MESON Chess Problem Database

Problem Display
PID: 505 (1B1R4/2N1p2b/KQ1b2qn/2P1k1P1/4pR2/p3p1P1/B2NP3/8 w - - 0 1)

Nicklin, John Joseph

The Observer, 1957

1B1R4/2N1p2b/KQ1b2qn/2P1k1P1/4pR2/p3p1P1/B2NP3/8

#2

12 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Bxc5
      • 2.Sc4#
      • 2.Rd5#
    • 1...Bxc7
      • 2.Sc4#
      • 2.Rd5#
    • 1...Sf5
      • 2.Rxe4#
    • 1...e6
      • 2.Qxd6#
  • Keys
    • 1.Qa5!
      • threat
        • 2.Qc3#
      • 1...Bxc5+
        • 2.Se6#
      • 1...Bxc7+
        • 2.c6#
      • 1...Kd4
        • 2.Sf3#
      • 1...Sf5
        • 2.Rxe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • S(g);SBLOCK,S_CUTQ(f)::R1(E),XP(c)
    • P(h);N_GUARD,S_CUTQ(f)::QAB1(I),XB(e)
  • Actual
    • Q(I);
    • Threat
      • QAB(I)
    • Vars
      • B(e);CHECK,P_SPINB(e),XP(F)::B(K)+S(J)
      • B(e);CHECK,N_GUARD,P_SPINB(e),XS(J)::QAR(I)+P(F)
      • K(d);P_SPINB(e),P_SPINP(c),S_FLIGHT::S(B)
      • S(g);SBLOCK,S_CUTQ(f)::R1(E),XP(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).