MESON Chess Problem Database

Problem Display
PID: 227718 (3k4/8/2K1Qn2/8/8/8/8/8 w - - 0 1)

Ferenczi, Istvan

Nepszava, 1926

3k4/8/2K1Qn2/8/8/8/8/8

#2

2 + 2

3713 Snap 2020
6490 yacpdb 2020
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Se4
      • 2.Qd7#
    • 1...Sg4
      • 2.Qd7#
    • 1...Sd5
      • 2.Qd7#
    • 1...Sh5
      • 2.Qd7#
    • 1...Sd7
      • 2.Qxd7#
    • 1...Sh7
      • 2.Qd7#
    • 1...Se8
      • 2.Qd7#
    • 1...Sg8
      • 2.Qd7#
  • Tries
    • 1.Qd6+?
      • 1...Kc8
        • 2.Qc7#
      • 1...Sd7
        • 2.Qxd7#
      • 1...Ke8!
    • 1.Qxf6+?
      • 1...Kc8
        • 2.Qh8#
        • 2.Qf8#
      • 1...Ke8!
    • 1.Qe7+?
      • 1...Kc8
        • 2.Qc7#
      • 1...Kxe7!
  • Keys
    • 1.Qf7!
      • 1...Kc8
        • 2.Qc7#
      • 1...Se4
        • 2.Qd7#
        • 2.Qf8#
      • 1...Sg4
        • 2.Qd7#
        • 2.Qf8#
      • 1...Sd5
        • 2.Qd7#
        • 2.Qf8#
      • 1...Sh5
        • 2.Qd7#
        • 2.Qf8#
      • 1...Sd7
        • 2.Qxd7#
      • 1...Sh7
        • 2.Qd7#
      • 1...Se8
        • 2.Qd7#
      • 1...Sg8
        • 2.Qd7#
        • 2.Qf8#

Anticipated by 203503(1924)

This anticipates 227885(1926), 120861(1967), 216695(1975)

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • S(a);N_GUARD::QAR1(B)
    • S(a);N_GUARD::QAR1(B),XS(a)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(B)
        • S(a);N_GUARD,P_SPINS(a)::QAR1(B),XS(a)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);CHECK,XS(a)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(B)
      • Refutation
        • K(b);S_FLIGHT,XQ(B)
  • Actual
    • Q(B);
    • Vars
      • K(b);P-FLIGHT::QAR1(B)
      • S(a);N_GUARD::QAR1(B),XS(a)
      • S(a);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).