MESON Chess Problem Database

Problem Display
PID: 21322 (1bBr4/2PN4/1PR1p1p1/4pb2/2p1k1qQ/8/4N1p1/2BKR3 w - - 0 1)

Weenink, Henri Gerard Maria

Good Companions (December), 1918

1bBr4/2PN4/1PR1p1p1/4pb2/2p1k1qQ/8/4N1p1/2BKR3

#2

10 + 10

3132 The Good Companion Two-Mover 1922
16055 HGM Weenink (Euwe/Niemeijer/Rueb/Trotsenburg) 1932
136 Problem Observer 2012
14868 Pirnie Collection 2013
136 Problem Observer 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Kd3
      • 2.Sc5#
    • 1...Kf3
      • 2.Sg1#
  • Tries
    • 1.Rxc4+?
      • 1...Kd3
        • 2.Sxe5#
      • 1...Kf3
        • 2.Sg1#
      • 1...Kd5!
    • 1.Rd6?
      • threat
        • 2.Bb7#
      • 1...Kf3
        • 2.Sg1#
      • 1...Rxc8!
    • 1.Qxg4+?
      • 1...Kd3
        • 2.Sc5#
        • 2.Sxe5#
        • 2.Rd6#
        • 2.Qf3#
        • 2.Qxc4#
      • 1...Kd5
        • 2.Qxc4#
      • 1...Bxg4!
  • Keys
    • 1.Bb7!
      • threat
        • 2.Rd6#
      • 1...Kd3
        • 2.Sc5#
      • 1...Kf3
        • 2.Sg1#
      • 1...Kd5
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(c);N_SPINQ(d),S_FLIGHT::S(I)
    • K(c);N_PINS(D),N_SPINQ(d),P_PINS(I),S_FLIGHT::S(D)
  • Tries
    • Try
      • R(G);CHECK,XP(b)
      • Vars
        • K(c);N_SPINQ(d),S_FLIGHT::S(I),XP(e)
        • K(c);N_PINS(D),N_SPINQ(d),P_PINS(I),S_FLIGHT::S(D)
      • Refutation
        • K(c);N_SPINQ(d),S_FLIGHT
    • Try
      • R(G);
      • Threat
        • B(J)
      • Vars
        • K(c);N_PINS(D),N_SPINQ(d),S_FLIGHT::S(D)
      • Refutation
        • R(j);XB(J)
    • Try
      • Q(E);CHECK,N_SPINS(D),P_SPINS(I),XQ(d)
      • Vars
        • K(c);N_PINS(I),OGATE,S_FLIGHT::QAB1(E),XP(b)
      • Refutation
        • B(f);N_PINS(I),P_PINS(D),XQ(E)
  • Actual
    • B(J);
    • Threat
      • B(J)+R(G)
    • Vars
      • K(c);N_SPINQ(d),S_FLIGHT::S(I)
      • K(c);N_PINS(D),N_SPINQ(d),P_PINS(I),S_FLIGHT::S(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).