MESON Chess Problem Database

Problem Display
PID: 203780 (8/nkPP4/2p5/Q1K5/8/8/8/8 w - - 0 1)

Szentgyorgy, Erno

Magyar Sakkvilag, 1926

8/nkPP4/2p5/Q1K5/8/8/8/8

#2

4 + 3

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ka8
      • 2.c8Q#
    • 1...Sb5
      • 2.c8Q#
    • 1...Sc8
      • 2.d8S#
  • Tries
    • 1.Kb4?
      • 1...Ka8
        • 2.c8Q#
      • 1...Sb5
        • 2.c8Q#
      • 1...Sc8
        • 2.d8S#
      • 1...c5+!
    • 1.Kc4?
      • 1...Ka8
        • 2.c8Q#
      • 1...Sb5
        • 2.c8Q#
      • 1...Sc8
        • 2.d8S#
      • 1...c5!
    • 1.d8S+?
      • 1...Ka8
        • 2.c8Q#
        • 2.c8R#
      • 1...Kc8!
  • Keys
    • 1.Qb6+!
      • 1...Ka8
        • 2.Qb8#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 2
  • Sets
    • K(c);P_SPINS(b),S_FLIGHT::P=Q
    • S(b);N_GUARD::P=Q
    • S(b);SBLOCK::P=S
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Vars
        • K(c);P_SPINS(b),S_FLIGHT::P=Q
        • S(b);N_GUARD::P=Q
        • S(b);SBLOCK::P=S
      • Refutation
        • P(a);CHECK
    • Try
      • K(B);P-FLIGHT
      • Vars
        • K(c);P_SPINS(b),S_FLIGHT::P=Q
        • S(b);N_GUARD::P=Q
        • S(b);SBLOCK::P=S
      • Refutation
        • P(a);
    • Try
      • P(D);CHECK
      • Vars
        • K(c);P_SPINS(b),S_FLIGHT::P=Q
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • Q(A);CHECK
    • Vars
      • K(c);OGATE,S_FLIGHT::QAR1(A)
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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).