MESON Chess Problem Database

Problem Display
PID: 16837 (8/R1R1b3/3qr3/3pp3/Pk6/4NQ2/2B5/1N1K4 w - - 0 1)

Gray, Robert

The Chess Problem, 1943

8/R1R1b3/3qr3/3pp3/Pk6/4NQ2/2B5/1N1K4

#2

8 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Qb6
      • 2.Sxd5#
    • 1...d4
      • 2.Rc4#
  • Tries
    • 1.Qe4+?
      • 1...d4
        • 2.Rc4#
      • 1...dxe4+!
    • 1.Qg4+?
      • 1...d4
        • 2.Rc4#
      • 1...e4!
  • Keys
    • 1.Qxd5!
      • threat
        • 2.Rc4#
      • 1...Qxd5+
        • 2.Sxd5#
      • 1...Qxc7
        • 2.Qb5#
      • 1...Qc5
        • 2.Qb3#
      • 1...Qa6
        • 2.Qd2#
      • 1...Qc6
        • 2.Qa5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • Q(d);N_GUARD::S(D),XP(b)
    • P(b);N_GUARD::R1(H)
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • P(b);N_GUARD,P_SPINP(b)::R1(H)
      • Refutation
        • P(b);CHECK,XQ(E)
    • Try
      • Q(E);CHECK
      • Vars
        • P(b);N_GUARD,P_SPINP(b)::R1(H)
      • Refutation
        • P(c);P_SPINP(c)
  • Actual
    • Q(E);P_SPINQ(E),XP(b)
    • Threat
      • R1(H)
    • Vars
      • Q(d);CHECK,XQ(E)::S(D),XQ(d)
      • Q(d);N_PINQ(E),XR(H)::QAR1(E)
      • Q(d);N_PINQ(E)::QAR1(E)
      • Q(d);N_GUARD,N_PINQ(E)::QAB(E)
      • Q(d);N_PINQ(E)::QAB1(E)
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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).