diff --git a/lib/lua/scoreboard.json b/lib/lua/scoreboard.json
new file mode 100644
index 00000000..cd886261
--- /dev/null
+++ b/lib/lua/scoreboard.json
@@ -0,0 +1,171 @@
+{
+  "totals": {
+    "pass": 0,
+    "fail": 16,
+    "timeout": 0,
+    "skip": 8,
+    "total": 24,
+    "runnable": 16,
+    "pass_rate": 0.0
+  },
+  "top_failure_modes": [
+    [
+      "parse error",
+      14
+    ],
+    [
+      "undefined symbol: print\\",
+      1
+    ],
+    [
+      "transpile: unsupported node",
+      1
+    ]
+  ],
+  "results": [
+    {
+      "name": "all.lua",
+      "status": "skip",
+      "reason": "driver uses dofile to chain other tests",
+      "ms": 0
+    },
+    {
+      "name": "api.lua",
+      "status": "skip",
+      "reason": "requires testC (C debug library)",
+      "ms": 0
+    },
+    {
+      "name": "attrib.lua",
+      "status": "fail",
+      "reason": "parse error",
+      "ms": 3243
+    },
+    {
+      "name": "big.lua",
+      "status": "fail",
+      "reason": "undefined symbol: print\\",
+      "ms": 4383
+    },
+    {
+      "name": "calls.lua",
+      "status": "fail",
+      "reason": "parse error",
+      "ms": 3565
+    },
+    {
+      "name": "checktable.lua",
+      "status": "skip",
+      "reason": "internal debug helpers",
+      "ms": 0
+    },
+    {
+      "name": "closure.lua",
+      "status": "fail",
+      "reason": "parse error",
+      "ms": 3465
+    },
+    {
+      "name": "code.lua",
+      "status": "skip",
+      "reason": "bytecode inspection via debug library",
+      "ms": 0
+    },
+    {
+      "name": "constructs.lua",
+      "status": "fail",
+      "reason": "parse error",
+      "ms": 2522
+    },
+    {
+      "name": "db.lua",
+      "status": "skip",
+      "reason": "debug library",
+      "ms": 0
+    },
+    {
+      "name": "errors.lua",
+      "status": "fail",
+      "reason": "parse error",
+      "ms": 2371
+    },
+    {
+      "name": "events.lua",
+      "status": "fail",
+      "reason": "parse error",
+      "ms": 5133
+    },
+    {
+      "name": "files.lua",
+      "status": "skip",
+      "reason": "io library",
+      "ms": 0
+    },
+    {
+      "name": "gc.lua",
+      "status": "skip",
+      "reason": "collectgarbage / finalisers",
+      "ms": 0
+    },
+    {
+      "name": "literals.lua",
+      "status": "fail",
+      "reason": "parse error",
+      "ms": 1434
+    },
+    {
+      "name": "locals.lua",
+      "status": "fail",
+      "reason": "parse error",
+      "ms": 1386
+    },
+    {
+      "name": "main.lua",
+      "status": "skip",
+      "reason": "standalone interpreter driver",
+      "ms": 0
+    },
+    {
+      "name": "math.lua",
+      "status": "fail",
+      "reason": "parse error",
+      "ms": 2427
+    },
+    {
+      "name": "nextvar.lua",
+      "status": "fail",
+      "reason": "parse error",
+      "ms": 4241
+    },
+    {
+      "name": "pm.lua",
+      "status": "fail",
+      "reason": "parse error",
+      "ms": 5026
+    },
+    {
+      "name": "sort.lua",
+      "status": "fail",
+      "reason": "parse error",
+      "ms": 930
+    },
+    {
+      "name": "strings.lua",
+      "status": "fail",
+      "reason": "parse error",
+      "ms": 3424
+    },
+    {
+      "name": "vararg.lua",
+      "status": "fail",
+      "reason": "transpile: unsupported node",
+      "ms": 1931
+    },
+    {
+      "name": "verybig.lua",
+      "status": "fail",
+      "reason": "parse error",
+      "ms": 450
+    }
+  ]
+}
\ No newline at end of file
diff --git a/lib/lua/scoreboard.md b/lib/lua/scoreboard.md
new file mode 100644
index 00000000..a8f5f486
--- /dev/null
+++ b/lib/lua/scoreboard.md
@@ -0,0 +1,39 @@
+# Lua-on-SX conformance scoreboard
+
+**Pass rate:** 0/16 runnable (0.0%)
+fail=16 timeout=0 skip=8 total=24
+
+## Top failure modes
+
+- **14x** parse error
+- **1x** undefined symbol: print\
+- **1x** transpile: unsupported node
+
+## Per-test results
+
+| Test | Status | Reason | ms |
+|---|---|---|---:|
+| all.lua | skip | driver uses dofile to chain other tests | 0 |
+| api.lua | skip | requires testC (C debug library) | 0 |
+| attrib.lua | fail | parse error | 3243 |
+| big.lua | fail | undefined symbol: print\ | 4383 |
+| calls.lua | fail | parse error | 3565 |
+| checktable.lua | skip | internal debug helpers | 0 |
+| closure.lua | fail | parse error | 3465 |
+| code.lua | skip | bytecode inspection via debug library | 0 |
+| constructs.lua | fail | parse error | 2522 |
+| db.lua | skip | debug library | 0 |
+| errors.lua | fail | parse error | 2371 |
+| events.lua | fail | parse error | 5133 |
+| files.lua | skip | io library | 0 |
+| gc.lua | skip | collectgarbage / finalisers | 0 |
+| literals.lua | fail | parse error | 1434 |
+| locals.lua | fail | parse error | 1386 |
+| main.lua | skip | standalone interpreter driver | 0 |
+| math.lua | fail | parse error | 2427 |
+| nextvar.lua | fail | parse error | 4241 |
+| pm.lua | fail | parse error | 5026 |
+| sort.lua | fail | parse error | 930 |
+| strings.lua | fail | parse error | 3424 |
+| vararg.lua | fail | transpile: unsupported node | 1931 |
+| verybig.lua | fail | parse error | 450 |
diff --git a/plans/lua-on-sx.md b/plans/lua-on-sx.md
index e83a7731..06ac655e 100644
--- a/plans/lua-on-sx.md
+++ b/plans/lua-on-sx.md
@@ -57,7 +57,7 @@ Each item: implement → tests → tick box → update progress log.
 - [x] Raw table access `t.k` / `t[k]` (no metatables yet)
 - [x] Vendor PUC-Rio 5.1.5 suite to `lib/lua/lua-tests/` (just `.lua` files)
 - [x] `lib/lua/conformance.sh` + Python runner (model on `lib/js/test262-runner.py`)
-- [ ] `scoreboard.json` + `scoreboard.md` baseline
+- [x] `scoreboard.json` + `scoreboard.md` baseline
 
