MESON Chess Problem Database

Problem Display
PID: 60102 (1N1N4/1r3p2/B4p1K/P1k5/b2R1R2/r1p4p/p1p5/Qq6 w - - 0 1)

Popp, Willy

3rd Prize, Osterreichische Arbeiter Schachbund, 1928

1N1N4/1r3p2/B4p1K/P1k5/b2R1R2/r1p4p/p1p5/Qq6

#2

8 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa1
      • 2.Sxb7#
    • 1...Qc1
      • 2.Sxb7#
    • 1...Qd1
      • 2.Sxb7#
    • 1...Qe1
      • 2.Sxb7#
    • 1...Qf1
      • 2.Sxb7#
    • 1...Qg1
      • 2.Sxb7#
    • 1...Rb5
      • 2.Sd7#
    • 1...Bb3
      • 2.Sxb7#
    • 1...Bb5
      • 2.Sxb7#
  • Keys
    • 1.Rd2!
      • threat
        • 2.Rc4#
      • 1...cxd2
        • 2.Qd4#
      • 1...Qb5
        • 2.Qg1#
      • 1...Qf1
        • 2.Sxb7#
      • 1...Qb3
        • 2.Qg1#
      • 1...Qb4
        • 2.Rf5#
      • 1...Rb4
        • 2.Rf5#
      • 1...Rb5
        • 2.Sd7#
      • 1...Bb3
        • 2.Sxb7#
      • 1...Bb5
        • 2.Sxb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 5
  • Sets
    • Q(a);N_GUARD,XQ(A)::S(H),XR(j)
    • Q(a);N_GUARD,P_PINR(C)::S(H),XR(j)
    • Q(a);N_GUARD::S(H),XR(j)
    • R(j);N_GUARD,S_CUTB(g)::S(G)
    • B(g);S_CUTQ(a)::S(H),XR(j)
  • Actual
    • R(B);
    • Threat
      • R1(C)
    • Vars
      • P(e);OGATE,XR(B)::QAB1(A)
      • Q(a);OGATE::QAB(A)
      • Q(a);N_GUARD::S(H),XR(j)
      • Q(a);SBLOCK::R(C)
      • R(j);SBLOCK::R(C)
      • R(j);N_GUARD,S_CUTB(g)::S(G)
      • B(g);S_CUTQ(a)::S(H),XR(j)
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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).