diff --git a/app/controllers/Application.scala b/app/controllers/Application.scala
index 2d098785b4..1ece63edc9 100644
--- a/app/controllers/Application.scala
+++ b/app/controllers/Application.scala
@@ -5,14 +5,17 @@ import DataForm._
 
 import play.api._
 import play.api.mvc._
-import play.api.libs.json._
+import com.codahale.jerkson.Json.{ generate => jsonify }
 
 object Application extends Controller {
 
   val env = new HttpEnv(Play.unsafeApplication.configuration.underlying)
+  val json = "application/json"
 
   def sync(id: String, color: String, version: Int, fullId: String) = Action {
-    Ok(toJson(env.syncer.sync(id, color, version, fullId)))
+    Ok(jsonify(
+      env.syncer.sync(id, color, version, fullId).unsafePerformIO
+    )) as json
   }
 
   def move(fullId: String) = Action { implicit request ⇒
diff --git a/project/Build.scala b/project/Build.scala
index d828b46285..d6862f10cd 100644
--- a/project/Build.scala
+++ b/project/Build.scala
@@ -14,13 +14,13 @@ trait Dependencies {
   val scalaz = "org.scalaz" %% "scalaz-core" % "6.0.4"
   val specs2 = "org.specs2" %% "specs2" % "1.8.2"
   val redis = "net.debasishg" %% "redisclient" % "2.4.2"
-  val json = "net.liftweb" %% "lift-json" % "2.4"
   val casbah = "com.mongodb.casbah" %% "casbah" % "2.1.5-1"
   val salat = "com.novus" %% "salat-core" % "0.0.8-SNAPSHOT"
   val slf4j = "org.slf4j" % "slf4j-nop" % "1.6.4"
   val scalalib = "com.github.ornicar" %% "scalalib" % "1.23"
   val hasher = "com.roundeights" % "hasher" % "0.3" from "http://cloud.github.com/downloads/Nycto/Hasher/hasher_2.9.1-0.3.jar"
   val config = "com.typesafe.config" % "config" % "0.3.0"
+  val json = "com.codahale" %% "jerkson" % "0.5.0"
 
   // benchmark
   val instrumenter = "com.google.code.java-allocation-instrumenter" % "java-allocation-instrumenter" % "2.0"
diff --git a/system/src/main/scala/Syncer.scala b/system/src/main/scala/Syncer.scala
index 76751aad1a..ab090510cf 100644
--- a/system/src/main/scala/Syncer.scala
+++ b/system/src/main/scala/Syncer.scala
@@ -6,6 +6,8 @@ import scalaz.effects._
 
 final class Syncer(repo: GameRepo) {
 
+  val reload = Map("reload" -> true)
+
   def sync(
     id: String,
     colorString: String,
@@ -15,16 +17,16 @@ final class Syncer(repo: GameRepo) {
       color ← io { Color(colorString) err "Invalid color" }
       gameAndPlayer ← repo.player(id, color)
       (g, p) = gameAndPlayer
-      //events ← io { eventsSince(p, version) }
-    } yield Map(
-      "v" -> p.eventStack.version,
-      //"e" -> events map (_.toMap),
-      "p" -> g.player,
-      "t" -> g.turns
-    )
-  } except (e ⇒ io(Map("reload" -> true)))
-
-  def eventsSince(player: DbPlayer, version: Int): List[Event] =
-    player.eventStack.eventsSince(version) | Nil
+    } yield {
+      p.eventStack eventsSince version map { events ⇒
+        Map(
+          "v" -> p.eventStack.lastVersion,
+          "e" -> (events map (_.export)),
+          "p" -> g.player.color.name,
+          "t" -> g.turns
+        )
+      } getOrElse reload
+    }
+  } except (e ⇒ io(reload))
 
 }
diff --git a/system/src/main/scala/SystemEnv.scala b/system/src/main/scala/SystemEnv.scala
index 2958956b51..d45a28912b 100644
--- a/system/src/main/scala/SystemEnv.scala
+++ b/system/src/main/scala/SystemEnv.scala
@@ -15,6 +15,9 @@ trait SystemEnv {
     repo = gameRepo,
     ai = ai)
 
