I heard good things about Chessmaster's teaching features, way back from the time of Windows 98. So now I get another thing to lament—that Ubisoft seems to have forgotten about Chessmaster, and it's not on mobile platforms.

(Upd: apparently there was an Android release by Gameloft in 2004, but it looks very questionably: https://www.mobygames.com/game/chessmaster___)