diff --git a/index.html b/index.html
index 89f2a32..28adabf 100644
--- a/index.html
+++ b/index.html
@@ -406,6 +406,10 @@
 
     <script>
         const RESOURCES = ["capital", "luxuries", "steel", "brass", "electrum", "trade_goods", "express"];
+        // Electrum is the one resource the solver tracks in tenths (it takes
+        // fractional amounts); its log tables are therefore sampled per tenth.
+        // Must match ELECTRUM_SCALE in solve.py.
+        const ELECTRUM_SCALE = 10;
         const SCORE_KEYS = RESOURCES.concat(["renown"]);
         const CITY_TYPES = ["hub", "foundry", "monument", "metropolis"];
         const ACTIONS = ["idle", "collect", "renovate", "upgrade", "launch"];
@@ -777,7 +781,7 @@
             card._get = () => {
                 const o = {resource: res.value, scalar: +scalar.value};
                 if (turn.value !== "") o.turn = +turn.value;
-                if (isLog.checked) o.log_mapping = buildLogTable(expr.value);
+                if (isLog.checked) o.log_mapping = buildLogTable(expr.value, res.value);
                 return o;
             };
             const resF = field("Resource", res); resF.classList.add("linear-only");
@@ -797,9 +801,12 @@
                 addTerm({resource, scalar}));
         }
 
-        // Eval the expression ONCE into a function, then call it over the amounts
-        // the lookup table needs (0..max_resource).
-        function buildLogTable(exprStr) {
+        // Eval the expression ONCE into a function, then sample it over the
+        // amounts the lookup table needs (0..max_resource). The solver indexes the
+        // table by the resource's internal amount, so Electrum (tracked in tenths)
+        // is sampled per tenth -- entry k is the score at k/ELECTRUM_SCALE -- while
+        // every other resource gets one entry per whole unit.
+        function buildLogTable(exprStr, resource) {
             let fn;
             try {
                 fn = eval(exprStr);
@@ -809,9 +816,10 @@
             if (typeof fn !== "function")
                 throw new Error("Log expression must eval to a function, got " + typeof fn);
             const max = +document.getElementById("max_resource").value || 0;
+            const scale = resource === "electrum" ? ELECTRUM_SCALE : 1;
             const table = [];
-            for (let x = 0; x <= max; x++) {
-                const v = Number(fn(x));
+            for (let i = 0; i <= max * scale; i++) {
+                const v = Number(fn(i / scale));
                 table.push(Number.isFinite(v) ? v : 0);
             }
             return table;
diff --git a/solve.py b/solve.py
index 2c081bc..c7d1a32 100644
--- a/solve.py
+++ b/solve.py
@@ -96,6 +96,14 @@ RESOURCES = [
 # values so the CP-SAT objective stays integral.
 OBJ_SCALE = 1000
 
+# Electrum is the one stockpiled resource that takes fractional amounts (the
+# Provisioner's +1.5/Turn, "awful" 2.5-each Trade Good buys, etc.). CP-SAT only
+# holds integers, so the Electrum pool is tracked internally in *tenths*: a
+# stored value of 25 means 2.5 Electrum. Every Electrum amount entering the
+# model is multiplied by this scale, and every Electrum amount read back out is
+# divided by it. All other resources stay 1:1 integers.
+ELECTRUM_SCALE = 10
+
 # Upper bound used to bound resource accumulators (and AddElement domains in
 # log mode). Override via Problem.max_resource if your game runs hotter.
 DEFAULT_MAX_RESOURCE = 300
@@ -311,6 +319,12 @@ class ScoreTerm:
     ``resource`` is a stockpiled resource name or "renown". Because per-Turn
     Renown is not tracked, a "renown" term must target the final Turn
     (``turn is None``).
+
+    For a log term, ``log_mapping`` is indexed by the resource amount in its own
+    internal units. That is one entry per whole unit for every resource except
+    Electrum, which is tracked in tenths (see ELECTRUM_SCALE): an Electrum table
+    must be sampled per tenth, so ``log_mapping[k]`` is the score at
+    ``k / ELECTRUM_SCALE`` Electrum (the web UI builds it this way).
     """
     resource: str
     scalar: float = 1.0
@@ -1062,6 +1076,9 @@ class _Builder:
                 picked_level = self._gate_expr(vat[r][t], pick[r])
                 gain_base = picked_level + self._mul_bool(harv, pick[r], 1)
                 gain_total = gain_base + self._mul_bool(gain_base, ow, self.MAXR)
+                # Vats hold whole units; the Electrum pool is tracked in tenths.
+                if r == "electrum":
+                    gain_total = ELECTRUM_SCALE * gain_total
                 self._add_delta(r, t, gain_total)
 