+  def syncer = new Syncer(
+    repo = gameRepo)
+
   lazy val ai: Ai = new StupidAi
 
   def gameRepo = new GameRepo(
diff --git a/system/src/main/scala/model/Event.scala b/system/src/main/scala/model/Event.scala
index 24778e7706..7a1371b997 100644
--- a/system/src/main/scala/model/Event.scala
+++ b/system/src/main/scala/model/Event.scala
@@ -6,6 +6,7 @@ import Pos.{ piotr, allPiotrs }
 
 sealed trait Event {
   def encode: String
+  def export: Map[String, Any]
 }
 object Event {
 
@@ -48,6 +49,8 @@ object EventDecoder {
 
 case class StartEvent() extends Event {
   def encode = "s"
+  def export = Map(
+    "type" -> "start")
 }
 object StartEvent extends EventDecoder {
   def decode(str: String) = Some(StartEvent())
@@ -55,6 +58,11 @@ object StartEvent extends EventDecoder {
 
 case class MoveEvent(orig: Pos, dest: Pos, color: Color) extends Event {
   def encode = "m" + orig.piotr + dest.piotr + color.letter
+  def export = Map(
+    "type" -> "move",
+    "from" -> orig.key,
+    "to" -> dest.key,
+    "color" -> color.name)
 }
 object MoveEvent extends EventDecoder {
   def apply(move: Move): MoveEvent = MoveEvent(move.orig, move.dest, move.piece.color)
@@ -72,6 +80,11 @@ case class PossibleMovesEvent(moves: Map[Pos, List[Pos]]) extends Event {
   def encode = "p" + (moves map {
     case (orig, dests) ⇒ (orig :: dests) map (_.piotr) mkString
   } mkString ",")
+  def export = Map(
+    "type" -> "possible_moves",
+    "possible_moves" -> (moves map {
+      case (o, d) ⇒ o.key -> (d map (_.key) mkString)
+    }))
 }
 object PossibleMovesEvent extends EventDecoder {
   def decode(str: String) = Some(PossibleMovesEvent(
@@ -90,6 +103,9 @@ object PossibleMovesEvent extends EventDecoder {
 
 case class EnpassantEvent(killed: Pos) extends Event {
   def encode = "E" + killed.piotr
+  def export = Map(
+    "type" -> "enpassant",
+    "killed" -> killed.key)
 }
 object EnpassantEvent extends EventDecoder {
   def decode(str: String) = for {
@@ -100,7 +116,11 @@ object EnpassantEvent extends EventDecoder {
 
 case class CastlingEvent(king: (Pos, Pos), rook: (Pos, Pos), color: Color) extends Event {
   def encode = "c" + king._1.piotr + king._2.piotr + rook._1.piotr + rook._2.piotr + color.letter
-
+  def export = Map(
+    "type" -> "castling",
+    "king" -> List(king._1.key, king._2.key),
+    "rook" -> List(rook._1.key, rook._2.key),
+    "color" -> color.name)
 }
 object CastlingEvent extends EventDecoder {
   def decode(str: String) = str.toList match {
@@ -119,6 +139,9 @@ object CastlingEvent extends EventDecoder {
 
 case class RedirectEvent(url: String) extends Event {
   def encode = "r" + url
+  def export = Map(
+    "type" -> "redirect",
+    "url" -> url)
 }
 object RedirectEvent extends EventDecoder {
   def decode(str: String) = Some(RedirectEvent(str))
@@ -126,6 +149,10 @@ object RedirectEvent extends EventDecoder {
 
 case class PromotionEvent(role: PromotableRole, pos: Pos) extends Event {
   def encode = "P" + role.forsyth + pos.piotr
+  def export = Map(
+    "type" -> "promotion",
+    "key" -> pos.key,
+    "pieceClass" -> role.toString)
 }
 object PromotionEvent extends EventDecoder {
   def decode(str: String) = str.toList match {
@@ -139,6 +166,9 @@ object PromotionEvent extends EventDecoder {
 
