MESON Chess Problem Database

Problem Display
PID: 70446 (1B2R3/6p1/5p2/5kPQ/K1p3p1/5q1n/2PN1R2/1b1B2n1 w - - 0 1)

Bonavia-Hunt, Rev Noel Aubrey

Chess, 1951

1B2R3/6p1/5p2/5kPQ/K1p3p1/5q1n/2PN1R2/1b1B2n1

#2

9 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf2
      • 2.Bxg4#
    • 1...Qf4
      • 2.Bxg4#
    • 1...Bxc2+
      • 2.Bxc2#
    • 1...Sxf2
      • 2.g6#
    • 1...fxg5
      • 2.Qf7#
  • Tries
    • 1.Sf1?
      • threat
        • 2.Se3#
        • 2.Sg3#
      • 1...Bxc2+
        • 2.Bxc2#
      • 1...Qxf2
        • 2.Bxg4#
      • 1...Sxf2
        • 2.g6#
      • 1...fxg5
        • 2.Qf7#
      • 1...Se2
        • 2.Se3#
      • 1...g3
        • 2.Se3#
        • 2.Sxg3#
      • 1...Sf4!
  • Keys
    • 1.Sxc4!
      • threat
        • 2.Se3#
      • 1...Bxc2+
        • 2.Bxc2#
      • 1...Qxf2
        • 2.Bxg4#
      • 1...Sxf2
        • 2.g6#
      • 1...fxg5
        • 2.Qf7#
      • 1...Qf4
        • 2.Bxg4#
      • 1...Sf4
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • Q(c);N_SPINQ(c),OGATE,XR(D)::B(A),XP(f)
    • Q(c);OGATE::B(A),XP(f)
    • B(a);CHECK,OGATE,XP(B)::B(A),XB(a)
    • S(d);N_GUARD,N_SPINQ(c),XR(D)::QAR(G)+P(F)
    • P(h);OGATEB,P_SPINP(h),SBLOCK,XP(F)::QAR2(G)
  • Tries
    • Try
      • S(C);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);CHECK,OGATE,XP(B)::B(A),XB(a)
        • Q(c);N_SPINQ(c),OGATE,XR(D)::B(A),XP(f)
        • S(d);N_GUARD,N_SPINQ(c),XR(D)::QAR(G)+P(F)
        • P(h);OGATEB,P_SPINP(h),SBLOCK,XP(F)::QAR2(G)
        • S(b);::S(C)
      • Refutation
        • S(d);N_SPINQ(c)
  • Actual
    • S(C);XP(e)
    • Threat
      • S(C)
    • Vars
      • B(a);CHECK,OGATE,XP(B)::B(A),XB(a)
      • Q(c);N_SPINQ(c),OGATE,XR(D)::B(A),XP(f)
      • S(d);N_GUARD,N_SPINQ(c),XR(D)::QAR(G)+P(F)
      • P(h);OGATEB,P_SPINP(h),SBLOCK,XP(F)::QAR2(G)
      • Q(c);OGATE,P_PINS(C)::B(A),XP(f)
      • S(d);N_SPINQ(c),SBLOCK::S(C)
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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).