MESON Chess Problem Database

Problem Display
PID: 227836 (7n/8/7p/5Qpk/7p/7K/8/8 w - - 0 1)

Ballo, Gyorgy

Pikler, Robert

Magyar Sakkvilag, 1926

7n/8/7p/5Qpk/7p/7K/8/8

#2

2 + 5

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sg6
      • 2.Qg4#
    • 1...Sf7
      • 2.Qxf7#
  • Tries
    • 1.Qe4?
      • 1...g4+
        • 2.Qxg4#
      • 1...Sg6
        • 2.Qg4#
      • 1...Sf7!
    • 1.Qd7?
      • 1...g4+
        • 2.Qxg4#
      • 1...Sg6
        • 2.Qg4#
      • 1...Sf7
        • 2.Qxf7#
      • 1...Kg6!
    • 1.Qf3+?
      • 1...g4+
        • 2.Qxg4#
      • 1...Kg6!
  • Keys
    • 1.Qe6!
      • 1...g4+
        • 2.Qxg4#
      • 1...Sg6
        • 2.Qg4#
      • 1...Sf7
        • 2.Qxf7#

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(e);SBLOCK::QAB1(B)
    • S(e);N_GUARD::QAB(B),XS(e)
  • Tries
    • Try
      • Q(B);N_PINP(b)
      • Vars
        • P(b);CHECK::QAB1(B),XP(b)
        • S(e);SBLOCK::QAB1(B)
      • Refutation
        • S(e);
    • Try
      • Q(B);N_PINP(b)
      • Vars
        • P(b);CHECK::QAB1(B),XP(b)
        • S(e);SBLOCK::QAB1(B)
        • S(e);N_GUARD::QAB(B),XS(e)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(B);CHECK,N_PINP(b)
      • Vars
        • P(b);CHECK,P_SPINP(b)::QAB1(B),XP(b)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • Q(B);N_PINP(b)
    • Vars
      • P(b);CHECK::QAB1(B),XP(b)
      • S(e);SBLOCK::QAB1(B)
      • S(e);N_GUARD::QAB(B),XS(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).