             # transition to next turn's vat levels
@@ -1134,7 +1151,9 @@ class _Builder:
             for r in targets:
                 c = m.NewIntVar(0, self.MAXR, f"tgconv_{r}_t{t}")
                 self.trade_conv[(r, t)] = c
-                self._add_delta(r, t, c)            # +1 target resource
+                # 1 Trade Good -> 1 target unit; Electrum is stored in tenths.
+                gain = ELECTRUM_SCALE * c if r == "electrum" else c
+                self._add_delta(r, t, gain)            # +1 target resource
                 self._add_delta("trade_goods", t, -c)  # -1 Trade Good
 
     def _build_conversions(self):
@@ -1158,15 +1177,22 @@ class _Builder:
             if dst not in RESOURCES:
                 raise ValueError(f"conversion 'to' unknown resource: {dst!r}")
             amount = c.get("amount")
-            from_amt = int(round(c.get("from_amount", amount if amount is not None else 0)))
-            to_amt = int(round(c.get("to_amount", amount if amount is not None else from_amt)))
+            raw_from = c.get("from_amount", amount if amount is not None else 0)
+            raw_to = c.get("to_amount", amount if amount is not None else raw_from)
+            # Electrum is tracked in tenths, so its amounts keep one decimal of
+            # precision; every other resource stays an integer.
+            from_scale = ELECTRUM_SCALE if src == "electrum" else 1
+            to_scale = ELECTRUM_SCALE if dst == "electrum" else 1
+            from_amt = int(round(raw_from * from_scale))
+            to_amt = int(round(raw_to * to_scale))
             if from_amt < 0 or to_amt < 0:
                 raise ValueError("conversion amounts must be non-negative")
             self._add_delta(src, t, -from_amt)
             self._add_delta(dst, t, to_amt)
             self.conversions.append({
                 "turn": t, "from": src, "to": dst,
-                "from_amount": from_amt, "to_amount": to_amt,
+                "from_amount": from_amt / from_scale if from_scale != 1 else from_amt,
+                "to_amount": to_amt / to_scale if to_scale != 1 else to_amt,
             })
 
     def _build_optional_conversions(self):
@@ -1194,8 +1220,14 @@ class _Builder:
             if dst not in RESOURCES:
                 raise ValueError(f"optional conversion 'to' unknown resource: {dst!r}")
             amount = c.get("amount")
-            from_amt = int(round(c.get("from_amount", amount if amount is not None else 0)))
-            to_amt = int(round(c.get("to_amount", amount if amount is not None else from_amt)))
+            raw_from = c.get("from_amount", amount if amount is not None else 0)
+            raw_to = c.get("to_amount", amount if amount is not None else raw_from)
+            # Electrum is tracked in tenths, so its amounts keep one decimal of
+            # precision; every other resource stays an integer.
+            from_scale = ELECTRUM_SCALE if src == "electrum" else 1
+            to_scale = ELECTRUM_SCALE if dst == "electrum" else 1
+            from_amt = int(round(raw_from * from_scale))
+            to_amt = int(round(raw_to * to_scale))
             if from_amt < 0 or to_amt < 0:
                 raise ValueError("optional conversion amounts must be non-negative")
             max_count = int(c.get("max_count", 1))
@@ -1206,7 +1238,9 @@ class _Builder:
             self._add_delta(dst, t, to_amt * n)
             meta = {
                 "turn": t, "from": src, "to": dst,
-                "from_amount": from_amt, "to_amount": to_amt, "max_count": max_count,
+                "from_amount": from_amt / from_scale if from_scale != 1 else from_amt,
+                "to_amount": to_amt / to_scale if to_scale != 1 else to_amt,
+                "max_count": max_count,
             }
             self.optional_conversions.append(meta)
             self._opt_conv_vars.append((meta, n))
@@ -1242,16 +1276,18 @@ class _Builder:
                     m.Add(first >= gov_any[t] - ever_before)
                 for r, amt in a.onetime_governor_bonus.items():
                     if r in RESOURCES and amt:
-                        self._add_delta(r, t, amt * first)
+                        scaled_amt = amt * ELECTRUM_SCALE if r == "electrum" else amt
+                        self._add_delta(r, t, scaled_amt * first)
 
