120-Mate in 3 SOLUTION.

Solution: 1. Sf5! [2. Bd6#]
 1. ... Bxf5 2. Rxf5 waiting move
    2. ... Kd4 3. Bf2#

119-Selfmate in 3 moves Solution

Solution: 1. Be6! [2. Sh8 [3. Bb3 ... Bxb3#]
    2. ... Bf7 3. Bb3 ... Bxb3#
    2. ... b4 3. Bb3 ... Bxb3#]
 1. ... b4 2. Sd8 [3. Bb3 ... Bxb3#]
    2. ... Bf7 3. Bb3 ... Bxb3#
    2. ... Bxe6+ 3. Sxe6 ... b3#
    2. ... b3+ 3. Bxb3 ... Bxb3#
 1. ... b4 2. Sh8 [3. Bb3 ... Bxb3#]
    2. ... Bf7 3. Bb3 ... Bxb3#
    2. ... b3+ 3. Bxb3 ... Bxb3#
  SELFMATE is a type of problem where white forces black to mate him against black's will within a specified number of moves.

118-Solution problem mate in two

Solution: 1. Rf3-f6! threat 2. Rf6-c6#
 1. ... Re8-c8, Bg8-e6 2. Sg6xe5#
 1. ... Re8-e6, Bg8-d5 2. Bh1(x)d5#

 Grimshaw is the name of this theme in which two pieces of the same colour (usually a rook and a bishop) interfere with each others line of action, by playing in turn to a square where the two lines intersect.

117-Problem Solution

Solution: 1. Kd1-c2! waiting
 1. ... Kd5-c4 2. Bg6-f7#
 1. ... Kd5-c6 2. Bg6-e4#
 1. ... Kd5-e6 2. Se2-f4#
 In this problem Black king has three flying squares.

116-Problem Solution

Solution: 1. Kb2-c2! waiting
 1. ... e4-e3 2. d2xe3+
    2. ... Rd3-c3+ 3. Be1xc3#
    2. ... Rd3 ad lib 3. Be1xd2#
 1. ... Rd3xb3 2. d2-d3+
    2. ... Rb3-c3+ 3. Be1xc3#
Crosschecks are the theme here.

155-Chess Problem Solution.

Solution: 1. Sg4-e5! threat 2. Sh3-f4 [A] , Bb1-e4 [B] #
 1. ... Bb8-d6 [d] , Rd8-d6, Re7xe5, Sh4xf3, Bh1xf3 2. Sh3-f4 [A] #
 1. ... Bb8xe5 [e] , Rd8-f8, Re7-f7, g7-g5 [c] , Sh4-g6/g2 2. Bb1-e4 [B] #
White sacrifice and mutual black interferences.  

114-Problem Solution.

Solution: 1. Ba7-b8! threat 2. Bb8xd6#
 1. ... Bf7xc4+ 2. Rc2xc4#
 1. ... Sf6-e8/xe4 2. Sf8-d7#
 1. ... Rg5-d5+ 2. c4xd5#


Set Play:
 1. ... Bf7 ad lib 2. Sf8(x)e6#
 1. ... Bf7-d5, d6-d5, Rg5-d5+ 2. c4xd5#
 1. ... Bf7xc4+ 2. Rc2xc4#
 1. ... Sf6 ad lib 2. Sf8(x)d7#
 1. ... Sf6-d5 2. Sf8-d7, c4xd5#