84-Problem Solution.

Solution: 1. Kg4-h4! waiting
1. ... Bc6 ad lib [a] 2. Ba2(x)d5 [A] #
1. ... Sb5 ad lib 2. Rd1(x)d4#

Black king's surrounding squares are unoccupied, and the monarch is far from the board's edges, so we have here a position called mirror mate.

83-Problem Solution.

Set Play:
1. ... f5 2. Be5#
1. ... Kc3 [a] 2. Rxd3 [A] #
1. ... d2 2. Sb3/c2#

Solution: 1. Bf5! [2. Rxd3 [A] #]
1. ... Kd5 [b] /c3 [a] 2. Rxd3 [A] #

Again the theme of this problem is a transfered mate.

82-Problem Solution.

Set Play:

1. ... Bh7 [a] 2. Qc8 [A] #

1. ... fxg6 [b] 2. Qxg8 [B] #

1. ... f5 2. Se5#

Solution: 1. Kd2! waiting

1. ... Bh7 [a] 2. Qc8 [A] #

1. ... fxg6 [b] 2. Qxg8 [B] #

1. ... f5 2. Se5#

1. ... d3 2. Se3#

Here we have a mutate or changed mate. White has set replies provided for all of Black’s moves in the initial position, but a waiting key changes the white response to at least one of these black moves.

81-Problem Solution.

Solution: 1. Be6! waiting
1. ... Ra7/a8/a5 2. Bxb6#
1. ... Sc8 [a] /e8/b7/f7/f5/c4 [b] /e4 2. Sxb5 [A] #
1. ... e4 2. Bf6#
Here we have a Mate Transference type of changed play seen in direct mates, where the same white mating move occurs over two phases of play, but is induced by different black moves. A white mate is thus ‘transferred’ from one black defense to another.

80-Problem Solution

Solution: 1. Bb8-g3! threat 2. Bg3-e1#
1. ... d4-d3 2. Bg3-e5+
2. ... Rd7-d4 3. Rg7-c7#

Basically this is a decoy theme with some strategy.

79-Problem Solution (Mate in Two)

Solution: 1. Bg2! waiting
1. ... Ra7/a8/a5 2. Bxb6#
1. ... Sc8/e8/b7/f7/f5/c4/e4 2. Sxb5#
1. ... e4 2. Bf6#

Black is in a position of zugzwang, where every move leads to a mate. White must do a WAITING move.

78-Problem Solution (Mate in 3)

Solution: 1. Qf4! [2. Qc4, Qb4, Qxe3#]
1. ... Bd4 2. Qxd2 [3. Qb4#]
2. ... Bc3+ 3. Qxc3#
1. ... Bxf4 2. Bf2+
2. ... Be3 3. Bxe3#

White Queen sacrifice will defeat Black defenses.

77-Chess Problem Solution

Solution: 1. Sg5-e4! threat 2. Rb6-d6#
1. ... Rf5-f6 2. Se4xf6#
1. ... Rf5xf4+ 2. Sh3xf4#
1. ... Sg3xe4 2. d3xe4#

This problem includes a cross-check.