MESON Chess Problem Database

Problem Display
PID: 21952 (K1B2RN1/1Q3Npr/2pp1bk1/7p/1p3n1p/8/6b1/6R1 w - - 0 1)

Ellerman, Arnoldo

2nd Prize, Good Companions (May), 1922

K1B2RN1/1Q3Npr/2pp1bk1/7p/1p3n1p/8/6b1/6R1

#2

7 + 11

3132 The Good Companion Two-Mover 1922
3391 Het Half Pin Thema 1924
5137 1001 Problemas 1945
5395 Schach fur Nussknacker 1994

SOLUTION

  • SOUND
  • Sets
    • 1...c5
      • 2.Qe4#
  • Tries
    • 1.Rxg2+?
      • 1...Bg5
        • 2.Rxg5#
      • 1...Sxg2!
  • Keys
    • 1.Qxc6!
      • threat
        • 2.Qe4#
      • 1...Bg5
        • 2.Se5#
      • 1...Sd5
        • 2.Qc2#
      • 1...d5
        • 2.Se7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • P(f);OGATE,P_PINQ(B)::QAB(B)
  • Tries
    • Try
      • R(A);CHECK,XB(a)
      • Vars
        • B(h);N_GUARD,P_SPINB(h)::R1(A),XB(h)
      • Refutation
        • S(c);XR(A)
  • Actual
    • Q(B);P_SPINQ(B),XP(f)
    • Threat
      • QAB(B)
    • Vars
      • B(h);N_GUARD,N_SPINB(a),P_SPINP(g),SBLOCK::S(C)
      • S(c);N_PINQ(B)::QAB(B)
      • P(g);N_PINQ(B),S_CUTB(h)::S(G)
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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).