MESON Chess Problem Database

Problem Display
PID: 231464 (8/8/8/5p2/3K4/3N1k2/5N2/6Q1 w - - 0 1)

Szentgyorgy, Erno

Magyar Sakkvilag, 1927

8/8/8/5p2/3K4/3N1k2/5N2/6Q1

#2

4 + 2

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ke2
      • 2.Qd1#
    • 1...f4
      • 2.Qg4#
  • Tries
    • 1.Se1+?
      • 1...Kf4
        • 2.Sfd3#
        • 2.Sh3#
      • 1...Ke2!
    • 1.Se5+?
      • 1...Kf4
        • 2.Sfd3#
        • 2.Sh3#
      • 1...Ke2!
    • 1.Qf1?
      • 1...Kg3
        • 2.Qh3#
      • 1...f4!
    • 1.Qg5?
      • 1...f4
        • 2.Qg4#
      • 1...Ke2!
    • 1.Qg6?
      • 1...f4
        • 2.Qg4#
      • 1...Ke2!
    • 1.Qg7?
      • 1...f4
        • 2.Qg4#
      • 1...Ke2!
    • 1.Qg8?
      • 1...f4
        • 2.Qg4#
      • 1...Ke2!
  • Keys
    • 1.Qh1+!
      • 1...Ke2
        • 2.Qd1#
      • 1...Kg3
        • 2.Qh3#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • K(a);S_FLIGHT::QAB1(A)
    • P(b);N_GUARD::QAB1(A)
  • Tries
    • Try
      • S(C);CHECK
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • S(C);CHECK
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(a);P-FLIGHT::QAR1(A)
      • Refutation
        • P(b);
    • Try
      • Q(A);
      • Vars
        • P(b);N_GUARD::QAB1(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • P(b);N_GUARD::QAB1(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • P(b);N_GUARD::QAB1(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • P(b);N_GUARD::QAB1(A)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(A);CHECK
    • Vars
      • K(a);S_FLIGHT::QAB1(A)
      • K(a);P-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).