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:         NewGame = newGame
          Play = playIfRunning }
  
  open Fable.Core 
  open Fable.Import.Browser
  open System
  
negative.code:     selectGame.selectedIndex <- 0.0 
      updateUi game
  
  buttonNewGame.addEventListener_click((fun _ -> newGameOnClick(); null))
      
  let selectGameOnChange () =
      let presetGtor gameNum =
  