MESON Chess Problem Database

Problem Display
PID: 12467 (8/1n1ppN2/R1b1k1B1/1R3ppN/2P1n3/8/4Q1K1/b7 w - - 0 1)

Gooderson, Arthur R

The Problemist, 1979

8/1n1ppN2/R1b1k1B1/1R3ppN/2P1n3/8/4Q1K1/b7

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Be5
      • 2.Rxe5#
    • 1...Sd6
      • 2.Sxg5#
      • 2.Sd8#
    • 1...f4
      • 2.Qg4#
  • Tries
    • 1.Qxe4+?
      • 1...Be5
        • 2.Rxe5#
        • 2.Qd5#
      • 1...fxe4!
  • Keys
    • 1.Qf3!
      • threat
        • 2.Qxf5#
      • 1...Sd2
        • 2.Qd5#
      • 1...Sf2
        • 2.Qd5#
      • 1...Sc3
        • 2.Re5#
      • 1...Sg3
        • 2.Qd5#
      • 1...Sec5
        • 2.Qd5#
      • 1...Sed6
        • 2.Sxg5#
      • 1...Sf6
        • 2.Sg7#
      • 1...Sbd6
        • 2.Sd8#
      • 1...f4
        • 2.Qg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 1
  • Sets
    • B(a);N_GUARD,N_SPINS(b)::R1(D),XB(a)
    • P(c);OGATEB::QAB(A)
  • Tries
    • Try
      • Q(A);CHECK,P_SPINQ(A),XS(b)
      • Refutation
        • P(c);XQ(A)
  • Actual
    • Q(A);N_PINS(b)
    • Threat
      • QAB1(A),XP(c)
    • Vars
      • S(b);OGATE,P_PINQ(A)::QAB1(A)
      • S(b);P_PINQ(A),S_CUTB(a)::R1(D)
      • S(b);N_GUARD,N_SPINB(e),P_PINQ(A),SBLOCK::S(H),XP(d)
      • S(b);P_PINQ(A),SBLOCK,S_CUTB(a)::S(E)
      • S(g);N_GUARD,N_SPINB(e),SBLOCK::S(H)
      • P(c);OGATEB::QAB(A)
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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).