diff --git a/drama/src/rev-mc.c b/drama/src/rev-mc.c
index 5cad791..46b9bab 100644
--- a/drama/src/rev-mc.c
+++ b/drama/src/rev-mc.c
@@ -358,9 +358,9 @@ find_row_mask(std::vector<set_t> &sets,
                 while (cur_mask < last_mask && step_count > 0 && !found.load(std::memory_order_relaxed)) {
                     for (int i = std::min(step_count, step); i > 0 && cur_mask < last_mask; --i) {
                         cur_mask = next_bit_permutation(cur_mask);
-                        if (cnt.fetch_add(1) % 1000000000 == 0) {
-                            fprintf(stderr, "cnt : %ld, step_count: %5ld\n", cnt.load(std::memory_order_relaxed),
-                                    step_count);
+                        if (cnt.fetch_add(1) % 10000000 == 0) {
+                            fprintf(stderr, "cnt : %ld, step_count: %5ld, cur_pos: %5ld\n",
+                                    cnt.load(std::memory_order_relaxed), step_count, g_cur_pos.load());
                         }
                     }
                     step_count -= std::min(step_count, step);