MESON Chess Problem Database

Problem Display
PID: 21520 (2bb3r/1RqpkPpn/4P3/2R5/QBK1N2N/8/8/8 w - - 0 1)

Janet, Frank

2nd HM., Good Companions (May), 1919

2bb3r/1RqpkPpn/4P3/2R5/QBK1N2N/8/8/8

#2

9 + 8

3132 The Good Companion Two-Mover 1922
3391 Het Half Pin Thema 1924

SOLUTION

  • SOUND
  • Sets
    • 1...Kf8
      • 2.Sg6#
    • 1...Qh2
      • 2.Re5#
    • 1...Qg3
      • 2.Re5#
    • 1...Qf4
      • 2.Re5#
    • 1...Qe5
      • 2.Rxe5#
    • 1...Qc6
      • 2.Rxc6#
    • 1...dxe6
      • 2.Rcxc7#
  • Tries
    • 1.Qxd7+?
      • 1...Kf8
        • 2.Sg6#
        • 2.Qe8#
      • 1...Qxd7
        • 2.Re5#
        • 2.Rc6#
      • 1...Bxd7!
  • Keys
    • 1.Qc6!
      • threat
        • 2.Sg6#
      • 1...d5+
        • 2.Rxd5#
      • 1...Kf8
        • 2.Sg6#
      • 1...Qxc6
        • 2.Rxc6#
      • 1...dxc6
        • 2.Rxc6#
      • 1...dxe6
        • 2.Rf5#
      • 1...Qd6
        • 2.Qxd6#
      • 1...d6
        • 2.Qxd6#
      • 1...Qg3
        • 2.Re5#
      • 1...Sf8
        • 2.Sf5#
      • 1...g6
        • 2.Sxg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 3
  • Sets
    • K(c);S_FLIGHT::S(E)
    • Q(a);N_PINR(F),P_SPINP(b)::B(B)+R(F)
    • Q(a);N_PINR(F),P_PINS(D),P_SPINP(b)::B(B)+R(F)
    • Q(a);N_PINR(F),P_SPINP(b)::B(B)+R(F),XQ(a)
    • Q(a);N_GUARD,P_SPINP(b)::B(B)+R(F),XQ(a)
    • P(b);P_SPINQ(a),SBLOCK,XP(G)::B(B)+R(F),DCHECK,XQ(a)
  • Tries
    • Try
      • Q(A);CHECK,XP(b)
      • Refutation
        • B(f);XQ(A)
  • Actual
    • Q(A);N_SPINR(F)
    • Threat
      • S(E)
    • Vars
      • P(b);CHECK,N_GUARD,P_SPINQ(a)::B(B)+R(F),XP(b)
      • K(c);S_FLIGHT::S(E)
      • Q(a);OGATE,P_PINR(F),P_SPINP(b),XQ(A)::B(B)+R(F),XQ(a)
      • P(b);OGATE,P_SPINQ(a),XQ(A)::B(B)+R(F),XP(b)
      • P(b);N_GUARD,P_SPINQ(a),XP(G)::B(B)+R(F)
      • Q(a);N_GUARD,P_SPINP(b)::QAB1(A),XQ(a)
      • P(b);P_SPINQ(a)::QAB1(A),XP(b)
      • Q(a);N_GUARD,P_SPINP(b)::B(B)+R(F)
      • S(e);SBLOCK::S(E)
      • P(d);::S(E),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).