 ### Phase 4 — metatables + error handling (next run)
 - [ ] Metatable dispatch: `__index`, `__newindex`, `__add`/`__sub`/…, `__eq`, `__lt`, `__call`, `__tostring`, `__len`
@@ -82,6 +82,7 @@ Each item: implement → tests → tick box → update progress log.
 
 _Newest first. Agent appends on every commit._
 
+- 2026-04-24: lua: PUC-Rio scoreboard baseline — 0/16 runnable pass (0.0%). Top modes: 14× parse error, 1× `print` undef, 1× vararg transpile. Phase 3 complete.
 - 2026-04-24: lua: conformance runner — `conformance.sh` shim + `conformance.py` (long-lived sx_server, epoch protocol, classify_error, writes scoreboard.{json,md}). 24 files classified in full run: 8 skip / 16 fail / 0 timeout.
 - 2026-04-24: lua: vendored PUC-Rio 5.1 test suite (lua5.1-tests.tar.gz from lua.org) to `lib/lua/lua-tests/` — 22 .lua files, 6304 lines; README kept for context.
 - 2026-04-24: lua: raw table access — fix `lua-set!` to use `dict-set!` (mutating), fix `lua-len` `has?`→`has-key?`, `#t` works, mutation/chained/computed-key writes + reference semantics. 224 total tests.