I'm sure it may have a bug or two but the stretch screen method worked a treat...
(https://lh4.ggpht.com/u-bQazN3MujQKCYzQKWZ54SBe_UZp2OaZfxuiMHwCUNIlD4aqaXdwhkVrNaVnIfeaOQ=w300-rw)
https://play.google.com/store/apps/details?id=com.sigmasolutions.knightclock&hl=en
Its FREE to install on Google Play
Use with Chess, Backgammon, Scrabble, etc...