anchor.diff:      let scoreElement = document.getElementById ("sg-score") :?> HTMLDivElement
   
       let play game (x,y) =
  -        match game with
  -        | Some g -> 
  -            Some (api.Play g { Col = x; Row = y })
  -        | _  -> None
  +        game
  +        |> Core.Option.map (fun g -> api.Play g { Col = x; Row = y })
           |> updateUi
   
       let addListeners maxColIndex maxRowIndex  =
  
positive.code:         let game = api.NewGame { NumberOfColumns = 15; NumberOfRows = 15; StoneGenerator = presetGtor gameNum }
          updateUi game
  
  selectGame.addEventListener_change((fun _ -> selectGameOnChange(); null), false)
  
  api.NewGame defaultConfig |> updateUi 
negative.code:         NewGame = newGame
          Play = playIfRunning }
  
  open FSharp
  open Fable.Core 
  open Fable.Import.Browser
  open System
  