MESON Chess Problem Database

Problem Display
PID: 261925 (6kq/4Q1pR/8/6K1/4N3/8/8/8 w - - 0 1)

Poulsen, Erik

Problemnoter, 1956

6kq/4Q1pR/8/6K1/4N3/8/8/8

#2

4 + 3

3713 Snap 2022
6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kxh7
      • 2.Sf6#
    • 1...Qxh7
      • 2.Qe8#
    • 1...g6
      • 2.Qf7#
  • Tries
    • 1.Kg4?
      • 1...Qxh7
        • 2.Qe8#
      • 1...g5
        • 2.Qf7#
      • 1...g6
        • 2.Qf7#
      • 1...Kxh7!
    • 1.Sd2?
      • 1...Qxh7
        • 2.Qe8#
      • 1...g6
        • 2.Qf7#
      • 1...Kxh7!
    • 1.Sf2?
      • 1...Qxh7
        • 2.Qe8#
      • 1...g6
        • 2.Qf7#
      • 1...Kxh7!
    • 1.Sc3?
      • 1...Qxh7
        • 2.Qe8#
      • 1...g6
        • 2.Qf7#
      • 1...Kxh7!
    • 1.Sg3?
      • 1...Qxh7
        • 2.Qe8#
      • 1...g6
        • 2.Qf7#
      • 1...Kxh7!
    • 1.Sc5?
      • 1...Qxh7
        • 2.Qe8#
      • 1...g6
        • 2.Qf7#
      • 1...Kxh7!
    • 1.Sd6?
      • 1...Qxh7
        • 2.Qd8#
        • 2.Qe8#
      • 1...g6
        • 2.Qf7#
      • 1...Kxh7!
    • 1.Qe6+?
      • 1...Kf8
        • 2.Rxh8#
      • 1...Kxh7!
    • 1.Qa7?
      • 1...Kxh7
        • 2.Sf6#
      • 1...Kf8
        • 2.Rxh8#
      • 1...g6
        • 2.Qf7#
      • 1...Qxh7!
    • 1.Qb7?
      • 1...Kxh7
        • 2.Sf6#
      • 1...Kf8
        • 2.Rxh8#
      • 1...g6
        • 2.Qf7#
      • 1...Qxh7!
    • 1.Qc7?
      • 1...Kxh7
        • 2.Sf6#
      • 1...Kf8
        • 2.Rxh8#
      • 1...g6
        • 2.Qf7#
      • 1...Qxh7!
    • 1.Qf7+?
      • 1...Kxh7
        • 2.Sf6#
      • 1...Kxf7!
  • Keys
    • 1.Qd7!
      • 1...Kxh7
        • 2.Sf6#
      • 1...Kf8
        • 2.Rxh8#
      • 1...Qxh7
        • 2.Qe8#
      • 1...g6
        • 2.Qf7#

Anticipated by 38470(1925)

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(b);P_SPINP(a),S_FLIGHT,XR(D)::S(A)
    • Q(c);SBLOCK,XR(D)::QAR2(C)
    • P(a);::QAB1(C)
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Vars
        • Q(c);SBLOCK,XR(D)::QAR2(C)
        • P(a);::QAB1(C)
      • Refutation
        • K(b);P_SPINP(a),S_FLIGHT,XR(D)
    • Try
      • S(A);
      • Vars
        • Q(c);SBLOCK,XR(D)::QAR2(C)
        • P(a);::QAB1(C)
      • Refutation
        • K(b);P_SPINP(a),S_FLIGHT,XR(D)
    • Try
      • S(A);
      • Vars
        • Q(c);SBLOCK,XR(D)::QAR2(C)
        • P(a);::QAB1(C)
      • Refutation
        • K(b);P_SPINP(a),S_FLIGHT,XR(D)
    • Try
      • S(A);
      • Vars
        • Q(c);SBLOCK,XR(D)::QAR2(C)
        • P(a);::QAB1(C)
      • Refutation
        • K(b);P_SPINP(a),S_FLIGHT,XR(D)
    • Try
      • S(A);
      • Vars
        • Q(c);SBLOCK,XR(D)::QAR2(C)
        • P(a);::QAB1(C)
      • Refutation
        • K(b);P_SPINP(a),S_FLIGHT,XR(D)
    • Try
      • S(A);
      • Vars
        • Q(c);SBLOCK,XR(D)::QAR2(C)
        • P(a);::QAB1(C)
      • Refutation
        • K(b);P_SPINP(a),S_FLIGHT,XR(D)
    • Try
      • S(A);
      • Vars
        • P(a);::QAB1(C)
      • Refutation
        • K(b);P_SPINP(a),S_FLIGHT,XR(D)
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);N_GUARD,P-FLIGHT::R(D),XQ(c)
      • Refutation
        • K(b);S_FLIGHT,XR(D)
    • Try
      • Q(C);
      • Vars
        • K(b);N_GUARD,P_SPINP(a),S_FLIGHT,XR(D)::S(A)
        • K(b);N_GUARD,P-FLIGHT::R(D),XQ(c)
        • P(a);::QAB1(C)
      • Refutation
        • Q(c);XR(D)
    • Try
      • Q(C);
      • Vars
        • K(b);N_GUARD,P_SPINP(a),S_FLIGHT,XR(D)::S(A)
        • K(b);N_GUARD,P-FLIGHT::R(D),XQ(c)
        • P(a);::QAB1(C)
      • Refutation
        • Q(c);XR(D)
    • Try
      • Q(C);
      • Vars
        • K(b);N_GUARD,P_SPINP(a),S_FLIGHT,XR(D)::S(A)
        • K(b);N_GUARD,P-FLIGHT::R(D),XQ(c)
        • P(a);::QAB1(C)
      • Refutation
        • Q(c);XR(D)
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);N_GUARD,P_SPINP(a),S_FLIGHT,XR(D)::S(A)
      • Refutation
        • K(b);P_SPINP(a),S_FLIGHT,XQ(C)
  • Actual
    • Q(C);
    • Vars
      • K(b);N_GUARD,P_SPINP(a),S_FLIGHT,XR(D)::S(A)
      • K(b);N_GUARD,P-FLIGHT::R(D),XQ(c)
      • Q(c);SBLOCK,XR(D)::QAR2(C)
      • P(a);::QAB1(C)
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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).