MESON Chess Problem Database

Problem Display
PID: 249051 (4n3/3R3R/4k3/2p5/2P2K2/8/8/8 w - - 0 1)

de Blasio, Francis JC

Sjakk-Nytt, 1947

4n3/3R3R/4k3/2p5/2P2K2/8/8/8

#2

4 + 3

15601 Albrecht-Leiss-Degener Collection 2021
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kf6
      • 2.Rh6#
    • 1...Sf6
      • 2.Rhe7#
  • Tries
    • 1.Kg5?
      • threat
        • 2.Rhe7#
      • 1...Ke5
        • 2.Rhe7#
      • 1...Sg7!
    • 1.Ra7?
      • 1...Kd6
        • 2.Ra6#
      • 1...Kf6
        • 2.Rh6#
      • 1...Sd6
        • 2.Rh6#
      • 1...Sf6
        • 2.Ra6#
      • 1...Sg7
        • 2.Rh6#
      • 1...Sc7!
  • Keys
    • 1.Rb7!
      • 1...Kd6
        • 2.Rb6#
      • 1...Kf6
        • 2.Rh6#
      • 1...Sd6
        • 2.Rh6#
      • 1...Sf6
        • 2.Rb6#
      • 1...Sc7
        • 2.Rb6#
      • 1...Sg7
        • 2.Rh6#

This anticipates 132734(1958), 11700(1971), 176200(1976), 152675(2011)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(b);P-FLIGHT::R(D)
    • S(c);SBLOCK::R1(D)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Threat
        • R1(D)
      • Vars
        • K(b);P-FLIGHT::R(D)
      • Refutation
        • S(c);
    • Try
      • R(C);
      • Vars
        • K(b);P-FLIGHT::R(C)
        • K(b);P-FLIGHT::R(D)
        • S(c);N_GUARD,SBLOCK::R(D)
        • S(c);N_GUARD,SBLOCK::R(C)
        • S(c);N_GUARD::R(D)
      • Refutation
        • S(c);
  • Actual
    • R(C);
    • Vars
      • K(b);P-FLIGHT::R(C)
      • K(b);P-FLIGHT::R(D)
      • S(c);N_GUARD,SBLOCK::R(D)
      • S(c);N_GUARD,SBLOCK::R(C)
      • S(c);N_GUARD::R(C)
      • S(c);N_GUARD::R(D)
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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).