MESON Chess Problem Database

Problem Display
PID: 80424 (1K6/8/1p6/1p6/1N4Q1/2RN4/2P5/kn4qR w - - 0 1)

Ellerman, Arnoldo

Good Companions Meredith Ty., 1924

1K6/8/1p6/1p6/1N4Q1/2RN4/2P5/kn4qR

#2

7 + 5

3391 Het Half Pin Thema 1924

SOLUTION

  • SOUND
  • Sets
    • 1...Qf2
      • 2.Ra3#
    • 1...Qe3
      • 2.Ra3#
    • 1...Qd4
      • 2.Ra3#
    • 1...Qc5
      • 2.Ra3#
    • 1...Qg2
      • 2.Ra3#
    • 1...Qxg4
      • 2.Ra3#
  • Keys
    • 1.Qd4!
      • threat
        • 2.Ra3#
      • 1...Qh2+
        • 2.Rc7#
      • 1...Qg3+
        • 2.Rc7#
      • 1...Qg8+
        • 2.Rc8#
      • 1...Sxc3
        • 2.Rxg1#
      • 1...Sd2
        • 2.Rb3#
      • 1...Sa3
        • 2.Rb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 6
  • Sets
    • Q(c);P_SPINS(b)::R(C)
    • Q(c);P_SPINS(b),XQ(F)::R(C)
  • Actual
    • Q(F);
    • Threat
      • QAB(F)+R(C),DCHECK
    • Vars
      • Q(c);CHECK,N_GUARD,P_SPINS(b)::QAB(F)+R(C)
      • S(b);OGATEB,P_SPINQ(c),P_SPINS(b),XR(C)::R(A),XQ(c)
      • S(b);N_GUARD,P_SPINQ(c)::QAB(F)+R(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).