MESON Chess Problem Database

Problem Display
PID: 227900 (5K2/8/5k1n/3Q3P/4P3/8/8/8 w - - 0 1)

Ballo, Gyorgy

Magyar Sakkvilag, 1926

5K2/8/5k1n/3Q3P/4P3/8/8/8

#2

4 + 2

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sg4
      • 2.Qf5#
    • 1...Sf5
      • 2.Qxf5#
    • 1...Sf7
      • 2.Qf5#
    • 1...Sg8
      • 2.Qf5#
  • Tries
    • 1.Qa5?
      • 1...Sf5
        • 2.Qxf5#
      • 1...Sg4
        • 2.Qf5#
      • 1...Sf7
        • 2.Qf5#
      • 1...Sg8
        • 2.Qf5#
      • 1...Ke6!
    • 1.Qb5?
      • 1...Sf5
        • 2.Qxf5#
      • 1...Sg4
        • 2.Qf5#
      • 1...Sf7
        • 2.Qf5#
      • 1...Sg8
        • 2.Qf5#
      • 1...Ke6!
    • 1.Qg5+?
      • 1...Ke6
        • 2.Qe7#
      • 1...Kxg5!
    • 1.Qd8+?
      • 1...Ke6
        • 2.Qe7#
      • 1...Ke5!
  • Keys
    • 1.Qc5!
      • threat
        • 2.Qe7#
      • 1...Ke6
        • 2.Qe7#
      • 1...Sf5
        • 2.Qxf5#
      • 1...Sg8
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • S(b);N_GUARD::QAR1(B)
    • S(b);N_GUARD::QAR1(B),XS(b)
  • Tries
    • Try
      • Q(B);
      • Vars
        • S(b);N_GUARD::QAR1(B),XS(b)
        • S(b);N_GUARD::QAR1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);
      • Vars
        • S(b);N_GUARD::QAR1(B),XS(b)
        • S(b);N_GUARD::QAR1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);OGATE,P-FLIGHT::QAR1(B)
      • Refutation
        • K(a);S_FLIGHT,XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(B)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(B);
    • Threat
      • QAB1(B)
    • Vars
      • K(a);P-FLIGHT::QAR1(B)
      • S(b);N_GUARD::QAR1(B),XS(b)
      • S(b);N_GUARD::QAR1(B)
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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).