MESON Chess Problem Database

Problem Display
PID: 139651 (Q7/8/8/8/6K1/8/6R1/R3n1rk w - - 0 1)

Davis, Edward

Kipping, Cyril Stanley

The Problemist, 1937

Q7/8/8/8/6K1/8/6R1/R3n1rk

#2

4 + 3

5454 Near Snap 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sc2
      • 2.Raxg1#
    • 1...Sd3
      • 2.Raxg1#
  • Tries
    • 1.Kh3?
      • threat
        • 2.Rh2#
      • 1...Rxg2
        • 2.Rxe1#
        • 2.Qxg2#
      • 1...Sxg2
        • 2.Qxg2#
      • 1...Rf1!
    • 1.Rxe1?
      • threat
        • 2.Rexg1#
      • 1...Rf1
        • 2.Rxf1#
      • 1...Rxe1!
    • 1.Rxg1+?
      • 1...Kh2
        • 2.Rh1#
        • 2.Qh1#
      • 1...Kxg1!
    • 1.Rg3+?
      • 1...Kh2
        • 2.Qh8#
      • 1...Rg2
        • 2.Qxg2#
      • 1...Sg2
        • 2.Rh3#
        • 2.Qxg2#
      • 1...Sf3!
  • Keys
    • 1.Kg3!
      • threat
        • 2.Qh8#
      • 1...Rxg2+
        • 2.Qxg2#
      • 1...Sxg2
        • 2.Qxg2#
      • 1...Sf3
        • 2.Rgxg1#

This anticipates 225995(1981)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • S(a);OGATE,P_SPINR(b)::R1(A),XR(b)
  • Tries
    • Try
      • K(C);N_SPINR(B),S_FLIGHT
      • Threat
        • QAB(D)+R(B),DCHECK
      • Vars
        • S(a);OGATE,P_SPINR(b),P_SPINS(a),XR(B)::QAB1(D),XS(a)
      • Refutation
        • R(b);
    • Try
      • R(A);P_PINR(b),XS(a)
      • Threat
        • R1(A),XR(b)
      • Vars
        • R(b);N_PINR(B),OGATEB::R(A),XR(b)
      • Refutation
        • R(b);N_PINR(B),N_SPINR(b),XR(A)
    • Try
      • R(B);CHECK,N_SPINR(B),XR(b)
      • Refutation
        • K(c);P-FLIGHT,P_SPINS(a),XR(B)
    • Try
      • R(B);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR(D)
        • R(b);N_GUARD,P_SPINR(b),P_SPINS(a)::QAB1(D),XR(b)
      • Refutation
        • S(a);P_SPINR(b),P_SPINS(a)
  • Actual
    • K(C);P-FLIGHT
    • Threat
      • QAB(D)
    • Vars
      • R(b);CHECK,OGATE,P_SPINR(b),P_SPINS(a),XR(B)::QAB1(D),XR(b)
      • S(a);OGATE,P_SPINR(b),P_SPINS(a),XR(B)::QAB1(D),XS(a)
      • S(a);P_SPINR(b)::R1(B),XR(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).