fix: 修复point util不能处理pass的问题。

ngochess/gtp/util.go

@@ -11,7 +11,7 @@ const alphaUpper = "ABCDEFGHJKLMNOPQRSTUVWXYZ"
 
 func Point(x, y int) string {
 	if x < 0 || x >= 25 || y < 0 || y >= 25 {
-		return ""
+		return "PASS"
 	}
 	return fmt.Sprintf("%s%d", byteToString(alphaUpper[x]), y+1)
 }
@@ -21,6 +21,9 @@ func byteToString(b byte) string {
 }
 
 func ParsePoint(pos string) (x, y int) {
+	if strings.ToUpper(pos) == "PASS" {
+		return 255, 255
+	}
 	x = byteToIndex(alpha, pos[0])
 	if x == -1 {
 		x = byteToIndex(alphaUpper, pos[0])