diff --git a/experiments/timfuz/timfuz_checksub.py b/experiments/timfuz/timfuz_checksub.py
index cf290d78..a1bbc5d7 100644
--- a/experiments/timfuz/timfuz_checksub.py
+++ b/experiments/timfuz/timfuz_checksub.py
@@ -8,7 +8,7 @@ import math
 from collections import OrderedDict
 
 # check for issues that may be due to round off error
-STRICT = 0
+STRICT = 1
 
 def Adi2matrix_random(A_ubd, b_ub, names):
     # random assignment
@@ -78,7 +78,7 @@ def row_sub_syms(row, sub_json, verbose=False):
             print('pivot %i %s' % (n, pivot))
         for subk, subv in sorted(sub_json['subs'][group].items()):
             oldn = row.get(subk, 0)
-            rown = oldn - n * subv
+            rown = oldn - n * (1.0* subv[0] / subv[1])
             if verbose:
                 print("  %s: %d => %d" % (subk, oldn, rown))
             if rown == 0:
@@ -208,12 +208,7 @@ def load_sub(fn):
         for name, vals in sorted(j['subs'].items()):
             pivot = None
             for k, v in vals.items():
-                if STRICT:
-                    vi = int(round(v))
-                    assert abs(vi - v) < delta
-                    vals[k] = vi
-                else:
-                    vals[k] = float(v)
+                vals[k] = float(v)
 
                 # there may be more than one acceptable pivot
                 # take the first
diff --git a/experiments/timfuz/timfuz_rref.py b/experiments/timfuz/timfuz_rref.py
index 1fa514b3..0ac87967 100644
--- a/experiments/timfuz/timfuz_rref.py
+++ b/experiments/timfuz/timfuz_rref.py
@@ -14,8 +14,6 @@ import sympy
 from collections import OrderedDict
 from fractions import Fraction
 
-STRICT = 0
-
 def fracr(r):
     DELTA = 0.0001
 
@@ -85,6 +83,12 @@ def Adi2matrix(Adi, cols):
     return A_ub2
 
 def Anp2matrix(Anp):
+    '''
+    Original idea was to make into a square matrix
+    but this loses too much information
+    so now this actually isn't doing anything and should probably be eliminated
+    '''
+
     ncols = len(Anp[0])
     A_ub2 = [np.zeros(ncols) for _i in range(ncols)]
     dst_rowi = 0
@@ -102,6 +106,19 @@ def row_np2ds(rownp, names):
             ret[name] = v
     return ret
 
+def row_sym2dsf(rowsym, names):
+    '''Convert a sympy row into a dictionary of keys to (numerator, denominator) tuples'''
+    from sympy import fraction
+
+    ret = {}
+    assert len(rowsym) == len(names), (len(rowsym), len(names))
+    for namei, name in enumerate(names):
+        v = rowsym[namei]
+        if v:
+            (num, den) = fraction(v)
+            ret[name] = (int(num), int(den))
+    return ret
+
 def comb_corr_sets(state, verbose=False):
     print('Converting rows to integer keys')
     names, Anp = A_ds2np(state.Ads)
@@ -130,50 +147,41 @@ def comb_corr_sets(state, verbose=False):
 
     state.pivots = {}
 
-    def row_solved(rownp, row_pivot):
-        for ci, c in enumerate(rownp):
+    def row_solved(rowsym, row_pivot):
+        for ci, c in enumerate(rowsym):
             if ci == row_pivot:
                 continue
             if c != 0:
                 return False
         return True
 
-    rrefnp = np.array(rref).astype(np.float64)
-    print('Computing groups w/ rref %u row x %u col' % (len(rrefnp), len(rrefnp[0])))
+    #rrefnp = np.array(rref).astype(np.float64)
+    #print('Computing groups w/ rref %u row x %u col' % (len(rrefnp), len(rrefnp[0])))
     #print(rrefnp)
     # rows that have a single 1 are okay
     # anything else requires substitution (unless all 0)
     # pivots may be fewer than the rows
     # remaining rows should be 0s
-    for row_i, (row_pivot, rownp) in enumerate(zip(pivots, rrefnp)):
-        rowds = row_np2ds(rownp, names)
-        # boring cases: solved variable, not fully ranked
-        #if sum(rowds.values()) == 1:
-        if row_solved(rownp, row_pivot):
+    for row_i, row_pivot in enumerate(pivots):
+        rowsym = rref.row(row_i)
+        # yipee! nothign to report
+        if row_solved(rowsym, row_pivot):
             continue
 
         # a grouping
         group_name = "GROUP_%u" % row_i
-        if STRICT:
-            delta = 0.001
-            rowds_store = {}
-            for k, v in rowds.items():
-                vi = int(round(v))
-                error = abs(vi - v)
-                assert error < delta, (error, delta)
-                rowds_store[k] = vi
-        else:
-            rowds_store = rowds
-        state.subs[group_name] = rowds_store
+        rowdsf = row_sym2dsf(rowsym, names)
+
+        state.subs[group_name] = rowdsf
         # Add the new symbol
         state.names.add(group_name)
         # Remove substituted symbols
         # Note: symbols may appear multiple times
-        state.names.difference_update(set(rowds.keys()))
+        state.names.difference_update(set(rowdsf.keys()))
         pivot_name = names[row_pivot]
         state.pivots[group_name] = pivot_name
         if verbose:
-            print("%s (%s): %s" % (group_name, pivot_name, rowds))
+            print("%s (%s): %s" % (group_name, pivot_name, rowdsf))
 
     return state