MESON Chess Problem Database

Problem Display
PID: 57357 (Q7/N2nn2b/p2p1p1q/R1Pr3p/2k1p3/PR6/K2p3b/BN3r2 w - - 0 1)

Ellerman, Arnoldo

4th HM., Brisbane Courier, 1920

Q7/N2nn2b/p2p1p1q/R1Pr3p/2k1p3/PR6/K2p3b/BN3r2

#2

9 + 14

SOLUTION

  • SOUND
  • Sets
    • 1...Rd3
      • 2.Rb4#
    • 1...Rd4
      • 2.Rc3#
    • 1...Rxc5
      • 2.Ra4#
    • 1...Rf5
      • 2.Qxe4#
    • 1...Rg5
      • 2.Sxd2#
    • 1...dxc5
      • 2.Ra4#
  • Tries
    • 1.Qb7?
      • threat
        • 2.Qxa6#
        • 2.Qb4#
      • 1...Rxc5
        • 2.Ra4#
      • 1...Sxc5
        • 2.Qb4#
      • 1...dxc5
        • 2.Ra4#
        • 2.Qxa6#
      • 1...Rd3
        • 2.Rb4#
      • 1...Rd4
        • 2.Rc3#
      • 1...Rdf5
        • 2.Qxe4#
      • 1...Rg5
        • 2.Sxd2#
      • 1...Sb6
        • 2.Qxa6#
      • 1...Sb8
        • 2.Qb4#
      • 1...Sc6
        • 2.Qxa6#
      • 1...Re5!
  • Keys
    • 1.Sc8!
      • threat
        • 2.Qxa6#
      • 1...Rxc5
        • 2.Ra4#
      • 1...Sxc5
        • 2.Sb6#
      • 1...Rd3
        • 2.Rb4#
      • 1...Rd4
        • 2.Rc3#
      • 1...Re5
        • 2.Sxd6#
      • 1...Rdf5
        • 2.Qxe4#
      • 1...Rg5
        • 2.Sxd2#
      • 1...Sb8
        • 2.Sb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(f);SBLOCK::R1(E)
    • R(f);SBLOCK,XP(G)::R(F)
    • R(f);OGATE::QAR2(I),XP(e)
    • R(f);N_GUARD,S_CUTQ(k)::S(B),XP(b)
    • P(i);SBLOCK,XP(G)::R(F)
  • Tries
    • Try
      • Q(I);
      • Threat
        • DUALS(2)
      • Vars
        • R(f);SBLOCK,XP(G)::R(F)
        • S(l);XP(G)::QAR1(I)
        • R(f);SBLOCK::R1(E)
        • R(f);OGATE::QAR2(I),XP(e)
        • R(f);N_GUARD,S_CUTQ(k)::S(B),XP(b)
        • S(l);::QAB(I),XP(h)
        • S(l);::QAR1(I)
        • S(m);::QAB(I),XP(h)
      • Refutation
        • R(f);
  • Actual
    • S(H);
    • Threat
      • QAB(I),XP(h)
    • Vars
      • R(f);SBLOCK,XP(G)::R(F)
      • S(l);N_GUARD,XP(G)::S(H)
      • R(f);SBLOCK::R1(E)
      • R(f);N_GUARD,S_CUTB(c)::S(H),XP(i)
      • R(f);OGATE::QAR2(I),XP(e)
      • R(f);N_GUARD,S_CUTQ(k)::S(B),XP(b)
      • S(l);N_GUARD::S(H)
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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).