MESON Chess Problem Database

Problem Display
PID: 459 (5n2/1Q5R/6R1/4P2q/1K4PN/4PNkP/6P1/6B1 w - - 0 1)

Brill, Robert C

The Observer, 1956

5n2/1Q5R/6R1/4P2q/1K4PN/4PNkP/6P1/6B1

#2

12 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Qxg4+
      • 2.Rxg4#
    • 1...Sd7
      • 2.gxh5#
  • Keys
    • 1.Sg5!
      • threat
        • 2.Sf5#
      • 1...Qxg4+
        • 2.Se4#
      • 1...Kxh4
        • 2.Bf2#
      • 1...Qxg6
        • 2.Qf3#
      • 1...Qxh4
        • 2.Qf3#
      • 1...Qxg5
        • 2.Qf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • Q(b);CHECK,OGATE,P_SPINQ(b),XP(G)::R1(J),XQ(b)
    • S(c);N_GUARD::R(J)+P(G),XQ(b)
  • Actual
    • S(D);
    • Threat
      • S(H)
    • Vars
      • Q(b);CHECK,XP(G)::S(D)
      • K(a);P_SPINQ(b),S_FLIGHT,XS(H)::B(A)
      • Q(b);XR(J)::QAR1(K)
      • Q(b);P_PINP(G),XS(H)::QAR1(K)
      • Q(b);XS(D)::QAR1(K)
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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).