MESON Chess Problem Database

Problem Display
PID: 271267 (4B3/4pN1r/6kP/6b1/3Q2Kn/8/8/8 w - - 0 1)

Eddy, Edwin John

The Observer, 1960

(First published on Sun Mar 13 1960)

4B3/4pN1r/6kP/6b1/3Q2Kn/8/8/8

#2

5 + 5

17397 Ling Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Rxh6
      • 2.Sxg5#
    • 1...Rxf7
      • 2.Qg7#
    • 1...Rg7
      • 2.Qxg7#
    • 1...Rh8
      • 2.Qg7#
    • 1...Bxh6
      • 2.Sh8#
  • Tries
    • 1.Sxg5+?
      • 1...Rf7
        • 2.Qg7#
      • 1...Kxh6!
    • 1.Sd6+?
      • 1...Rf7
        • 2.Qg7#
      • 1...Kxh6!
    • 1.Sd8+?
      • 1...Rf7
        • 2.Qg7#
      • 1...Kxh6!
    • 1.Qd3+?
      • 1...Sf5
        • 2.Qxf5#
      • 1...Kf6!
    • 1.Qe4+?
      • 1...Sf5
        • 2.Qxf5#
      • 1...Kf6!
  • Keys
    • 1.Qe5!
      • threat
        • 2.Qxg5#
      • 1...Rxh6
        • 2.Sxg5#
      • 1...Rxf7
        • 2.Qg7#
      • 1...Bxh6
        • 2.Sh8#
      • 1...Rg7
        • 2.Qxg7#
      • 1...Rh8
        • 2.Qg7#
      • 1...Bc1
        • 2.Qe6#
      • 1...Bd2
        • 2.Qe6#
      • 1...Be3
        • 2.Qe6#
      • 1...Bf4
        • 2.Qe6#
      • 1...Bf6
        • 2.Qh5#
      • 1...Sf3
        • 2.Qf5#
      • 1...Sf5
        • 2.Qxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • R(e);N_GUARD,SBLOCK,XP(C)::B(E)+S(D),XB(b)
    • R(e);N_GUARD,P_SPINR(e),XS(D)::QAR1(A)
    • R(e);N_GUARD::QAR1(A),XR(e)
    • R(e);N_GUARD::QAR1(A)
    • B(b);SBLOCK,XP(C)::B(E)+S(D),DCHECK
  • Tries
    • Try
      • S(D);CHECK,XB(b)
      • Vars
        • R(e);P_SPINR(e)::QAR1(A)
      • Refutation
        • K(c);P-FLIGHT,XP(C)
    • Try
      • S(D);CHECK
      • Vars
        • R(e);P_SPINR(e)::QAR1(A)
      • Refutation
        • K(c);P-FLIGHT,XP(C)
    • Try
      • S(D);CHECK
      • Vars
        • R(e);P_SPINR(e)::QAR1(A)
      • Refutation
        • K(c);P-FLIGHT,XP(C)
    • Try
      • Q(A);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(A),XS(a)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(A),XS(a)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • Q(A);
    • Threat
      • QAR1(A),XB(b)
    • Vars
      • R(e);N_GUARD,SBLOCK,XP(C)::B(E)+S(D),XB(b)
      • R(e);N_GUARD,P_SPINR(e),XS(D)::QAR1(A)
      • B(b);SBLOCK,XP(C)::B(E)+S(D),DCHECK
      • R(e);N_GUARD::QAR1(A),XR(e)
      • R(e);N_GUARD::QAR1(A)
      • B(b);N_GUARD::QAR2(A)
      • B(b);OGATE,SBLOCK::QAB1(A)
      • S(a);N_GUARD::QAB1(A)
      • S(a);N_GUARD::QAB1(A),XS(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).