MESON Chess Problem Database

Problem Display
PID: 18330 (B4Q2/8/5n2/3ppPp1/R1q2kp1/6N1/bB1P3K/4N3 w - - 0 1)

Whyatt, William Albert

1st Prize, Australian Chess Problem Society, 1955

B4Q2/8/5n2/3ppPp1/R1q2kp1/6N1/bB1P3K/4N3

#2

9 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Se4
      • 2.Sh5#
    • 1...d4
      • 2.Sg2#
    • 1...e4
      • 2.Qd6#
  • Tries
    • 1.Rxc4+?
      • 1...Se4
        • 2.Se2#
        • 2.Sh5#
      • 1...dxc4
        • 2.Sg2#
      • 1...d4
        • 2.Sg2#
        • 2.Sd3#
      • 1...e4
        • 2.Qd6#
        • 2.Qb8#
      • 1...Bxc4!
    • 1.Qa3?
      • threat
        • 2.Sg2#
        • 2.Qe3#
      • 1...d4
        • 2.Sg2#
      • 1...Bb3!
    • 1.Qc5?
      • threat
        • 2.Qf2#
        • 2.Qe3#
      • 1...Se4
        • 2.Qe3#
      • 1...d4
        • 2.Sg2#
      • 1...Qd4!
    • 1.Qxf6?
      • threat
        • 2.Bxe5#
        • 2.Qxe5#
      • 1...d4
        • 2.Sg2#
        • 2.Sh5#
      • 1...e4
        • 2.Sh5#
        • 2.Be5#
        • 2.Qe5#
        • 2.Qd6#
      • 1...Qd4!
  • Keys
    • 1.Bc1!
      • threat
        • 2.d3#
      • 1...e4
        • 2.Qd6#
      • 1...Se4
        • 2.Sh5#
      • 1...d4
        • 2.Sg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • S(h);N_GUARD,N_SPINQ(b),SBLOCK::S(E)
    • P(e);N_SPINQ(b)::S(A)
    • P(f);N_SPINQ(b),OGATEB::QAB(I)
  • Tries
    • Try
      • R(F);CHECK,XQ(b)
      • Vars
        • P(e);XR(F)::S(A)
      • Refutation
        • B(a);XR(F)
    • Try
      • Q(I);
      • Threat
        • DUALS(2)
      • Vars
        • P(e);N_SPINQ(b)::S(A)
      • Refutation
        • B(a);
    • Try
      • Q(I);
      • Threat
        • DUALS(2)
      • Vars
        • S(h);N_SPINQ(b)::QAB1(I)
        • P(e);N_SPINQ(b)::S(A)
      • Refutation
        • Q(b);
    • Try
      • Q(I);XS(h)
      • Threat
        • DUALS(2)
      • Refutation
        • Q(b);
  • Actual
    • B(B);
    • Threat
      • B(B)+P(C)
    • Vars
      • P(f);N_SPINQ(b),OGATEB::QAB(I)
      • S(h);N_GUARD,N_SPINQ(b),SBLOCK::S(E)
      • P(e);N_SPINQ(b)::S(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).