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One generator, so a citation names one fight (R-265)

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tools/playthrough.mjs exists to show a reader why a measured number is what it is. I cited
it to another session — read seed 2, see the wipe the 45% row is made of — and the
reproduction failed in front of them. They reported different outcomes at both seeds and
guessed the cause correctly from outside: the two tools were not drawing from the same
stream.

They were not. simulate.mjs used a private mulberry32 makeRng; playthrough.mjs had its own
LCG written to look like it. Both deterministic, both reproducible alone, and "seed 2"
named a different fight in each — which breaks the only thing the tool is for. Its own
comment claimed a seed here names the same fight there. check-focus carried a third copy of
that LCG, so the two guards described the same game with different dice.

makeRng is exported and both files use it. A playthrough seed is now exactly the first
fight of simulate.mjs --seed <n>: --runs 1 --seed 2 and the playthrough give 9 rounds, 4 of
4 down, 1 dead, both.

The other half was my citation rather than the code: the command I sent omitted --mode, so
it plays both targeting arms and prints two fights. They read the last line, I quoted the
first. The summary line now names the arm.

check-focus re-recorded under the shared stream; figures move a point or two. What it buys
is that the bimodality analysis now reproduces the published means exactly — 2.31, 3.03,
0.40, 0.42 against the four rows CLEAN GROUND publishes. Under the old LCG it agreed to
within a decimal, which looked like corroboration and was two experiments landing near each
other.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
slaguru666
2026-09-13 01:11:41 +01:00
co-authored by Claude Opus 5
parent 796bb7df73
commit 8627fa3536
8 changed files with 201 additions and 146 deletions
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tools/simulate.mjs
+5 -1
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@@ -98,7 +98,11 @@ export function seedFor(base, key = "") {
}
/** mulberry32 — small, fast, and seedable, which is the only property that matters. */
function makeRng(seed) {
/* R-265. Exported because anything that cites a measured fight has to draw from the same
stream to name the same fight. tools/playthrough.mjs had its own LCG, so "seed 2" meant
one fight there and a different one here, which quietly broke the only thing that tool
exists for. */
export function makeRng(seed) {
let a = seed >>> 0;
return () => {
a = (a + 0x6D2B79F5) >>> 0;