MESON Chess Problem Database

Problem Display
PID: 145253 (4K2N/P3Rp2/p2k1r2/2N2P2/1P1q1P2/r7/B2p1p2/3RB1Q1 w - - 0 1)

Ling, John Francis

Morse, Christopher Jeremy

Problem Observer, 1993

4K2N/P3Rp2/p2k1r2/2N2P2/1P1q1P2/r7/B2p1p2/3RB1Q1

#2

12 + 8

SOLUTION

  • SOUND
  • Keys
    • 1.a8Q!
      • threat
        • 2.Rd7#
      • 1...Qxb4
        • 2.Qd5#
      • 1...Qxf4
        • 2.Qd5#
      • 1...dxe1Q
        • 2.Rxd4#
      • 1...dxe1R
        • 2.Rxd4#
      • 1...fxe1Q
        • 2.Qxd4#
      • 1...fxe1R
        • 2.Qxd4#
      • 1...Qe3
        • 2.Qd5#
      • 1...Qe5
        • 2.fxe5#
      • 1...Qe4
        • 2.Sxe4#
      • 1...Re3
        • 2.Qxa6#
      • 1...Re6
        • 2.Sxf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 11
    • REMOVED MATES = 0
  • Sets
  • Actual
    • P(I);
    • Threat
      • R1(J)
    • Vars
      • Q(d);N_GUARD,P_SPINP(a),XP(E)::QAR1(I)
      • Q(d);N_GUARD,P_SPINP(a),XP(F)::QAR1(I)
      • P(a);OGATE,P_PINR(J),P_SPINQ(d),XB(B)::R(A),XQ(d)
      • P(b);OGATE,P_PINR(J),XB(B)::QAR2(C),XQ(d)
      • Q(d);N_GUARD,P_PINR(J),P_SPINP(a)::QAR1(I)
      • Q(d);OGATE,P_PINR(J),P_SPINP(a)::P(F),XQ(d)
      • Q(d);N_GUARD,P_PINR(J),P_SPINP(a)::S(G),XQ(d)
      • R(c);N_GUARD,P_PINR(J)::QAR(I),XP(e)
      • R(g);N_GUARD,P_PINR(J)::S(L),XP(h)
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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).