MESON Chess Problem Database

Problem Display
PID: 241457 (4k3/3pb3/6K1/4Q3/8/3R4/8/8 w - - 0 1)

Hjelle, David

Arbejder-Skak, 1956

4k3/3pb3/6K1/4Q3/8/3R4/8/8

#2

3 + 3

15148 Sadier Collection 2021
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kd8
      • 2.Qb8#
    • 1...Kf8
      • 2.Qh8#
  • Tries
    • 1.Rd5?
      • 1...Kd8
        • 2.Qb8#
      • 1...Kf8
        • 2.Qh8#
      • 1...d6!
    • 1.Rd6?
      • 1...Kf8
        • 2.Qh8#
      • 1...Kd8!
    • 1.Rxd7?
      • threat
        • 2.Qxe7#
      • 1...Kf8
        • 2.Qh8#
      • 1...Kxd7!
  • Keys
    • 1.Re3!
      • threat
        • 2.Qb8#
        • 2.Qh8#
        • 2.Qxe7#
      • 1...Kd8
        • 2.Qb8#
      • 1...Kf8
        • 2.Qh8#
      • 1...d5
        • 2.Qxe7#
      • 1...d6
        • 2.Qxe7#

This anticipates 79259(1980)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(c);N_SPINB(b),P-FLIGHT,P_SPINP(a)::QAR2(B)
    • K(c);N_SPINB(b),P-FLIGHT::QAR2(B)
  • Tries
    • Try
      • R(A);
      • Vars
        • K(c);N_SPINB(b),P-FLIGHT,P_SPINP(a)::QAR2(B)
        • K(c);N_SPINB(b),P-FLIGHT::QAR2(B)
      • Refutation
        • P(a);
    • Try
      • R(A);
      • Vars
        • K(c);N_SPINB(b),P-FLIGHT::QAR2(B)
      • Refutation
        • K(c);N_SPINB(b),P-FLIGHT,P_SPINP(a)
    • Try
      • R(A);XP(a)
      • Threat
        • QAR1(B),XB(b)
      • Vars
        • K(c);N_SPINB(b),P-FLIGHT::QAR2(B)
      • Refutation
        • K(c);N_SPINB(b),S_FLIGHT,XR(A)
  • Actual
    • R(A);
    • Threat
      • DUALS(3)
    • Vars
      • K(c);N_SPINB(b),P-FLIGHT::QAR2(B)
      • P(a);::QAR1(B),XB(b)
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).