     def _build_resource_balance(self):
         m = self.m
         T = self.T
         for r in RESOURCES:
-            start = int(round(self.p.start.get(r, 0)))
+            scale = ELECTRUM_SCALE if r == "electrum" else 1
+            start = int(round(self.p.start.get(r, 0) * scale))
             self.res[r] = []
             for t in range(T):
-                v = m.NewIntVar(0, self.MAXR, f"res_{r}_t{t}")
+                v = m.NewIntVar(0, self.MAXR * scale, f"res_{r}_t{t}")
                 self.res[r].append(v)
                 prev = self.res[r][t - 1] if t > 0 else start
                 deltas = self.delta.get((r, t), [])
@@ -1262,40 +1298,39 @@ class _Builder:
         """Provisioner: +1.5 Electrum each Turn it governs a City.
 
         Electrum is never spent in this model (only accumulated for scoring),
-        so the bonus is layered on top of the integer Electrum pool as an
-        ``electrum_eff[t]`` amount used by scoring and constraints. The gain is
-        tracked in half-units (1.5 = 3 half-units); a partial trailing 0.5 from
-        an odd number of governing Turns is floored."""
+        so the bonus is layered on top of the Electrum pool as an
+        ``electrum_eff[t]`` amount used by scoring and constraints. Both the
+        pool and this overlay are in tenths (see ELECTRUM_SCALE), so the 1.5
+        gain is an exact 15-tenths integer with no rounding. ``governor_
+        electrum_half`` is in half-units (1 half = 0.5 = 5 tenths)."""
         m = self.m
         T = self.T
         ncities = len(self.p.cities)
-        # default: no Provisioner effect, effective Electrum == the pool.
+        # default: no Provisioner effect, effective Electrum == the pool (tenths).
         self.electrum_eff = list(self.res["electrum"])
-        half_terms = {t: [] for t in range(T)}
-        any_half = False
+        tenth_terms = {t: [] for t in range(T)}
+        any_tenths = False
         for ai, a in enumerate(self.p.agents):
             if not a.governor_electrum_half:
                 continue
             for ci in range(ncities):
                 for t in range(T):
                     if (ai, ci, t) in self.gov:
-                        half_terms[t].append(
-                            a.governor_electrum_half * self.gov[(ai, ci, t)])
-                        any_half = True
-        if not any_half:
+                        tenth_terms[t].append(
+                            a.governor_electrum_half * 5 * self.gov[(ai, ci, t)])
+                        any_tenths = True
+        if not any_tenths:
             return
-        per_turn_max = sum(a.governor_electrum_half for a in self.p.agents)
-        bound = per_turn_max * T + 2
+        per_turn_max = sum(a.governor_electrum_half for a in self.p.agents) * 5
+        bound = per_turn_max * T
         eff = []
         cum_prev = 0
         for t in range(T):
-            cum = m.NewIntVar(0, bound, f"elechalf_cum_t{t}")
-            m.Add(cum == cum_prev + sum(half_terms[t]))
+            cum = m.NewIntVar(0, bound, f"electenth_cum_t{t}")
+            m.Add(cum == cum_prev + sum(tenth_terms[t]))
             cum_prev = cum
-            half = m.NewIntVar(0, bound, f"elechalf_t{t}")
-            m.AddDivisionEquality(half, cum, 2)
-            e = m.NewIntVar(0, self.MAXR + bound, f"electrum_eff_t{t}")
-            m.Add(e == self.res["electrum"][t] + half)
+            e = m.NewIntVar(0, self.MAXR * ELECTRUM_SCALE + bound, f"electrum_eff_t{t}")
+            m.Add(e == self.res["electrum"][t] + cum)
             eff.append(e)
         self.electrum_eff = eff
 
