MESON Chess Problem Database

Problem Display
PID: 231455 (8/8/4pQ2/1K1kPN2/8/6N1/8/8 w - - 0 1)

Szentgyorgy, Erno

Magyar Sakkvilag, 1927

8/8/4pQ2/1K1kPN2/8/6N1/8/8

#2

5 + 2

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...exf5
      • 2.Qd6#
  • Tries
    • 1.Kb4?
      • 1...exf5
        • 2.Qd6#
      • 1...Kc6!
    • 1.Qh4?
      • threat
        • 2.Qd4#
        • 2.Qe4#
      • 1...Kxe5
        • 2.Qd4#
      • 1...exf5!
    • 1.Qe7?
      • threat
        • 2.Qc5#
        • 2.Qd6#
      • 1...exf5
        • 2.Qd6#
      • 1...Kxe5!
    • 1.Qg6?
      • 1...exf5
        • 2.Qd6#
      • 1...Kxe5!
    • 1.Qh6?
      • 1...exf5
        • 2.Qd6#
      • 1...Kxe5!
    • 1.Qf8?
      • threat
        • 2.Qc5#
        • 2.Qd6#
      • 1...exf5
        • 2.Qd6#
      • 1...Kxe5!
  • Keys
    • 1.Qd8+!
      • 1...Kxe5
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • P(b);OGATE,XS(D)::QAR1(E)
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Vars
        • P(b);OGATE,XS(D)::QAR1(E)
      • Refutation
        • K(a);P_SPINP(b),S_FLIGHT
    • Try
      • Q(E);
      • Threat
        • DUALS(2)
      • Vars
        • K(a);P-FLIGHT,XP(C)::QAB1(E)
      • Refutation
        • P(b);XS(D)
    • Try
      • Q(E);
      • Threat
        • DUALS(2)
      • Vars
        • P(b);XS(D)::QAR1(E)
      • Refutation
        • K(a);P-FLIGHT,P_SPINP(b),XP(C)
    • Try
      • Q(E);
      • Vars
        • P(b);OGATE,XS(D)::QAR1(E)
      • Refutation
        • K(a);P-FLIGHT,XP(C)
    • Try
      • Q(E);
      • Vars
        • P(b);OGATE,XS(D)::QAR1(E)
      • Refutation
        • K(a);P-FLIGHT,XP(C)
    • Try
      • Q(E);
      • Threat
        • DUALS(2)
      • Vars
        • P(b);XS(D)::QAR1(E)
      • Refutation
        • K(a);P-FLIGHT,XP(C)
  • Actual
    • Q(E);CHECK
    • Vars
      • K(a);OGATE,P-FLIGHT,XP(C)::QAB1(E)
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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).