update tag model for sgf backgammon

Author: JamesHeppell

build.sbt

@@ -2,7 +2,7 @@ name := "strategygames"
 
 organization := "org.playstrategy"
 
-version := "10.2.1-pstrat174"
+version := "10.2.1-pstrat175"
 
 scalaVersion := "2.13.10"
 

src/main/scala/backgammon/Pos.scala

@@ -80,7 +80,7 @@ case class Pos private (index: Int) extends AnyVal {
   def piotr: Char = Piotr.lookup.get(index).getOrElse('?')
   def piotrStr    = piotr.toString
 
-  def sgf = (97 + (23 - index)).toChar.toString()
+  def sgf = (97 + index).toChar.toString()
 
   def last: Boolean = (index + 1) % File.all.size == 0
 

src/main/scala/format/sgf/tagModel.scala

@@ -42,8 +42,9 @@ object Tags {
 
   val importantTagRoster          = List(
     Tag.FF,
-    Tag.CA,
     Tag.GM,
+    Tag.CA,
+    Tag.AP,
     Tag.DT,
     Tag.EV,
     Tag.TM,
@@ -59,6 +60,7 @@ object Tag {
   case object FF extends TagType // File Format
   case object CA extends TagType // Character
   case object GN extends TagType // Game Name
+  case object AP extends TagType // Application
   case object DT extends TagType { // Date time
     val format = DateTimeFormat forPattern "yyyy.MM.dd" withZone DateTimeZone.UTC
   }
@@ -94,8 +96,9 @@ object Tag {
 
   val tagTypes                                  = List(
     FF,
-    CA,
     GN,
+    CA,
+    AP,
     DT,
     PC,
     EV,