 case class CheckEvent(pos: Pos) extends Event {
   def encode = "C" + pos.piotr
+  def export = Map(
+    "type" -> "check",
+    "key" -> pos.key)
 }
 object CheckEvent extends EventDecoder {
   def decode(str: String) = for {
@@ -149,6 +179,9 @@ object CheckEvent extends EventDecoder {
 
 case class MessageEvent(author: String, message: String) extends Event {
   def encode = "M" + author + " " + message.replace("|", "(pipe)")
+  def export = Map(
+    "type" -> "message",
+    "message" -> List(author, message))
 }
 object MessageEvent extends EventDecoder {
   def decode(str: String) = str.split(' ').toList match {
@@ -161,6 +194,8 @@ object MessageEvent extends EventDecoder {
 
 case class EndEvent() extends Event {
   def encode = "e"
+  def export = Map(
+    "type" -> "end")
 }
 object EndEvent extends EventDecoder {
   def decode(str: String) = Some(EndEvent())
@@ -168,6 +203,8 @@ object EndEvent extends EventDecoder {
 
 case class ThreefoldEvent() extends Event {
   def encode = "t"
+  def export = Map(
+    "type" -> "threefold_repetition")
 }
 object ThreefoldEvent extends EventDecoder {
   def decode(str: String) = Some(ThreefoldEvent())
@@ -175,6 +212,8 @@ object ThreefoldEvent extends EventDecoder {
 
 case class ReloadTableEvent() extends Event {
   def encode = "R"
+  def export = Map(
+    "type" -> "reload_table")
 }
 object ReloadTableEvent extends EventDecoder {
   def decode(str: String) = Some(ReloadTableEvent())
@@ -182,6 +221,10 @@ object ReloadTableEvent extends EventDecoder {
 
 case class MoretimeEvent(color: Color, seconds: Int) extends Event {
   def encode = "T" + color.letter + seconds
+  def export = Map(
+    "type" -> "moretime",
+    "color" -> color.name,
+    "seconds" -> seconds)
 }
 object MoretimeEvent extends EventDecoder {
   def decode(str: String) = for {
diff --git a/system/src/main/scala/model/EventStack.scala b/system/src/main/scala/model/EventStack.scala
index 27952038f8..ee064bb1c1 100644
--- a/system/src/main/scala/model/EventStack.scala
+++ b/system/src/main/scala/model/EventStack.scala
@@ -29,14 +29,12 @@ case class EventStack(events: List[(Int, Event)]) {
     )
   }
 
-  def version: Int = events.lastOption map (_._1) getOrElse 0
-
   def eventsSince(version: Int): Option[List[Event]] = for {
-    first <- firstVersion
+    first ← firstVersion
     if version >= first - 1
-    last <- lastVersion
+    last ← lastVersion
     if version <= last
-  } yield sortedEvents dropWhile { ve => ve._1 <= version } map (_._2)
+  } yield sortedEvents dropWhile { ve ⇒ ve._1 <= version } map (_._2)
 
   def withEvents(newEvents: List[Event]): EventStack = {
 
@@ -45,7 +43,7 @@ case class EventStack(events: List[(Int, Event)]) {
       case event :: rest ⇒ (v + 1, event) :: versionEvents(v + 1, rest)
     }
 
-    copy(events = events ++ versionEvents(version, newEvents))
+    copy(events = events ++ versionEvents(lastVersion getOrElse 0, newEvents))
   }
 }
 
diff --git a/system/src/test/scala/ServerTest.scala b/system/src/test/scala/ServerTest.scala
index c0b25f031c..c153ff5096 100644
--- a/system/src/test/scala/ServerTest.scala
+++ b/system/src/test/scala/ServerTest.scala
@@ -123,7 +123,9 @@ B p p
         "high version number" in {
           found must beIO.like {
             case vg ⇒ vg must beSuccess.like {
-              case g ⇒ g.player(White).eventStack.version must be_>(20)
+              case g ⇒ g.player(White).eventStack.lastVersion must beSome.like {
+                case v => v must be_>(20)
+              }
             }
           }
         }