diff --git a/app/views/account/pref.scala.html b/app/views/account/pref.scala.html
index e95af0fd5a..a6d2782fe3 100644
--- a/app/views/account/pref.scala.html
+++ b/app/views/account/pref.scala.html
@@ -24,16 +24,25 @@
             <h2>Show board highlights (last move and check)</h2>
             @base.radios(form("highlight"), Seq(0 -> "No", 1 -> "Yes"))
           </li>
+          <li>
+            <h2>Show board coordinates (A-H, 1-8)</h2>
+            @base.radios(form("coords"), Pref.Coords.choices)
+          </li>
           <li>
             <h2>Show piece destinations (valid moves and premoves)</h2>
             @base.radios(form("destination"), Seq(0 -> "No", 1 -> "Yes"))
           </li>
+        </ul>
+      </fieldset>
+      <fieldset>
+        <legend>Chess clock</legend>
+        <ul>
           <li>
-            <h2>Show tenths of seconds on the clock</h2>
+            <h2>Show tenths of seconds</h2>
             @base.radios(form("clockTenths"), Seq(0 -> "Never", 1 -> "When time remaining < 10 seconds"))
           </li>
           <li>
-            <h2>Show horizontal green bars on the clock</h2>
+            <h2>Show horizontal green bars</h2>
             @base.radios(form("clockBar"), Seq(0 -> "No", 1 -> "Yes"))
           </li>
         </ul>
diff --git a/app/views/base/layout.scala.html b/app/views/base/layout.scala.html
index bf95ef07ee..704e74e5f6 100644
--- a/app/views/base/layout.scala.html
+++ b/app/views/base/layout.scala.html
@@ -47,7 +47,8 @@ openGraph: Map[Symbol, String] = Map.empty)(body: Html)(implicit ctx: Context)
     ctx.currentPieceSet3d,
     ctx.pref.highlight ?? "highlight",
     ctx.blindMode ?? "blind_mode",
-    if (ctx.is3d) "is3d" else "is2d").mkString(" ")"
+    if (ctx.is3d) "is3d" else "is2d",
+    "coords_" + ctx.pref.coords).mkString(" ")"
     data-piece-set="@ctx.currentPieceSet"
     data-static-url="@staticUrl("")"
     data-sound-dir="@staticUrl("sound")"
diff --git a/doc/mobile/play.md b/doc/mobile/play.md
index ae99fa4416..50ded92676 100644
--- a/doc/mobile/play.md
+++ b/doc/mobile/play.md
@@ -193,7 +193,7 @@ Each event has a version number `v`, a type `t` and data `d`.
     "t": "premove",
     "d": null
   }, {
-    "v": 12,                  // game metadata has changed (could be rematch negociation, for instance)
+    "v": 12,                  // game metadata has changed (could be rematch negotiation, for instance)
     "t": "reloadTable",       // fetch the game document for more info
     "d": null
   }, {
@@ -209,12 +209,12 @@ Each event has a version number `v`, a type `t` and data `d`.
 {t: 'resign'}
 ```
 
-## Rematch negociation
+## Rematch negotiation
 
 When the opponent proposes or declines a rematch,
 a `reloadTable` event is sent to the client.
 You should then fetch the game document to learn about
-the rematch negociation state, in `opponent.isOfferingRematch`.
+the rematch negotiation state, in `opponent.isOfferingRematch`.
