{}
1...b7-b8=R {} 2.Qc2-c3 + {(white King in check moves as a Queen)} Kh3-h8 {} 3.e5-e4 Rb8-d8 # {
black King now moves as a Rook and is therefore mate because }
4.Kd4*d8 + {puts the white King in check by Qc3 and so} 4...Kh8*d8 {becomes possible}
1...b7-b8=B {} 2.Qc2-d3 + {(White King in check moves as a Queen)} Kh3-d7 {} 3.c4-c3 Bb8-a7 # {
black King now moves as a Bishop and is therefore mate because }
4.Kd4*a7 + {puts the white King in check by Qd3 and so} 4...Kd7*a7 {becomes possible}
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