MESON Chess Problem Database

Problem Display
PID: 227885 (4k3/8/2nQ1K2/8/8/8/8/8 w - - 0 1)

L'Hermet, Johann Georg Rudolf

Revista Romana de Sah, 1926

4k3/8/2nQ1K2/8/8/8/8/8

#2

2 + 2

3713 Snap 2020
6490 yacpdb 2020
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sb4
      • 2.Qe7#
    • 1...Sd4
      • 2.Qe7#
    • 1...Sa5
      • 2.Qe7#
    • 1...Se5
      • 2.Qe7#
    • 1...Sa7
      • 2.Qe7#
    • 1...Se7
      • 2.Qxe7#
    • 1...Sb8
      • 2.Qe7#
    • 1...Sd8
      • 2.Qe7#
  • Tries
    • 1.Qxc6+?
      • 1...Kf8
        • 2.Qa8#
        • 2.Qc8#
      • 1...Kd8!
    • 1.Qe6+?
      • 1...Kf8
        • 2.Qf7#
      • 1...Se7
        • 2.Qxe7#
      • 1...Kd8!
    • 1.Qd7+?
      • 1...Kf8
        • 2.Qf7#
      • 1...Kxd7!
  • Keys
    • 1.Qc7!
      • 1...Kf8
        • 2.Qf7#
      • 1...Sb4
        • 2.Qe7#
        • 2.Qc8#
      • 1...Sd4
        • 2.Qe7#
        • 2.Qc8#
      • 1...Sa5
        • 2.Qe7#
        • 2.Qc8#
      • 1...Se5
        • 2.Qe7#
        • 2.Qc8#
      • 1...Sa7
        • 2.Qe7#
      • 1...Se7
        • 2.Qxe7#
      • 1...Sb8
        • 2.Qe7#
        • 2.Qc8#
      • 1...Sd8
        • 2.Qe7#

Anticipated by 203503(1924), 227718(1926)

This anticipates 120861(1967), 216695(1975)

FEATURES

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