diff --git a/main.c b/main.c
index c52dd06..0eb49a7 100644
--- a/main.c
+++ b/main.c
@@ -10,7 +10,7 @@
 #include "minimap.h"
 #include "mmpriv.h"
 
-#define MM_VERSION "2.0-r108-pre"
+#define MM_VERSION "2.0-r109-pre"
 
 void liftrlimit()
 {
diff --git a/map.c b/map.c
index a19d53e..39c7308 100644
--- a/map.c
+++ b/map.c
@@ -28,7 +28,7 @@ void mm_mapopt_init(mm_mapopt_t *opt)
 	opt->max_join_short = 2000;
 	opt->min_join_flank_sc = 1000;
 
-	opt->a = 1, opt->b = 1, opt->q = 1, opt->e = 1;
+	opt->a = 1, opt->b = 2, opt->q = 2, opt->e = 1;
 	opt->zdrop = 100;
 	opt->min_dp_score = 0;
 	opt->min_ksw_len = 100;