Here are some chess problems composed by R Collinson.
White Mates in 3.

Solutions are between the brackets under each puzzle.
Drag your cursor from one bracket to the other.

a)
8/5K2/8/3k4/1B3p2/2Q5/6P1/8 w - - 0 1
[ Qc2 if Kd4 Ke6 or if f3 gxf3 or if Ke5 Qd3 ]

b)
3B4/8/4K3/2k5/3p4/1R1R4/8/8 w - - 0 1
[ Bh4 if Kc4 Bf2 or if Kc6 Rd1 ]

c)
8/p7/Q7/8/3kP3/B7/2K3P1/8 w - - 0 1
[ Bc1 if Kxe4 Qe6+ or if Ke5 Be3 or if Kc5 Bb2 ]

d)
8/7K/1B2p3/4P3/4Nk2/8/8/7Q w - - 0 1
[ Ng5 if Kxg5 (or Kf5) Qf3(+) or if Kxe5 Qe4+ or if Kg4 or Kg3 Be3 ]

e)
8/6Q1/8/4K1N1/6Bk/6N1/2P5/8 w - - 0 1
[ Qa7 if Kxg4 Qe3 or if Kxg3 Qg1+ or if Kxg5 Qg7+ ]

f)
8/6Q1/2k4K/7R/8/1B6/1P6/8 w - - 0 1
[ Rb5 if Kxb5 Qc7 or if Kd6 Rb6+ ]


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