MESON Chess Problem Database

Problem Display
PID: 5976 (bN6/4B1RP/r2pk2n/n5P1/4BP2/1r5p/2P5/3RQ2K w - - 0 1)

Larsen, Karl Adolf Koefoed

3rd Prize, Brisbane Courier, 1926

bN6/4B1RP/r2pk2n/n5P1/4BP2/1r5p/2P5/3RQ2K

#2

11 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Rb7
      • 2.Bg6#
    • 1...Ra7
      • 2.Rxd6#
    • 1...Bxe4+
      • 2.Qxe4#
    • 1...Bc6
      • 2.Rxd6#
    • 1...Sc6
      • 2.Rxd6#
    • 1...Sf5
      • 2.Bd5#
    • 1...Sg8
      • 2.hxg8Q#
      • 2.hxg8B#
    • 1...d5
      • 2.Bd3#
  • Tries
    • 1.f5+?
      • 1...Sxf5
        • 2.Bd5#
      • 1...Ke5!
  • Keys
    • 1.Bf8!
      • threat
        • 2.Re7#
      • 1...Bxe4+
        • 2.Qxe4#
      • 1...Rb7
        • 2.Bg6#
      • 1...Ra7
        • 2.Rxd6#
      • 1...Sc6
        • 2.Rxd6#
      • 1...Sf5
        • 2.Bd5#
      • 1...Sf7
        • 2.Rg6#
      • 1...Sg8
        • 2.hxg8Q#
        • 2.hxg8B#
      • 1...d5
        • 2.Bd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • R(a);N_PINB(E)::QAR(B)+B(E)
    • R(d);N_GUARD::R1(A),XP(e)
    • B(h);CHECK,P_SPINB(h),XB(E)::QAR2(B),XB(h)
    • B(h);S_CUTR(d)::R1(A),XP(e)
    • S(c);N_PINB(E),S_CUTR(d)::R1(A),XP(e)
    • S(g);SBLOCK::QAR(B)+B(E),DCHECK
    • S(g);OGATE::PXS(g)=Q
    • P(e);N_PINB(E),SBLOCK::QAR(B)+B(E)
  • Tries
    • Try
      • P(F);CHECK
      • Vars
        • S(g);SBLOCK,XP(F)::QAR(B)+B(E),DCHECK
      • Refutation
        • K(f);P-FLIGHT
  • Actual
    • B(H);
    • Threat
      • R1(I)
    • Vars
      • B(h);CHECK,P_SPINB(h),XB(E)::QAR2(B),XB(h)
      • R(a);N_PINB(E)::QAR(B)+B(E)
      • R(d);N_GUARD::R1(A),XP(e)
      • S(c);N_PINB(E),S_CUTR(d)::R1(A),XP(e)
      • S(g);SBLOCK::QAR(B)+B(E),DCHECK
      • S(g);SBLOCK::R(I)
      • S(g);OGATE::PXS(g)=Q
      • P(e);N_PINB(E),SBLOCK::QAR(B)+B(E)
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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).