MESON Chess Problem Database

Problem Display
PID: 205721 (7Q/8/8/8/4p3/8/4K1k1/5R2 w - - 0 1)

Junker, Karl

Deutsche Schachblatter, 1925

7Q/8/8/8/4p3/8/4K1k1/5R2

#2

3 + 2

5454 Near Snap 2020
6490 yacpdb 2020

SOLUTION

  • SOUND
  • Tries
    • 1.Rf2+?
      • 1...Kg1
        • 2.Qa1#
        • 2.Qh2#
      • 1...Kg3!
    • 1.Rf4?
      • threat
        • 2.Rg4#
      • 1...Kg1
        • 2.Rg4#
      • 1...Kg3!
    • 1.Rf5?
      • threat
        • 2.Rg5#
      • 1...Kg1
        • 2.Rg5#
      • 1...Kg3!
    • 1.Rf6?
      • threat
        • 2.Rg6#
      • 1...Kg1
        • 2.Rg6#
      • 1...Kg3!
    • 1.Rf7?
      • threat
        • 2.Rg7#
      • 1...Kg1
        • 2.Rg7#
      • 1...Kg3!
    • 1.Rf8?
      • threat
        • 2.Rg8#
      • 1...Kg1
        • 2.Rg8#
      • 1...Kg3!
    • 1.Qg7+?
      • 1...Kh3
        • 2.Rh1#
      • 1...Kh2!
    • 1.Qh6?
      • 1...Kg3
        • 2.Rg1#
      • 1...e3!
    • 1.Qg8+?
      • 1...Kh3
        • 2.Rh1#
      • 1...Kh2!
  • Keys
    • 1.Ke3!
      • 1...Kxf1
        • 2.Qh1#
      • 1...Kg3
        • 2.Rg1#

This anticipates 121023(1940), 208718(1949), 47259(2002)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(A);CHECK
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(A);
      • Threat
        • R(A)
      • Vars
        • K(a);P-FLIGHT::R(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(A);
      • Threat
        • R(A)
      • Vars
        • K(a);P-FLIGHT::R(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(A);
      • Threat
        • R(A)
      • Vars
        • K(a);P-FLIGHT::R(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(A);
      • Threat
        • R(A)
      • Vars
        • K(a);P-FLIGHT::R(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(A);
      • Threat
        • R(A)
      • Vars
        • K(a);P-FLIGHT::R(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);S_FLIGHT::R(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);
      • Vars
        • K(a);P-FLIGHT::R(A)
      • Refutation
        • P(b);
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);S_FLIGHT::R(A)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • K(B);P-FLIGHT
    • Vars
      • K(a);S_FLIGHT,XR(A)::QAR2(C)
      • K(a);P-FLIGHT::R(A)
HTML5 logo

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).