MESON Chess Problem Database

Problem Display
PID: 271081 (2k2Nn1/K1P4p/p5p1/1b3q1r/8/Q6B/2R4B/8 w - - 0 1)

Otto, Max

Probleemblad, 1951

2k2Nn1/K1P4p/p5p1/1b3q1r/8/Q6B/2R4B/8

#2

7 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Bd7
      • 2.Qxa6#
    • 1...Be8
      • 2.Qxa6#
  • Tries
    • 1.Qd6?
      • threat
        • 2.Qd8#
      • 1...Bd7
        • 2.Qxa6#
      • 1...Qd7!
  • Keys
    • 1.Sd7!
      • threat
        • 2.Sb6#
      • 1...Kxd7
        • 2.c8Q#
      • 1...Qxd7
        • 2.Qf8#
      • 1...Bxd7
        • 2.Qxa6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • B(a);N_GUARD,N_SPINQ(b)::QAB(C),XP(d)
    • B(a);N_GUARD::QAB(C),XP(d)
  • Tries
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • B(a);N_GUARD,N_SPINQ(b)::QAB(C),XP(d)
      • Refutation
        • Q(b);P_PINP(F)
  • Actual
    • S(G);N_PINQ(b)
    • Threat
      • S(G)
    • Vars
      • K(g);OGATE,P_SPINQ(b),S_FLIGHT,XS(G)::P=Q
      • Q(b);N_GUARD,P_PINP(F),P_SPINQ(b),XS(G)::QAR(C)
      • B(a);N_GUARD,SBLOCK,XS(G)::QAB(C),XP(d)
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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).