@@ -1341,7 +1376,9 @@ class _Builder:
             if op not in self._OPS:
                 raise ValueError(f"resource_constraints op must be one of {self._OPS}")
             var = self._resource_at(c["resource"], c.get("turn"))
-            value = int(c["value"])
+            # Electrum is compared in tenths; its bound may carry a decimal.
+            scale = ELECTRUM_SCALE if c["resource"] == "electrum" else 1
+            value = int(round(float(c["value"]) * scale))
             if op == ">=":
                 m.Add(var >= value)
             elif op == "<=":
@@ -1369,11 +1406,24 @@ class _Builder:
             if not term.scalar:
                 continue
             amt_var = self._resource_at(term.resource, term.turn)
+            # Electrum's amount var is in tenths; the table/scalar are stated per
+            # whole Electrum, so account for the scale on the way into the score.
+            is_elec = term.resource == "electrum"
             if term.log_mapping is None:
-                terms.append(scaled(term.scalar) * amt_var)
+                if is_elec:
+                    # scalar * (amt/ELECTRUM_SCALE), kept integral via OBJ_SCALE.
+                    coeff = int(round(term.scalar * OBJ_SCALE / ELECTRUM_SCALE))
+                    terms.append(coeff * amt_var)
+                else:
+                    terms.append(scaled(term.scalar) * amt_var)
             else:
                 table = term.log_mapping
                 # value = table[min(amt, len-1)]; scale table values to ints.
+                # The table is indexed in the resource's own internal units, so
+                # ``amt_var`` indexes it directly: whole units for most resources,
+                # but tenths for Electrum (see ELECTRUM_SCALE) -- callers must
+                # therefore supply an Electrum table sampled per tenth (entry k is
+                # the score at k/ELECTRUM_SCALE Electrum), which the UI does.
                 vals = [scaled(v) for v in table]
                 tag = f"{term.resource}_t{term.turn if term.turn is not None else T - 1}"
                 idx = m.NewIntVar(0, len(table) - 1, f"idx_{tag}")
@@ -1511,7 +1561,9 @@ def _extract(problem: Problem, b: _Builder, solver, status_name: str) -> Solutio
                 for expr in b.city_delta.get((ci, r, t), []):
                     total += expr if isinstance(expr, int) else solver.Value(expr)
                 if total:
-                    deltas[r] = float(total)
+                    # Electrum deltas are accumulated in tenths.
+                    deltas[r] = (float(total) / ELECTRUM_SCALE
+                                 if r == "electrum" else float(total))
             for r, amt in extra.get((ci, t), {}).items():
                 deltas[r] = deltas.get(r, 0.0) + amt
                 if deltas[r] == 0:
@@ -1522,8 +1574,12 @@ def _extract(problem: Problem, b: _Builder, solver, status_name: str) -> Solutio
                 deltas=deltas,
             ))
 
+    def _unscale(r, raw):
+        # The Electrum pool is stored in tenths; everything else is 1:1.
+        return float(raw) / ELECTRUM_SCALE if r == "electrum" else float(raw)
+
     final_resources = {
-        r: float(solver.Value(b.final_amt[r])) for r in RESOURCES
+        r: _unscale(r, solver.Value(b.final_amt[r])) for r in RESOURCES
     }
     conversions = []
     for (r, t), var in sorted(b.trade_conv.items(), key=lambda kv: (kv[0][1], kv[0][0])):
@@ -1543,14 +1599,17 @@ def _extract(problem: Problem, b: _Builder, solver, status_name: str) -> Solutio
     for t in range(T):
         row = {"turn": t}
         for r in RESOURCES:
-            row[r] = float(solver.Value(b._resource_at(r, t)))
+            row[r] = _unscale(r, solver.Value(b._resource_at(r, t)))
         resources_by_turn.append(row)
     return Solution(
         status=status_name,
         objective_value=solver.ObjectiveValue() / OBJ_SCALE,
         final_resources=final_resources,
         final_renown_total=int(solver.Value(b.renown_total)),
-        start_resources={r: float(int(round(problem.start.get(r, 0)))) for r in RESOURCES},
+        start_resources={
+            r: (round(problem.start.get(r, 0) * ELECTRUM_SCALE) / ELECTRUM_SCALE
+                if r == "electrum" else float(int(round(problem.start.get(r, 0)))))
+            for r in RESOURCES},
         plan=sorted(plan, key=lambda p: (p.turn, p.city)),
         trade_conversions=conversions,
         forced_conversions=list(b.conversions),