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Problem Display

PID: 272416 (8/5NbB/1p2p1P1/pQ1ppkB1/R5p1/pN1P2p1/K5P1/8 w - - 0 1)

Powell, P

The Problemist, 1957

8/5NbB/1p2p1P1/pQ1ppkB1/R5p1/pN1P2p1/K5P1/8

#2

10 + 10

SOLUTION

SOUND
Sets
- 1...Bf6
  - 2.g7#
- 1...Bh6
  - 2.g7#
- 1...Bf8
  - 2.g7#
- 1...Bh8
  - 2.g7#
- 1...d4
  - 2.Sxd4#
- 1...e4
  - 2.dxe4#
Tries
- 1.Kb1?
  - 1...Bf6
    - 2.g7#
  - 1...Bh6
    - 2.g7#
  - 1...Bf8
    - 2.g7#
  - 1...Bh8
    - 2.g7#
  - 1...d4
    - 2.Sxd4#
  - 1...e4
    - 2.dxe4#
  - 1...a2+!
- 1.Kxa3?
  - 1...Bf6
    - 2.g7#
  - 1...Bh6
    - 2.g7#
  - 1...Bh8
    - 2.g7#
  - 1...d4
    - 2.Sxd4#
  - 1...e4
    - 2.dxe4#
  - 1...Bf8+!
- 1.Sa1?
  - 1...Bf6
    - 2.g7#
  - 1...Bh6
    - 2.g7#
  - 1...Bf8
    - 2.g7#
  - 1...Bh8
    - 2.g7#
  - 1...e4
    - 2.dxe4#
  - 1...d4!
- 1.Sc1?
  - 1...Bf6
    - 2.g7#
  - 1...Bh6
    - 2.g7#
  - 1...Bf8
    - 2.g7#
  - 1...Bh8
    - 2.g7#
  - 1...e4
    - 2.dxe4#
  - 1...d4!
- 1.Sd2?
  - 1...Bf6
    - 2.g7#
  - 1...Bh6
    - 2.g7#
  - 1...Bf8
    - 2.g7#
  - 1...Bh8
    - 2.g7#
  - 1...e4
    - 2.dxe4#
  - 1...d4!
- 1.Rc4?
  - 1...dxc4
    - 2.Sd4#
  - 1...d4
    - 2.Sxd4#
  - 1...Bf6
    - 2.g7#
  - 1...Bh6
    - 2.g7#
  - 1...Bf8
    - 2.g7#
  - 1...Bh8
    - 2.g7#
  - 1...e4
    - 2.dxe4#
  - 1...a4!
- 1.Re4?
  - 1...dxe4
    - 2.Sd4#
  - 1...d4
    - 2.Sxd4#
    - 2.Rf4#
  - 1...Bf6
    - 2.g7#
  - 1...Bh6
    - 2.Rxe5#
    - 2.g7#
  - 1...Bf8
    - 2.Rxe5#
    - 2.g7#
  - 1...Bh8
    - 2.g7#
  - 1...a4!
Keys
- 1.d4!
  - 1...Ke4
    - 2.Sd6#
  - 1...exd4
    - 2.Qd3#
  - 1...Bf6
    - 2.g7#
  - 1...Bh6
    - 2.g7#
  - 1...Bf8
    - 2.g7#
  - 1...Bh8
    - 2.g7#
  - 1...e4
    - 2.Qf1#

FEATURES

Static
- TYPE = MUTATE
- CHANGED MATES = 1
- ADDED MATES = 2
- REMOVED MATES = 1
Sets
- B(j);OGATE::B(J)+P(H)
- P(e);P_SPINP(f)::S(C),XP(e)
- P(f);OGATE,P_SPINP(e)::P(D),XP(f)
Tries
- Try
  - K(A);S_FLIGHT
  - Vars
    - B(j);OGATE::B(J)+P(H)
    - P(e);P_SPINP(f)::S(C),XP(e)
    - P(f);OGATE,P_SPINP(e)::P(D),XP(f)
  - Refutation
    - P(a);CHECK
- Try
  - K(A);P-FLIGHT,XP(a)
  - Vars
    - B(j);OGATE::B(J)+P(H)
    - P(e);P_SPINP(f)::S(C),XP(e)
    - P(f);OGATE,P_SPINP(e)::P(D),XP(f)
  - Refutation
    - B(j);CHECK
- Try
  - S(C);
  - Vars
    - B(j);OGATE::B(J)+P(H)
    - P(f);OGATE,P_SPINP(e)::P(D),XP(f)
  - Refutation
    - P(e);P_SPINP(f)
- Try
  - S(C);
  - Vars
    - B(j);OGATE::B(J)+P(H)
    - P(f);OGATE,P_SPINP(e)::P(D),XP(f)
  - Refutation
    - P(e);P_SPINP(f)
- Try
  - S(C);
  - Vars
    - B(j);OGATE::B(J)+P(H)
    - P(f);OGATE,P_SPINP(e)::P(D),XP(f)
  - Refutation
    - P(e);P_SPINP(f)
- Try
  - R(E);
  - Vars
    - P(e);P_SPINP(f),XR(E)::S(C)
    - P(e);P_SPINP(f)::S(C),XP(e)
    - B(j);OGATE::B(J)+P(H)
    - P(f);OGATE,P_SPINP(e)::P(D),XP(f)
  - Refutation
    - P(d);
- Try
  - R(E);
  - Vars
    - P(e);P_SPINP(f),XR(E)::S(C)
    - B(j);OGATE::B(J)+P(H)
  - Refutation
    - P(d);
Actual
- P(D);
- Vars
  - K(g);N_GUARD,S_FLIGHT::S(I)
  - P(f);N_GUARD,P_SPINP(e),XP(D)::QAB(F)
  - B(j);OGATE::B(J)+P(H)
  - P(f);P_SPINP(e),SBLOCK::QAR(F)

Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).