: reveal
args: {}
- actor: SYSTEM
cmd: resolve
args: {}
- actor: SYSTEM
cmd: end_round
args: {}
expect:
events: []
state: {}
rejects: []
state_hash: 71b243fdd585e678b6876a6bd8aec74f2490438db5ce852c8d0320f24550070f

149
trials/2026-08-08-1648.yaml Normal file
View file

@ -0,0 +1,149 @@
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: SUPPORT
target: P2
- 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: 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: INVESTIGATE
problem: 4
- 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: SOLVE
problem: 3
- actor: P2
cmd: select_action
args:
action: SOLVE
problem: 3
- actor: P3
cmd: select_action
args:
action: SOLVE
problem: 4
- 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: 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: b15834bdf1b30ef0e3d84bdba10395d0fa4efd16086d24b59a6080d08b1804f2