diff --git a/cmd/mtredisalize/sqlite.go b/cmd/mtredisalize/sqlite.go
index 4929f29..e72b890 100644
--- a/cmd/mtredisalize/sqlite.go
+++ b/cmd/mtredisalize/sqlite.go
@@ -17,18 +17,13 @@ import (
 var globalLock sync.RWMutex
 
 const (
-	fetchSQL     = "SELECT data FROM blocks WHERE pos = ?"
-	existsSQL    = "SELECT 1 FROM blocks WHERE pos = ?"
-	updateSQL    = "UPDATE blocks SET data = ? WHERE pos = ?"
-	insertSQL    = "INSERT INTO blocks (pos, data) VALUES (?, ?)"
-	countSQL     = "SELECT count(*) FROM blocks"
-	keysSQL      = "SELECT pos FROM blocks"
-	rangeSQL     = "SELECT pos, data FROM blocks WHERE pos BETWEEN ? AND ? ORDER BY pos"
-	rangeDuffSQL = "SELECT pos, data FROM blocks WHERE " +
-		"pos BETWEEN ? AND ? OR " +
-		"pos BETWEEN ? AND ? OR " +
-		"pos BETWEEN ? AND ? OR " +
-		"pos BETWEEN ? AND ?"
+	fetchSQL  = "SELECT data FROM blocks WHERE pos = ?"
+	existsSQL = "SELECT 1 FROM blocks WHERE pos = ?"
+	updateSQL = "UPDATE blocks SET data = ? WHERE pos = ?"
+	insertSQL = "INSERT INTO blocks (pos, data) VALUES (?, ?)"
+	countSQL  = "SELECT count(*) FROM blocks"
+	keysSQL   = "SELECT pos FROM blocks"
+	rangeSQL  = "SELECT pos, data FROM blocks WHERE pos BETWEEN ? AND ? ORDER BY pos"
 )
 
 type SqliteBackend struct {
@@ -105,14 +100,7 @@ func NewSqliteBackend(
 		return
 	}
 
-	var rS string
-	if interleaved {
-		rS = rangeSQL
-	} else {
-		rS = rangeDuffSQL
-	}
-
-	if res.rangeStmt, err = res.db.Prepare(rS); err != nil {
+	if res.rangeStmt, err = res.db.Prepare(rangeSQL); err != nil {
 		res.closeAll()
 		return
 	}
@@ -421,52 +409,6 @@ func (ss *SqliteSession) interleavedSpatialQuery(first, second []byte, done chan
 	return
 }
 
-type duffStmt struct {
-	stmt    *sql.Stmt
-	counter int
-	params  [8]int64
-}
-
-func (ds *duffStmt) push(a, b int64) bool {
-	ds.params[ds.counter] = a
-	ds.counter++
-	ds.params[ds.counter] = b
-	ds.counter++
-	return ds.counter > 7
-}
-
-func (ds *duffStmt) Query() (*sql.Rows, error) {
-	c := ds.counter
-	ds.counter = 0
-	switch c {
-	case 8:
-		return ds.stmt.Query(
-			ds.params[0], ds.params[1],
-			ds.params[2], ds.params[3],
-			ds.params[4], ds.params[5],
-			ds.params[0], ds.params[1])
-	case 6:
-		return ds.stmt.Query(
-			ds.params[0], ds.params[1],
-			ds.params[2], ds.params[3],
-			ds.params[4], ds.params[5],
-			ds.params[0], ds.params[1])
-	case 4:
-		return ds.stmt.Query(
-			ds.params[0], ds.params[1],
-			ds.params[2], ds.params[3],
-			ds.params[0], ds.params[1],
-			ds.params[0], ds.params[1])
-	case 2:
-		return ds.stmt.Query(
-			ds.params[0], ds.params[1],
-			ds.params[0], ds.params[1],
-			ds.params[0], ds.params[1],
-			ds.params[0], ds.params[1])
-	}
-	return nil, nil
-}
-
 func (ss *SqliteSession) plainSpatialQuery(first, second []byte, done chan struct{}) (blocks chan Block, err error) {
 