 
 ### Propose or accept rematch
 
diff --git a/modules/pref/src/main/DataForm.scala b/modules/pref/src/main/DataForm.scala
index 804b54edd1..4e3aedca7d 100644
--- a/modules/pref/src/main/DataForm.scala
+++ b/modules/pref/src/main/DataForm.scala
@@ -16,6 +16,7 @@ private[pref] final class DataForm(api: PrefApi) {
     "follow" -> number.verifying(Set(0, 1) contains _),
     "highlight" -> number.verifying(Set(0, 1) contains _),
     "destination" -> number.verifying(Set(0, 1) contains _),
+    "coords" -> number.verifying(Pref.Coords.choices.toMap contains _),
     "challenge" -> number.verifying(Pref.Challenge.choices.toMap contains _),
     "premove" -> number.verifying(Set(0, 1) contains _),
     "animation" -> number.verifying(Set(0, 1, 2, 3) contains _),
@@ -31,6 +32,7 @@ private[pref] final class DataForm(api: PrefApi) {
       follow: Int,
       highlight: Int,
       destination: Int,
+      coords: Int,
       challenge: Int,
       premove: Int,
       animation: Int,
@@ -45,6 +47,7 @@ private[pref] final class DataForm(api: PrefApi) {
       follow = follow == 1,
       highlight = highlight == 1,
       destination = destination == 1,
+      coords = coords,
       challenge = challenge,
       premove = premove == 1,
       animation = animation,
@@ -62,6 +65,7 @@ private[pref] final class DataForm(api: PrefApi) {
       follow = pref.follow.fold(1, 0),
       highlight = pref.highlight.fold(1, 0),
       destination = pref.destination.fold(1, 0),
+      coords = pref.coords,
       challenge = pref.challenge,
       premove = pref.premove.fold(1, 0),
       animation = pref.animation,
diff --git a/modules/pref/src/main/Pref.scala b/modules/pref/src/main/Pref.scala
index 660e040e20..5225cedc71 100644
--- a/modules/pref/src/main/Pref.scala
+++ b/modules/pref/src/main/Pref.scala
@@ -25,6 +25,7 @@ case class Pref(
     follow: Boolean,
     highlight: Boolean,
     destination: Boolean,
+    coords: Int,
     challenge: Int,
     coordColor: Int,
     puzzleDifficulty: Int,
@@ -145,6 +146,17 @@ object Pref {
       SLOW -> "Slow")
   }
 
+  object Coords {
+    val NONE = 0
+    val INSIDE = 1
+    val OUTSIDE = 2
+
+    val choices = Seq(
+      NONE -> "Nope",
+      INSIDE -> "Inside the board",
+      OUTSIDE -> "Outside the board")
+  }
+
   object Challenge {
     val NEVER = 1
     val RATING = 2
@@ -189,6 +201,7 @@ object Pref {
     follow = true,
     highlight = true,
     destination = true,
+    coords = Coords.OUTSIDE,
     challenge = Challenge.RATING,
     coordColor = Color.RANDOM,
     puzzleDifficulty = Difficulty.NORMAL,
diff --git a/modules/pref/src/main/PrefApi.scala b/modules/pref/src/main/PrefApi.scala
index a6b6dde6e5..8bd94a0e44 100644
--- a/modules/pref/src/main/PrefApi.scala
+++ b/modules/pref/src/main/PrefApi.scala
@@ -39,13 +39,36 @@ final class PrefApi(coll: Coll, cacheTtl: Duration) {
       follow = r.getD("follow", Pref.default.follow),
       highlight = r.getD("highlight", Pref.default.highlight),
       destination = r.getD("destination", Pref.default.destination),
+      coords = r.getD("coords", Pref.default.coords),
       challenge = r.getD("challenge", Pref.default.challenge),
       coordColor = r.getD("coordColor", Pref.default.coordColor),
       puzzleDifficulty = r.getD("puzzleDifficulty", Pref.default.puzzleDifficulty),
       tags = r.getD("tags", Pref.default.tags))
 
-    private val writer = Macros.writer[Pref]
-    def writes(w: BSON.Writer, o: Pref) = writer write o
+    def writes(w: BSON.Writer, o: Pref) = BSONDocument(
+      "_id" -> o._id,
