MESON Chess Problem Database

Problem Display
PID: 17931 (4K1B1/1p4Pr/1PkN1Rp1/B6p/b2pN3/1pp2P2/5r2/2Rq3Q w - - 0 1)

McWilliam, Robert C

1st Comm., BCF, 1952

4K1B1/1p4Pr/1PkN1Rp1/B6p/b2pN3/1pp2P2/5r2/2Rq3Q

#2

11 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Bb5
      • 2.Sc4#
      • 2.Sf5#
      • 2.Sc8#
    • 1...d3
      • 2.Rxc3#
  • Tries
    • 1.Bc4?
      • threat
        • 2.Sb5#
        • 2.Sf5#
        • 2.Sf7#
        • 2.Sc8#
      • 1...Qxf3
        • 2.Sf5#
      • 1...Rxf3
        • 2.Sf5#
      • 1...Bb5
        • 2.Sxb5#
        • 2.Sf5#
        • 2.Sf7#
        • 2.Sc8#
      • 1...Rh8+!
    • 1.Rf5?
      • threat
        • 2.Bd5#
        • 2.Rc5#
      • 1...Rh8
        • 2.Rc5#
      • 1...gxf5!
  • Keys
    • 1.Sxc3!
      • threat
        • 2.Sde4#
      • 1...Kc5+
        • 2.Sxa4#
      • 1...Qxf3
        • 2.Se2#
      • 1...Rxf3
        • 2.Sxd1#
      • 1...dxc3
        • 2.Rxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • P(f);N_GUARD::R(A),XP(d)
  • Tries
    • Try
      • B(K);N_PINP(d)
      • Threat
        • DUALS(4)
      • Vars
        • Q(a);XP(C)::R(H)+S(G)
        • R(b);XP(C)::R(H)+S(G)
      • Refutation
        • R(k);CHECK
    • Try
      • R(H);
      • Threat
        • DUALS(2)
      • Vars
        • R(k);P_PINB(K)::R1(H)
      • Refutation
        • P(i);XR(H)
  • Actual
    • S(D);XP(d)
    • Threat
      • R(H)+S(G)
    • Vars
      • K(h);CHECK,P-FLIGHT::R(A)+S(D),DCHECK,XB(e)
      • Q(a);N_GUARD,P_SPINQ(a),XP(C)::R(A)+S(D)
      • R(b);N_GUARD,P_SPINR(b),XP(C)::R(A)+S(D),XQ(a)
      • P(f);OGATE,P_SPINP(f),XS(D)::R(A),XP(f)
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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).