 	var (
@@ -490,18 +432,17 @@ func (ss *SqliteSession) plainSpatialQuery(first, second []byte, done chan struc
 	go func() {
 		defer globalLock.RUnlock()
 		defer close(blocks)
-		rangeStmt := duffStmt{stmt: ss.txStmt(ss.backend.rangeStmt)}
+		rangeStmt := ss.txStmt(ss.backend.rangeStmt)
 
 		send := func(rows *sql.Rows, err error) bool {
-			if rows == nil {
-				return true
-			}
 			if err != nil {
 				log.Printf("Error in range query: %s\n", err)
 				return false
 			}
 			defer rows.Close()
 
+			count := 0
+
 			for rows.Next() {
 				var key int64
 				var data []byte
@@ -519,6 +460,7 @@ func (ss *SqliteSession) plainSpatialQuery(first, second []byte, done chan struc
 				case <-done:
 					return false
 				}
+				count++
 			}
 			if err = rows.Err(); err != nil {
 				log.Printf("Error in range query: %s\n", err)
@@ -527,37 +469,27 @@ func (ss *SqliteSession) plainSpatialQuery(first, second []byte, done chan struc
 			return true
 		}
 
-		if ss.backend.coverage == nil {
-			a, b := common.Coord{X: c1.X}, common.Coord{X: c2.X}
-			for a.Y = c2.Y; a.Y >= c1.Y; a.Y-- {
-				b.Y = a.Y
-				for a.Z = c1.Z; a.Z <= c2.Z; a.Z++ {
-					b.Z = a.Z
-					// Ordering should not be necessary.
-					from, to := order(common.CoordToPlain(a), common.CoordToPlain(b))
-					if rangeStmt.push(from, to) && !send(rangeStmt.Query()) {
-						return
-					}
-				}
-			}
-		} else {
-			var a, b common.Coord
+		var a, b common.Coord
 
-			for _, r := range ss.backend.coverage.Query(c1, c2) {
-				a.Z, b.Z = int16(r.Z), int16(r.Z)
-				a.X, b.X = int16(r.X1), int16(r.X2)
-				// log.Printf("y1 y2 x1 x2 z: %d %d, %d %d, %d\n", r.Y1, r.Y2, r.X1, r.X2, r.Z)
-				for y := r.Y2; y >= r.Y1; y-- {
-					a.Y, b.Y = int16(y), int16(y)
-					from, to := order(common.CoordToPlain(a), common.CoordToPlain(b))
-					if rangeStmt.push(from, to) && !send(rangeStmt.Query()) {
-						return
-					}
+		for _, r := range ss.backend.coverage.Query(c1, c2) {
+			a.Z, b.Z = int16(r.Z), int16(r.Z)
+			a.X, b.X = int16(r.X1), int16(r.X2)
+			// log.Printf("y1 y2 x1 x2 z: %d %d, %d %d, %d\n", r.Y1, r.Y2, r.X1, r.X2, r.Z)
+			for a.Y = r.Y2; a.Y >= r.Y1; a.Y-- {
+				b.Y = a.Y
+				from, to := common.CoordToPlain(a), common.CoordToPlain(b)
+				if !send(rangeStmt.Query(from, to)) {
+					return
 				}
 			}
 		}
-		send(rangeStmt.Query())
 	}()
 
 	return
 }
+
+func clone(a []byte) []byte {
+	b := make([]byte, len(a))
+	copy(b, a)
+	return b
+}
diff --git a/common/basetilecreator.go b/common/basetilecreator.go
index 84e2003..5517580 100644
--- a/common/basetilecreator.go
+++ b/common/basetilecreator.go
@@ -132,7 +132,7 @@ func (btc *BaseTileCreator) CreateTile(x, z int16, i, j int) error {
 				return err
 			}
 		}
-		log.Printf("Writing empty (%d, %d) to file %s\n", x, z, path)
+		//log.Printf("Writing empty (%d, %d) to file %s\n", x, z, path)
 		return ioutil.WriteFile(path, btc.emptyImage, 0666)
 	}