MESON Chess Problem Database

Problem Display
PID: 10816 (8/Q7/8/2p5/8/1n1R2pR/4PNKp/3Bk3 w - - 0 1)

Ling, John Francis

The Problemist, 1968

8/Q7/8/2p5/8/1n1R2pR/4PNKp/3Bk3

#2

7 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Sa1
      • 2.Qa5#
    • 1...Sc1
      • 2.Qa5#
    • 1...Sd4
      • 2.Qa5#
    • 1...Sa5
      • 2.Qxa5#
    • 1...h1Q+
      • 2.Rxh1#
    • 1...h1S
      • 2.Rxh1#
    • 1...h1B+
      • 2.Rxh1#
    • 1...h1R
      • 2.Rxh1#
  • Tries
    • 1.Qa5+?
      • 1...Sd2
        • 2.Qxd2#
      • 1...Sxa5!
  • Keys
    • 1.e4!
      • 1...h1Q+
        • 2.Rxh1#
      • 1...h1B+
        • 2.Rxh1#
      • 1...gxf2
        • 2.Rhe3#
      • 1...h1S
        • 2.Rxh1#
      • 1...h1R
        • 2.Rxh1#
      • 1...c4
        • 2.Qe3#
      • 1...Sa1
        • 2.Qa5#
      • 1...Sc1
        • 2.Qa5#
      • 1...Sd2
        • 2.Re3#
      • 1...Sd4
        • 2.Qa5#
      • 1...Sa5
        • 2.Qxa5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD::QAB(G)
    • S(c);N_GUARD::QAB(G),XS(c)
    • P(b);CHECK,OGATE::R(F),XQ(b)
    • P(b);OGATE::R(F),XS(b)
    • P(b);CHECK,OGATE::R(F),XB(b)
    • P(b);OGATE::R(F),XR(b)
  • Tries
    • Try
      • Q(G);CHECK
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::QAB1(G),XS(c)
      • Refutation
        • S(c);XQ(G)
  • Actual
    • P(B);
    • Vars
      • P(b);CHECK,OGATE::R(F),XQ(b)
      • P(b);CHECK,OGATE::R(F),XB(b)
      • P(d);OGATE,XS(C)::R(F)
      • P(b);OGATE::R(F),XS(b)
      • P(b);OGATE::R(F),XR(b)
      • P(e);OGATE::QAR2(G)
      • S(c);N_GUARD::QAB(G)
      • S(c);SBLOCK::R(E)
      • S(c);N_GUARD::QAB(G),XS(c)
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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).