White to play and checkmate in two moves

1.Bb6! (2.Nxc7#[B])
1...Re6 2.Qxe6#
1...Bc3+/Bxb6 2.Nxc3#
1...Re7 2.Nf6#
1...Rxg8+ 2.Qxg8#
1...Nd4 2.Rxd4#

Date added: 5/5/2021

1.Qe3! ~ 2.Nc3#
1...Rd3 2.Bg2#
1...Bd3 2.Qd4#
1...Be4 2.Qb3#
1...Nd6 2.Rc5#
1...Nd6 2.Qe5#
1...Bd6 2.Nb6#
1...d6 2.Qe6#
1...b4 (b:a4) 2.Bc4#
1...Rc2
2.Qd4#
2.Qd3#

Date added: 5/5/2021

1.Bd2! ~ 2.Bc3#
1...Be1 2.Be3#
1...Rxf5+ 2.Kxf5#
1...Nb5 2.Kg5#

Date added: 5/5/2021

1. a×b5 ep.! - Ka5

2. R×a7#

White is about to move at this stage of the game, so the previous move was made by black. This much is trivial, but which move did black make? There are only three black pieces on the board so we can investigate all of the possibilities:

The pawn on a7 is still on its original position from the beginning of the game, so we can eliminate that possibility. The king could have arrived at a6 from either b6 or b7. But upon further inspection, this is impossible. The black king couldn't occupy b6 on the previous move because of the presence of the white king on c5. Also, the black king couldn't occupy b7 on the previous move because of the white pawn on c6 (which couldn't move on the previous move). Thus, the conclusion is that the last move was made by the black pawn on b5. What move was that? Either b7- b5, or b6 - b5. The pawn on b5 couldn't have occupied b6, however, because of the presence of the white king on c5, so the previous move had to be b7- b5.

Date added: 7/5/2021

1.Rf4! zz
1...d4 2.Rxd4#
1...Nh5/Ne6/Ne8 2.Rd7#
1...Nc1/Nc3 2.Bxb4#
1...exf4 2.Qxf4#
1...e4 2.Rxf5#

Date added: 7/5/2021

1.Bd3! (2.Rfxf7#)
1...Nd6/f6 2.Nxg6#
1...f5 2.Nxd7#
1...Rf6 2.Qa8#
1...Qf3/Qf1 2.Nxd7#/Qxh6#
1...Qf5/Qe6 2.Qxh6#

Date added: 7/5/2021

1.Rc4!
1...Rb1 (R~b) 2.Nc3#
1...Rxa3 (R~3) 2.Nb6#
1...Rb6
2.Nc3#
2.Nxb6#
1...Rc3
2.Nxc3#
2.Nb6#
1...Nd4 2.Rc5#
1...Ne3 (N5~) 2.Qc6#
1...Rxe6 2.Qc6#
1...Rh6 (Rg6) 2.Rc5#
1...Ne5 2.Rxe5#
1...Nxh8 (N7~) 2.Re5#

Date added: 7/5/2021

1.Qg4! ~ 2.Rc5#
1...Rxe6 2.Qxd4#
1...Nxe6 2.Qe4#
1...Qxe5 2.c4#
1...Nxe5 2.Rxd4#
1...Bxe5 2.c4#
1...Kxe5 2.Qf5#

Date added: 7/5/2021

1.Nd8! (2.Qxd6#)
1...Rxc6 2.Nxc6#
1...Be6+ 2.Rxe6#
1...Nc5 2.Qc3#
1...Bxf6 2.Bxf6#

Date added: 7/5/2021

1.Ne3! ~ 2.Qe4#
1...Nf3 2.Ng4#
1...Rxd3 2.Nc4#
1...Qg6 2.Bxd4#

Date added: 7/5/2021

1. Ba7! [2. Rd4#]
1. ... Be5/b6 2. N(x)b6#
1. ... e5 2. Nxf6#
1. ... Nf5 2. Qc5#
1. ... Rcd2 2. Nc3#
1. ... Red2 2. Nxe3#

Date added: 7/5/2021

1.e4! zz
1...e6 2.Nc4#
1...Nf4 2.Nf7#
1...Nh4/Ne1/Ne3 2.f4#
1...exd6 2.Bxd6#
1...Nh1/Nh5/Nf1/Nf5+/Ne2/Nxe4 2.Rf5#
1...dxe3 e.p. 2.Bc3#

Date added: 7/5/2021