MESON Chess Problem Database

Problem Display
PID: 239514 (2R1n3/4k3/1P2P3/7N/2B5/8/1K6/Q7 w - - 0 1)

Hermanson, Halvar

Magyar Sakkelet, 1962

2R1n3/4k3/1P2P3/7N/2B5/8/1K6/Q7

#2

7 + 2

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sf6
      • 2.Qa3#
    • 1...Sc7
      • 2.Qa3#
    • 1...Sg7
      • 2.Qa3#
  • Tries
    • 1.Kb1?
      • 1...Kf8
        • 2.Qg7#
      • 1...Sd6
        • 2.Qf6#
      • 1...Sf6
        • 2.Qa3#
      • 1...Sc7
        • 2.Qa3#
      • 1...Sg7
        • 2.Qa3#
      • 1...Kd6!
    • 1.Kc1?
      • 1...Kf8
        • 2.Qg7#
      • 1...Sd6
        • 2.Qf6#
      • 1...Sf6
        • 2.Qa3#
      • 1...Sc7
        • 2.Qa3#
      • 1...Sg7
        • 2.Qa3#
      • 1...Kd6!
    • 1.Kc2?
      • 1...Kf8
        • 2.Qg7#
      • 1...Sd6
        • 2.Qf6#
      • 1...Sf6
        • 2.Qa3#
      • 1...Sc7
        • 2.Qa3#
      • 1...Sg7
        • 2.Qa3#
      • 1...Kd6!
    • 1.Kb3?
      • 1...Kf8
        • 2.Qg7#
      • 1...Sf6
        • 2.Qa3#
      • 1...Sd6
        • 2.Qf6#
      • 1...Sc7
        • 2.Qa3#
      • 1...Sg7
        • 2.Qa3#
      • 1...Kd6!
    • 1.Qe1?
      • 1...Kf8
        • 2.e7#
      • 1...Sf6
        • 2.Qb4#
      • 1...Sd6
        • 2.Qh4#
      • 1...Sc7
        • 2.Qb4#
      • 1...Sg7
        • 2.Qb4#
      • 1...Kd6!
    • 1.Qa4?
      • 1...Kf8
        • 2.Rxe8#
        • 2.Qxe8#
      • 1...Sf6
        • 2.Qa3#
        • 2.Qb4#
      • 1...Sd6
        • 2.Qd7#
      • 1...Sc7
        • 2.Qd7#
        • 2.Qa3#
        • 2.Qb4#
      • 1...Sg7
        • 2.Qd7#
        • 2.Qa3#
        • 2.Qb4#
      • 1...Kd6!
    • 1.Qa5?
      • 1...Kd6
        • 2.Qc5#
      • 1...Sf6
        • 2.Qb4#
        • 2.Qa3#
        • 2.Qc5#
      • 1...Sd6
        • 2.Qg5#
      • 1...Sc7
        • 2.Qb4#
        • 2.Qa3#
        • 2.Qc5#
      • 1...Sg7
        • 2.Qb4#
        • 2.Qa3#
        • 2.Qc5#
      • 1...Kf8!
    • 1.Qa7+?
      • 1...Kf8
        • 2.Qf7#
        • 2.Qg7#
        • 2.e7#
      • 1...Sc7
        • 2.Qa3#
        • 2.Qxc7#
      • 1...Kd6!
    • 1.Qa8?
      • 1...Kf8
        • 2.Rxe8#
      • 1...Sf6
        • 2.Qa3#
      • 1...Sd6
        • 2.Rc7#
      • 1...Sc7
        • 2.Qa3#
      • 1...Sg7
        • 2.Qa3#
      • 1...Kd6!
  • Keys
    • 1.Qg1!
      • 1...Kd6
        • 2.Qc5#
      • 1...Kf8
        • 2.Qg7#
      • 1...Sf6
        • 2.Qc5#
      • 1...Sd6
        • 2.Qg5#
      • 1...Sc7
        • 2.Qc5#
      • 1...Sg7
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 3
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(b);N_GUARD::QAB(A)
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Vars
        • K(a);P_SPINS(b),S_FLIGHT::QAB1(A)
        • S(b);N_GUARD,SBLOCK::QAB1(A)
        • S(b);N_GUARD::QAB(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • K(B);S_FLIGHT
      • Vars
        • K(a);P_SPINS(b),S_FLIGHT::QAB1(A)
        • S(b);N_GUARD,SBLOCK::QAB1(A)
        • S(b);N_GUARD::QAB(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • K(B);P-FLIGHT
      • Vars
        • K(a);P_SPINS(b),S_FLIGHT::QAB1(A)
        • S(b);N_GUARD,SBLOCK::QAB1(A)
        • S(b);N_GUARD::QAB(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • K(B);P-FLIGHT
      • Vars
        • K(a);P_SPINS(b),S_FLIGHT::QAB1(A)
        • S(b);N_GUARD::QAB(A)
        • S(b);N_GUARD,SBLOCK::QAB1(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(a);OGATE,P_SPINS(b),S_FLIGHT::P(F)
        • S(b);N_GUARD::QAB(A)
        • S(b);N_GUARD,SBLOCK::QAB(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • S(b);::QAR1(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(a);S_FLIGHT::QAB1(A)
        • S(b);N_GUARD,SBLOCK::QAB(A)
      • Refutation
        • K(a);P_SPINS(b),S_FLIGHT
    • Try
      • Q(A);CHECK
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(a);P_SPINS(b),S_FLIGHT::R1(G),XS(b)
        • S(b);N_GUARD::QAB(A)
        • S(b);N_GUARD,SBLOCK::R(G)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(A);
    • Vars
      • K(a);S_FLIGHT::QAB1(A)
      • K(a);P_SPINS(b),S_FLIGHT::QAB1(A)
      • S(b);N_GUARD::QAB(A)
      • S(b);N_GUARD,SBLOCK::QAB(A)
HTML5 logo

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).