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Problem Display

PID: 213922 (2N5/1K1p2B1/P2p3p/2k1rp1r/1pB4p/3Ppn2/8/Q7 w - - 0 1)

Isaev, Leonid Antonovich

5th Prize, Osterreichische Arbeiter Schachbund, 1928

2N5/1K1p2B1/P2p3p/2k1rp1r/1pB4p/3Ppn2/8/Q7

#3

7 + 11

6490	yacpdb	2020

SOLUTION

SOUND
Sets
- 1...Re4
  - 2.Qa5#
- 1...Rd5
  - 2.Qa5#
- 1...Re6
  - 2.Qa5#
- 1...Re7
  - 2.Qa5#
- 1...Re8
  - 2.Qa5#
- 1...Sd4
  - 2.Qa5+
    - 2...Sb5
      - 3.Qb6#
Keys
- 1.Sxd6!
  - threat
    - 2.Bxe5
      - threat
        3.Qa5#
      - 2...Sxe5
        3.Qxe5#
      - 2...Sd4
        3.Qxd4#
  - 1...Kxd6
    - 2.Qxe5+
      - 2...Sxe5
        3.Bf8#
  - 1...b3
    - 2.Sb5
      - threat
        3.Qa3#
      - 2...Kb4
        3.Qa3#
    - 2.Qa3+
      - 2...Kd4
        3.Sb5#
  - 1...Re4
    - 2.Kc7
      - threat
        3.Sb7#
        3.Qa5#
    - 2.Qa5+
      - 2...Kxd6
        3.Qxb4#
  - 1...Rd5
    - 2.Kc7
      - threat
        3.Sb7#
        3.Qa5#
  - 1...Re6
    - 2.Kc7
      - threat
        3.Sb7#
        3.Qa5#
    - 2.Qa5+
      - 2...Kxd6
        3.Qxb4#
  - 1...Re7
    - 2.Kc7
      - threat
        3.Sb7#
        3.Qa5#
    - 2.Qa5+
      - 2...Kxd6
        3.Qxb4#
        3.Qb6#
        3.Qc7#
        3.Qd5#
  - 1...Re8
    - 2.Qa5+
      - 2...Kxd6
        3.Qxb4#
  - 1...Sd4
    - 2.Qa5+
      - 2...Kxd6
        3.Qxe5#
      - 2...Sb5
        3.Qb6#
  - 1...f4
    - 2.Bf8
      - threat
        3.Se4#
      - 2...Re4
        3.Sxe4#

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