diff --git a/main.go b/main.go
index 17b313f..aa9f5ac 100644
--- a/main.go
+++ b/main.go
@@ -1,8 +1,11 @@
 package main
 
-import "fmt"
+import (
+	"fmt"
+	"time"
+)
 
-var field = [9][9]int{
+var grid = [9][9]int{
 	{5, 3, 0, 0, 7, 0, 0, 0, 0},
 	{6, 0, 0, 1, 9, 5, 0, 0, 0},
 	{0, 9, 8, 0, 0, 0, 0, 6, 0},
@@ -15,7 +18,7 @@ var field = [9][9]int{
 }
 
 func draw() {
-	for _, row := range field {
+	for _, row := range grid {
 		fmt.Println(row)
 	}
 	fmt.Println()
@@ -29,7 +32,7 @@ func canPut(x int, y int, value int) bool {
 
 func alreadyInVertical(x int, y int, value int) bool {
 	for i := range [9]int{} {
-		if field[i][x] == value {
+		if grid[i][x] == value {
 			return true
 		}
 	}
@@ -38,7 +41,7 @@ func alreadyInVertical(x int, y int, value int) bool {
 
 func alreadyInHorizontal(x int, y int, value int) bool {
 	for i := range [9]int{} {
-		if field[y][i] == value {
+		if grid[y][i] == value {
 			return true
 		}
 	}
@@ -49,7 +52,7 @@ func alreadyInSquare(x int, y int, value int) bool {
 	sx, sy := int(x/3)*3, int(y/3)*3
 	for dy := range [3]int{} {
 		for dx := range [3]int{} {
-			if field[sy+dy][sx+dx] == value {
+			if grid[sy+dy][sx+dx] == value {
 				return true
 			}
 		}
@@ -69,17 +72,17 @@ func solve(x int, y int) bool {
 	if y == 9 {
 		return true
 	}
-	if field[y][x] != 0 {
+	if grid[y][x] != 0 {
 		return solve(next(x, y))
 	} else {
 		for i := range [9]int{} {
 			var v = i + 1
 			if canPut(x, y, v) {
-				field[y][x] = v
+				grid[y][x] = v
 				if solve(next(x, y)) {
 					return true
 				}
-				field[y][x] = 0
+				grid[y][x] = 0
 			}
 		}
 		return false
@@ -89,10 +92,12 @@ func solve(x int, y int) bool {
 func main() {
 	fmt.Println("Grid to be completed:")
 	draw()
+	startSolving := time.Now()
 	if solve(0, 0) {
-		fmt.Println("I found a solution, see below")
+		stopSolving := time.Since(startSolving)
+		fmt.Printf("I found a solution (in %v):\n", stopSolving)
 		draw()
 	} else {
-		fmt.Println("I did not find a solution")
+		fmt.Println("I did not find a solution...")
 	}
 }