MESON Chess Problem Database

Problem Display
PID: 221340 (b5B1/8/3P1kpP/3R2p1/n2p2rn/K1N2r2/3QP3/B4R2 w - - 0 1)

Ling, John Francis

The Problemist, 1944

b5B1/8/3P1kpP/3R2p1/n2p2rn/K1N2r2/3QP3/B4R2

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rff4
      • 2.Se4#
      • 2.Qxd4#
    • 1...Rg1
      • 2.Qxd4#
    • 1...Rg2
      • 2.Qxd4#
    • 1...Rg3
      • 2.Qxd4#
    • 1...Re4
      • 2.Qxg5#
    • 1...d3
      • 2.Se4#
  • Tries
    • 1.Qe3?
      • threat
        • 2.Qe5#
        • 2.Qe6#
        • 2.Qe7#
      • 1...dxe3
        • 2.Se4#
      • 1...Re4
        • 2.Sxe4#
        • 2.Qxg5#
      • 1...Sc5
        • 2.Qe5#
        • 2.Qe7#
      • 1...Sf5
        • 2.Qe5#
        • 2.Qe6#
      • 1...Bxd5!
  • Keys
    • 1.e4!
      • threat
        • 2.Qxd4#
      • 1...Rxe4
        • 2.Qxg5#
      • 1...dxc3
        • 2.Qd4#
      • 1...dxe4 ep
        • 2.Se4#
      • 1...Sf5
        • 2.e5#
      • 1...d3
        • 2.Sxa4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • R(d);N_GUARD::QAB(C),XP(c)
    • R(d);N_GUARD::QAB1(C),XP(f)
    • P(c);N_PINS(F)::B(A)+S(F),DCHECK
  • Tries
    • Try
      • Q(C);N_SPINS(F)
      • Threat
        • DUALS(3)
      • Vars
        • P(c);XQ(C)::B(A)+S(F),DCHECK
      • Refutation
        • B(i);XR(G)
  • Actual
    • P(D);
    • Threat
      • QAB(C),XP(c)
    • Vars
      • R(d);N_GUARD,XP(D)::QAB1(C),XP(f)
      • P(c);P_SPINP(c),XS(F)::QAB(C)
      • P(c);EP,N_PINS(F),XP(D)::B(A)+S(F),DCHECK
      • S(e);N_SPINR(a),SBLOCK::P(D)
      • P(c);N_PINS(F)::B(A)+S(F),XS(b)
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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).