MESON Chess Problem Database

Problem Display
PID: 12109 (8/Q5P1/8/n7/2p5/8/P1K5/k7 w - - 0 1)

Froberg, Johan Hilding Laurentius

Tidskrift for Schack, 1974

8/Q5P1/8/n7/2p5/8/P1K5/k7

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Kxa2
      • 2.Qxa5#
    • 1...Sb3
      • 2.axb3#
  • Tries
    • 1.Qd4+?
      • 1...Kxa2
        • 2.Qb2#
      • 1...c3!
    • 1.Qb6?
      • threat
        • 2.Qb1#
        • 2.Qb2#
      • 1...Kxa2
        • 2.Qxa5#
        • 2.Qb2#
      • 1...c3
        • 2.Qb1#
      • 1...Sb3!
    • 1.g8R?
      • 1...Kxa2
        • 2.Qxa5#
      • 1...Sb3
        • 2.axb3#
      • 1...Sc6
        • 2.Rg1#
      • 1...Sb7
        • 2.Rg1#
      • 1...c3!
  • Keys
    • 1.g8Q!
      • 1...Kxa2
        • 2.Qxa5#
      • 1...Sb3
        • 2.axb3#
      • 1...Sc6
        • 2.Qgg1#
      • 1...Sb7
        • 2.Qgg1#
      • 1...c3
        • 2.Qag1#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(a);OGATEB,P-FLIGHT,P_SPINS(c),XP(A)::QAR(C),XS(c)
    • S(c);OGATE::QAR(C)+P(A),XS(c)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);P-FLIGHT,XP(A)::QAR1(C)
      • Refutation
        • P(b);P_SPINP(b)
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • P(b);::QAR1(C)
      • Refutation
        • S(c);
    • Try
      • P(D);
      • Vars
        • K(a);OGATEB,P-FLIGHT,P_SPINS(c),XP(A)::QAR(C),XS(c)
        • S(c);OGATE::QAR(C)+P(A),XS(c)
        • S(c);::R(D)
      • Refutation
        • P(b);
  • Actual
    • P(D);
    • Vars
      • K(a);OGATEB,P-FLIGHT,P_SPINP(b),P_SPINS(c),XP(A)::QAR(C),XS(c)
      • S(c);OGATE::QAR(C)+P(A),XS(c)
      • S(c);::QAR(D)
      • P(b);::QAR(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).