MESON Chess Problem Database

Problem Display
PID: 170856 (8/1B6/6r1/5N2/8/4QP2/8/5K1k w - - 0 1)

Lincoln, Robert A

StrateGems, 2017

8/1B6/6r1/5N2/8/4QP2/8/5K1k

#2

5 + 2

SOLUTION

  • SOUND
  • Sets
    • 1...Rg1+
      • 2.Qxg1#
    • 1...Ra6
      • 2.Qg1#
    • 1...Rb6
      • 2.Qg1#
    • 1...Rc6
      • 2.Qg1#
    • 1...Rd6
      • 2.Qg1#
    • 1...Re6
      • 2.Qg1#
    • 1...Rf6
      • 2.Qg1#
    • 1...Rh6
      • 2.Qg1#
      • 2.Qxh6#
    • 1...Rg7
      • 2.Qh6#
    • 1...Rg8
      • 2.Qh6#
  • Tries
    • 1.Qg5?
      • threat
        • 2.Qh4#
        • 2.Qh5#
      • 1...Kh2
        • 2.Qh4#
        • 2.Qh5#
      • 1...Rh6
        • 2.Qxh6#
        • 2.Qg1#
        • 2.Qg2#
      • 1...Rxg5!
    • 1.f4+?
      • 1...Rg2
        • 2.Qg1#
        • 2.Qh3#
      • 1...Rc6
        • 2.Qg1#
        • 2.Qh3#
      • 1...Kh2!
  • Keys
    • 1.Qf2!
      • threat
        • 2.Qh4#
      • 1...Rg1+
        • 2.Qxg1#
      • 1...Rg2
        • 2.Qxg2#
      • 1...Rg3
        • 2.Sxg3#
      • 1...Rg4
        • 2.fxg4#
      • 1...Rh6
        • 2.Sg3#
        • 2.Qg1#
        • 2.Qg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • R(b);CHECK,N_GUARD::QAR1(B),XR(b)
    • R(b);N_GUARD::QAR1(B)
    • R(b);N_GUARD::QAR(B)
  • Tries
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Refutation
        • R(b);XQ(B)
    • Try
      • P(C);CHECK
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(B);
    • Threat
      • QAR(B)
    • Vars
      • R(b);CHECK,N_GUARD::QAR1(B),XR(b)
      • R(b);N_GUARD::QAB1(B),XR(b)
      • R(b);N_GUARD::S(D),XR(b)
      • R(b);OGATE::B(E)+P(C),XR(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).