check next node

main.go

@@ -1,15 +1,40 @@
 package main
 
+import "fmt"
+
 var (
 	// 4x4 board with node counts
 	board = map[int]int{
-		11: 2, 12: 3, 13: 3, 14: 3,
-		21: 1, 22: 4, 23: 5, 24: 9,
-		31: 0, 32: 2, 33: 2, 34: 4,
-		41: 0, 42: 1, 43: 3, 44: 0,
+		10: 2, 11: 3, 12: 3, 13: 3,
+		20: 1, 21: 4, 22: 5, 23: 9,
+		30: 0, 31: 2, 32: 2, 33: 4,
+		40: 0, 41: 1, 42: 3, 43: 0,
 	}
 )
 
 func main() {
+	q := make(chan int, 4)
 
+	// board[p]
+	p := 22
+	// walk and find nodes
+
+	if board[p-11] != 0 { // NW
+		q <- (p - 11)
+	}
+	if board[p-9] != 0 { // NE
+		q <- (p - 9)
+	}
+	if board[p+9] != 0 { // SW
+		q <- (p + 9)
+	}
+	if board[p+11] != 0 { // SE
+		q <- (p + 11)
+	}
+	close(q)
+
+	// Get valid nodes
+	for n := range q {
+		fmt.Println(n)
+	}
 }