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Problem Display

PID: 149101 (3QK3/1NNpP3/P1k1P3/Bp2n3/1P6/8/8/8 w - - 0 1)

Lewis, Brian Noel

British Chess Magazine, 1944

3QK3/1NNpP3/P1k1P3/Bp2n3/1P6/8/8/8

#2

9 + 4

SOLUTION

SOUND
Sets
- 1...Sd3
  - 2.Qxd7#
- 1...Sf3
  - 2.Qxd7#
- 1...Sc4
  - 2.Qxd7#
- 1...Sg4
  - 2.Qxd7#
- 1...Sg6
  - 2.Qxd7#
- 1...Sf7
  - 2.Qxd7#
- 1...dxe6
  - 2.Qd6#
- 1...d5
  - 2.Qxd5#
  - 2.Qd6#
- 1...d6
  - 2.Qxd6#
Tries
- 1.Kf8?
  - 1...dxe6
    - 2.Qd6#
  - 1...Sd3
    - 2.Qxd7#
  - 1...Sf3
    - 2.Qxd7#
  - 1...Sc4
    - 2.Qxd7#
  - 1...Sg4
    - 2.Qxd7#
  - 1...Sf7
    - 2.Qxd7#
  - 1...d5
    - 2.Qxd5#
    - 2.Qd6#
  - 1...d6
    - 2.Qxd6#
  - 1...Sg6+!
- 1.Sd5?
  - 1...dxe6
    - 2.Qd6#
  - 1...Sd3
    - 2.Qxd7#
  - 1...Sf3
    - 2.Qxd7#
  - 1...Sc4
    - 2.Qxd7#
  - 1...Sg4
    - 2.Qxd7#
  - 1...Sg6
    - 2.Qxd7#
  - 1...Sf7
    - 2.Qxd7#
  - 1...d6
    - 2.Qxd6#
  - 1...Kxd5!
- 1.Sa8?
  - 1...dxe6
    - 2.Qd6#
  - 1...Sd3
    - 2.Qxd7#
  - 1...Sf3
    - 2.Qxd7#
  - 1...Sc4
    - 2.Qxd7#
  - 1...Sg4
    - 2.Qxd7#
  - 1...Sg6
    - 2.Qxd7#
  - 1...Sf7
    - 2.Qxd7#
  - 1...d5
    - 2.Qb6#
    - 2.Qc7#
    - 2.Qd6#
    - 2.Qc8#
  - 1...d6
    - 2.Qxd6#
  - 1...Kd5!
Keys
- 1.Qc8!
  - 1...dxe6
    - 2.Qxe6#
  - 1...Sd3
    - 2.Qxd7#
  - 1...Sf3
    - 2.Qxd7#
  - 1...Sc4
    - 2.Qxd7#
  - 1...Sg4
    - 2.Qxd7#
  - 1...Sg6
    - 2.Qxd7#
  - 1...Sf7
    - 2.Qxd7#
  - 1...d5
    - 2.Sa8#
  - 1...d6
    - 2.Sd8#

Problem 6450, July, 1944.

FEATURES

Static
- TYPE = MUTATE
- CHANGED MATES = 2
- ADDED MATES = 1
- REMOVED MATES = 0
Sets
- S(b);N_GUARD::QAB1(H),XP(d)
- P(d);OGATE,XP(D)::QAR1(H)
- P(d);OGATE::QAR1(H),XP(d)
Tries
- Try
  - K(I);P-FLIGHT
  - Vars
    - P(d);OGATE,XP(D)::QAR1(H)
    - S(b);N_GUARD::QAB1(H),XP(d)
    - P(d);OGATE::QAR1(H),XP(d)
  - Refutation
    - S(b);CHECK
- Try
  - S(F);
  - Vars
    - P(d);OGATE,XP(D)::QAR1(H)
    - S(b);N_GUARD::QAB1(H),XP(d)
    - P(d);OGATE::QAR1(H),XP(d)
  - Refutation
    - K(c);P_SPINP(d),S_FLIGHT,XS(F)
- Try
  - S(F);
  - Vars
    - P(d);OGATE,XP(D)::QAR1(H)
    - S(b);N_GUARD::QAB1(H),XP(d)
    - P(d);OGATE::QAR1(H),XP(d)
  - Refutation
    - K(c);P_SPINP(d),S_FLIGHT
Actual
- Q(H);
- Vars
  - P(d);OGATE,XP(D)::QAR2(H),XP(d)
  - S(b);N_GUARD::QAB1(H),XP(d)
  - P(d);SBLOCK::QAR(H)+S(F)
  - P(d);SBLOCK::S(E)

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