MESON Chess Problem Database

Problem Display
PID: 273096 (2B1n3/qp4pN/2P1Nprb/1QB1k2b/2P2Rp1/1rp1KnP1/2P5/8 w - - 0 1)

Ling, John Francis

Liverpool and Merseyside Illustrated, 1960

2B1n3/qp4pN/2P1Nprb/1QB1k2b/2P2Rp1/1rp1KnP1/2P5/8

#2

11 + 13

15239 Valois Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc5+
      • 2.Qxc5#
    • 1...Qb8
      • 2.Bb4#
    • 1...Qa1
      • 2.Bb4#
    • 1...Qa2
      • 2.Bb4#
    • 1...Qa3
      • 2.Bb4#
    • 1...Qa8
      • 2.Bb4#
    • 1...Sd6
      • 2.Bd4#
    • 1...b6
      • 2.Bb4#
  • Tries
    • 1.Seg5?
      • threat
        • 2.Sf7#
        • 2.Re4#
        • 2.Rf5#
      • 1...Qxc5+
        • 2.Qxc5#
      • 1...Rxg5
        • 2.Re4#
      • 1...Sxg5
        • 2.Rf5#
      • 1...fxg5
        • 2.Re4#
        • 2.Rf5#
      • 1...bxc6
        • 2.Re4#
        • 2.Rf5#
      • 1...Sd2
        • 2.Sf7#
        • 2.Rf5#
      • 1...Sd4
        • 2.Sf7#
        • 2.Re4#
      • 1...Sh4
        • 2.Sf7#
        • 2.Re4#
      • 1...Sd6
        • 2.Bd4#
      • 1...f5
        • 2.Sf7#
        • 2.Rxf5#
      • 1...b6
        • 2.Bb4#
        • 2.Re4#
        • 2.Rf5#
      • 1...Bxg5!
    • 1.Bb6+?
      • 1...Kd6
        • 2.Qc5#
      • 1...Rxb5!
    • 1.Bxa7+?
      • 1...Kd6
        • 2.Qc5#
      • 1...Rxb5!
  • Keys
    • 1.Sd8!
      • threat
        • 2.Sf7#
      • 1...Qxc5+
        • 2.Qxc5#
      • 1...Bxf4+
        • 2.gxf4#
      • 1...bxc6
        • 2.Sxc6#
      • 1...Rg5
        • 2.Re4#
      • 1...Sg5
        • 2.Rf5#
      • 1...Sd6
        • 2.Bd4#
      • 1...b6
        • 2.Bb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • Q(j);CHECK,OGATE,P_SPINQ(j),XB(G)::QAR2(F),XQ(j)
    • Q(j);N_PINB(G)::QAR(F)+B(G)
    • S(m);SBLOCK::QAR(F)+B(G),DCHECK
    • P(k);N_PINB(G)::QAR(F)+B(G)
  • Tries
    • Try
      • S(I);N_SPINR(E)
      • Threat
        • DUALS(3)
      • Vars
        • Q(j);CHECK,OGATE,P_SPINQ(j),XB(G)::QAR2(F),XQ(j)
        • R(h);XS(I)::R1(E)
        • S(c);XS(I)::R1(E)
        • S(m);SBLOCK::QAR(F)+B(G),DCHECK
      • Refutation
        • B(i);P_PINR(E),XS(I)
    • Try
      • B(G);CHECK
      • Vars
        • K(e);S_FLIGHT::QAB1(F)
      • Refutation
        • R(a);XQ(F)
    • Try
      • B(G);CHECK,N_SPINB(G),XQ(j)
      • Vars
        • K(e);S_FLIGHT::QAB1(F)
      • Refutation
        • R(a);XQ(F)
  • Actual
    • S(I);
    • Threat
      • S(I)
    • Vars
      • Q(j);CHECK,OGATE,P_SPINQ(j),XB(G)::QAR2(F),XQ(j)
      • B(i);CHECK,OGATE,XR(E)::P(C),XB(i)
      • P(k);XP(H)::S(I),XP(k)
      • R(h);N_PINR(E)::R1(E)
      • S(c);N_PINR(E)::R1(E)
      • S(m);SBLOCK::QAR(F)+B(G),DCHECK
      • P(k);N_PINB(G)::QAR(F)+B(G)
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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).