Couple of EFG format fixes

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "draw_tree"
-version = "0.9.0"
+version = "0.9.1"
 description = "Game tree drawing tool for extensive form games"
 readme = "README.md"
 requires-python = ">=3.10"

src/draw_tree/__init__.py

@@ -5,7 +5,7 @@
 from extensive form (.ef) files, with support for Jupyter notebooks.
 """
 
-__version__ = "0.9.0"
+__version__ = "0.9.1"
 
 from .core import (
     draw_tree,

src/draw_tree/converter.py

@@ -328,13 +328,18 @@ def _extract_action_label(move: str) -> str:
     1. **Tilde-separated** (generated by ``gambit_layout_to_ef``):
        ``H~(\\frac{1}{2})`` → ``H``
     2. **Raw label** (hand-written EF):
-       ``\\frac{1}{3}`` → ``\\frac{1}{3}``
+       ``\\frac{1}{3}`` → ``1/3``
     """
     if not move:
         return ""
     # Split off chance probability annotation (tilde form)
     parts = move.split("~", 1)
-    return parts[0]
+    label = parts[0]
+    m = _FRAC_RE.match(label)
+    if m:
+        sign = m.group(1)
+        return f"{sign}{m.group(2)}/{m.group(3)}"
+    return label
 
 
 def _extract_chance_prob(move: str) -> str:
@@ -592,15 +597,15 @@ def _node_line(
     # Terminal nodes
     if iset is None:
         return "t %s %s" % (
-            _q(n.nodeid),
+            _q(""),
             _outcome_tail(n, outcome_num, n_players, zero_sum_expand),
         )
 
     first = id(iset) not in emitted_iset
 
     if iset.player == 0:
         # Chance node
-        head = "c %s %d" % (_q(n.nodeid), iset.id)
+        head = "c %s %d" % (_q(""), iset.id)
         if first:
             actions = " ".join(
                 "%s %s" % (_q(a), p)
@@ -614,7 +619,7 @@ def _node_line(
         )
 
     # Personal node
-    head = "p %s %d %d" % (_q(n.nodeid), iset.player, iset.id)
+    head = "p %s %d %d" % (_q(""), iset.player, iset.id)
     if first:
         actions = " ".join(_q(a) for a in iset.actions)
         head += " %s { %s }" % (_q(""), actions)