2 files changed, 7 insertions, 1 deletions
diff --git a/param.ccl b/param.ccl
index 55b52a6..03bf6b6 100644
--- a/param.ccl
+++ b/param.ccl
@@ -8,6 +8,12 @@ EXTENDS KEYWORD lapse_evolution_method
 }
 
 RESTRICTED:
+CCTK_INT fine_solve "Whether to solve on each sub-step of the finest level evolution"
+{
+    0:1 :: ""
+} 1
+
+RESTRICTED:
 CCTK_INT fd_stencil "finite differencing stencil"
 {
     1: :: ""
diff --git a/src/maximal_slicing_axi_mg.c b/src/maximal_slicing_axi_mg.c
index 11770d5..9d32120 100644
--- a/src/maximal_slicing_axi_mg.c
+++ b/src/maximal_slicing_axi_mg.c
@@ -960,7 +960,7 @@ void msa_mg_eval(CCTK_ARGUMENTS)
         fact1 = (t - lapse_prev0_time[reflevel]) / time_interp_step;
     }
 
-    if (reflevel < ms->nb_levels - 1) {
+    if (!fine_solve || reflevel < ms->nb_levels - 1) {
         /* on coarse levels use extrapolated past solutions */
         int64_t extrap_start = gettime();