Starting position: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR
Bishop and knight checkmate: 8/8/8/8/8/5B2/5K2/5N1k
Easy endgame: 8/3p4/5R2/1RP1k1P1/8/3K4/8/8