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Problem Display

PID: 261257 (8/8/PkN5/4Q3/p7/8/K7/8 w - - 0 1)

Kozhakin, Vladimir Vladimirovich

Schweizerische Schachzeitung, 2007

8/8/PkN5/4Q3/p7/8/K7/8

#3

4 + 2

SOLUTION

SOUND
Tries
- 1.Sb4?
  - 1...Ka7
    - 2.Qc7+
      - 2...Ka8
        3.Qb7#
    - 2.Qb5
      - threat
        3.Qb7#
      - 2...Ka8
        3.Qb7#
  - 1...a3!
- 1.Sb8?
  - 1...Ka7
    - 2.Qb2
      - threat
        3.Qb7#
      - 2...Ka8
        3.Qb7#
    - 2.Qc7+
      - 2...Ka8
        3.Qb7#
    - 2.Qb5
      - threat
        3.Qb7#
      - 2...Ka8
        3.Qb7#
  - 1...a3!
Keys
- 1.a7!
  - threat
    - 2.a8Q
      - 2...a3
        3.Qea5#
    - 2.a8B
      - threat
        3.Qa5#
      - 2...Ka6
        3.Qa5#
  - 1...Ka6
    - 2.Qb2
      - 2...a3
        3.a8Q#
        3.a8R#
    - 2.Qb8
      - 2...a3
        3.a8Q#
        3.a8R#
    - 2.Qa5+
      - 2...Kb7
        3.a8Q#
    - 2.a8Q+
      - 2...Kb6
        3.Qea5#
    - 2.a8B
      - threat
        3.Qa5#
      - 2...Kb6
        3.Qa5#
  - 1...Kxc6
    - 2.a8Q+
      - 2...Kb6
        3.Qea5#
      - 2...Kd7
        3.Qae8#
  - 1...Kb7
    - 2.a8Q+
      - 2...Kb6
        3.Qea5#
      - 2...Kxa8
        3.Qb8#
  - 1...a3
    - 2.a8B
      - 2...Ka6
        3.Qa5#

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