+      "dark" -> o.dark,
+      "is3d" -> o.is3d,
+      "theme" -> o.theme,
+      "pieceSet" -> o.pieceSet,
+      "theme3d" -> o.theme3d,
+      "pieceSet3d" -> o.pieceSet3d,
+      "autoQueen" -> o.autoQueen,
+      "autoThreefold" -> o.autoThreefold,
+      "takeback" -> o.takeback,
+      "clockTenths" -> o.clockTenths,
+      "clockBar" -> o.clockBar,
+      "premove" -> o.premove,
+      "animation" -> o.animation,
+      "captured" -> o.captured,
+      "follow" -> o.follow,
+      "highlight" -> o.highlight,
+      "destination" -> o.destination,
+      "coords" -> o.coords,
+      "challenge" -> o.challenge,
+      "coordColor" -> o.coordColor,
+      "puzzleDifficulty" -> o.puzzleDifficulty,
+      "tags" -> o.tags)
   }
 
   def saveTag(user: User, name: String, value: String) =
diff --git a/modules/round/src/main/JsonView.scala b/modules/round/src/main/JsonView.scala
index 6045f78851..d9b9d258ea 100644
--- a/modules/round/src/main/JsonView.scala
+++ b/modules/round/src/main/JsonView.scala
@@ -84,6 +84,7 @@ final class JsonView(
               "animationDuration" -> animationDuration(pov, pref),
               "highlight" -> pref.highlight,
               "destination" -> pref.destination,
+              "coords" -> pref.coords,
               "autoQueen" -> pref.autoQueen,
               "clockTenths" -> pref.clockTenths,
               "clockBar" -> pref.clockBar,
@@ -155,6 +156,7 @@ final class JsonView(
             "pref" -> Json.obj(
               "animationDelay" -> animationDuration(pov, pref),
               "highlight" -> pref.highlight,
+              "coords" -> pref.coords,
               "clockTenths" -> pref.clockTenths,
               "clockBar" -> pref.clockBar,
               "showCaptured" -> pref.captured
diff --git a/public/javascripts/common.js b/public/javascripts/common.js
index c1f037da3f..1b00c21a64 100644
--- a/public/javascripts/common.js
+++ b/public/javascripts/common.js
@@ -9,6 +9,7 @@ function parseFen($elem) {
     var color = $this.data('color');
     var ground = $this.data('chessground');
     var config = {
+      coordinates: false,
       viewOnly: true,
       fen: $this.data('fen'),
       lastMove: lm ? [lm[0] + lm[1], lm[2] + lm[3]] : [],
diff --git a/public/stylesheets/board.css b/public/stylesheets/board.css
index 2856f58cfe..953e28fec4 100644
--- a/public/stylesheets/board.css
+++ b/public/stylesheets/board.css
@@ -1106,13 +1106,13 @@ div.control .rematch.disabled {
 }
 #claim_draw_zone,
 div.force_resign_zone,
-div.negociation {
+div.negotiation {
   margin-top: 10px;
   padding-top: 10px;
   border-top: 1px solid #ddd;
 }
 #claim_draw_zone .button,
-div.negociation .button,
+div.negotiation .button,
 div.force_resign_zone .button {
   display: inline-block;
 }
diff --git a/public/stylesheets/chessground.css b/public/stylesheets/chessground.css
index a337de3880..9dcd77f68e 100644
--- a/public/stylesheets/chessground.css
+++ b/public/stylesheets/chessground.css
@@ -41,8 +41,6 @@ body.is3d .cg-board {
   position: absolute;
   font-size: 11px;
   line-height: 11px;
-  color: #fff;
-  text-shadow: 0 1px 2px #000;
   opacity: 0.7;
   text-transform: uppercase;
 }
@@ -56,6 +54,32 @@ body.is3d .cg-board {
   right: 1px;
   top: 1px;
 }
+body.coords_1 .cg-square[data-coord-x]::after {
+  color: #fff;
+  text-shadow: 0 1px 2px #000;
+}
+body.coords_1 .cg-square[data-coord-y]::before {
+  color: #fff;
+  text-shadow: 0 1px 2px #000;
+}
+body.coords_2 .cg-square[data-coord-x]::after {
+  bottom: -11px;
+  left: 29px;
+  color: #bbb;
+  font-weight: bold;
