MESON Chess Problem Database

Problem Display
PID: 21953 (8/1p2N1NK/p6R/P1krrQ2/8/1p2P3/2qB3b/1bR2B2 w - - 0 1)

Ellerman, Arnoldo

Good Companions (October), 1922

8/1p2N1NK/p6R/P1krrQ2/8/1p2P3/2qB3b/1bR2B2

#2

10 + 9

3132 The Good Companion Two-Mover 1922
5137 1001 Problemas 1945
3979 Systematic Terminology 1984

SOLUTION

  • SOUND
  • Sets
    • 1...Re4
      • 2.Qxd5#
    • 1...b5
      • 2.Rc6#
    • 1...b6
      • 2.Rc6#
  • Tries
    • 1.Rxc2+?
      • 1...bxc2
        • 2.Qc8#
      • 1...Bxc2!
  • Keys
    • 1.Rb6!
      • threat
        • 2.Bb4#
      • 1...Rxd2
        • 2.Se6#
      • 1...Rxe3
        • 2.Bxe3#
      • 1...Rd3
        • 2.Qc8#
      • 1...Qc3
        • 2.Rxc3#
      • 1...Rd4
        • 2.Se6#
      • 1...Re4
        • 2.Qxd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • R(g);N_PINQ(F),P_SPINR(f)::QAR1(F),XR(f)
    • P(i);N_GUARD::R1(G)
  • Tries
    • Try
      • R(A);CHECK,N_SPINQ(F),XQ(b)
      • Vars
        • P(d);XR(A)::QAR(F)
      • Refutation
        • B(a);P_PINQ(F),XR(A)
  • Actual
    • R(G);
    • Threat
      • B(C)
    • Vars
      • R(f);P_SPINR(g),XB(C)::S(I)
      • R(g);OGATE,P_SPINR(f),XP(D)::B(C),XR(g)
      • R(f);N_PINQ(F),P_SPINR(g)::QAR(F)
      • Q(b);OGATE::R(A),XQ(b)
      • R(f);P_SPINR(g)::S(I)
      • R(g);N_PINQ(F),P_SPINR(f)::QAR1(F),XR(f)
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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).