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Problem Display

PID: 257496 (8/3p4/1PRp4/2pk4/P1N1nR2/K3P3/8/Q7 w - - 0 1)

Voigt, Hans

Wiener Schachzeitung, 1935

8/3p4/1PRp4/2pk4/P1N1nR2/K3P3/8/Q7

#2

8 + 5

15601	Albrecht-Leiss-Degener Collection	2022

SOLUTION

SOUND
Sets
- 1...Kxc4
  - 2.Qd4#
- 1...Ke6
  - 2.Qe5#
- 1...Sd2
  - 2.Rxd6#
- 1...Sf2
  - 2.Rxd6#
- 1...Sc3
  - 2.Rxd6#
- 1...Sg3
  - 2.Rxd6#
- 1...Sg5
  - 2.Rxd6#
- 1...Sf6
  - 2.Rxd6#
Tries
- 1.Rf5+?
  - 1...Kxc4
    - 2.Qd4#
  - 1...Ke6
    - 2.Qe5#
  - 1...Kxc6!
- 1.Rxd6+?
  - 1...Kxc4
    - 2.Rxe4#
    - 2.Qc1#
  - 1...Sxd6!
- 1.Qf6?
  - 1...Kxc4
    - 2.Qd4#
  - 1...Sxf6
    - 2.Rxd6#
  - 1...dxc6
    - 2.Qf7#
  - 1...Sd2
    - 2.Rxd6#
    - 2.Qxd6#
  - 1...Sf2
    - 2.Rxd6#
    - 2.Qxd6#
  - 1...Sc3
    - 2.Rxd6#
    - 2.Qxd6#
  - 1...Sg3
    - 2.Rxd6#
    - 2.Qxd6#
  - 1...Sg5
    - 2.Rxd6#
    - 2.Qxd6#
  - 1...Kxc6!
- 1.Qg7?
  - 1...Kxc4
    - 2.Qd4#
  - 1...Ke6
    - 2.Qe5#
    - 2.Qf7#
  - 1...dxc6
    - 2.Qf7#
    - 2.Qg8#
  - 1...Sd2
    - 2.Rxd6#
  - 1...Sf2
    - 2.Rxd6#
  - 1...Sc3
    - 2.Rxd6#
  - 1...Sg3
    - 2.Rxd6#
  - 1...Sg5
    - 2.Rxd6#
  - 1...Sf6
    - 2.Rxd6#
  - 1...Kxc6!
- 1.Qb1?
  - threat
    - 2.Qxe4#
  - 1...Kxc4
    - 2.Qb3#
  - 1...Ke6
    - 2.Qxe4#
  - 1...Sd2
    - 2.Rxd6#
  - 1...Sf2
    - 2.Rxd6#
  - 1...Sc3
    - 2.Rxd6#
  - 1...Sg3
    - 2.Rxd6#
  - 1...Sg5
    - 2.Rxd6#
  - 1...Sf6
    - 2.Rxd6#
  - 1...Kxc6!
Keys
- 1.Qh8!
  - 1...Kxc4
    - 2.Qd4#
  - 1...Kxc6
    - 2.Qa8#
  - 1...Ke6
    - 2.Qe5#
  - 1...dxc6
    - 2.Qg8#
  - 1...Sd2
    - 2.Rxd6#
  - 1...Sf2
    - 2.Rxd6#
  - 1...Sc3
    - 2.Rxd6#
  - 1...Sg3
    - 2.Rxd6#
  - 1...Sg5
    - 2.Rxd6#
  - 1...Sf6
    - 2.Rxd6#

FEATURES

Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 0
Sets
- K(c);N_GUARD,P_SPINP(b),P_SPINS(a),S_FLIGHT,XS(E)::QAR1(A)
- K(c);N_GUARD,P_SPINP(d),S_FLIGHT::QAR1(A)
- S(a);N_GUARD::R1(H),XP(d)
Tries
- Try
  - R(F);CHECK
  - Vars
    - K(c);N_GUARD,P_SPINP(b),S_FLIGHT,XS(E)::QAR1(A)
    - K(c);N_GUARD,P_SPINP(d),S_FLIGHT::QAR1(A)
  - Refutation
    - K(c);S_FLIGHT,XR(H)
- Try
  - R(H);CHECK,XP(d)
  - Refutation
    - S(a);XR(H)
- Try
  - Q(A);
  - Vars
    - K(c);N_GUARD,P_SPINP(b),P_SPINS(a),S_FLIGHT,XS(E)::QAR1(A)
    - S(a);N_GUARD,XQ(A)::R1(H),XP(d)
    - P(e);SBLOCK,XR(H)::QAB(A)
  - Refutation
    - K(c);P_SPINP(d),S_FLIGHT,XR(H)
- Try
  - Q(A);
  - Vars
    - K(c);N_GUARD,P_SPINP(b),P_SPINS(a),S_FLIGHT,XS(E)::QAR1(A)
    - S(a);N_GUARD::R1(H),XP(d)
  - Refutation
    - K(c);S_FLIGHT,XR(H)
- Try
  - Q(A);
  - Threat
    - QAB1(A),XS(a)
  - Vars
    - K(c);OGATEB,P_SPINP(b),P_SPINS(a),S_FLIGHT,XS(E)::QAB1(A)
    - K(c);P_SPINP(d),S_FLIGHT::QAR2(A),XS(a)
    - S(a);N_GUARD::R1(H),XP(d)
  - Refutation
    - K(c);S_FLIGHT,XR(H)
Actual
- Q(A);
- Vars
  - K(c);N_GUARD,P_SPINP(b),P_SPINS(a),S_FLIGHT,XS(E)::QAR1(A)
  - K(c);OGATEB,S_FLIGHT,XR(H)::QAB(A)
  - K(c);N_GUARD,P_SPINP(d),S_FLIGHT::QAR1(A)
  - P(e);SBLOCK,XR(H)::QAB(A)
  - S(a);N_GUARD::R1(H),XP(d)

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).