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Problem Display

PID: 181320 (K7/8/2n3B1/8/Q7/8/pp6/k7 w - - 0 1)

Howard, David M

Problem Observer, 2014

K7/8/2n3B1/8/Q7/8/pp6/k7

#3

3 + 4

SOLUTION

SOUND
Sets
- 1...Sb4
  - 2.Bb1
    - 2...Kxb1
      - 3.Qd1#
    - 2...Sc2
      - 3.Qxa2#
    - 2...Sd3
      - 3.Qxa2#
    - 2...Sd5
      - 3.Qxa2#
    - 2...Sa6
      - 3.Qxa2#
    - 2...Sc6
      - 3.Qxa2#
- 1...Sd4
  - 2.Bb1
    - threat
      - 3.Qxa2#
    - 2...Kxb1
      - 3.Qd1#
- 1...Sa5
  - 2.Bb1
    - threat
      - 3.Qxa2#
    - 2...Kxb1
      - 3.Qd1#
- 1...Se5
  - 2.Bb1
    - threat
      - 3.Qxa2#
    - 2...Kxb1
      - 3.Qd1#
- 1...Sa7
  - 2.Bb1
    - threat
      - 3.Qxa2#
    - 2...Kxb1
      - 3.Qd1#
- 1...Se7
  - 2.Bb1
    - threat
      - 3.Qxa2#
    - 2...Kxb1
      - 3.Qd1#
- 1...Sb8
  - 2.Bb1
    - threat
      - 3.Qxa2#
    - 2...Kxb1
      - 3.Qd1#
- 1...Sd8
  - 2.Bb1
    - threat
      - 3.Qxa2#
    - 2...Kxb1
      - 3.Qd1#
Keys
- 1.Bb1!
  - threat
    - 2.Qxa2#
  - 1...Sb4
    - 2.Kb7
      - 2...Kxb1
        3.Qd1#
      - 2...Sc2
        3.Qxa2#
      - 2...Sd3
        3.Qxa2#
      - 2...Sd5
        3.Qxa2#
      - 2...Sa6
        3.Qxa2#
      - 2...Sc6
        3.Qxa2#

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