+}
+body.coords_2.is3d .cg-square[data-coord-x]::after {
+  bottom: -22px;
+}
+body.coords_2 .cg-square[data-coord-y]::before {
+  right: -8px;
+  top: 26px;
+  color: #bbb;
+  font-weight: bold;
+}
+body.coords_2.is3d .cg-square[data-coord-y]::before {
+  top: 24px;
+}
 .cg-square.move-dest {
   background: radial-gradient(rgba(20, 85, 30, 0.3) 22%, #208530 0, rgba(0, 0, 0, 0.3) 0, rgba(0, 0, 0, 0) 0);
   cursor: pointer;
diff --git a/public/stylesheets/dark.css b/public/stylesheets/dark.css
index 0ab91c215c..32df548e27 100644
--- a/public/stylesheets/dark.css
+++ b/public/stylesheets/dark.css
@@ -125,7 +125,7 @@ body.dark #hooks_list .pool_buttons > a,
 body.dark #hooks_list .pool_title,
 body.dark div.training div.box,
 body.dark div.force_resign_zone,
-body.dark div.negociation {
+body.dark div.negotiation {
   border-color: #3d3d3d;
 }
 body.dark #crosstable td.last {
@@ -163,6 +163,8 @@ body.dark #tv_history a.user_link,
 body.dark #timeline a.user_link,
 body.dark #team .forum a.user_link,
 body.dark span.board_mark,
+body.dark.coords_2 .cg-square[data-coord-x]::after,
+body.dark.coords_2 .cg-square[data-coord-y]::before,
 body.dark div.user_show div.content_box_top > span,
 body.dark span.progress > .zero,
 body.dark div.undertable_top span.title {
diff --git a/ui/round/package.json b/ui/round/package.json
index 35dd8caf7e..879e281718 100644
--- a/ui/round/package.json
+++ b/ui/round/package.json
@@ -30,7 +30,7 @@
     "watchify": "^1.0.2"
   },
   "dependencies": {
-    "chessground": "^1.5.6",
+    "chessground": "^1.5.7",
     "lodash-node": "^2.4.1",
     "mithril": "^0.1.22"
   }
diff --git a/ui/round/src/ground.js b/ui/round/src/ground.js
index 37e801bd61..5b33017c9f 100644
--- a/ui/round/src/ground.js
+++ b/ui/round/src/ground.js
@@ -9,6 +9,7 @@ function makeConfig(data, fen) {
     turnColor: data.game.player,
     lastMove: util.str2move(data.game.lastMove),
     check: data.game.check,
+    coordinates: data.pref.coords !== 0,
     highlight: {
       lastMove: data.pref.highlight,
       check: data.pref.highlight,
diff --git a/ui/round/src/view/table.js b/ui/round/src/view/table.js
index 196eb373d0..493b15c90b 100644
--- a/ui/round/src/view/table.js
+++ b/ui/round/src/view/table.js
@@ -152,13 +152,13 @@ function renderTablePlay(ctrl) {
         onclick: partial(ctrl.socket.send, 'draw-claim', null)
       }, ctrl.trans('claimADraw'))
     ]) : (
-      d.player.isOfferingDraw ? m('div.negociation', [
+      d.player.isOfferingDraw ? m('div.negotiation', [
         ctrl.trans('drawOfferSent') + ' ',
         m('a', {
           onclick: partial(ctrl.socket.send, 'draw-no', null)
         }, ctrl.trans('cancel'))
       ]) : null,
-      d.opponent.isOfferingDraw ? m('div.negociation', [
+      d.opponent.isOfferingDraw ? m('div.negotiation', [
         ctrl.trans('yourOpponentOffersADraw'),
         m('br'),
         m('a.button[data-icon=E]', {
@@ -170,13 +170,13 @@ function renderTablePlay(ctrl) {
         }, ctrl.trans('decline')),
       ]) : null
     ),
-    d.player.isProposingTakeback ? m('div.negociation', [
+    d.player.isProposingTakeback ? m('div.negotiation', [
       ctrl.trans('takebackPropositionSent') + ' ',
       m('a', {
         onclick: partial(ctrl.socket.send, 'takeback-no', null)
       }, ctrl.trans('cancel'))
     ]) : null,
-    d.opponent.isProposingTakeback ? m('div.negociation', [
+    d.opponent.isProposingTakeback ? m('div.negotiation', [
       ctrl.trans('yourOpponentProposesATakeback'),
       m('br'),
       m('a.button[data-icon=E]', {