MESON Chess Problem Database

Problem Display
PID: 210876 (8/7R/4Rq1b/4pb2/4p1p1/2Q3P1/1NN1kP2/4B1K1 w - - 0 1)

Sprey, A Malcolm

The Problemist, 1985

8/7R/4Rq1b/4pb2/4p1p1/2Q3P1/1NN1kP2/4B1K1

#2

9 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Be3
      • 2.Qxe3#
    • 1...Bg7
      • 2.Qe3#
    • 1...Bf8
      • 2.Qe3#
  • Tries
    • 1.Qd2+?
      • 1...Kf3
        • 2.Qd1#
      • 1...Bxd2!
  • Keys
    • 1.f4!
      • threat
        • 2.Qe3#
      • 1...Bxf4
        • 2.Rh2#
      • 1...exf4
        • 2.Qd3#
      • 1...exf4 ep
        • 2.Sd4#
      • 1...gxf4 ep
        • 2.Qc4#
      • 1...e3
        • 2.Qxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 3
  • Sets
    • B(g);N_GUARD,P_PINP(E)::QAR1(F),XB(g)
    • B(g);N_GUARD::QAR1(F)
  • Tries
    • Try
      • Q(F);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB(F)
      • Refutation
        • B(g);XQ(F)
  • Actual
    • P(E);
    • Threat
      • QAR1(F)
    • Vars
      • B(g);OGATE,XP(E)::R(I)
      • P(d);P_SPINP(b),XP(E)::QAB1(F)
      • P(b);EP,P_SPINP(d),XP(E)::S(D)
      • P(c);EP,XP(E)::QAB(F)
      • P(b);::QAR1(F),XP(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).